/usr/share/doc/libghc-text-doc/html/src/Data-Text.html is in libghc-text-doc 0.11.1.13-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 | <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<!-- Generated by HsColour, http://code.haskell.org/~malcolm/hscolour/ -->
<title>Data/Text.hs</title>
<link type='text/css' rel='stylesheet' href='hscolour.css' />
</head>
<body>
<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE BangPatterns, CPP, Rank2Types, UnboxedTuples #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# OPTIONS_GHC -fno-warn-orphans #-}</span>
<a name="line-3"></a>
<a name="line-4"></a><span class='hs-comment'>-- |</span>
<a name="line-5"></a><span class='hs-comment'>-- Module : Data.Text</span>
<a name="line-6"></a><span class='hs-comment'>-- Copyright : (c) 2009, 2010, 2011 Bryan O'Sullivan,</span>
<a name="line-7"></a><span class='hs-comment'>-- (c) 2009 Duncan Coutts,</span>
<a name="line-8"></a><span class='hs-comment'>-- (c) 2008, 2009 Tom Harper</span>
<a name="line-9"></a><span class='hs-comment'>--</span>
<a name="line-10"></a><span class='hs-comment'>-- License : BSD-style</span>
<a name="line-11"></a><span class='hs-comment'>-- Maintainer : bos@serpentine.com, rtomharper@googlemail.com,</span>
<a name="line-12"></a><span class='hs-comment'>-- duncan@haskell.org</span>
<a name="line-13"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-14"></a><span class='hs-comment'>-- Portability : GHC</span>
<a name="line-15"></a><span class='hs-comment'>--</span>
<a name="line-16"></a><span class='hs-comment'>-- A time and space-efficient implementation of Unicode text.</span>
<a name="line-17"></a><span class='hs-comment'>-- Suitable for performance critical use, both in terms of large data</span>
<a name="line-18"></a><span class='hs-comment'>-- quantities and high speed.</span>
<a name="line-19"></a><span class='hs-comment'>--</span>
<a name="line-20"></a><span class='hs-comment'>-- /Note/: Read below the synopsis for important notes on the use of</span>
<a name="line-21"></a><span class='hs-comment'>-- this module.</span>
<a name="line-22"></a><span class='hs-comment'>--</span>
<a name="line-23"></a><span class='hs-comment'>-- This module is intended to be imported @qualified@, to avoid name</span>
<a name="line-24"></a><span class='hs-comment'>-- clashes with "Prelude" functions, e.g.</span>
<a name="line-25"></a><span class='hs-comment'>--</span>
<a name="line-26"></a><span class='hs-comment'>-- > import qualified Data.Text as T</span>
<a name="line-27"></a><span class='hs-comment'>--</span>
<a name="line-28"></a><span class='hs-comment'>-- To use an extended and very rich family of functions for working</span>
<a name="line-29"></a><span class='hs-comment'>-- with Unicode text (including normalization, regular expressions,</span>
<a name="line-30"></a><span class='hs-comment'>-- non-standard encodings, text breaking, and locales), see the</span>
<a name="line-31"></a><span class='hs-comment'>-- @text-icu@ package: <<a href="http://hackage.haskell.org/package/text-icu">http://hackage.haskell.org/package/text-icu</a>></span>
<a name="line-32"></a>
<a name="line-33"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span>
<a name="line-34"></a> <span class='hs-layout'>(</span>
<a name="line-35"></a> <span class='hs-comment'>-- * Strict vs lazy types</span>
<a name="line-36"></a> <span class='hs-comment'>-- $strict</span>
<a name="line-37"></a>
<a name="line-38"></a> <span class='hs-comment'>-- * Acceptable data</span>
<a name="line-39"></a> <span class='hs-comment'>-- $replacement</span>
<a name="line-40"></a>
<a name="line-41"></a> <span class='hs-comment'>-- * Fusion</span>
<a name="line-42"></a> <span class='hs-comment'>-- $fusion</span>
<a name="line-43"></a>
<a name="line-44"></a> <span class='hs-comment'>-- * Types</span>
<a name="line-45"></a> <span class='hs-conid'>Text</span>
<a name="line-46"></a>
<a name="line-47"></a> <span class='hs-comment'>-- * Creation and elimination</span>
<a name="line-48"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>pack</span>
<a name="line-49"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unpack</span>
<a name="line-50"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>singleton</span>
<a name="line-51"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>empty</span>
<a name="line-52"></a>
<a name="line-53"></a> <span class='hs-comment'>-- * Basic interface</span>
<a name="line-54"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>cons</span>
<a name="line-55"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>snoc</span>
<a name="line-56"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>append</span>
<a name="line-57"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>uncons</span>
<a name="line-58"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>head</span>
<a name="line-59"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>last</span>
<a name="line-60"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>tail</span>
<a name="line-61"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>init</span>
<a name="line-62"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>null</span>
<a name="line-63"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>length</span>
<a name="line-64"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>compareLength</span>
<a name="line-65"></a>
<a name="line-66"></a> <span class='hs-comment'>-- * Transformations</span>
<a name="line-67"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>map</span>
<a name="line-68"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>intercalate</span>
<a name="line-69"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>intersperse</span>
<a name="line-70"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>transpose</span>
<a name="line-71"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>reverse</span>
<a name="line-72"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>replace</span>
<a name="line-73"></a>
<a name="line-74"></a> <span class='hs-comment'>-- ** Case conversion</span>
<a name="line-75"></a> <span class='hs-comment'>-- $case</span>
<a name="line-76"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>toCaseFold</span>
<a name="line-77"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>toLower</span>
<a name="line-78"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>toUpper</span>
<a name="line-79"></a>
<a name="line-80"></a> <span class='hs-comment'>-- ** Justification</span>
<a name="line-81"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>justifyLeft</span>
<a name="line-82"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>justifyRight</span>
<a name="line-83"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>center</span>
<a name="line-84"></a>
<a name="line-85"></a> <span class='hs-comment'>-- * Folds</span>
<a name="line-86"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>foldl</span>
<a name="line-87"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>foldl'</span>
<a name="line-88"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>foldl1</span>
<a name="line-89"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>foldl1'</span>
<a name="line-90"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>foldr</span>
<a name="line-91"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>foldr1</span>
<a name="line-92"></a>
<a name="line-93"></a> <span class='hs-comment'>-- ** Special folds</span>
<a name="line-94"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>concat</span>
<a name="line-95"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>concatMap</span>
<a name="line-96"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>any</span>
<a name="line-97"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>all</span>
<a name="line-98"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>maximum</span>
<a name="line-99"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>minimum</span>
<a name="line-100"></a>
<a name="line-101"></a> <span class='hs-comment'>-- * Construction</span>
<a name="line-102"></a>
<a name="line-103"></a> <span class='hs-comment'>-- ** Scans</span>
<a name="line-104"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>scanl</span>
<a name="line-105"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>scanl1</span>
<a name="line-106"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>scanr</span>
<a name="line-107"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>scanr1</span>
<a name="line-108"></a>
<a name="line-109"></a> <span class='hs-comment'>-- ** Accumulating maps</span>
<a name="line-110"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mapAccumL</span>
<a name="line-111"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mapAccumR</span>
<a name="line-112"></a>
<a name="line-113"></a> <span class='hs-comment'>-- ** Generation and unfolding</span>
<a name="line-114"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>replicate</span>
<a name="line-115"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unfoldr</span>
<a name="line-116"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unfoldrN</span>
<a name="line-117"></a>
<a name="line-118"></a> <span class='hs-comment'>-- * Substrings</span>
<a name="line-119"></a>
<a name="line-120"></a> <span class='hs-comment'>-- ** Breaking strings</span>
<a name="line-121"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>take</span>
<a name="line-122"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>drop</span>
<a name="line-123"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>takeWhile</span>
<a name="line-124"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>dropWhile</span>
<a name="line-125"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>dropWhileEnd</span>
<a name="line-126"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>dropAround</span>
<a name="line-127"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>strip</span>
<a name="line-128"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>stripStart</span>
<a name="line-129"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>stripEnd</span>
<a name="line-130"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>splitAt</span>
<a name="line-131"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>breakOn</span>
<a name="line-132"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>breakOnEnd</span>
<a name="line-133"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>break</span>
<a name="line-134"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>span</span>
<a name="line-135"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>group</span>
<a name="line-136"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>groupBy</span>
<a name="line-137"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>inits</span>
<a name="line-138"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>tails</span>
<a name="line-139"></a>
<a name="line-140"></a> <span class='hs-comment'>-- ** Breaking into many substrings</span>
<a name="line-141"></a> <span class='hs-comment'>-- $split</span>
<a name="line-142"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>splitOn</span>
<a name="line-143"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>split</span>
<a name="line-144"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>chunksOf</span>
<a name="line-145"></a>
<a name="line-146"></a> <span class='hs-comment'>-- ** Breaking into lines and words</span>
<a name="line-147"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>lines</span>
<a name="line-148"></a> <span class='hs-comment'>--, lines'</span>
<a name="line-149"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>words</span>
<a name="line-150"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unlines</span>
<a name="line-151"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unwords</span>
<a name="line-152"></a>
<a name="line-153"></a> <span class='hs-comment'>-- * Predicates</span>
<a name="line-154"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>isPrefixOf</span>
<a name="line-155"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>isSuffixOf</span>
<a name="line-156"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>isInfixOf</span>
<a name="line-157"></a>
<a name="line-158"></a> <span class='hs-comment'>-- ** View patterns</span>
<a name="line-159"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>stripPrefix</span>
<a name="line-160"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>stripSuffix</span>
<a name="line-161"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>commonPrefixes</span>
<a name="line-162"></a>
<a name="line-163"></a> <span class='hs-comment'>-- * Searching</span>
<a name="line-164"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>filter</span>
<a name="line-165"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>breakOnAll</span>
<a name="line-166"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>find</span>
<a name="line-167"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>partition</span>
<a name="line-168"></a>
<a name="line-169"></a> <span class='hs-comment'>-- , findSubstring</span>
<a name="line-170"></a>
<a name="line-171"></a> <span class='hs-comment'>-- * Indexing</span>
<a name="line-172"></a> <span class='hs-comment'>-- $index</span>
<a name="line-173"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>index</span>
<a name="line-174"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>findIndex</span>
<a name="line-175"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>count</span>
<a name="line-176"></a>
<a name="line-177"></a> <span class='hs-comment'>-- * Zipping and unzipping</span>
<a name="line-178"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>zip</span>
<a name="line-179"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>zipWith</span>
<a name="line-180"></a>
<a name="line-181"></a> <span class='hs-comment'>-- -* Ordered text</span>
<a name="line-182"></a> <span class='hs-comment'>-- , sort</span>
<a name="line-183"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-184"></a>
<a name="line-185"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Prelude</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span><span class='hs-layout'>,</span> <span class='hs-conid'>Bool</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-conid'>Maybe</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span><span class='hs-layout'>,</span>
<a name="line-186"></a> <span class='hs-conid'>Eq</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ord</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ordering</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-187"></a> <span class='hs-conid'>Read</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-188"></a> <span class='hs-layout'>(</span><span class='hs-varop'>&&</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>||</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>+</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>.</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>$</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>$!</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>>></span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>*</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-189"></a> <span class='hs-varid'>div</span><span class='hs-layout'>,</span> <span class='hs-varid'>maxBound</span><span class='hs-layout'>,</span> <span class='hs-varid'>not</span><span class='hs-layout'>,</span> <span class='hs-varid'>return</span><span class='hs-layout'>,</span> <span class='hs-varid'>otherwise</span><span class='hs-layout'>)</span>
<a name="line-190"></a><span class='hs-cpp'>#if defined(HAVE_DEEPSEQ)</span>
<a name="line-191"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>DeepSeq</span> <span class='hs-layout'>(</span><span class='hs-conid'>NFData</span><span class='hs-layout'>)</span>
<a name="line-192"></a><span class='hs-cpp'>#endif</span>
<a name="line-193"></a><span class='hs-cpp'>#if defined(ASSERTS)</span>
<a name="line-194"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-layout'>(</span><span class='hs-varid'>assert</span><span class='hs-layout'>)</span>
<a name="line-195"></a><span class='hs-cpp'>#endif</span>
<a name="line-196"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Char</span> <span class='hs-layout'>(</span><span class='hs-varid'>isSpace</span><span class='hs-layout'>)</span>
<a name="line-197"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Data</span> <span class='hs-layout'>(</span><span class='hs-conid'>Data</span><span class='hs-layout'>(</span><span class='hs-varid'>gfoldl</span><span class='hs-layout'>,</span> <span class='hs-varid'>toConstr</span><span class='hs-layout'>,</span> <span class='hs-varid'>gunfold</span><span class='hs-layout'>,</span> <span class='hs-varid'>dataTypeOf</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-198"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ >= 612</span>
<a name="line-199"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Data</span> <span class='hs-layout'>(</span><span class='hs-varid'>mkNoRepType</span><span class='hs-layout'>)</span>
<a name="line-200"></a><span class='hs-cpp'>#else</span>
<a name="line-201"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Data</span> <span class='hs-layout'>(</span><span class='hs-varid'>mkNorepType</span><span class='hs-layout'>)</span>
<a name="line-202"></a><span class='hs-cpp'>#endif</span>
<a name="line-203"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span> <span class='hs-layout'>(</span><span class='hs-varid'>foldM</span><span class='hs-layout'>)</span>
<a name="line-204"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Array</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>A</span>
<a name="line-205"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>L</span>
<a name="line-206"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Monoid</span> <span class='hs-layout'>(</span><span class='hs-conid'>Monoid</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-207"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>String</span> <span class='hs-layout'>(</span><span class='hs-conid'>IsString</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-208"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Fusion</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>S</span>
<a name="line-209"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Fusion</span><span class='hs-varop'>.</span><span class='hs-conid'>Common</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>S</span>
<a name="line-210"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Fusion</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span><span class='hs-layout'>,</span> <span class='hs-varid'>reverseStream</span><span class='hs-layout'>,</span> <span class='hs-varid'>unstream</span><span class='hs-layout'>)</span>
<a name="line-211"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Private</span> <span class='hs-layout'>(</span><span class='hs-varid'>span_</span><span class='hs-layout'>)</span>
<a name="line-212"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>empty</span><span class='hs-layout'>,</span> <span class='hs-varid'>firstf</span><span class='hs-layout'>,</span> <span class='hs-keyword'>safe</span><span class='hs-layout'>,</span> <span class='hs-varid'>text</span><span class='hs-layout'>,</span> <span class='hs-varid'>textP</span><span class='hs-layout'>)</span>
<a name="line-213"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Prelude</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>P</span>
<a name="line-214"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Unsafe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Iter</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>iter</span><span class='hs-layout'>,</span> <span class='hs-varid'>iter_</span><span class='hs-layout'>,</span> <span class='hs-varid'>lengthWord16</span><span class='hs-layout'>,</span> <span class='hs-varid'>reverseIter</span><span class='hs-layout'>,</span>
<a name="line-215"></a> <span class='hs-varid'>unsafeHead</span><span class='hs-layout'>,</span> <span class='hs-varid'>unsafeTail</span><span class='hs-layout'>)</span>
<a name="line-216"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>UnsafeChar</span> <span class='hs-layout'>(</span><span class='hs-varid'>unsafeChr</span><span class='hs-layout'>)</span>
<a name="line-217"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Util</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>U</span>
<a name="line-218"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Encoding</span><span class='hs-varop'>.</span><span class='hs-conid'>Utf16</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>U16</span>
<a name="line-219"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Search</span> <span class='hs-layout'>(</span><span class='hs-varid'>indices</span><span class='hs-layout'>)</span>
<a name="line-220"></a><span class='hs-cpp'>#if defined(__HADDOCK__)</span>
<a name="line-221"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span> <span class='hs-layout'>(</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>)</span>
<a name="line-222"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Lazy</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>L</span>
<a name="line-223"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Int</span> <span class='hs-layout'>(</span><span class='hs-conid'>Int64</span><span class='hs-layout'>)</span>
<a name="line-224"></a><span class='hs-cpp'>#endif</span>
<a name="line-225"></a>
<a name="line-226"></a><span class='hs-comment'>-- $strict</span>
<a name="line-227"></a><span class='hs-comment'>--</span>
<a name="line-228"></a><span class='hs-comment'>-- This package provides both strict and lazy 'Text' types. The</span>
<a name="line-229"></a><span class='hs-comment'>-- strict type is provided by the 'Data.Text' package, while the lazy</span>
<a name="line-230"></a><span class='hs-comment'>-- type is provided by the 'Data.Text.Lazy' package. Internally, the</span>
<a name="line-231"></a><span class='hs-comment'>-- lazy @Text@ type consists of a list of strict chunks.</span>
<a name="line-232"></a><span class='hs-comment'>--</span>
<a name="line-233"></a><span class='hs-comment'>-- The strict 'Text' type requires that an entire string fit into</span>
<a name="line-234"></a><span class='hs-comment'>-- memory at once. The lazy @Text@ type is capable of streaming</span>
<a name="line-235"></a><span class='hs-comment'>-- strings that are larger than memory using a small memory footprint.</span>
<a name="line-236"></a><span class='hs-comment'>-- In many cases, the overhead of chunked streaming makes the lazy</span>
<a name="line-237"></a><span class='hs-comment'>-- @Text@ type slower than its strict counterpart, but this is not</span>
<a name="line-238"></a><span class='hs-comment'>-- always the case. Sometimes, the time complexity of a function in</span>
<a name="line-239"></a><span class='hs-comment'>-- one module may be different from the other, due to their differing</span>
<a name="line-240"></a><span class='hs-comment'>-- internal structures.</span>
<a name="line-241"></a><span class='hs-comment'>--</span>
<a name="line-242"></a><span class='hs-comment'>-- Each module provides an almost identical API, with the main</span>
<a name="line-243"></a><span class='hs-comment'>-- difference being that the strict module uses 'Int' values for</span>
<a name="line-244"></a><span class='hs-comment'>-- lengths and counts, while the lazy module uses 'Int64' lengths.</span>
<a name="line-245"></a>
<a name="line-246"></a><span class='hs-comment'>-- $replacement</span>
<a name="line-247"></a><span class='hs-comment'>--</span>
<a name="line-248"></a><span class='hs-comment'>-- A 'Text' value is a sequence of Unicode scalar values, as defined</span>
<a name="line-249"></a><span class='hs-comment'>-- in &#xa7;3.9, definition D76 of the Unicode 5.2 standard:</span>
<a name="line-250"></a><span class='hs-comment'>-- <<a href="http://www.unicode.org/versions/Unicode5.2.0/ch03.pdf#page=35">http://www.unicode.org/versions/Unicode5.2.0/ch03.pdf#page=35</a>>. As</span>
<a name="line-251"></a><span class='hs-comment'>-- such, a 'Text' cannot contain values in the range U+D800 to U+DFFF</span>
<a name="line-252"></a><span class='hs-comment'>-- inclusive. Haskell implementations admit all Unicode code points</span>
<a name="line-253"></a><span class='hs-comment'>-- (&#xa7;3.4, definition D10) as 'Char' values, including code points</span>
<a name="line-254"></a><span class='hs-comment'>-- from this invalid range. This means that there are some 'Char'</span>
<a name="line-255"></a><span class='hs-comment'>-- values that are not valid Unicode scalar values, and the functions</span>
<a name="line-256"></a><span class='hs-comment'>-- in this module must handle those cases.</span>
<a name="line-257"></a><span class='hs-comment'>--</span>
<a name="line-258"></a><span class='hs-comment'>-- Within this module, many functions construct a 'Text' from one or</span>
<a name="line-259"></a><span class='hs-comment'>-- more 'Char' values. Those functions will substitute 'Char' values</span>
<a name="line-260"></a><span class='hs-comment'>-- that are not valid Unicode scalar values with the replacement</span>
<a name="line-261"></a><span class='hs-comment'>-- character \"&#xfffd;\" (U+FFFD). Functions that perform this</span>
<a name="line-262"></a><span class='hs-comment'>-- inspection and replacement are documented with the phrase</span>
<a name="line-263"></a><span class='hs-comment'>-- \"Performs replacement on invalid scalar values\".</span>
<a name="line-264"></a><span class='hs-comment'>--</span>
<a name="line-265"></a><span class='hs-comment'>-- (One reason for this policy of replacement is that internally, a</span>
<a name="line-266"></a><span class='hs-comment'>-- 'Text' value is represented as packed UTF-16 data. Values in the</span>
<a name="line-267"></a><span class='hs-comment'>-- range U+D800 through U+DFFF are used by UTF-16 to denote surrogate</span>
<a name="line-268"></a><span class='hs-comment'>-- code points, and so cannot be represented. The functions replace</span>
<a name="line-269"></a><span class='hs-comment'>-- invalid scalar values, instead of dropping them, as a security</span>
<a name="line-270"></a><span class='hs-comment'>-- measure. For details, see Unicode Technical Report 36, &#xa7;3.5:</span>
<a name="line-271"></a><span class='hs-comment'>-- <<a href="http://unicode.org/reports/tr36/#Deletion_of_Noncharacters">http://unicode.org/reports/tr36/#Deletion_of_Noncharacters</a>>)</span>
<a name="line-272"></a>
<a name="line-273"></a><span class='hs-comment'>-- $fusion</span>
<a name="line-274"></a><span class='hs-comment'>--</span>
<a name="line-275"></a><span class='hs-comment'>-- Most of the functions in this module are subject to /fusion/,</span>
<a name="line-276"></a><span class='hs-comment'>-- meaning that a pipeline of such functions will usually allocate at</span>
<a name="line-277"></a><span class='hs-comment'>-- most one 'Text' value.</span>
<a name="line-278"></a><span class='hs-comment'>--</span>
<a name="line-279"></a><span class='hs-comment'>-- As an example, consider the following pipeline:</span>
<a name="line-280"></a><span class='hs-comment'>--</span>
<a name="line-281"></a><span class='hs-comment'>-- > import Data.Text as T</span>
<a name="line-282"></a><span class='hs-comment'>-- > import Data.Text.Encoding as E</span>
<a name="line-283"></a><span class='hs-comment'>-- > import Data.ByteString (ByteString)</span>
<a name="line-284"></a><span class='hs-comment'>-- ></span>
<a name="line-285"></a><span class='hs-comment'>-- > countChars :: ByteString -> Int</span>
<a name="line-286"></a><span class='hs-comment'>-- > countChars = T.length . T.toUpper . E.decodeUtf8</span>
<a name="line-287"></a><span class='hs-comment'>--</span>
<a name="line-288"></a><span class='hs-comment'>-- From the type signatures involved, this looks like it should</span>
<a name="line-289"></a><span class='hs-comment'>-- allocate one 'ByteString' value, and two 'Text' values. However,</span>
<a name="line-290"></a><span class='hs-comment'>-- when a module is compiled with optimisation enabled under GHC, the</span>
<a name="line-291"></a><span class='hs-comment'>-- two intermediate 'Text' values will be optimised away, and the</span>
<a name="line-292"></a><span class='hs-comment'>-- function will be compiled down to a single loop over the source</span>
<a name="line-293"></a><span class='hs-comment'>-- 'ByteString'.</span>
<a name="line-294"></a><span class='hs-comment'>--</span>
<a name="line-295"></a><span class='hs-comment'>-- Functions that can be fused by the compiler are documented with the</span>
<a name="line-296"></a><span class='hs-comment'>-- phrase \"Subject to fusion\".</span>
<a name="line-297"></a>
<a name="line-298"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Eq</span> <span class='hs-conid'>Text</span> <span class='hs-keyword'>where</span>
<a name="line-299"></a> <span class='hs-conid'>Text</span> <span class='hs-varid'>arrA</span> <span class='hs-varid'>offA</span> <span class='hs-varid'>lenA</span> <span class='hs-varop'>==</span> <span class='hs-conid'>Text</span> <span class='hs-varid'>arrB</span> <span class='hs-varid'>offB</span> <span class='hs-varid'>lenB</span>
<a name="line-300"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>lenA</span> <span class='hs-varop'>==</span> <span class='hs-varid'>lenB</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>equal</span> <span class='hs-varid'>arrA</span> <span class='hs-varid'>offA</span> <span class='hs-varid'>arrB</span> <span class='hs-varid'>offB</span> <span class='hs-varid'>lenA</span>
<a name="line-301"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
<a name="line-302"></a> <span class='hs-comment'>{-# INLINE (==) #-}</span>
<a name="line-303"></a>
<a name="line-304"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Ord</span> <span class='hs-conid'>Text</span> <span class='hs-keyword'>where</span>
<a name="line-305"></a> <span class='hs-varid'>compare</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>compareText</span>
<a name="line-306"></a>
<a name="line-307"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Show</span> <span class='hs-conid'>Text</span> <span class='hs-keyword'>where</span>
<a name="line-308"></a> <span class='hs-varid'>showsPrec</span> <span class='hs-varid'>p</span> <span class='hs-varid'>ps</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>showsPrec</span> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-varid'>unpack</span> <span class='hs-varid'>ps</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span>
<a name="line-309"></a>
<a name="line-310"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Read</span> <span class='hs-conid'>Text</span> <span class='hs-keyword'>where</span>
<a name="line-311"></a> <span class='hs-varid'>readsPrec</span> <span class='hs-varid'>p</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>pack</span> <span class='hs-varid'>x</span><span class='hs-layout'>,</span><span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span><span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readsPrec</span> <span class='hs-varid'>p</span> <span class='hs-varid'>str</span><span class='hs-keyglyph'>]</span>
<a name="line-312"></a>
<a name="line-313"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monoid</span> <span class='hs-conid'>Text</span> <span class='hs-keyword'>where</span>
<a name="line-314"></a> <span class='hs-varid'>mempty</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>empty</span>
<a name="line-315"></a> <span class='hs-varid'>mappend</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>append</span>
<a name="line-316"></a> <span class='hs-varid'>mconcat</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>concat</span>
<a name="line-317"></a>
<a name="line-318"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>IsString</span> <span class='hs-conid'>Text</span> <span class='hs-keyword'>where</span>
<a name="line-319"></a> <span class='hs-varid'>fromString</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>pack</span>
<a name="line-320"></a>
<a name="line-321"></a><span class='hs-cpp'>#if defined(HAVE_DEEPSEQ)</span>
<a name="line-322"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>NFData</span> <span class='hs-conid'>Text</span>
<a name="line-323"></a><span class='hs-cpp'>#endif</span>
<a name="line-324"></a>
<a name="line-325"></a><span class='hs-comment'>-- This instance preserves data abstraction at the cost of inefficiency.</span>
<a name="line-326"></a><span class='hs-comment'>-- We omit reflection services for the sake of data abstraction.</span>
<a name="line-327"></a><span class='hs-comment'>-- </span>
<a name="line-328"></a><span class='hs-comment'>-- This instance was created by copying the behavior of Data.Set and</span>
<a name="line-329"></a><span class='hs-comment'>-- Data.Map. If you feel a mistake has been made, please feel free to</span>
<a name="line-330"></a><span class='hs-comment'>-- submit improvements.</span>
<a name="line-331"></a><span class='hs-comment'>--</span>
<a name="line-332"></a><span class='hs-comment'>-- Original discussion is archived here:</span>
<a name="line-333"></a>
<a name="line-334"></a><span class='hs-comment'>-- "could we get a Data instance for Data.Text.Text?"</span>
<a name="line-335"></a><span class='hs-comment'>-- <a href="http://groups.google.com/group/haskell-cafe/browse_thread/thread/b5bbb1b28a7e525d/0639d46852575b93">http://groups.google.com/group/haskell-cafe/browse_thread/thread/b5bbb1b28a7e525d/0639d46852575b93</a></span>
<a name="line-336"></a>
<a name="line-337"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Data</span> <span class='hs-conid'>Text</span> <span class='hs-keyword'>where</span>
<a name="line-338"></a> <span class='hs-varid'>gfoldl</span> <span class='hs-varid'>f</span> <span class='hs-varid'>z</span> <span class='hs-varid'>txt</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>z</span> <span class='hs-varid'>pack</span> <span class='hs-varop'>`f`</span> <span class='hs-layout'>(</span><span class='hs-varid'>unpack</span> <span class='hs-varid'>txt</span><span class='hs-layout'>)</span>
<a name="line-339"></a> <span class='hs-varid'>toConstr</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span><span class='hs-varop'>.</span><span class='hs-varid'>error</span> <span class='hs-str'>"Data.Text.Text.toConstr"</span>
<a name="line-340"></a> <span class='hs-varid'>gunfold</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span><span class='hs-varop'>.</span><span class='hs-varid'>error</span> <span class='hs-str'>"Data.Text.Text.gunfold"</span>
<a name="line-341"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ >= 612</span>
<a name="line-342"></a> <span class='hs-varid'>dataTypeOf</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mkNoRepType</span> <span class='hs-str'>"Data.Text.Text"</span>
<a name="line-343"></a><span class='hs-cpp'>#else</span>
<a name="line-344"></a> <span class='hs-varid'>dataTypeOf</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mkNorepType</span> <span class='hs-str'>"Data.Text.Text"</span>
<a name="line-345"></a><span class='hs-cpp'>#endif</span>
<a name="line-346"></a>
<a name="line-347"></a><a name="compareText"></a><span class='hs-comment'>-- | /O(n)/ Compare two 'Text' values lexicographically.</span>
<a name="line-348"></a><span class='hs-definition'>compareText</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ordering</span>
<a name="line-349"></a><span class='hs-definition'>compareText</span> <span class='hs-varid'>ta</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-sel'>_arrA</span> <span class='hs-sel'>_offA</span> <span class='hs-varid'>lenA</span><span class='hs-layout'>)</span> <span class='hs-varid'>tb</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-sel'>_arrB</span> <span class='hs-sel'>_offB</span> <span class='hs-varid'>lenB</span><span class='hs-layout'>)</span>
<a name="line-350"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>lenA</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>lenB</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>EQ</span>
<a name="line-351"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span>
<a name="line-352"></a> <span class='hs-keyword'>where</span>
<a name="line-353"></a> <span class='hs-varid'>go</span> <span class='hs-varop'>!</span><span class='hs-varid'>i</span> <span class='hs-varop'>!</span><span class='hs-varid'>j</span>
<a name="line-354"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>i</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>lenA</span> <span class='hs-varop'>||</span> <span class='hs-varid'>j</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>lenB</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>compare</span> <span class='hs-varid'>lenA</span> <span class='hs-varid'>lenB</span>
<a name="line-355"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>a</span> <span class='hs-varop'><</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>LT</span>
<a name="line-356"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>a</span> <span class='hs-varop'>></span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>GT</span>
<a name="line-357"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-varop'>+</span><span class='hs-varid'>di</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>j</span><span class='hs-varop'>+</span><span class='hs-varid'>dj</span><span class='hs-layout'>)</span>
<a name="line-358"></a> <span class='hs-keyword'>where</span> <span class='hs-conid'>Iter</span> <span class='hs-varid'>a</span> <span class='hs-varid'>di</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iter</span> <span class='hs-varid'>ta</span> <span class='hs-varid'>i</span>
<a name="line-359"></a> <span class='hs-conid'>Iter</span> <span class='hs-varid'>b</span> <span class='hs-varid'>dj</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iter</span> <span class='hs-varid'>tb</span> <span class='hs-varid'>j</span>
<a name="line-360"></a>
<a name="line-361"></a><span class='hs-comment'>-- -----------------------------------------------------------------------------</span>
<a name="line-362"></a><span class='hs-comment'>-- * Conversion to/from 'Text'</span>
<a name="line-363"></a>
<a name="line-364"></a><a name="pack"></a><span class='hs-comment'>-- | /O(n)/ Convert a 'String' into a 'Text'. Subject to</span>
<a name="line-365"></a><span class='hs-comment'>-- fusion. Performs replacement on invalid scalar values.</span>
<a name="line-366"></a><span class='hs-definition'>pack</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-367"></a><span class='hs-definition'>pack</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unstream</span> <span class='hs-varop'>.</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>streamList</span> <span class='hs-varop'>.</span> <span class='hs-conid'>L</span><span class='hs-varop'>.</span><span class='hs-varid'>map</span> <span class='hs-keyword'>safe</span>
<a name="line-368"></a><span class='hs-comment'>{-# INLINE [1] pack #-}</span>
<a name="line-369"></a>
<a name="line-370"></a><a name="unpack"></a><span class='hs-comment'>-- | /O(n)/ Convert a Text into a String. Subject to fusion.</span>
<a name="line-371"></a><span class='hs-definition'>unpack</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-372"></a><span class='hs-definition'>unpack</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>unstreamList</span> <span class='hs-varop'>.</span> <span class='hs-varid'>stream</span>
<a name="line-373"></a><span class='hs-comment'>{-# INLINE [1] unpack #-}</span>
<a name="line-374"></a>
<a name="line-375"></a><a name="singleton"></a><span class='hs-comment'>-- | /O(1)/ Convert a character into a Text. Subject to fusion.</span>
<a name="line-376"></a><span class='hs-comment'>-- Performs replacement on invalid scalar values.</span>
<a name="line-377"></a><span class='hs-definition'>singleton</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-378"></a><span class='hs-definition'>singleton</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unstream</span> <span class='hs-varop'>.</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>singleton</span> <span class='hs-varop'>.</span> <span class='hs-keyword'>safe</span>
<a name="line-379"></a><span class='hs-comment'>{-# INLINE [1] singleton #-}</span>
<a name="line-380"></a>
<a name="line-381"></a><span class='hs-comment'>-- -----------------------------------------------------------------------------</span>
<a name="line-382"></a><span class='hs-comment'>-- * Basic functions</span>
<a name="line-383"></a>
<a name="line-384"></a><a name="cons"></a><span class='hs-comment'>-- | /O(n)/ Adds a character to the front of a 'Text'. This function</span>
<a name="line-385"></a><span class='hs-comment'>-- is more costly than its 'List' counterpart because it requires</span>
<a name="line-386"></a><span class='hs-comment'>-- copying a new array. Subject to fusion. Performs replacement on</span>
<a name="line-387"></a><span class='hs-comment'>-- invalid scalar values.</span>
<a name="line-388"></a><span class='hs-definition'>cons</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-389"></a><span class='hs-definition'>cons</span> <span class='hs-varid'>c</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unstream</span> <span class='hs-layout'>(</span><span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>cons</span> <span class='hs-layout'>(</span><span class='hs-keyword'>safe</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-390"></a><span class='hs-comment'>{-# INLINE cons #-}</span>
<a name="line-391"></a>
<a name="line-392"></a><span class='hs-keyword'>infixr</span> <span class='hs-num'>5</span> <span class='hs-varop'>`cons`</span>
<a name="line-393"></a>
<a name="line-394"></a><a name="snoc"></a><span class='hs-comment'>-- | /O(n)/ Adds a character to the end of a 'Text'. This copies the</span>
<a name="line-395"></a><span class='hs-comment'>-- entire array in the process, unless fused. Subject to fusion.</span>
<a name="line-396"></a><span class='hs-comment'>-- Performs replacement on invalid scalar values.</span>
<a name="line-397"></a><span class='hs-definition'>snoc</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-398"></a><span class='hs-definition'>snoc</span> <span class='hs-varid'>t</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unstream</span> <span class='hs-layout'>(</span><span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>snoc</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-keyword'>safe</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-399"></a><span class='hs-comment'>{-# INLINE snoc #-}</span>
<a name="line-400"></a>
<a name="line-401"></a><a name="append"></a><span class='hs-comment'>-- | /O(n)/ Appends one 'Text' to the other by copying both of them</span>
<a name="line-402"></a><span class='hs-comment'>-- into a new 'Text'. Subject to fusion.</span>
<a name="line-403"></a><span class='hs-definition'>append</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-404"></a><span class='hs-definition'>append</span> <span class='hs-varid'>a</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr1</span> <span class='hs-varid'>off1</span> <span class='hs-varid'>len1</span><span class='hs-layout'>)</span> <span class='hs-varid'>b</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr2</span> <span class='hs-varid'>off2</span> <span class='hs-varid'>len2</span><span class='hs-layout'>)</span>
<a name="line-405"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>len1</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>b</span>
<a name="line-406"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>len2</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span>
<a name="line-407"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>len</span> <span class='hs-varop'>></span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Text</span> <span class='hs-layout'>(</span><span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>run</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-num'>0</span> <span class='hs-varid'>len</span>
<a name="line-408"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>overflowError</span> <span class='hs-str'>"append"</span>
<a name="line-409"></a> <span class='hs-keyword'>where</span>
<a name="line-410"></a> <span class='hs-varid'>len</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>len1</span><span class='hs-varop'>+</span><span class='hs-varid'>len2</span>
<a name="line-411"></a> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-412"></a> <span class='hs-varid'>arr</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>new</span> <span class='hs-varid'>len</span>
<a name="line-413"></a> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>copyI</span> <span class='hs-varid'>arr</span> <span class='hs-num'>0</span> <span class='hs-varid'>arr1</span> <span class='hs-varid'>off1</span> <span class='hs-varid'>len1</span>
<a name="line-414"></a> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>copyI</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>len1</span> <span class='hs-varid'>arr2</span> <span class='hs-varid'>off2</span> <span class='hs-varid'>len</span>
<a name="line-415"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>arr</span>
<a name="line-416"></a><span class='hs-comment'>{-# INLINE append #-}</span>
<a name="line-417"></a>
<a name="line-418"></a><span class='hs-comment'>{-# RULES
<a name="line-419"></a>"TEXT append -> fused" [~1] forall t1 t2.
<a name="line-420"></a> append t1 t2 = unstream (S.append (stream t1) (stream t2))
<a name="line-421"></a>"TEXT append -> unfused" [1] forall t1 t2.
<a name="line-422"></a> unstream (S.append (stream t1) (stream t2)) = append t1 t2
<a name="line-423"></a> #-}</span>
<a name="line-424"></a>
<a name="line-425"></a><a name="head"></a><span class='hs-comment'>-- | /O(1)/ Returns the first character of a 'Text', which must be</span>
<a name="line-426"></a><span class='hs-comment'>-- non-empty. Subject to fusion.</span>
<a name="line-427"></a><span class='hs-definition'>head</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span>
<a name="line-428"></a><span class='hs-definition'>head</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>head</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-429"></a><span class='hs-comment'>{-# INLINE head #-}</span>
<a name="line-430"></a>
<a name="line-431"></a><a name="uncons"></a><span class='hs-comment'>-- | /O(1)/ Returns the first character and rest of a 'Text', or</span>
<a name="line-432"></a><span class='hs-comment'>-- 'Nothing' if empty. Subject to fusion.</span>
<a name="line-433"></a><span class='hs-definition'>uncons</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span><span class='hs-layout'>,</span> <span class='hs-conid'>Text</span><span class='hs-layout'>)</span>
<a name="line-434"></a><span class='hs-definition'>uncons</span> <span class='hs-varid'>t</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span>
<a name="line-435"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>len</span> <span class='hs-varop'><=</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-436"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-layout'>,</span> <span class='hs-varid'>textP</span> <span class='hs-varid'>arr</span> <span class='hs-layout'>(</span><span class='hs-varid'>off</span><span class='hs-varop'>+</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span><span class='hs-comment'>-</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-437"></a> <span class='hs-keyword'>where</span> <span class='hs-conid'>Iter</span> <span class='hs-varid'>c</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iter</span> <span class='hs-varid'>t</span> <span class='hs-num'>0</span>
<a name="line-438"></a><span class='hs-comment'>{-# INLINE [1] uncons #-}</span>
<a name="line-439"></a>
<a name="line-440"></a><a name="second"></a><span class='hs-comment'>-- | Lifted from Control.Arrow and specialized.</span>
<a name="line-441"></a><span class='hs-definition'>second</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-442"></a><span class='hs-definition'>second</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>f</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-443"></a>
<a name="line-444"></a><a name="last"></a><span class='hs-comment'>-- | /O(1)/ Returns the last character of a 'Text', which must be</span>
<a name="line-445"></a><span class='hs-comment'>-- non-empty. Subject to fusion.</span>
<a name="line-446"></a><span class='hs-definition'>last</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span>
<a name="line-447"></a><span class='hs-definition'>last</span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span>
<a name="line-448"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>len</span> <span class='hs-varop'><=</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>emptyError</span> <span class='hs-str'>"last"</span>
<a name="line-449"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'><</span> <span class='hs-num'>0xDC00</span> <span class='hs-varop'>||</span> <span class='hs-varid'>n</span> <span class='hs-varop'>></span> <span class='hs-num'>0xDFFF</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unsafeChr</span> <span class='hs-varid'>n</span>
<a name="line-450"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>U16</span><span class='hs-varop'>.</span><span class='hs-varid'>chr2</span> <span class='hs-varid'>n0</span> <span class='hs-varid'>n</span>
<a name="line-451"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeIndex</span> <span class='hs-varid'>arr</span> <span class='hs-layout'>(</span><span class='hs-varid'>off</span><span class='hs-varop'>+</span><span class='hs-varid'>len</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-452"></a> <span class='hs-varid'>n0</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeIndex</span> <span class='hs-varid'>arr</span> <span class='hs-layout'>(</span><span class='hs-varid'>off</span><span class='hs-varop'>+</span><span class='hs-varid'>len</span><span class='hs-comment'>-</span><span class='hs-num'>2</span><span class='hs-layout'>)</span>
<a name="line-453"></a><span class='hs-comment'>{-# INLINE [1] last #-}</span>
<a name="line-454"></a>
<a name="line-455"></a><span class='hs-comment'>{-# RULES
<a name="line-456"></a>"TEXT last -> fused" [~1] forall t.
<a name="line-457"></a> last t = S.last (stream t)
<a name="line-458"></a>"TEXT last -> unfused" [1] forall t.
<a name="line-459"></a> S.last (stream t) = last t
<a name="line-460"></a> #-}</span>
<a name="line-461"></a>
<a name="line-462"></a><a name="tail"></a><span class='hs-comment'>-- | /O(1)/ Returns all characters after the head of a 'Text', which</span>
<a name="line-463"></a><span class='hs-comment'>-- must be non-empty. Subject to fusion.</span>
<a name="line-464"></a><span class='hs-definition'>tail</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-465"></a><span class='hs-definition'>tail</span> <span class='hs-varid'>t</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span>
<a name="line-466"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>len</span> <span class='hs-varop'><=</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>emptyError</span> <span class='hs-str'>"tail"</span>
<a name="line-467"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>textP</span> <span class='hs-varid'>arr</span> <span class='hs-layout'>(</span><span class='hs-varid'>off</span><span class='hs-varop'>+</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span><span class='hs-comment'>-</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span>
<a name="line-468"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iter_</span> <span class='hs-varid'>t</span> <span class='hs-num'>0</span>
<a name="line-469"></a><span class='hs-comment'>{-# INLINE [1] tail #-}</span>
<a name="line-470"></a>
<a name="line-471"></a><span class='hs-comment'>{-# RULES
<a name="line-472"></a>"TEXT tail -> fused" [~1] forall t.
<a name="line-473"></a> tail t = unstream (S.tail (stream t))
<a name="line-474"></a>"TEXT tail -> unfused" [1] forall t.
<a name="line-475"></a> unstream (S.tail (stream t)) = tail t
<a name="line-476"></a> #-}</span>
<a name="line-477"></a>
<a name="line-478"></a><a name="init"></a><span class='hs-comment'>-- | /O(1)/ Returns all but the last character of a 'Text', which must</span>
<a name="line-479"></a><span class='hs-comment'>-- be non-empty. Subject to fusion.</span>
<a name="line-480"></a><span class='hs-definition'>init</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-481"></a><span class='hs-definition'>init</span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>len</span> <span class='hs-varop'><=</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>emptyError</span> <span class='hs-str'>"init"</span>
<a name="line-482"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'>>=</span> <span class='hs-num'>0xDC00</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>n</span> <span class='hs-varop'><=</span> <span class='hs-num'>0xDFFF</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>textP</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span><span class='hs-comment'>-</span><span class='hs-num'>2</span><span class='hs-layout'>)</span>
<a name="line-483"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>textP</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-484"></a> <span class='hs-keyword'>where</span>
<a name="line-485"></a> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeIndex</span> <span class='hs-varid'>arr</span> <span class='hs-layout'>(</span><span class='hs-varid'>off</span><span class='hs-varop'>+</span><span class='hs-varid'>len</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-486"></a><span class='hs-comment'>{-# INLINE [1] init #-}</span>
<a name="line-487"></a>
<a name="line-488"></a><span class='hs-comment'>{-# RULES
<a name="line-489"></a>"TEXT init -> fused" [~1] forall t.
<a name="line-490"></a> init t = unstream (S.init (stream t))
<a name="line-491"></a>"TEXT init -> unfused" [1] forall t.
<a name="line-492"></a> unstream (S.init (stream t)) = init t
<a name="line-493"></a> #-}</span>
<a name="line-494"></a>
<a name="line-495"></a><a name="null"></a><span class='hs-comment'>-- | /O(1)/ Tests whether a 'Text' is empty or not. Subject to</span>
<a name="line-496"></a><span class='hs-comment'>-- fusion.</span>
<a name="line-497"></a><span class='hs-definition'>null</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-498"></a><span class='hs-definition'>null</span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-sel'>_arr</span> <span class='hs-sel'>_off</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-499"></a><span class='hs-cpp'>#if defined(ASSERTS)</span>
<a name="line-500"></a> <span class='hs-varid'>assert</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span> <span class='hs-varop'>>=</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span>
<a name="line-501"></a><span class='hs-cpp'>#endif</span>
<a name="line-502"></a> <span class='hs-varid'>len</span> <span class='hs-varop'><=</span> <span class='hs-num'>0</span>
<a name="line-503"></a><span class='hs-comment'>{-# INLINE [1] null #-}</span>
<a name="line-504"></a>
<a name="line-505"></a><span class='hs-comment'>{-# RULES
<a name="line-506"></a>"TEXT null -> fused" [~1] forall t.
<a name="line-507"></a> null t = S.null (stream t)
<a name="line-508"></a>"TEXT null -> unfused" [1] forall t.
<a name="line-509"></a> S.null (stream t) = null t
<a name="line-510"></a> #-}</span>
<a name="line-511"></a>
<a name="line-512"></a><a name="isSingleton"></a><span class='hs-comment'>-- | /O(1)/ Tests whether a 'Text' contains exactly one character.</span>
<a name="line-513"></a><span class='hs-comment'>-- Subject to fusion.</span>
<a name="line-514"></a><span class='hs-definition'>isSingleton</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-515"></a><span class='hs-definition'>isSingleton</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>isSingleton</span> <span class='hs-varop'>.</span> <span class='hs-varid'>stream</span>
<a name="line-516"></a><span class='hs-comment'>{-# INLINE isSingleton #-}</span>
<a name="line-517"></a>
<a name="line-518"></a><a name="length"></a><span class='hs-comment'>-- | /O(n)/ Returns the number of characters in a 'Text'.</span>
<a name="line-519"></a><span class='hs-comment'>-- Subject to fusion.</span>
<a name="line-520"></a><span class='hs-definition'>length</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-521"></a><span class='hs-definition'>length</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>length</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-522"></a><span class='hs-comment'>{-# INLINE length #-}</span>
<a name="line-523"></a>
<a name="line-524"></a><a name="compareLength"></a><span class='hs-comment'>-- | /O(n)/ Compare the count of characters in a 'Text' to a number.</span>
<a name="line-525"></a><span class='hs-comment'>-- Subject to fusion.</span>
<a name="line-526"></a><span class='hs-comment'>--</span>
<a name="line-527"></a><span class='hs-comment'>-- This function gives the same answer as comparing against the result</span>
<a name="line-528"></a><span class='hs-comment'>-- of 'length', but can short circuit if the count of characters is</span>
<a name="line-529"></a><span class='hs-comment'>-- greater than the number, and hence be more efficient.</span>
<a name="line-530"></a><span class='hs-definition'>compareLength</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ordering</span>
<a name="line-531"></a><span class='hs-definition'>compareLength</span> <span class='hs-varid'>t</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>compareLengthI</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-varid'>n</span>
<a name="line-532"></a><span class='hs-comment'>{-# INLINE [1] compareLength #-}</span>
<a name="line-533"></a>
<a name="line-534"></a><span class='hs-comment'>{-# RULES
<a name="line-535"></a>"TEXT compareN/length -> compareLength" [~1] forall t n.
<a name="line-536"></a> compare (length t) n = compareLength t n
<a name="line-537"></a> #-}</span>
<a name="line-538"></a>
<a name="line-539"></a><span class='hs-comment'>{-# RULES
<a name="line-540"></a>"TEXT ==N/length -> compareLength/==EQ" [~1] forall t n.
<a name="line-541"></a> (==) (length t) n = compareLength t n == EQ
<a name="line-542"></a> #-}</span>
<a name="line-543"></a>
<a name="line-544"></a><span class='hs-comment'>{-# RULES
<a name="line-545"></a>"TEXT /=N/length -> compareLength//=EQ" [~1] forall t n.
<a name="line-546"></a> (/=) (length t) n = compareLength t n /= EQ
<a name="line-547"></a> #-}</span>
<a name="line-548"></a>
<a name="line-549"></a><span class='hs-comment'>{-# RULES
<a name="line-550"></a>"TEXT <N/length -> compareLength/==LT" [~1] forall t n.
<a name="line-551"></a> (<) (length t) n = compareLength t n == LT
<a name="line-552"></a> #-}</span>
<a name="line-553"></a>
<a name="line-554"></a><span class='hs-comment'>{-# RULES
<a name="line-555"></a>"TEXT <=N/length -> compareLength//=GT" [~1] forall t n.
<a name="line-556"></a> (<=) (length t) n = compareLength t n /= GT
<a name="line-557"></a> #-}</span>
<a name="line-558"></a>
<a name="line-559"></a><span class='hs-comment'>{-# RULES
<a name="line-560"></a>"TEXT >N/length -> compareLength/==GT" [~1] forall t n.
<a name="line-561"></a> (>) (length t) n = compareLength t n == GT
<a name="line-562"></a> #-}</span>
<a name="line-563"></a>
<a name="line-564"></a><span class='hs-comment'>{-# RULES
<a name="line-565"></a>"TEXT >=N/length -> compareLength//=LT" [~1] forall t n.
<a name="line-566"></a> (>=) (length t) n = compareLength t n /= LT
<a name="line-567"></a> #-}</span>
<a name="line-568"></a>
<a name="line-569"></a><a name="map"></a><span class='hs-comment'>-- -----------------------------------------------------------------------------</span>
<a name="line-570"></a><span class='hs-comment'>-- * Transformations</span>
<a name="line-571"></a><span class='hs-comment'>-- | /O(n)/ 'map' @f@ @t@ is the 'Text' obtained by applying @f@ to</span>
<a name="line-572"></a><span class='hs-comment'>-- each element of @t@. Subject to fusion. Performs replacement on</span>
<a name="line-573"></a><span class='hs-comment'>-- invalid scalar values.</span>
<a name="line-574"></a><span class='hs-definition'>map</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-575"></a><span class='hs-definition'>map</span> <span class='hs-varid'>f</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unstream</span> <span class='hs-layout'>(</span><span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-keyword'>safe</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-576"></a><span class='hs-comment'>{-# INLINE [1] map #-}</span>
<a name="line-577"></a>
<a name="line-578"></a><a name="intercalate"></a><span class='hs-comment'>-- | /O(n)/ The 'intercalate' function takes a 'Text' and a list of</span>
<a name="line-579"></a><span class='hs-comment'>-- 'Text's and concatenates the list after interspersing the first</span>
<a name="line-580"></a><span class='hs-comment'>-- argument between each element of the list.</span>
<a name="line-581"></a><span class='hs-definition'>intercalate</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Text</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-582"></a><span class='hs-definition'>intercalate</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>concat</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-conid'>U</span><span class='hs-varop'>.</span><span class='hs-varid'>intersperse</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-583"></a><span class='hs-comment'>{-# INLINE intercalate #-}</span>
<a name="line-584"></a>
<a name="line-585"></a><a name="intersperse"></a><span class='hs-comment'>-- | /O(n)/ The 'intersperse' function takes a character and places it</span>
<a name="line-586"></a><span class='hs-comment'>-- between the characters of a 'Text'. Subject to fusion. Performs</span>
<a name="line-587"></a><span class='hs-comment'>-- replacement on invalid scalar values.</span>
<a name="line-588"></a><span class='hs-definition'>intersperse</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-589"></a><span class='hs-definition'>intersperse</span> <span class='hs-varid'>c</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unstream</span> <span class='hs-layout'>(</span><span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>intersperse</span> <span class='hs-layout'>(</span><span class='hs-keyword'>safe</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-590"></a><span class='hs-comment'>{-# INLINE intersperse #-}</span>
<a name="line-591"></a>
<a name="line-592"></a><a name="reverse"></a><span class='hs-comment'>-- | /O(n)/ Reverse the characters of a string. Subject to fusion.</span>
<a name="line-593"></a><span class='hs-definition'>reverse</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-594"></a><span class='hs-definition'>reverse</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>reverse</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-595"></a><span class='hs-comment'>{-# INLINE reverse #-}</span>
<a name="line-596"></a>
<a name="line-597"></a><a name="replace"></a><span class='hs-comment'>-- | /O(m+n)/ Replace every occurrence of one substring with another.</span>
<a name="line-598"></a><span class='hs-comment'>--</span>
<a name="line-599"></a><span class='hs-comment'>-- In (unlikely) bad cases, this function's time complexity degrades</span>
<a name="line-600"></a><span class='hs-comment'>-- towards /O(n*m)/.</span>
<a name="line-601"></a><span class='hs-definition'>replace</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-comment'>-- ^ Text to search for</span>
<a name="line-602"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-comment'>-- ^ Replacement text</span>
<a name="line-603"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-comment'>-- ^ Input text</span>
<a name="line-604"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-605"></a><span class='hs-definition'>replace</span> <span class='hs-varid'>s</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>intercalate</span> <span class='hs-varid'>d</span> <span class='hs-varop'>.</span> <span class='hs-varid'>splitOn</span> <span class='hs-varid'>s</span>
<a name="line-606"></a><span class='hs-comment'>{-# INLINE replace #-}</span>
<a name="line-607"></a>
<a name="line-608"></a><span class='hs-comment'>-- ----------------------------------------------------------------------------</span>
<a name="line-609"></a><span class='hs-comment'>-- ** Case conversions (folds)</span>
<a name="line-610"></a>
<a name="line-611"></a><span class='hs-comment'>-- $case</span>
<a name="line-612"></a><span class='hs-comment'>--</span>
<a name="line-613"></a><span class='hs-comment'>-- When case converting 'Text' values, do not use combinators like</span>
<a name="line-614"></a><span class='hs-comment'>-- @map toUpper@ to case convert each character of a string</span>
<a name="line-615"></a><span class='hs-comment'>-- individually, as this gives incorrect results according to the</span>
<a name="line-616"></a><span class='hs-comment'>-- rules of some writing systems. The whole-string case conversion</span>
<a name="line-617"></a><span class='hs-comment'>-- functions from this module, such as @toUpper@, obey the correct</span>
<a name="line-618"></a><span class='hs-comment'>-- case conversion rules. As a result, these functions may map one</span>
<a name="line-619"></a><span class='hs-comment'>-- input character to two or three output characters. For examples,</span>
<a name="line-620"></a><span class='hs-comment'>-- see the documentation of each function.</span>
<a name="line-621"></a><span class='hs-comment'>--</span>
<a name="line-622"></a><span class='hs-comment'>-- /Note/: In some languages, case conversion is a locale- and</span>
<a name="line-623"></a><span class='hs-comment'>-- context-dependent operation. The case conversion functions in this</span>
<a name="line-624"></a><span class='hs-comment'>-- module are /not/ locale sensitive. Programs that require locale</span>
<a name="line-625"></a><span class='hs-comment'>-- sensitivity should use appropriate versions of the case mapping</span>
<a name="line-626"></a><span class='hs-comment'>-- functions from the @text-icu@ package:</span>
<a name="line-627"></a><span class='hs-comment'>-- <<a href="http://hackage.haskell.org/package/text-icu">http://hackage.haskell.org/package/text-icu</a>></span>
<a name="line-628"></a>
<a name="line-629"></a><a name="toCaseFold"></a><span class='hs-comment'>-- | /O(n)/ Convert a string to folded case. This function is mainly</span>
<a name="line-630"></a><span class='hs-comment'>-- useful for performing caseless (also known as case insensitive)</span>
<a name="line-631"></a><span class='hs-comment'>-- string comparisons.</span>
<a name="line-632"></a><span class='hs-comment'>--</span>
<a name="line-633"></a><span class='hs-comment'>-- A string @x@ is a caseless match for a string @y@ if and only if:</span>
<a name="line-634"></a><span class='hs-comment'>--</span>
<a name="line-635"></a><span class='hs-comment'>-- @toCaseFold x == toCaseFold y@</span>
<a name="line-636"></a><span class='hs-comment'>--</span>
<a name="line-637"></a><span class='hs-comment'>-- The result string may be longer than the input string, and may</span>
<a name="line-638"></a><span class='hs-comment'>-- differ from applying 'toLower' to the input string. For instance,</span>
<a name="line-639"></a><span class='hs-comment'>-- the Armenian small ligature \"&#xfb13;\" (men now, U+FB13) is case</span>
<a name="line-640"></a><span class='hs-comment'>-- folded to the sequence \"&#x574;\" (men, U+0574) followed by</span>
<a name="line-641"></a><span class='hs-comment'>-- \"&#x576;\" (now, U+0576), while the Greek \"&#xb5;\" (micro sign,</span>
<a name="line-642"></a><span class='hs-comment'>-- U+00B5) is case folded to \"&#x3bc;\" (small letter mu, U+03BC)</span>
<a name="line-643"></a><span class='hs-comment'>-- instead of itself.</span>
<a name="line-644"></a><span class='hs-definition'>toCaseFold</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-645"></a><span class='hs-definition'>toCaseFold</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unstream</span> <span class='hs-layout'>(</span><span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>toCaseFold</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-646"></a><span class='hs-comment'>{-# INLINE [0] toCaseFold #-}</span>
<a name="line-647"></a>
<a name="line-648"></a><a name="toLower"></a><span class='hs-comment'>-- | /O(n)/ Convert a string to lower case, using simple case</span>
<a name="line-649"></a><span class='hs-comment'>-- conversion. The result string may be longer than the input string.</span>
<a name="line-650"></a><span class='hs-comment'>-- For instance, \"&#x130;\" (Latin capital letter I with dot above,</span>
<a name="line-651"></a><span class='hs-comment'>-- U+0130) maps to the sequence \"i\" (Latin small letter i, U+0069) followed</span>
<a name="line-652"></a><span class='hs-comment'>-- by \" &#x307;\" (combining dot above, U+0307).</span>
<a name="line-653"></a><span class='hs-definition'>toLower</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-654"></a><span class='hs-definition'>toLower</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unstream</span> <span class='hs-layout'>(</span><span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>toLower</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-655"></a><span class='hs-comment'>{-# INLINE toLower #-}</span>
<a name="line-656"></a>
<a name="line-657"></a><a name="toUpper"></a><span class='hs-comment'>-- | /O(n)/ Convert a string to upper case, using simple case</span>
<a name="line-658"></a><span class='hs-comment'>-- conversion. The result string may be longer than the input string.</span>
<a name="line-659"></a><span class='hs-comment'>-- For instance, the German \"&#xdf;\" (eszett, U+00DF) maps to the</span>
<a name="line-660"></a><span class='hs-comment'>-- two-letter sequence \"SS\".</span>
<a name="line-661"></a><span class='hs-definition'>toUpper</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-662"></a><span class='hs-definition'>toUpper</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unstream</span> <span class='hs-layout'>(</span><span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>toUpper</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-663"></a><span class='hs-comment'>{-# INLINE toUpper #-}</span>
<a name="line-664"></a>
<a name="line-665"></a><a name="justifyLeft"></a><span class='hs-comment'>-- | /O(n)/ Left-justify a string to the given length, using the</span>
<a name="line-666"></a><span class='hs-comment'>-- specified fill character on the right. Subject to fusion.</span>
<a name="line-667"></a><span class='hs-comment'>-- Performs replacement on invalid scalar values.</span>
<a name="line-668"></a><span class='hs-comment'>--</span>
<a name="line-669"></a><span class='hs-comment'>-- Examples:</span>
<a name="line-670"></a><span class='hs-comment'>--</span>
<a name="line-671"></a><span class='hs-comment'>-- > justifyLeft 7 'x' "foo" == "fooxxxx"</span>
<a name="line-672"></a><span class='hs-comment'>-- > justifyLeft 3 'x' "foobar" == "foobar"</span>
<a name="line-673"></a><span class='hs-definition'>justifyLeft</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-674"></a><span class='hs-definition'>justifyLeft</span> <span class='hs-varid'>k</span> <span class='hs-varid'>c</span> <span class='hs-varid'>t</span>
<a name="line-675"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>len</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>t</span>
<a name="line-676"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>t</span> <span class='hs-varop'>`append`</span> <span class='hs-varid'>replicateChar</span> <span class='hs-layout'>(</span><span class='hs-varid'>k</span><span class='hs-comment'>-</span><span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-varid'>c</span>
<a name="line-677"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>len</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>length</span> <span class='hs-varid'>t</span>
<a name="line-678"></a><span class='hs-comment'>{-# INLINE [1] justifyLeft #-}</span>
<a name="line-679"></a>
<a name="line-680"></a><span class='hs-comment'>{-# RULES
<a name="line-681"></a>"TEXT justifyLeft -> fused" [~1] forall k c t.
<a name="line-682"></a> justifyLeft k c t = unstream (S.justifyLeftI k c (stream t))
<a name="line-683"></a>"TEXT justifyLeft -> unfused" [1] forall k c t.
<a name="line-684"></a> unstream (S.justifyLeftI k c (stream t)) = justifyLeft k c t
<a name="line-685"></a> #-}</span>
<a name="line-686"></a>
<a name="line-687"></a><a name="justifyRight"></a><span class='hs-comment'>-- | /O(n)/ Right-justify a string to the given length, using the</span>
<a name="line-688"></a><span class='hs-comment'>-- specified fill character on the left. Performs replacement on</span>
<a name="line-689"></a><span class='hs-comment'>-- invalid scalar values.</span>
<a name="line-690"></a><span class='hs-comment'>--</span>
<a name="line-691"></a><span class='hs-comment'>-- Examples:</span>
<a name="line-692"></a><span class='hs-comment'>--</span>
<a name="line-693"></a><span class='hs-comment'>-- > justifyRight 7 'x' "bar" == "xxxxbar"</span>
<a name="line-694"></a><span class='hs-comment'>-- > justifyRight 3 'x' "foobar" == "foobar"</span>
<a name="line-695"></a><span class='hs-definition'>justifyRight</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-696"></a><span class='hs-definition'>justifyRight</span> <span class='hs-varid'>k</span> <span class='hs-varid'>c</span> <span class='hs-varid'>t</span>
<a name="line-697"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>len</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>t</span>
<a name="line-698"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>replicateChar</span> <span class='hs-layout'>(</span><span class='hs-varid'>k</span><span class='hs-comment'>-</span><span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-varid'>c</span> <span class='hs-varop'>`append`</span> <span class='hs-varid'>t</span>
<a name="line-699"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>len</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>length</span> <span class='hs-varid'>t</span>
<a name="line-700"></a><span class='hs-comment'>{-# INLINE justifyRight #-}</span>
<a name="line-701"></a>
<a name="line-702"></a><a name="center"></a><span class='hs-comment'>-- | /O(n)/ Center a string to the given length, using the specified</span>
<a name="line-703"></a><span class='hs-comment'>-- fill character on either side. Performs replacement on invalid</span>
<a name="line-704"></a><span class='hs-comment'>-- scalar values.</span>
<a name="line-705"></a><span class='hs-comment'>--</span>
<a name="line-706"></a><span class='hs-comment'>-- Examples:</span>
<a name="line-707"></a><span class='hs-comment'>--</span>
<a name="line-708"></a><span class='hs-comment'>-- > center 8 'x' "HS" = "xxxHSxxx"</span>
<a name="line-709"></a><span class='hs-definition'>center</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-710"></a><span class='hs-definition'>center</span> <span class='hs-varid'>k</span> <span class='hs-varid'>c</span> <span class='hs-varid'>t</span>
<a name="line-711"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>len</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>t</span>
<a name="line-712"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>replicateChar</span> <span class='hs-varid'>l</span> <span class='hs-varid'>c</span> <span class='hs-varop'>`append`</span> <span class='hs-varid'>t</span> <span class='hs-varop'>`append`</span> <span class='hs-varid'>replicateChar</span> <span class='hs-varid'>r</span> <span class='hs-varid'>c</span>
<a name="line-713"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>len</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>length</span> <span class='hs-varid'>t</span>
<a name="line-714"></a> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>k</span> <span class='hs-comment'>-</span> <span class='hs-varid'>len</span>
<a name="line-715"></a> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>d</span> <span class='hs-varop'>`div`</span> <span class='hs-num'>2</span>
<a name="line-716"></a> <span class='hs-varid'>l</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>d</span> <span class='hs-comment'>-</span> <span class='hs-varid'>r</span>
<a name="line-717"></a><span class='hs-comment'>{-# INLINE center #-}</span>
<a name="line-718"></a>
<a name="line-719"></a><a name="transpose"></a><span class='hs-comment'>-- | /O(n)/ The 'transpose' function transposes the rows and columns</span>
<a name="line-720"></a><span class='hs-comment'>-- of its 'Text' argument. Note that this function uses 'pack',</span>
<a name="line-721"></a><span class='hs-comment'>-- 'unpack', and the list version of transpose, and is thus not very</span>
<a name="line-722"></a><span class='hs-comment'>-- efficient.</span>
<a name="line-723"></a><span class='hs-definition'>transpose</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Text</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Text</span><span class='hs-keyglyph'>]</span>
<a name="line-724"></a><span class='hs-definition'>transpose</span> <span class='hs-varid'>ts</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span><span class='hs-varop'>.</span><span class='hs-varid'>map</span> <span class='hs-varid'>pack</span> <span class='hs-layout'>(</span><span class='hs-conid'>L</span><span class='hs-varop'>.</span><span class='hs-varid'>transpose</span> <span class='hs-layout'>(</span><span class='hs-conid'>P</span><span class='hs-varop'>.</span><span class='hs-varid'>map</span> <span class='hs-varid'>unpack</span> <span class='hs-varid'>ts</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-725"></a>
<a name="line-726"></a><span class='hs-comment'>-- -----------------------------------------------------------------------------</span>
<a name="line-727"></a><span class='hs-comment'>-- * Reducing 'Text's (folds)</span>
<a name="line-728"></a>
<a name="line-729"></a><a name="foldl"></a><span class='hs-comment'>-- | /O(n)/ 'foldl', applied to a binary operator, a starting value</span>
<a name="line-730"></a><span class='hs-comment'>-- (typically the left-identity of the operator), and a 'Text',</span>
<a name="line-731"></a><span class='hs-comment'>-- reduces the 'Text' using the binary operator, from left to right.</span>
<a name="line-732"></a><span class='hs-comment'>-- Subject to fusion.</span>
<a name="line-733"></a><span class='hs-definition'>foldl</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-734"></a><span class='hs-definition'>foldl</span> <span class='hs-varid'>f</span> <span class='hs-varid'>z</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>foldl</span> <span class='hs-varid'>f</span> <span class='hs-varid'>z</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-735"></a><span class='hs-comment'>{-# INLINE foldl #-}</span>
<a name="line-736"></a>
<a name="line-737"></a><a name="foldl'"></a><span class='hs-comment'>-- | /O(n)/ A strict version of 'foldl'. Subject to fusion.</span>
<a name="line-738"></a><span class='hs-definition'>foldl'</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-739"></a><span class='hs-definition'>foldl'</span> <span class='hs-varid'>f</span> <span class='hs-varid'>z</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>foldl'</span> <span class='hs-varid'>f</span> <span class='hs-varid'>z</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-740"></a><span class='hs-comment'>{-# INLINE foldl' #-}</span>
<a name="line-741"></a>
<a name="line-742"></a><a name="foldl1"></a><span class='hs-comment'>-- | /O(n)/ A variant of 'foldl' that has no starting value argument,</span>
<a name="line-743"></a><span class='hs-comment'>-- and thus must be applied to a non-empty 'Text'. Subject to fusion.</span>
<a name="line-744"></a><span class='hs-definition'>foldl1</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span>
<a name="line-745"></a><span class='hs-definition'>foldl1</span> <span class='hs-varid'>f</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>foldl1</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-746"></a><span class='hs-comment'>{-# INLINE foldl1 #-}</span>
<a name="line-747"></a>
<a name="line-748"></a><a name="foldl1'"></a><span class='hs-comment'>-- | /O(n)/ A strict version of 'foldl1'. Subject to fusion.</span>
<a name="line-749"></a><span class='hs-definition'>foldl1'</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span>
<a name="line-750"></a><span class='hs-definition'>foldl1'</span> <span class='hs-varid'>f</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>foldl1'</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-751"></a><span class='hs-comment'>{-# INLINE foldl1' #-}</span>
<a name="line-752"></a>
<a name="line-753"></a><a name="foldr"></a><span class='hs-comment'>-- | /O(n)/ 'foldr', applied to a binary operator, a starting value</span>
<a name="line-754"></a><span class='hs-comment'>-- (typically the right-identity of the operator), and a 'Text',</span>
<a name="line-755"></a><span class='hs-comment'>-- reduces the 'Text' using the binary operator, from right to left.</span>
<a name="line-756"></a><span class='hs-comment'>-- Subject to fusion.</span>
<a name="line-757"></a><span class='hs-definition'>foldr</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-758"></a><span class='hs-definition'>foldr</span> <span class='hs-varid'>f</span> <span class='hs-varid'>z</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>foldr</span> <span class='hs-varid'>f</span> <span class='hs-varid'>z</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-759"></a><span class='hs-comment'>{-# INLINE foldr #-}</span>
<a name="line-760"></a>
<a name="line-761"></a><a name="foldr1"></a><span class='hs-comment'>-- | /O(n)/ A variant of 'foldr' that has no starting value argument,</span>
<a name="line-762"></a><span class='hs-comment'>-- and thus must be applied to a non-empty 'Text'. Subject to</span>
<a name="line-763"></a><span class='hs-comment'>-- fusion.</span>
<a name="line-764"></a><span class='hs-definition'>foldr1</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span>
<a name="line-765"></a><span class='hs-definition'>foldr1</span> <span class='hs-varid'>f</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>foldr1</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-766"></a><span class='hs-comment'>{-# INLINE foldr1 #-}</span>
<a name="line-767"></a>
<a name="line-768"></a><span class='hs-comment'>-- -----------------------------------------------------------------------------</span>
<a name="line-769"></a><span class='hs-comment'>-- ** Special folds</span>
<a name="line-770"></a>
<a name="line-771"></a><a name="concat"></a><span class='hs-comment'>-- | /O(n)/ Concatenate a list of 'Text's.</span>
<a name="line-772"></a><span class='hs-definition'>concat</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Text</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-773"></a><span class='hs-definition'>concat</span> <span class='hs-varid'>ts</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>ts'</span> <span class='hs-keyword'>of</span>
<a name="line-774"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>empty</span>
<a name="line-775"></a> <span class='hs-keyglyph'>[</span><span class='hs-varid'>t</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span>
<a name="line-776"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-layout'>(</span><span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>run</span> <span class='hs-varid'>go</span><span class='hs-layout'>)</span> <span class='hs-num'>0</span> <span class='hs-varid'>len</span>
<a name="line-777"></a> <span class='hs-keyword'>where</span>
<a name="line-778"></a> <span class='hs-varid'>ts'</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>L</span><span class='hs-varop'>.</span><span class='hs-varid'>filter</span> <span class='hs-layout'>(</span><span class='hs-varid'>not</span> <span class='hs-varop'>.</span> <span class='hs-varid'>null</span><span class='hs-layout'>)</span> <span class='hs-varid'>ts</span>
<a name="line-779"></a> <span class='hs-varid'>len</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>sumP</span> <span class='hs-str'>"concat"</span> <span class='hs-varop'>$</span> <span class='hs-conid'>L</span><span class='hs-varop'>.</span><span class='hs-varid'>map</span> <span class='hs-varid'>lengthWord16</span> <span class='hs-varid'>ts'</span>
<a name="line-780"></a> <span class='hs-varid'>go</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-781"></a> <span class='hs-varid'>arr</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>new</span> <span class='hs-varid'>len</span>
<a name="line-782"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>step</span> <span class='hs-varid'>i</span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>a</span> <span class='hs-varid'>o</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-783"></a> <span class='hs-keyword'>let</span> <span class='hs-varop'>!</span><span class='hs-varid'>j</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>i</span> <span class='hs-varop'>+</span> <span class='hs-varid'>l</span> <span class='hs-keyword'>in</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>copyI</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>i</span> <span class='hs-varid'>a</span> <span class='hs-varid'>o</span> <span class='hs-varid'>j</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-varid'>j</span>
<a name="line-784"></a> <span class='hs-varid'>foldM</span> <span class='hs-varid'>step</span> <span class='hs-num'>0</span> <span class='hs-varid'>ts'</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-varid'>arr</span>
<a name="line-785"></a>
<a name="line-786"></a><a name="concatMap"></a><span class='hs-comment'>-- | /O(n)/ Map a function over a 'Text' that results in a 'Text', and</span>
<a name="line-787"></a><span class='hs-comment'>-- concatenate the results.</span>
<a name="line-788"></a><span class='hs-definition'>concatMap</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-789"></a><span class='hs-definition'>concatMap</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>concat</span> <span class='hs-varop'>.</span> <span class='hs-varid'>foldr</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-conop'>:</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-conid'>[]</span>
<a name="line-790"></a><span class='hs-comment'>{-# INLINE concatMap #-}</span>
<a name="line-791"></a>
<a name="line-792"></a><a name="any"></a><span class='hs-comment'>-- | /O(n)/ 'any' @p@ @t@ determines whether any character in the</span>
<a name="line-793"></a><span class='hs-comment'>-- 'Text' @t@ satisifes the predicate @p@. Subject to fusion.</span>
<a name="line-794"></a><span class='hs-definition'>any</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-795"></a><span class='hs-definition'>any</span> <span class='hs-varid'>p</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>any</span> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-796"></a><span class='hs-comment'>{-# INLINE any #-}</span>
<a name="line-797"></a>
<a name="line-798"></a><a name="all"></a><span class='hs-comment'>-- | /O(n)/ 'all' @p@ @t@ determines whether all characters in the</span>
<a name="line-799"></a><span class='hs-comment'>-- 'Text' @t@ satisify the predicate @p@. Subject to fusion.</span>
<a name="line-800"></a><span class='hs-definition'>all</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-801"></a><span class='hs-definition'>all</span> <span class='hs-varid'>p</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>all</span> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-802"></a><span class='hs-comment'>{-# INLINE all #-}</span>
<a name="line-803"></a>
<a name="line-804"></a><a name="maximum"></a><span class='hs-comment'>-- | /O(n)/ 'maximum' returns the maximum value from a 'Text', which</span>
<a name="line-805"></a><span class='hs-comment'>-- must be non-empty. Subject to fusion.</span>
<a name="line-806"></a><span class='hs-definition'>maximum</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span>
<a name="line-807"></a><span class='hs-definition'>maximum</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>maximum</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-808"></a><span class='hs-comment'>{-# INLINE maximum #-}</span>
<a name="line-809"></a>
<a name="line-810"></a><a name="minimum"></a><span class='hs-comment'>-- | /O(n)/ 'minimum' returns the minimum value from a 'Text', which</span>
<a name="line-811"></a><span class='hs-comment'>-- must be non-empty. Subject to fusion.</span>
<a name="line-812"></a><span class='hs-definition'>minimum</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span>
<a name="line-813"></a><span class='hs-definition'>minimum</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>minimum</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-814"></a><span class='hs-comment'>{-# INLINE minimum #-}</span>
<a name="line-815"></a>
<a name="line-816"></a><span class='hs-comment'>-- -----------------------------------------------------------------------------</span>
<a name="line-817"></a><span class='hs-comment'>-- * Building 'Text's</span>
<a name="line-818"></a>
<a name="line-819"></a><a name="scanl"></a><span class='hs-comment'>-- | /O(n)/ 'scanl' is similar to 'foldl', but returns a list of</span>
<a name="line-820"></a><span class='hs-comment'>-- successive reduced values from the left. Subject to fusion.</span>
<a name="line-821"></a><span class='hs-comment'>-- Performs replacement on invalid scalar values.</span>
<a name="line-822"></a><span class='hs-comment'>--</span>
<a name="line-823"></a><span class='hs-comment'>-- > scanl f z [x1, x2, ...] == [z, z `f` x1, (z `f` x1) `f` x2, ...]</span>
<a name="line-824"></a><span class='hs-comment'>--</span>
<a name="line-825"></a><span class='hs-comment'>-- Note that</span>
<a name="line-826"></a><span class='hs-comment'>--</span>
<a name="line-827"></a><span class='hs-comment'>-- > last (scanl f z xs) == foldl f z xs.</span>
<a name="line-828"></a><span class='hs-definition'>scanl</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-829"></a><span class='hs-definition'>scanl</span> <span class='hs-varid'>f</span> <span class='hs-varid'>z</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unstream</span> <span class='hs-layout'>(</span><span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>scanl</span> <span class='hs-varid'>g</span> <span class='hs-varid'>z</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-830"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>g</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>safe</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-831"></a><span class='hs-comment'>{-# INLINE scanl #-}</span>
<a name="line-832"></a>
<a name="line-833"></a><a name="scanl1"></a><span class='hs-comment'>-- | /O(n)/ 'scanl1' is a variant of 'scanl' that has no starting</span>
<a name="line-834"></a><span class='hs-comment'>-- value argument. Subject to fusion. Performs replacement on</span>
<a name="line-835"></a><span class='hs-comment'>-- invalid scalar values.</span>
<a name="line-836"></a><span class='hs-comment'>--</span>
<a name="line-837"></a><span class='hs-comment'>-- > scanl1 f [x1, x2, ...] == [x1, x1 `f` x2, ...]</span>
<a name="line-838"></a><span class='hs-definition'>scanl1</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-839"></a><span class='hs-definition'>scanl1</span> <span class='hs-varid'>f</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>null</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>empty</span>
<a name="line-840"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>scanl</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>unsafeHead</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>unsafeTail</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-841"></a><span class='hs-comment'>{-# INLINE scanl1 #-}</span>
<a name="line-842"></a>
<a name="line-843"></a><a name="scanr"></a><span class='hs-comment'>-- | /O(n)/ 'scanr' is the right-to-left dual of 'scanl'. Performs</span>
<a name="line-844"></a><span class='hs-comment'>-- replacement on invalid scalar values.</span>
<a name="line-845"></a><span class='hs-comment'>--</span>
<a name="line-846"></a><span class='hs-comment'>-- > scanr f v == reverse . scanl (flip f) v . reverse</span>
<a name="line-847"></a><span class='hs-definition'>scanr</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-848"></a><span class='hs-definition'>scanr</span> <span class='hs-varid'>f</span> <span class='hs-varid'>z</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>reverse</span> <span class='hs-varop'>.</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>reverseScanr</span> <span class='hs-varid'>g</span> <span class='hs-varid'>z</span> <span class='hs-varop'>.</span> <span class='hs-varid'>reverseStream</span>
<a name="line-849"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>g</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>safe</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-850"></a><span class='hs-comment'>{-# INLINE scanr #-}</span>
<a name="line-851"></a>
<a name="line-852"></a><a name="scanr1"></a><span class='hs-comment'>-- | /O(n)/ 'scanr1' is a variant of 'scanr' that has no starting</span>
<a name="line-853"></a><span class='hs-comment'>-- value argument. Subject to fusion. Performs replacement on</span>
<a name="line-854"></a><span class='hs-comment'>-- invalid scalar values.</span>
<a name="line-855"></a><span class='hs-definition'>scanr1</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-856"></a><span class='hs-definition'>scanr1</span> <span class='hs-varid'>f</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>null</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>empty</span>
<a name="line-857"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>scanr</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>last</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>init</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-858"></a><span class='hs-comment'>{-# INLINE scanr1 #-}</span>
<a name="line-859"></a>
<a name="line-860"></a><a name="mapAccumL"></a><span class='hs-comment'>-- | /O(n)/ Like a combination of 'map' and 'foldl''. Applies a</span>
<a name="line-861"></a><span class='hs-comment'>-- function to each element of a 'Text', passing an accumulating</span>
<a name="line-862"></a><span class='hs-comment'>-- parameter from left to right, and returns a final 'Text'. Performs</span>
<a name="line-863"></a><span class='hs-comment'>-- replacement on invalid scalar values.</span>
<a name="line-864"></a><span class='hs-definition'>mapAccumL</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-conid'>Char</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Text</span><span class='hs-layout'>)</span>
<a name="line-865"></a><span class='hs-definition'>mapAccumL</span> <span class='hs-varid'>f</span> <span class='hs-varid'>z0</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>mapAccumL</span> <span class='hs-varid'>g</span> <span class='hs-varid'>z0</span> <span class='hs-varop'>.</span> <span class='hs-varid'>stream</span>
<a name="line-866"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>g</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>second</span> <span class='hs-keyword'>safe</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-867"></a><span class='hs-comment'>{-# INLINE mapAccumL #-}</span>
<a name="line-868"></a>
<a name="line-869"></a><a name="mapAccumR"></a><span class='hs-comment'>-- | The 'mapAccumR' function behaves like a combination of 'map' and</span>
<a name="line-870"></a><span class='hs-comment'>-- a strict 'foldr'; it applies a function to each element of a</span>
<a name="line-871"></a><span class='hs-comment'>-- 'Text', passing an accumulating parameter from right to left, and</span>
<a name="line-872"></a><span class='hs-comment'>-- returning a final value of this accumulator together with the new</span>
<a name="line-873"></a><span class='hs-comment'>-- 'Text'.</span>
<a name="line-874"></a><span class='hs-comment'>-- Performs replacement on invalid scalar values.</span>
<a name="line-875"></a><span class='hs-definition'>mapAccumR</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-conid'>Char</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Text</span><span class='hs-layout'>)</span>
<a name="line-876"></a><span class='hs-definition'>mapAccumR</span> <span class='hs-varid'>f</span> <span class='hs-varid'>z0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>second</span> <span class='hs-varid'>reverse</span> <span class='hs-varop'>.</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>mapAccumL</span> <span class='hs-varid'>g</span> <span class='hs-varid'>z0</span> <span class='hs-varop'>.</span> <span class='hs-varid'>reverseStream</span>
<a name="line-877"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>g</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>second</span> <span class='hs-keyword'>safe</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-878"></a><span class='hs-comment'>{-# INLINE mapAccumR #-}</span>
<a name="line-879"></a>
<a name="line-880"></a><span class='hs-comment'>-- -----------------------------------------------------------------------------</span>
<a name="line-881"></a><span class='hs-comment'>-- ** Generating and unfolding 'Text's</span>
<a name="line-882"></a>
<a name="line-883"></a><a name="replicate"></a><span class='hs-comment'>-- | /O(n*m)/ 'replicate' @n@ @t@ is a 'Text' consisting of the input</span>
<a name="line-884"></a><span class='hs-comment'>-- @t@ repeated @n@ times.</span>
<a name="line-885"></a><span class='hs-definition'>replicate</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-886"></a><span class='hs-definition'>replicate</span> <span class='hs-varid'>n</span> <span class='hs-varid'>t</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>a</span> <span class='hs-varid'>o</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span>
<a name="line-887"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'><=</span> <span class='hs-num'>0</span> <span class='hs-varop'>||</span> <span class='hs-varid'>l</span> <span class='hs-varop'><=</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>empty</span>
<a name="line-888"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'>==</span> <span class='hs-num'>1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>t</span>
<a name="line-889"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isSingleton</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>replicateChar</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-varid'>unsafeHead</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-890"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'><=</span> <span class='hs-varid'>maxBound</span> <span class='hs-varop'>`div`</span> <span class='hs-varid'>l</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Text</span> <span class='hs-layout'>(</span><span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>run</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-num'>0</span> <span class='hs-varid'>len</span>
<a name="line-891"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>overflowError</span> <span class='hs-str'>"replicate"</span>
<a name="line-892"></a> <span class='hs-keyword'>where</span>
<a name="line-893"></a> <span class='hs-varid'>len</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>l</span> <span class='hs-varop'>*</span> <span class='hs-varid'>n</span>
<a name="line-894"></a> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-895"></a> <span class='hs-varid'>arr</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>new</span> <span class='hs-varid'>len</span>
<a name="line-896"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>loop</span> <span class='hs-varop'>!</span><span class='hs-varid'>d</span> <span class='hs-varop'>!</span><span class='hs-varid'>i</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>i</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-varid'>arr</span>
<a name="line-897"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>d</span> <span class='hs-varop'>+</span> <span class='hs-varid'>l</span>
<a name="line-898"></a> <span class='hs-keyword'>in</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>copyI</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>d</span> <span class='hs-varid'>a</span> <span class='hs-varid'>o</span> <span class='hs-varid'>m</span> <span class='hs-varop'>>></span> <span class='hs-varid'>loop</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-899"></a> <span class='hs-varid'>loop</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span>
<a name="line-900"></a><span class='hs-comment'>{-# INLINE [1] replicate #-}</span>
<a name="line-901"></a>
<a name="line-902"></a><span class='hs-comment'>{-# RULES
<a name="line-903"></a>"TEXT replicate/singleton -> replicateChar" [~1] forall n c.
<a name="line-904"></a> replicate n (singleton c) = replicateChar n c
<a name="line-905"></a> #-}</span>
<a name="line-906"></a>
<a name="line-907"></a><a name="replicateChar"></a><span class='hs-comment'>-- | /O(n)/ 'replicateChar' @n@ @c@ is a 'Text' of length @n@ with @c@ the</span>
<a name="line-908"></a><span class='hs-comment'>-- value of every element. Subject to fusion.</span>
<a name="line-909"></a><span class='hs-definition'>replicateChar</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-910"></a><span class='hs-definition'>replicateChar</span> <span class='hs-varid'>n</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unstream</span> <span class='hs-layout'>(</span><span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>replicateCharI</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-keyword'>safe</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-911"></a><span class='hs-comment'>{-# INLINE replicateChar #-}</span>
<a name="line-912"></a>
<a name="line-913"></a><a name="unfoldr"></a><span class='hs-comment'>-- | /O(n)/, where @n@ is the length of the result. The 'unfoldr'</span>
<a name="line-914"></a><span class='hs-comment'>-- function is analogous to the List 'L.unfoldr'. 'unfoldr' builds a</span>
<a name="line-915"></a><span class='hs-comment'>-- 'Text' from a seed value. The function takes the element and</span>
<a name="line-916"></a><span class='hs-comment'>-- returns 'Nothing' if it is done producing the 'Text', otherwise</span>
<a name="line-917"></a><span class='hs-comment'>-- 'Just' @(a,b)@. In this case, @a@ is the next 'Char' in the</span>
<a name="line-918"></a><span class='hs-comment'>-- string, and @b@ is the seed value for further production. Subject</span>
<a name="line-919"></a><span class='hs-comment'>-- to fusion. Performs replacement on invalid scalar values.</span>
<a name="line-920"></a><span class='hs-definition'>unfoldr</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span><span class='hs-layout'>,</span><span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-921"></a><span class='hs-definition'>unfoldr</span> <span class='hs-varid'>f</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unstream</span> <span class='hs-layout'>(</span><span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>unfoldr</span> <span class='hs-layout'>(</span><span class='hs-varid'>firstf</span> <span class='hs-keyword'>safe</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-922"></a><span class='hs-comment'>{-# INLINE unfoldr #-}</span>
<a name="line-923"></a>
<a name="line-924"></a><a name="unfoldrN"></a><span class='hs-comment'>-- | /O(n)/ Like 'unfoldr', 'unfoldrN' builds a 'Text' from a seed</span>
<a name="line-925"></a><span class='hs-comment'>-- value. However, the length of the result should be limited by the</span>
<a name="line-926"></a><span class='hs-comment'>-- first argument to 'unfoldrN'. This function is more efficient than</span>
<a name="line-927"></a><span class='hs-comment'>-- 'unfoldr' when the maximum length of the result is known and</span>
<a name="line-928"></a><span class='hs-comment'>-- correct, otherwise its performance is similar to 'unfoldr'. Subject</span>
<a name="line-929"></a><span class='hs-comment'>-- to fusion. Performs replacement on invalid scalar values.</span>
<a name="line-930"></a><span class='hs-definition'>unfoldrN</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span><span class='hs-layout'>,</span><span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-931"></a><span class='hs-definition'>unfoldrN</span> <span class='hs-varid'>n</span> <span class='hs-varid'>f</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unstream</span> <span class='hs-layout'>(</span><span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>unfoldrN</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-varid'>firstf</span> <span class='hs-keyword'>safe</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-932"></a><span class='hs-comment'>{-# INLINE unfoldrN #-}</span>
<a name="line-933"></a>
<a name="line-934"></a><span class='hs-comment'>-- -----------------------------------------------------------------------------</span>
<a name="line-935"></a><span class='hs-comment'>-- * Substrings</span>
<a name="line-936"></a>
<a name="line-937"></a><a name="take"></a><span class='hs-comment'>-- | /O(n)/ 'take' @n@, applied to a 'Text', returns the prefix of the</span>
<a name="line-938"></a><span class='hs-comment'>-- 'Text' of length @n@, or the 'Text' itself if @n@ is greater than</span>
<a name="line-939"></a><span class='hs-comment'>-- the length of the Text. Subject to fusion.</span>
<a name="line-940"></a><span class='hs-definition'>take</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-941"></a><span class='hs-definition'>take</span> <span class='hs-varid'>n</span> <span class='hs-varid'>t</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span>
<a name="line-942"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'><=</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>empty</span>
<a name="line-943"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>len</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>t</span>
<a name="line-944"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-layout'>(</span><span class='hs-varid'>loop</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span>
<a name="line-945"></a> <span class='hs-keyword'>where</span>
<a name="line-946"></a> <span class='hs-varid'>loop</span> <span class='hs-varop'>!</span><span class='hs-varid'>i</span> <span class='hs-varop'>!</span><span class='hs-varid'>cnt</span>
<a name="line-947"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>i</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>len</span> <span class='hs-varop'>||</span> <span class='hs-varid'>cnt</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>i</span>
<a name="line-948"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-varop'>+</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>cnt</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-949"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iter_</span> <span class='hs-varid'>t</span> <span class='hs-varid'>i</span>
<a name="line-950"></a><span class='hs-comment'>{-# INLINE [1] take #-}</span>
<a name="line-951"></a>
<a name="line-952"></a><span class='hs-comment'>{-# RULES
<a name="line-953"></a>"TEXT take -> fused" [~1] forall n t.
<a name="line-954"></a> take n t = unstream (S.take n (stream t))
<a name="line-955"></a>"TEXT take -> unfused" [1] forall n t.
<a name="line-956"></a> unstream (S.take n (stream t)) = take n t
<a name="line-957"></a> #-}</span>
<a name="line-958"></a>
<a name="line-959"></a><a name="drop"></a><span class='hs-comment'>-- | /O(n)/ 'drop' @n@, applied to a 'Text', returns the suffix of the</span>
<a name="line-960"></a><span class='hs-comment'>-- 'Text' after the first @n@ characters, or the empty 'Text' if @n@</span>
<a name="line-961"></a><span class='hs-comment'>-- is greater than the length of the 'Text'. Subject to fusion.</span>
<a name="line-962"></a><span class='hs-definition'>drop</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-963"></a><span class='hs-definition'>drop</span> <span class='hs-varid'>n</span> <span class='hs-varid'>t</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span>
<a name="line-964"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'><=</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>t</span>
<a name="line-965"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>len</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>empty</span>
<a name="line-966"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span>
<a name="line-967"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>loop</span> <span class='hs-varop'>!</span><span class='hs-varid'>i</span> <span class='hs-varop'>!</span><span class='hs-varid'>cnt</span>
<a name="line-968"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>i</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>len</span> <span class='hs-varop'>||</span> <span class='hs-varid'>cnt</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-layout'>(</span><span class='hs-varid'>off</span><span class='hs-varop'>+</span><span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span><span class='hs-comment'>-</span><span class='hs-varid'>i</span><span class='hs-layout'>)</span>
<a name="line-969"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-varop'>+</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>cnt</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-970"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iter_</span> <span class='hs-varid'>t</span> <span class='hs-varid'>i</span>
<a name="line-971"></a><span class='hs-comment'>{-# INLINE [1] drop #-}</span>
<a name="line-972"></a>
<a name="line-973"></a><span class='hs-comment'>{-# RULES
<a name="line-974"></a>"TEXT drop -> fused" [~1] forall n t.
<a name="line-975"></a> drop n t = unstream (S.drop n (stream t))
<a name="line-976"></a>"TEXT drop -> unfused" [1] forall n t.
<a name="line-977"></a> unstream (S.drop n (stream t)) = drop n t
<a name="line-978"></a> #-}</span>
<a name="line-979"></a>
<a name="line-980"></a><a name="takeWhile"></a><span class='hs-comment'>-- | /O(n)/ 'takeWhile', applied to a predicate @p@ and a 'Text',</span>
<a name="line-981"></a><span class='hs-comment'>-- returns the longest prefix (possibly empty) of elements that</span>
<a name="line-982"></a><span class='hs-comment'>-- satisfy @p@. Subject to fusion.</span>
<a name="line-983"></a><span class='hs-definition'>takeWhile</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-984"></a><span class='hs-definition'>takeWhile</span> <span class='hs-varid'>p</span> <span class='hs-varid'>t</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-num'>0</span>
<a name="line-985"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>loop</span> <span class='hs-varop'>!</span><span class='hs-varid'>i</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>i</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>len</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>t</span>
<a name="line-986"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>p</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-varop'>+</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span>
<a name="line-987"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>textP</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>i</span>
<a name="line-988"></a> <span class='hs-keyword'>where</span> <span class='hs-conid'>Iter</span> <span class='hs-varid'>c</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iter</span> <span class='hs-varid'>t</span> <span class='hs-varid'>i</span>
<a name="line-989"></a><span class='hs-comment'>{-# INLINE [1] takeWhile #-}</span>
<a name="line-990"></a>
<a name="line-991"></a><span class='hs-comment'>{-# RULES
<a name="line-992"></a>"TEXT takeWhile -> fused" [~1] forall p t.
<a name="line-993"></a> takeWhile p t = unstream (S.takeWhile p (stream t))
<a name="line-994"></a>"TEXT takeWhile -> unfused" [1] forall p t.
<a name="line-995"></a> unstream (S.takeWhile p (stream t)) = takeWhile p t
<a name="line-996"></a> #-}</span>
<a name="line-997"></a>
<a name="line-998"></a><a name="dropWhile"></a><span class='hs-comment'>-- | /O(n)/ 'dropWhile' @p@ @t@ returns the suffix remaining after</span>
<a name="line-999"></a><span class='hs-comment'>-- 'takeWhile' @p@ @t@. Subject to fusion.</span>
<a name="line-1000"></a><span class='hs-definition'>dropWhile</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-1001"></a><span class='hs-definition'>dropWhile</span> <span class='hs-varid'>p</span> <span class='hs-varid'>t</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span>
<a name="line-1002"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>loop</span> <span class='hs-varop'>!</span><span class='hs-varid'>i</span> <span class='hs-varop'>!</span><span class='hs-varid'>l</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>l</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>len</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>empty</span>
<a name="line-1003"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>p</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-varop'>+</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-varop'>+</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span>
<a name="line-1004"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-layout'>(</span><span class='hs-varid'>off</span><span class='hs-varop'>+</span><span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span><span class='hs-comment'>-</span><span class='hs-varid'>l</span><span class='hs-layout'>)</span>
<a name="line-1005"></a> <span class='hs-keyword'>where</span> <span class='hs-conid'>Iter</span> <span class='hs-varid'>c</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iter</span> <span class='hs-varid'>t</span> <span class='hs-varid'>i</span>
<a name="line-1006"></a><span class='hs-comment'>{-# INLINE [1] dropWhile #-}</span>
<a name="line-1007"></a>
<a name="line-1008"></a><span class='hs-comment'>{-# RULES
<a name="line-1009"></a>"TEXT dropWhile -> fused" [~1] forall p t.
<a name="line-1010"></a> dropWhile p t = unstream (S.dropWhile p (stream t))
<a name="line-1011"></a>"TEXT dropWhile -> unfused" [1] forall p t.
<a name="line-1012"></a> unstream (S.dropWhile p (stream t)) = dropWhile p t
<a name="line-1013"></a> #-}</span>
<a name="line-1014"></a>
<a name="line-1015"></a><a name="dropWhileEnd"></a><span class='hs-comment'>-- | /O(n)/ 'dropWhileEnd' @p@ @t@ returns the prefix remaining after</span>
<a name="line-1016"></a><span class='hs-comment'>-- dropping characters that fail the predicate @p@ from the end of</span>
<a name="line-1017"></a><span class='hs-comment'>-- @t@. Subject to fusion.</span>
<a name="line-1018"></a><span class='hs-comment'>-- Examples:</span>
<a name="line-1019"></a><span class='hs-comment'>--</span>
<a name="line-1020"></a><span class='hs-comment'>-- > dropWhileEnd (=='.') "foo..." == "foo"</span>
<a name="line-1021"></a><span class='hs-definition'>dropWhileEnd</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-1022"></a><span class='hs-definition'>dropWhileEnd</span> <span class='hs-varid'>p</span> <span class='hs-varid'>t</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>len</span>
<a name="line-1023"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>loop</span> <span class='hs-varop'>!</span><span class='hs-varid'>i</span> <span class='hs-varop'>!</span><span class='hs-varid'>l</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>l</span> <span class='hs-varop'><=</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>empty</span>
<a name="line-1024"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>p</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-varop'>+</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-varop'>+</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span>
<a name="line-1025"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>l</span>
<a name="line-1026"></a> <span class='hs-keyword'>where</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-layout'>,</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>reverseIter</span> <span class='hs-varid'>t</span> <span class='hs-varid'>i</span>
<a name="line-1027"></a><span class='hs-comment'>{-# INLINE [1] dropWhileEnd #-}</span>
<a name="line-1028"></a>
<a name="line-1029"></a><span class='hs-comment'>{-# RULES
<a name="line-1030"></a>"TEXT dropWhileEnd -> fused" [~1] forall p t.
<a name="line-1031"></a> dropWhileEnd p t = S.reverse (S.dropWhile p (S.reverseStream t))
<a name="line-1032"></a>"TEXT dropWhileEnd -> unfused" [1] forall p t.
<a name="line-1033"></a> S.reverse (S.dropWhile p (S.reverseStream t)) = dropWhileEnd p t
<a name="line-1034"></a> #-}</span>
<a name="line-1035"></a>
<a name="line-1036"></a><a name="dropAround"></a><span class='hs-comment'>-- | /O(n)/ 'dropAround' @p@ @t@ returns the substring remaining after</span>
<a name="line-1037"></a><span class='hs-comment'>-- dropping characters that fail the predicate @p@ from both the</span>
<a name="line-1038"></a><span class='hs-comment'>-- beginning and end of @t@. Subject to fusion.</span>
<a name="line-1039"></a><span class='hs-definition'>dropAround</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-1040"></a><span class='hs-definition'>dropAround</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dropWhile</span> <span class='hs-varid'>p</span> <span class='hs-varop'>.</span> <span class='hs-varid'>dropWhileEnd</span> <span class='hs-varid'>p</span>
<a name="line-1041"></a><span class='hs-comment'>{-# INLINE [1] dropAround #-}</span>
<a name="line-1042"></a>
<a name="line-1043"></a><a name="stripStart"></a><span class='hs-comment'>-- | /O(n)/ Remove leading white space from a string. Equivalent to:</span>
<a name="line-1044"></a><span class='hs-comment'>--</span>
<a name="line-1045"></a><span class='hs-comment'>-- > dropWhile isSpace</span>
<a name="line-1046"></a><span class='hs-definition'>stripStart</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-1047"></a><span class='hs-definition'>stripStart</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dropWhile</span> <span class='hs-varid'>isSpace</span>
<a name="line-1048"></a><span class='hs-comment'>{-# INLINE [1] stripStart #-}</span>
<a name="line-1049"></a>
<a name="line-1050"></a><a name="stripEnd"></a><span class='hs-comment'>-- | /O(n)/ Remove trailing white space from a string. Equivalent to:</span>
<a name="line-1051"></a><span class='hs-comment'>--</span>
<a name="line-1052"></a><span class='hs-comment'>-- > dropWhileEnd isSpace</span>
<a name="line-1053"></a><span class='hs-definition'>stripEnd</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-1054"></a><span class='hs-definition'>stripEnd</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dropWhileEnd</span> <span class='hs-varid'>isSpace</span>
<a name="line-1055"></a><span class='hs-comment'>{-# INLINE [1] stripEnd #-}</span>
<a name="line-1056"></a>
<a name="line-1057"></a><a name="strip"></a><span class='hs-comment'>-- | /O(n)/ Remove leading and trailing white space from a string.</span>
<a name="line-1058"></a><span class='hs-comment'>-- Equivalent to:</span>
<a name="line-1059"></a><span class='hs-comment'>--</span>
<a name="line-1060"></a><span class='hs-comment'>-- > dropAround isSpace</span>
<a name="line-1061"></a><span class='hs-definition'>strip</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-1062"></a><span class='hs-definition'>strip</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dropAround</span> <span class='hs-varid'>isSpace</span>
<a name="line-1063"></a><span class='hs-comment'>{-# INLINE [1] strip #-}</span>
<a name="line-1064"></a>
<a name="line-1065"></a><a name="splitAt"></a><span class='hs-comment'>-- | /O(n)/ 'splitAt' @n t@ returns a pair whose first element is a</span>
<a name="line-1066"></a><span class='hs-comment'>-- prefix of @t@ of length @n@, and whose second is the remainder of</span>
<a name="line-1067"></a><span class='hs-comment'>-- the string. It is equivalent to @('take' n t, 'drop' n t)@.</span>
<a name="line-1068"></a><span class='hs-definition'>splitAt</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span><span class='hs-layout'>,</span> <span class='hs-conid'>Text</span><span class='hs-layout'>)</span>
<a name="line-1069"></a><span class='hs-definition'>splitAt</span> <span class='hs-varid'>n</span> <span class='hs-varid'>t</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span>
<a name="line-1070"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'><=</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>empty</span><span class='hs-layout'>,</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-1071"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>len</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>t</span><span class='hs-layout'>,</span> <span class='hs-varid'>empty</span><span class='hs-layout'>)</span>
<a name="line-1072"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>k</span><span class='hs-layout'>,</span> <span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-layout'>(</span><span class='hs-varid'>off</span><span class='hs-varop'>+</span><span class='hs-varid'>k</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span><span class='hs-comment'>-</span><span class='hs-varid'>k</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-1073"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span>
<a name="line-1074"></a> <span class='hs-varid'>loop</span> <span class='hs-varop'>!</span><span class='hs-varid'>i</span> <span class='hs-varop'>!</span><span class='hs-varid'>cnt</span>
<a name="line-1075"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>i</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>len</span> <span class='hs-varop'>||</span> <span class='hs-varid'>cnt</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>i</span>
<a name="line-1076"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-varop'>+</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>cnt</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-1077"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iter_</span> <span class='hs-varid'>t</span> <span class='hs-varid'>i</span>
<a name="line-1078"></a><span class='hs-comment'>{-# INLINE splitAt #-}</span>
<a name="line-1079"></a>
<a name="line-1080"></a><a name="span"></a><span class='hs-comment'>-- | /O(n)/ 'span', applied to a predicate @p@ and text @t@, returns</span>
<a name="line-1081"></a><span class='hs-comment'>-- a pair whose first element is the longest prefix (possibly empty)</span>
<a name="line-1082"></a><span class='hs-comment'>-- of @t@ of elements that satisfy @p@, and whose second is the</span>
<a name="line-1083"></a><span class='hs-comment'>-- remainder of the list.</span>
<a name="line-1084"></a><span class='hs-definition'>span</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span><span class='hs-layout'>,</span> <span class='hs-conid'>Text</span><span class='hs-layout'>)</span>
<a name="line-1085"></a><span class='hs-definition'>span</span> <span class='hs-varid'>p</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>span_</span> <span class='hs-varid'>p</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>of</span>
<a name="line-1086"></a> <span class='hs-layout'>(</span><span class='hs-cpp'>#</span> <span class='hs-varid'>hd</span><span class='hs-layout'>,</span><span class='hs-varid'>tl</span> <span class='hs-cpp'>#</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>hd</span><span class='hs-layout'>,</span><span class='hs-varid'>tl</span><span class='hs-layout'>)</span>
<a name="line-1087"></a><span class='hs-comment'>{-# INLINE span #-}</span>
<a name="line-1088"></a>
<a name="line-1089"></a><a name="break"></a><span class='hs-comment'>-- | /O(n)/ 'break' is like 'span', but the prefix returned is</span>
<a name="line-1090"></a><span class='hs-comment'>-- over elements that fail the predicate @p@.</span>
<a name="line-1091"></a><span class='hs-definition'>break</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span><span class='hs-layout'>,</span> <span class='hs-conid'>Text</span><span class='hs-layout'>)</span>
<a name="line-1092"></a><span class='hs-definition'>break</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>span</span> <span class='hs-layout'>(</span><span class='hs-varid'>not</span> <span class='hs-varop'>.</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-1093"></a><span class='hs-comment'>{-# INLINE break #-}</span>
<a name="line-1094"></a>
<a name="line-1095"></a><a name="groupBy"></a><span class='hs-comment'>-- | /O(n)/ Group characters in a string according to a predicate.</span>
<a name="line-1096"></a><span class='hs-definition'>groupBy</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Text</span><span class='hs-keyglyph'>]</span>
<a name="line-1097"></a><span class='hs-definition'>groupBy</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span>
<a name="line-1098"></a> <span class='hs-keyword'>where</span>
<a name="line-1099"></a> <span class='hs-varid'>loop</span> <span class='hs-varid'>t</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span>
<a name="line-1100"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>null</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-1101"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>n</span> <span class='hs-conop'>:</span> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>text</span> <span class='hs-varid'>arr</span> <span class='hs-layout'>(</span><span class='hs-varid'>off</span><span class='hs-varop'>+</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span><span class='hs-comment'>-</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-1102"></a> <span class='hs-keyword'>where</span> <span class='hs-conid'>Iter</span> <span class='hs-varid'>c</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iter</span> <span class='hs-varid'>t</span> <span class='hs-num'>0</span>
<a name="line-1103"></a> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>d</span> <span class='hs-varop'>+</span> <span class='hs-varid'>findAIndexOrEnd</span> <span class='hs-layout'>(</span><span class='hs-varid'>not</span> <span class='hs-varop'>.</span> <span class='hs-varid'>p</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-layout'>(</span><span class='hs-varid'>off</span><span class='hs-varop'>+</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span><span class='hs-comment'>-</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-1104"></a>
<a name="line-1105"></a><a name="findAIndexOrEnd"></a><span class='hs-comment'>-- | Returns the /array/ index (in units of 'Word16') at which a</span>
<a name="line-1106"></a><span class='hs-comment'>-- character may be found. This is /not/ the same as the logical</span>
<a name="line-1107"></a><span class='hs-comment'>-- index returned by e.g. 'findIndex'.</span>
<a name="line-1108"></a><span class='hs-definition'>findAIndexOrEnd</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-1109"></a><span class='hs-definition'>findAIndexOrEnd</span> <span class='hs-varid'>q</span> <span class='hs-varid'>t</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-sel'>_arr</span> <span class='hs-sel'>_off</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span> <span class='hs-num'>0</span>
<a name="line-1110"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>go</span> <span class='hs-varop'>!</span><span class='hs-varid'>i</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>i</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>len</span> <span class='hs-varop'>||</span> <span class='hs-varid'>q</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>i</span>
<a name="line-1111"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-varop'>+</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span>
<a name="line-1112"></a> <span class='hs-keyword'>where</span> <span class='hs-conid'>Iter</span> <span class='hs-varid'>c</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iter</span> <span class='hs-varid'>t</span> <span class='hs-varid'>i</span>
<a name="line-1113"></a>
<a name="line-1114"></a><a name="group"></a><span class='hs-comment'>-- | /O(n)/ Group characters in a string by equality.</span>
<a name="line-1115"></a><span class='hs-definition'>group</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Text</span><span class='hs-keyglyph'>]</span>
<a name="line-1116"></a><span class='hs-definition'>group</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>groupBy</span> <span class='hs-layout'>(</span><span class='hs-varop'>==</span><span class='hs-layout'>)</span>
<a name="line-1117"></a>
<a name="line-1118"></a><a name="inits"></a><span class='hs-comment'>-- | /O(n)/ Return all initial segments of the given 'Text', shortest</span>
<a name="line-1119"></a><span class='hs-comment'>-- first.</span>
<a name="line-1120"></a><span class='hs-definition'>inits</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Text</span><span class='hs-keyglyph'>]</span>
<a name="line-1121"></a><span class='hs-definition'>inits</span> <span class='hs-varid'>t</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-num'>0</span>
<a name="line-1122"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>loop</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>i</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>len</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>t</span><span class='hs-keyglyph'>]</span>
<a name="line-1123"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>i</span> <span class='hs-conop'>:</span> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span> <span class='hs-varop'>+</span> <span class='hs-varid'>iter_</span> <span class='hs-varid'>t</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span>
<a name="line-1124"></a>
<a name="line-1125"></a><a name="tails"></a><span class='hs-comment'>-- | /O(n)/ Return all final segments of the given 'Text', longest</span>
<a name="line-1126"></a><span class='hs-comment'>-- first.</span>
<a name="line-1127"></a><span class='hs-definition'>tails</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Text</span><span class='hs-keyglyph'>]</span>
<a name="line-1128"></a><span class='hs-definition'>tails</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>null</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>empty</span><span class='hs-keyglyph'>]</span>
<a name="line-1129"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>t</span> <span class='hs-conop'>:</span> <span class='hs-varid'>tails</span> <span class='hs-layout'>(</span><span class='hs-varid'>unsafeTail</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-1130"></a>
<a name="line-1131"></a><span class='hs-comment'>-- $split</span>
<a name="line-1132"></a><span class='hs-comment'>--</span>
<a name="line-1133"></a><span class='hs-comment'>-- Splitting functions in this library do not perform character-wise</span>
<a name="line-1134"></a><span class='hs-comment'>-- copies to create substrings; they just construct new 'Text's that</span>
<a name="line-1135"></a><span class='hs-comment'>-- are slices of the original.</span>
<a name="line-1136"></a>
<a name="line-1137"></a><a name="splitOn"></a><span class='hs-comment'>-- | /O(m+n)/ Break a 'Text' into pieces separated by the first</span>
<a name="line-1138"></a><span class='hs-comment'>-- 'Text' argument, consuming the delimiter. An empty delimiter is</span>
<a name="line-1139"></a><span class='hs-comment'>-- invalid, and will cause an error to be raised.</span>
<a name="line-1140"></a><span class='hs-comment'>--</span>
<a name="line-1141"></a><span class='hs-comment'>-- Examples:</span>
<a name="line-1142"></a><span class='hs-comment'>--</span>
<a name="line-1143"></a><span class='hs-comment'>-- > splitOn "\r\n" "a\r\nb\r\nd\r\ne" == ["a","b","d","e"]</span>
<a name="line-1144"></a><span class='hs-comment'>-- > splitOn "aaa" "aaaXaaaXaaaXaaa" == ["","X","X","X",""]</span>
<a name="line-1145"></a><span class='hs-comment'>-- > splitOn "x" "x" == ["",""]</span>
<a name="line-1146"></a><span class='hs-comment'>-- </span>
<a name="line-1147"></a><span class='hs-comment'>-- and</span>
<a name="line-1148"></a><span class='hs-comment'>--</span>
<a name="line-1149"></a><span class='hs-comment'>-- > intercalate s . splitOn s == id</span>
<a name="line-1150"></a><span class='hs-comment'>-- > splitOn (singleton c) == split (==c)</span>
<a name="line-1151"></a><span class='hs-comment'>--</span>
<a name="line-1152"></a><span class='hs-comment'>-- In (unlikely) bad cases, this function's time complexity degrades</span>
<a name="line-1153"></a><span class='hs-comment'>-- towards /O(n*m)/.</span>
<a name="line-1154"></a><span class='hs-definition'>splitOn</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Text</span><span class='hs-keyglyph'>]</span>
<a name="line-1155"></a><span class='hs-definition'>splitOn</span> <span class='hs-varid'>pat</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-varid'>src</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span>
<a name="line-1156"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>l</span> <span class='hs-varop'><=</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>emptyError</span> <span class='hs-str'>"splitOn"</span>
<a name="line-1157"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isSingleton</span> <span class='hs-varid'>pat</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>split</span> <span class='hs-layout'>(</span><span class='hs-varop'>==</span> <span class='hs-varid'>unsafeHead</span> <span class='hs-varid'>pat</span><span class='hs-layout'>)</span> <span class='hs-varid'>src</span>
<a name="line-1158"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span> <span class='hs-num'>0</span> <span class='hs-layout'>(</span><span class='hs-varid'>indices</span> <span class='hs-varid'>pat</span> <span class='hs-varid'>src</span><span class='hs-layout'>)</span>
<a name="line-1159"></a> <span class='hs-keyword'>where</span>
<a name="line-1160"></a> <span class='hs-varid'>go</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>textP</span> <span class='hs-varid'>arr</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-varop'>+</span><span class='hs-varid'>off</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-comment'>-</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-conop'>:</span> <span class='hs-varid'>go</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-varop'>+</span><span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-varid'>xs</span>
<a name="line-1161"></a> <span class='hs-varid'>go</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>textP</span> <span class='hs-varid'>arr</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-varop'>+</span><span class='hs-varid'>off</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span><span class='hs-comment'>-</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-1162"></a><span class='hs-comment'>{-# INLINE [1] splitOn #-}</span>
<a name="line-1163"></a>
<a name="line-1164"></a><span class='hs-comment'>{-# RULES
<a name="line-1165"></a>"TEXT splitOn/singleton -> split/==" [~1] forall c t.
<a name="line-1166"></a> splitOn (singleton c) t = split (==c) t
<a name="line-1167"></a> #-}</span>
<a name="line-1168"></a>
<a name="line-1169"></a><a name="split"></a><span class='hs-comment'>-- | /O(n)/ Splits a 'Text' into components delimited by separators,</span>
<a name="line-1170"></a><span class='hs-comment'>-- where the predicate returns True for a separator element. The</span>
<a name="line-1171"></a><span class='hs-comment'>-- resulting components do not contain the separators. Two adjacent</span>
<a name="line-1172"></a><span class='hs-comment'>-- separators result in an empty component in the output. eg.</span>
<a name="line-1173"></a><span class='hs-comment'>--</span>
<a name="line-1174"></a><span class='hs-comment'>-- > split (=='a') "aabbaca" == ["","","bb","c",""]</span>
<a name="line-1175"></a><span class='hs-comment'>-- > split (=='a') "" == [""]</span>
<a name="line-1176"></a><span class='hs-definition'>split</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Text</span><span class='hs-keyglyph'>]</span>
<a name="line-1177"></a><span class='hs-definition'>split</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>t</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-sel'>_off</span> <span class='hs-sel'>_arr</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>t</span><span class='hs-keyglyph'>]</span>
<a name="line-1178"></a><span class='hs-definition'>split</span> <span class='hs-varid'>p</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-varid'>t</span>
<a name="line-1179"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>loop</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>null</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>l</span><span class='hs-keyglyph'>]</span>
<a name="line-1180"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>l</span> <span class='hs-conop'>:</span> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>unsafeTail</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-1181"></a> <span class='hs-keyword'>where</span> <span class='hs-layout'>(</span><span class='hs-cpp'>#</span> <span class='hs-varid'>l</span><span class='hs-layout'>,</span> <span class='hs-varid'>s'</span> <span class='hs-cpp'>#</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>span_</span> <span class='hs-layout'>(</span><span class='hs-varid'>not</span> <span class='hs-varop'>.</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span>
<a name="line-1182"></a><span class='hs-comment'>{-# INLINE split #-}</span>
<a name="line-1183"></a>
<a name="line-1184"></a><a name="chunksOf"></a><span class='hs-comment'>-- | /O(n)/ Splits a 'Text' into components of length @k@. The last</span>
<a name="line-1185"></a><span class='hs-comment'>-- element may be shorter than the other chunks, depending on the</span>
<a name="line-1186"></a><span class='hs-comment'>-- length of the input. Examples:</span>
<a name="line-1187"></a><span class='hs-comment'>--</span>
<a name="line-1188"></a><span class='hs-comment'>-- > chunksOf 3 "foobarbaz" == ["foo","bar","baz"]</span>
<a name="line-1189"></a><span class='hs-comment'>-- > chunksOf 4 "haskell.org" == ["hask","ell.","org"]</span>
<a name="line-1190"></a><span class='hs-definition'>chunksOf</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Text</span><span class='hs-keyglyph'>]</span>
<a name="line-1191"></a><span class='hs-definition'>chunksOf</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span>
<a name="line-1192"></a> <span class='hs-keyword'>where</span>
<a name="line-1193"></a> <span class='hs-varid'>go</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>splitAt</span> <span class='hs-varid'>k</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>of</span>
<a name="line-1194"></a> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>null</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>[]</span>
<a name="line-1195"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-conop'>:</span> <span class='hs-varid'>go</span> <span class='hs-varid'>b</span>
<a name="line-1196"></a><span class='hs-comment'>{-# INLINE chunksOf #-}</span>
<a name="line-1197"></a>
<a name="line-1198"></a><span class='hs-comment'>-- ----------------------------------------------------------------------------</span>
<a name="line-1199"></a><span class='hs-comment'>-- * Searching</span>
<a name="line-1200"></a>
<a name="line-1201"></a><span class='hs-comment'>-------------------------------------------------------------------------------</span>
<a name="line-1202"></a><span class='hs-comment'>-- ** Searching with a predicate</span>
<a name="line-1203"></a>
<a name="line-1204"></a><a name="find"></a><span class='hs-comment'>-- | /O(n)/ The 'find' function takes a predicate and a 'Text', and</span>
<a name="line-1205"></a><span class='hs-comment'>-- returns the first element matching the predicate, or 'Nothing' if</span>
<a name="line-1206"></a><span class='hs-comment'>-- there is no such element.</span>
<a name="line-1207"></a><span class='hs-definition'>find</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Char</span>
<a name="line-1208"></a><span class='hs-definition'>find</span> <span class='hs-varid'>p</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>findBy</span> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-1209"></a><span class='hs-comment'>{-# INLINE find #-}</span>
<a name="line-1210"></a>
<a name="line-1211"></a><a name="partition"></a><span class='hs-comment'>-- | /O(n)/ The 'partition' function takes a predicate and a 'Text',</span>
<a name="line-1212"></a><span class='hs-comment'>-- and returns the pair of 'Text's with elements which do and do not</span>
<a name="line-1213"></a><span class='hs-comment'>-- satisfy the predicate, respectively; i.e.</span>
<a name="line-1214"></a><span class='hs-comment'>--</span>
<a name="line-1215"></a><span class='hs-comment'>-- > partition p t == (filter p t, filter (not . p) t)</span>
<a name="line-1216"></a><span class='hs-definition'>partition</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span><span class='hs-layout'>,</span> <span class='hs-conid'>Text</span><span class='hs-layout'>)</span>
<a name="line-1217"></a><span class='hs-definition'>partition</span> <span class='hs-varid'>p</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>filter</span> <span class='hs-varid'>p</span> <span class='hs-varid'>t</span><span class='hs-layout'>,</span> <span class='hs-varid'>filter</span> <span class='hs-layout'>(</span><span class='hs-varid'>not</span> <span class='hs-varop'>.</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-1218"></a><span class='hs-comment'>{-# INLINE partition #-}</span>
<a name="line-1219"></a>
<a name="line-1220"></a><a name="filter"></a><span class='hs-comment'>-- | /O(n)/ 'filter', applied to a predicate and a 'Text',</span>
<a name="line-1221"></a><span class='hs-comment'>-- returns a 'Text' containing those characters that satisfy the</span>
<a name="line-1222"></a><span class='hs-comment'>-- predicate.</span>
<a name="line-1223"></a><span class='hs-definition'>filter</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-1224"></a><span class='hs-definition'>filter</span> <span class='hs-varid'>p</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unstream</span> <span class='hs-layout'>(</span><span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>filter</span> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-1225"></a><span class='hs-comment'>{-# INLINE filter #-}</span>
<a name="line-1226"></a>
<a name="line-1227"></a><a name="breakOn"></a><span class='hs-comment'>-- | /O(n+m)/ Find the first instance of @needle@ (which must be</span>
<a name="line-1228"></a><span class='hs-comment'>-- non-'null') in @haystack@. The first element of the returned tuple</span>
<a name="line-1229"></a><span class='hs-comment'>-- is the prefix of @haystack@ before @needle@ is matched. The second</span>
<a name="line-1230"></a><span class='hs-comment'>-- is the remainder of @haystack@, starting with the match.</span>
<a name="line-1231"></a><span class='hs-comment'>--</span>
<a name="line-1232"></a><span class='hs-comment'>-- Examples:</span>
<a name="line-1233"></a><span class='hs-comment'>--</span>
<a name="line-1234"></a><span class='hs-comment'>-- > breakOn "::" "a::b::c" ==> ("a", "::b::c")</span>
<a name="line-1235"></a><span class='hs-comment'>-- > breakOn "/" "foobar" ==> ("foobar", "")</span>
<a name="line-1236"></a><span class='hs-comment'>--</span>
<a name="line-1237"></a><span class='hs-comment'>-- Laws:</span>
<a name="line-1238"></a><span class='hs-comment'>--</span>
<a name="line-1239"></a><span class='hs-comment'>-- > append prefix match == haystack</span>
<a name="line-1240"></a><span class='hs-comment'>-- > where (prefix, match) = breakOn needle haystack</span>
<a name="line-1241"></a><span class='hs-comment'>--</span>
<a name="line-1242"></a><span class='hs-comment'>-- If you need to break a string by a substring repeatedly (e.g. you</span>
<a name="line-1243"></a><span class='hs-comment'>-- want to break on every instance of a substring), use 'breakOnAll'</span>
<a name="line-1244"></a><span class='hs-comment'>-- instead, as it has lower startup overhead.</span>
<a name="line-1245"></a><span class='hs-comment'>--</span>
<a name="line-1246"></a><span class='hs-comment'>-- In (unlikely) bad cases, this function's time complexity degrades</span>
<a name="line-1247"></a><span class='hs-comment'>-- towards /O(n*m)/.</span>
<a name="line-1248"></a><span class='hs-definition'>breakOn</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span><span class='hs-layout'>,</span> <span class='hs-conid'>Text</span><span class='hs-layout'>)</span>
<a name="line-1249"></a><span class='hs-definition'>breakOn</span> <span class='hs-varid'>pat</span> <span class='hs-varid'>src</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span>
<a name="line-1250"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>null</span> <span class='hs-varid'>pat</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>emptyError</span> <span class='hs-str'>"breakOn"</span>
<a name="line-1251"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>indices</span> <span class='hs-varid'>pat</span> <span class='hs-varid'>src</span> <span class='hs-keyword'>of</span>
<a name="line-1252"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>src</span><span class='hs-layout'>,</span> <span class='hs-varid'>empty</span><span class='hs-layout'>)</span>
<a name="line-1253"></a> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>textP</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>textP</span> <span class='hs-varid'>arr</span> <span class='hs-layout'>(</span><span class='hs-varid'>off</span><span class='hs-varop'>+</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span><span class='hs-comment'>-</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-1254"></a><span class='hs-comment'>{-# INLINE breakOn #-}</span>
<a name="line-1255"></a>
<a name="line-1256"></a><a name="breakOnEnd"></a><span class='hs-comment'>-- | /O(n+m)/ Similar to 'breakOn', but searches from the end of the</span>
<a name="line-1257"></a><span class='hs-comment'>-- string.</span>
<a name="line-1258"></a><span class='hs-comment'>--</span>
<a name="line-1259"></a><span class='hs-comment'>-- The first element of the returned tuple is the prefix of @haystack@</span>
<a name="line-1260"></a><span class='hs-comment'>-- up to and including the last match of @needle@. The second is the</span>
<a name="line-1261"></a><span class='hs-comment'>-- remainder of @haystack@, following the match.</span>
<a name="line-1262"></a><span class='hs-comment'>--</span>
<a name="line-1263"></a><span class='hs-comment'>-- > breakOnEnd "::" "a::b::c" ==> ("a::b::", "c")</span>
<a name="line-1264"></a><span class='hs-definition'>breakOnEnd</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span><span class='hs-layout'>,</span> <span class='hs-conid'>Text</span><span class='hs-layout'>)</span>
<a name="line-1265"></a><span class='hs-definition'>breakOnEnd</span> <span class='hs-varid'>pat</span> <span class='hs-varid'>src</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>reverse</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-varid'>reverse</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-1266"></a> <span class='hs-keyword'>where</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>breakOn</span> <span class='hs-layout'>(</span><span class='hs-varid'>reverse</span> <span class='hs-varid'>pat</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>reverse</span> <span class='hs-varid'>src</span><span class='hs-layout'>)</span>
<a name="line-1267"></a><span class='hs-comment'>{-# INLINE breakOnEnd #-}</span>
<a name="line-1268"></a>
<a name="line-1269"></a><a name="breakOnAll"></a><span class='hs-comment'>-- | /O(n+m)/ Find all non-overlapping instances of @needle@ in</span>
<a name="line-1270"></a><span class='hs-comment'>-- @haystack@. Each element of the returned list consists of a pair:</span>
<a name="line-1271"></a><span class='hs-comment'>--</span>
<a name="line-1272"></a><span class='hs-comment'>-- * The entire string prior to the /k/th match (i.e. the prefix)</span>
<a name="line-1273"></a><span class='hs-comment'>--</span>
<a name="line-1274"></a><span class='hs-comment'>-- * The /k/th match, followed by the remainder of the string</span>
<a name="line-1275"></a><span class='hs-comment'>--</span>
<a name="line-1276"></a><span class='hs-comment'>-- Examples:</span>
<a name="line-1277"></a><span class='hs-comment'>--</span>
<a name="line-1278"></a><span class='hs-comment'>-- > breakOnAll "::" ""</span>
<a name="line-1279"></a><span class='hs-comment'>-- > ==> []</span>
<a name="line-1280"></a><span class='hs-comment'>-- > breakOnAll "/" "a/b/c/"</span>
<a name="line-1281"></a><span class='hs-comment'>-- > ==> [("a", "/b/c/"), ("a/b", "/c/"), ("a/b/c", "/")]</span>
<a name="line-1282"></a><span class='hs-comment'>--</span>
<a name="line-1283"></a><span class='hs-comment'>-- In (unlikely) bad cases, this function's time complexity degrades</span>
<a name="line-1284"></a><span class='hs-comment'>-- towards /O(n*m)/.</span>
<a name="line-1285"></a><span class='hs-comment'>--</span>
<a name="line-1286"></a><span class='hs-comment'>-- The @needle@ parameter may not be empty.</span>
<a name="line-1287"></a><span class='hs-definition'>breakOnAll</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-comment'>-- ^ @needle@ to search for</span>
<a name="line-1288"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-comment'>-- ^ @haystack@ in which to search</span>
<a name="line-1289"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span><span class='hs-layout'>,</span> <span class='hs-conid'>Text</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-1290"></a><span class='hs-definition'>breakOnAll</span> <span class='hs-varid'>pat</span> <span class='hs-varid'>src</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>slen</span><span class='hs-layout'>)</span>
<a name="line-1291"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>null</span> <span class='hs-varid'>pat</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>emptyError</span> <span class='hs-str'>"breakOnAll"</span>
<a name="line-1292"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>L</span><span class='hs-varop'>.</span><span class='hs-varid'>map</span> <span class='hs-varid'>step</span> <span class='hs-layout'>(</span><span class='hs-varid'>indices</span> <span class='hs-varid'>pat</span> <span class='hs-varid'>src</span><span class='hs-layout'>)</span>
<a name="line-1293"></a> <span class='hs-keyword'>where</span>
<a name="line-1294"></a> <span class='hs-varid'>step</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>chunk</span> <span class='hs-num'>0</span> <span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>chunk</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-varid'>slen</span><span class='hs-comment'>-</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-1295"></a> <span class='hs-varid'>chunk</span> <span class='hs-varop'>!</span><span class='hs-varid'>n</span> <span class='hs-varop'>!</span><span class='hs-varid'>l</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>textP</span> <span class='hs-varid'>arr</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-varop'>+</span><span class='hs-varid'>off</span><span class='hs-layout'>)</span> <span class='hs-varid'>l</span>
<a name="line-1296"></a><span class='hs-comment'>{-# INLINE breakOnAll #-}</span>
<a name="line-1297"></a>
<a name="line-1298"></a><span class='hs-comment'>-------------------------------------------------------------------------------</span>
<a name="line-1299"></a><span class='hs-comment'>-- ** Indexing 'Text's</span>
<a name="line-1300"></a>
<a name="line-1301"></a><span class='hs-comment'>-- $index</span>
<a name="line-1302"></a><span class='hs-comment'>--</span>
<a name="line-1303"></a><span class='hs-comment'>-- If you think of a 'Text' value as an array of 'Char' values (which</span>
<a name="line-1304"></a><span class='hs-comment'>-- it is not), you run the risk of writing inefficient code.</span>
<a name="line-1305"></a><span class='hs-comment'>--</span>
<a name="line-1306"></a><span class='hs-comment'>-- An idiom that is common in some languages is to find the numeric</span>
<a name="line-1307"></a><span class='hs-comment'>-- offset of a character or substring, then use that number to split</span>
<a name="line-1308"></a><span class='hs-comment'>-- or trim the searched string. With a 'Text' value, this approach</span>
<a name="line-1309"></a><span class='hs-comment'>-- would require two /O(n)/ operations: one to perform the search, and</span>
<a name="line-1310"></a><span class='hs-comment'>-- one to operate from wherever the search ended.</span>
<a name="line-1311"></a><span class='hs-comment'>--</span>
<a name="line-1312"></a><span class='hs-comment'>-- For example, suppose you have a string that you want to split on</span>
<a name="line-1313"></a><span class='hs-comment'>-- the substring @\"::\"@, such as @\"foo::bar::quux\"@. Instead of</span>
<a name="line-1314"></a><span class='hs-comment'>-- searching for the index of @\"::\"@ and taking the substrings</span>
<a name="line-1315"></a><span class='hs-comment'>-- before and after that index, you would instead use @breakOnAll \"::\"@.</span>
<a name="line-1316"></a>
<a name="line-1317"></a><a name="index"></a><span class='hs-comment'>-- | /O(n)/ 'Text' index (subscript) operator, starting from 0.</span>
<a name="line-1318"></a><span class='hs-definition'>index</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span>
<a name="line-1319"></a><span class='hs-definition'>index</span> <span class='hs-varid'>t</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>index</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-varid'>n</span>
<a name="line-1320"></a><span class='hs-comment'>{-# INLINE index #-}</span>
<a name="line-1321"></a>
<a name="line-1322"></a><a name="findIndex"></a><span class='hs-comment'>-- | /O(n)/ The 'findIndex' function takes a predicate and a 'Text'</span>
<a name="line-1323"></a><span class='hs-comment'>-- and returns the index of the first element in the 'Text' satisfying</span>
<a name="line-1324"></a><span class='hs-comment'>-- the predicate. Subject to fusion.</span>
<a name="line-1325"></a><span class='hs-definition'>findIndex</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Int</span>
<a name="line-1326"></a><span class='hs-definition'>findIndex</span> <span class='hs-varid'>p</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>findIndex</span> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-1327"></a><span class='hs-comment'>{-# INLINE findIndex #-}</span>
<a name="line-1328"></a>
<a name="line-1329"></a><a name="count"></a><span class='hs-comment'>-- | /O(n+m)/ The 'count' function returns the number of times the</span>
<a name="line-1330"></a><span class='hs-comment'>-- query string appears in the given 'Text'. An empty query string is</span>
<a name="line-1331"></a><span class='hs-comment'>-- invalid, and will cause an error to be raised.</span>
<a name="line-1332"></a><span class='hs-comment'>--</span>
<a name="line-1333"></a><span class='hs-comment'>-- In (unlikely) bad cases, this function's time complexity degrades</span>
<a name="line-1334"></a><span class='hs-comment'>-- towards /O(n*m)/.</span>
<a name="line-1335"></a><span class='hs-definition'>count</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-1336"></a><span class='hs-definition'>count</span> <span class='hs-varid'>pat</span> <span class='hs-varid'>src</span>
<a name="line-1337"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>null</span> <span class='hs-varid'>pat</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>emptyError</span> <span class='hs-str'>"count"</span>
<a name="line-1338"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isSingleton</span> <span class='hs-varid'>pat</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>countChar</span> <span class='hs-layout'>(</span><span class='hs-varid'>unsafeHead</span> <span class='hs-varid'>pat</span><span class='hs-layout'>)</span> <span class='hs-varid'>src</span>
<a name="line-1339"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>L</span><span class='hs-varop'>.</span><span class='hs-varid'>length</span> <span class='hs-layout'>(</span><span class='hs-varid'>indices</span> <span class='hs-varid'>pat</span> <span class='hs-varid'>src</span><span class='hs-layout'>)</span>
<a name="line-1340"></a><span class='hs-comment'>{-# INLINE [1] count #-}</span>
<a name="line-1341"></a>
<a name="line-1342"></a><span class='hs-comment'>{-# RULES
<a name="line-1343"></a>"TEXT count/singleton -> countChar" [~1] forall c t.
<a name="line-1344"></a> count (singleton c) t = countChar c t
<a name="line-1345"></a> #-}</span>
<a name="line-1346"></a>
<a name="line-1347"></a><a name="countChar"></a><span class='hs-comment'>-- | /O(n)/ The 'countChar' function returns the number of times the</span>
<a name="line-1348"></a><span class='hs-comment'>-- query element appears in the given 'Text'. Subject to fusion.</span>
<a name="line-1349"></a><span class='hs-definition'>countChar</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-1350"></a><span class='hs-definition'>countChar</span> <span class='hs-varid'>c</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>countChar</span> <span class='hs-varid'>c</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-1351"></a><span class='hs-comment'>{-# INLINE countChar #-}</span>
<a name="line-1352"></a>
<a name="line-1353"></a><span class='hs-comment'>-------------------------------------------------------------------------------</span>
<a name="line-1354"></a><span class='hs-comment'>-- * Zipping</span>
<a name="line-1355"></a>
<a name="line-1356"></a><a name="zip"></a><span class='hs-comment'>-- | /O(n)/ 'zip' takes two 'Text's and returns a list of</span>
<a name="line-1357"></a><span class='hs-comment'>-- corresponding pairs of bytes. If one input 'Text' is short,</span>
<a name="line-1358"></a><span class='hs-comment'>-- excess elements of the longer 'Text' are discarded. This is</span>
<a name="line-1359"></a><span class='hs-comment'>-- equivalent to a pair of 'unpack' operations.</span>
<a name="line-1360"></a><span class='hs-definition'>zip</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Char</span><span class='hs-layout'>,</span><span class='hs-conid'>Char</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-1361"></a><span class='hs-definition'>zip</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>unstreamList</span> <span class='hs-varop'>$</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>zipWith</span> <span class='hs-conid'>(,)</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-1362"></a><span class='hs-comment'>{-# INLINE [0] zip #-}</span>
<a name="line-1363"></a>
<a name="line-1364"></a><a name="zipWith"></a><span class='hs-comment'>-- | /O(n)/ 'zipWith' generalises 'zip' by zipping with the function</span>
<a name="line-1365"></a><span class='hs-comment'>-- given as the first argument, instead of a tupling function.</span>
<a name="line-1366"></a><span class='hs-comment'>-- Performs replacement on invalid scalar values.</span>
<a name="line-1367"></a><span class='hs-definition'>zipWith</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-1368"></a><span class='hs-definition'>zipWith</span> <span class='hs-varid'>f</span> <span class='hs-varid'>t1</span> <span class='hs-varid'>t2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unstream</span> <span class='hs-layout'>(</span><span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>zipWith</span> <span class='hs-varid'>g</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>t2</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-1369"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>g</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>safe</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-1370"></a><span class='hs-comment'>{-# INLINE [0] zipWith #-}</span>
<a name="line-1371"></a>
<a name="line-1372"></a><a name="words"></a><span class='hs-comment'>-- | /O(n)/ Breaks a 'Text' up into a list of words, delimited by 'Char's</span>
<a name="line-1373"></a><span class='hs-comment'>-- representing white space.</span>
<a name="line-1374"></a><span class='hs-definition'>words</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Text</span><span class='hs-keyglyph'>]</span>
<a name="line-1375"></a><span class='hs-definition'>words</span> <span class='hs-varid'>t</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span>
<a name="line-1376"></a> <span class='hs-keyword'>where</span>
<a name="line-1377"></a> <span class='hs-varid'>loop</span> <span class='hs-varop'>!</span><span class='hs-varid'>start</span> <span class='hs-varop'>!</span><span class='hs-varid'>n</span>
<a name="line-1378"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>len</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>start</span> <span class='hs-varop'>==</span> <span class='hs-varid'>n</span>
<a name="line-1379"></a> <span class='hs-keyword'>then</span> <span class='hs-conid'>[]</span>
<a name="line-1380"></a> <span class='hs-keyword'>else</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-layout'>(</span><span class='hs-varid'>start</span><span class='hs-varop'>+</span><span class='hs-varid'>off</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-comment'>-</span><span class='hs-varid'>start</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-1381"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isSpace</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span>
<a name="line-1382"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>start</span> <span class='hs-varop'>==</span> <span class='hs-varid'>n</span>
<a name="line-1383"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>start</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>start</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-1384"></a> <span class='hs-keyword'>else</span> <span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-layout'>(</span><span class='hs-varid'>start</span><span class='hs-varop'>+</span><span class='hs-varid'>off</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-comment'>-</span><span class='hs-varid'>start</span><span class='hs-layout'>)</span> <span class='hs-conop'>:</span> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-varop'>+</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-varop'>+</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span>
<a name="line-1385"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-varid'>start</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-varop'>+</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span>
<a name="line-1386"></a> <span class='hs-keyword'>where</span> <span class='hs-conid'>Iter</span> <span class='hs-varid'>c</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iter</span> <span class='hs-varid'>t</span> <span class='hs-varid'>n</span>
<a name="line-1387"></a><span class='hs-comment'>{-# INLINE words #-}</span>
<a name="line-1388"></a>
<a name="line-1389"></a><a name="lines"></a><span class='hs-comment'>-- | /O(n)/ Breaks a 'Text' up into a list of 'Text's at</span>
<a name="line-1390"></a><span class='hs-comment'>-- newline 'Char's. The resulting strings do not contain newlines.</span>
<a name="line-1391"></a><span class='hs-definition'>lines</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Text</span><span class='hs-keyglyph'>]</span>
<a name="line-1392"></a><span class='hs-definition'>lines</span> <span class='hs-varid'>ps</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>null</span> <span class='hs-varid'>ps</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-1393"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>h</span> <span class='hs-conop'>:</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>null</span> <span class='hs-varid'>t</span>
<a name="line-1394"></a> <span class='hs-keyword'>then</span> <span class='hs-conid'>[]</span>
<a name="line-1395"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>lines</span> <span class='hs-layout'>(</span><span class='hs-varid'>unsafeTail</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-1396"></a> <span class='hs-keyword'>where</span> <span class='hs-layout'>(</span><span class='hs-cpp'>#</span> <span class='hs-varid'>h</span><span class='hs-layout'>,</span><span class='hs-varid'>t</span> <span class='hs-cpp'>#</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>span_</span> <span class='hs-layout'>(</span><span class='hs-varop'>/=</span> <span class='hs-chr'>'\n'</span><span class='hs-layout'>)</span> <span class='hs-varid'>ps</span>
<a name="line-1397"></a><span class='hs-comment'>{-# INLINE lines #-}</span>
<a name="line-1398"></a>
<a name="line-1399"></a><span class='hs-comment'>{-
<a name="line-1400"></a>-- | /O(n)/ Portably breaks a 'Text' up into a list of 'Text's at line
<a name="line-1401"></a>-- boundaries.
<a name="line-1402"></a>--
<a name="line-1403"></a>-- A line boundary is considered to be either a line feed, a carriage
<a name="line-1404"></a>-- return immediately followed by a line feed, or a carriage return.
<a name="line-1405"></a>-- This accounts for both Unix and Windows line ending conventions,
<a name="line-1406"></a>-- and for the old convention used on Mac OS 9 and earlier.
<a name="line-1407"></a>lines' :: Text -> [Text]
<a name="line-1408"></a>lines' ps | null ps = []
<a name="line-1409"></a> | otherwise = h : case uncons t of
<a name="line-1410"></a> Nothing -> []
<a name="line-1411"></a> Just (c,t')
<a name="line-1412"></a> | c == '\n' -> lines t'
<a name="line-1413"></a> | c == '\r' -> case uncons t' of
<a name="line-1414"></a> Just ('\n',t'') -> lines t''
<a name="line-1415"></a> _ -> lines t'
<a name="line-1416"></a> where (h,t) = span notEOL ps
<a name="line-1417"></a> notEOL c = c /= '\n' && c /= '\r'
<a name="line-1418"></a>{-# INLINE lines' #-}
<a name="line-1419"></a>-}</span>
<a name="line-1420"></a>
<a name="line-1421"></a><a name="unlines"></a><span class='hs-comment'>-- | /O(n)/ Joins lines, after appending a terminating newline to</span>
<a name="line-1422"></a><span class='hs-comment'>-- each.</span>
<a name="line-1423"></a><span class='hs-definition'>unlines</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Text</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-1424"></a><span class='hs-definition'>unlines</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>concat</span> <span class='hs-varop'>.</span> <span class='hs-conid'>L</span><span class='hs-varop'>.</span><span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varop'>`snoc`</span> <span class='hs-chr'>'\n'</span><span class='hs-layout'>)</span>
<a name="line-1425"></a><span class='hs-comment'>{-# INLINE unlines #-}</span>
<a name="line-1426"></a>
<a name="line-1427"></a><a name="unwords"></a><span class='hs-comment'>-- | /O(n)/ Joins words using single space characters.</span>
<a name="line-1428"></a><span class='hs-definition'>unwords</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Text</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-1429"></a><span class='hs-definition'>unwords</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>intercalate</span> <span class='hs-layout'>(</span><span class='hs-varid'>singleton</span> <span class='hs-chr'>' '</span><span class='hs-layout'>)</span>
<a name="line-1430"></a><span class='hs-comment'>{-# INLINE unwords #-}</span>
<a name="line-1431"></a>
<a name="line-1432"></a><a name="isPrefixOf"></a><span class='hs-comment'>-- | /O(n)/ The 'isPrefixOf' function takes two 'Text's and returns</span>
<a name="line-1433"></a><span class='hs-comment'>-- 'True' iff the first is a prefix of the second. Subject to fusion.</span>
<a name="line-1434"></a><span class='hs-definition'>isPrefixOf</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-1435"></a><span class='hs-definition'>isPrefixOf</span> <span class='hs-varid'>a</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>alen</span><span class='hs-layout'>)</span> <span class='hs-varid'>b</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>blen</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-1436"></a> <span class='hs-varid'>alen</span> <span class='hs-varop'><=</span> <span class='hs-varid'>blen</span> <span class='hs-varop'>&&</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>isPrefixOf</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>stream</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-1437"></a><span class='hs-comment'>{-# INLINE [1] isPrefixOf #-}</span>
<a name="line-1438"></a>
<a name="line-1439"></a><span class='hs-comment'>{-# RULES
<a name="line-1440"></a>"TEXT isPrefixOf -> fused" [~1] forall s t.
<a name="line-1441"></a> isPrefixOf s t = S.isPrefixOf (stream s) (stream t)
<a name="line-1442"></a> #-}</span>
<a name="line-1443"></a>
<a name="line-1444"></a><a name="isSuffixOf"></a><span class='hs-comment'>-- | /O(n)/ The 'isSuffixOf' function takes two 'Text's and returns</span>
<a name="line-1445"></a><span class='hs-comment'>-- 'True' iff the first is a suffix of the second.</span>
<a name="line-1446"></a><span class='hs-definition'>isSuffixOf</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-1447"></a><span class='hs-definition'>isSuffixOf</span> <span class='hs-varid'>a</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-sel'>_aarr</span> <span class='hs-sel'>_aoff</span> <span class='hs-varid'>alen</span><span class='hs-layout'>)</span> <span class='hs-varid'>b</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>barr</span> <span class='hs-varid'>boff</span> <span class='hs-varid'>blen</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-1448"></a> <span class='hs-varid'>d</span> <span class='hs-varop'>>=</span> <span class='hs-num'>0</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>a</span> <span class='hs-varop'>==</span> <span class='hs-varid'>b'</span>
<a name="line-1449"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>blen</span> <span class='hs-comment'>-</span> <span class='hs-varid'>alen</span>
<a name="line-1450"></a> <span class='hs-varid'>b'</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>d</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>b</span>
<a name="line-1451"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Text</span> <span class='hs-varid'>barr</span> <span class='hs-layout'>(</span><span class='hs-varid'>boff</span><span class='hs-varop'>+</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-varid'>alen</span>
<a name="line-1452"></a><span class='hs-comment'>{-# INLINE isSuffixOf #-}</span>
<a name="line-1453"></a>
<a name="line-1454"></a><a name="isInfixOf"></a><span class='hs-comment'>-- | /O(n+m)/ The 'isInfixOf' function takes two 'Text's and returns</span>
<a name="line-1455"></a><span class='hs-comment'>-- 'True' iff the first is contained, wholly and intact, anywhere</span>
<a name="line-1456"></a><span class='hs-comment'>-- within the second.</span>
<a name="line-1457"></a><span class='hs-comment'>--</span>
<a name="line-1458"></a><span class='hs-comment'>-- In (unlikely) bad cases, this function's time complexity degrades</span>
<a name="line-1459"></a><span class='hs-comment'>-- towards /O(n*m)/.</span>
<a name="line-1460"></a><span class='hs-definition'>isInfixOf</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-1461"></a><span class='hs-definition'>isInfixOf</span> <span class='hs-varid'>needle</span> <span class='hs-varid'>haystack</span>
<a name="line-1462"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>null</span> <span class='hs-varid'>needle</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
<a name="line-1463"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isSingleton</span> <span class='hs-varid'>needle</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>elem</span> <span class='hs-layout'>(</span><span class='hs-varid'>unsafeHead</span> <span class='hs-varid'>needle</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>stream</span> <span class='hs-varop'>$</span> <span class='hs-varid'>haystack</span>
<a name="line-1464"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>not</span> <span class='hs-varop'>.</span> <span class='hs-conid'>L</span><span class='hs-varop'>.</span><span class='hs-varid'>null</span> <span class='hs-varop'>.</span> <span class='hs-varid'>indices</span> <span class='hs-varid'>needle</span> <span class='hs-varop'>$</span> <span class='hs-varid'>haystack</span>
<a name="line-1465"></a><span class='hs-comment'>{-# INLINE [1] isInfixOf #-}</span>
<a name="line-1466"></a>
<a name="line-1467"></a><span class='hs-comment'>{-# RULES
<a name="line-1468"></a>"TEXT isInfixOf/singleton -> S.elem/S.stream" [~1] forall n h.
<a name="line-1469"></a> isInfixOf (singleton n) h = S.elem n (S.stream h)
<a name="line-1470"></a> #-}</span>
<a name="line-1471"></a>
<a name="line-1472"></a><span class='hs-comment'>-------------------------------------------------------------------------------</span>
<a name="line-1473"></a><span class='hs-comment'>-- * View patterns</span>
<a name="line-1474"></a>
<a name="line-1475"></a><a name="stripPrefix"></a><span class='hs-comment'>-- | /O(n)/ Return the suffix of the second string if its prefix</span>
<a name="line-1476"></a><span class='hs-comment'>-- matches the entire first string.</span>
<a name="line-1477"></a><span class='hs-comment'>--</span>
<a name="line-1478"></a><span class='hs-comment'>-- Examples:</span>
<a name="line-1479"></a><span class='hs-comment'>--</span>
<a name="line-1480"></a><span class='hs-comment'>-- > stripPrefix "foo" "foobar" == Just "bar"</span>
<a name="line-1481"></a><span class='hs-comment'>-- > stripPrefix "" "baz" == Just "baz"</span>
<a name="line-1482"></a><span class='hs-comment'>-- > stripPrefix "foo" "quux" == Nothing</span>
<a name="line-1483"></a><span class='hs-comment'>--</span>
<a name="line-1484"></a><span class='hs-comment'>-- This is particularly useful with the @ViewPatterns@ extension to</span>
<a name="line-1485"></a><span class='hs-comment'>-- GHC, as follows:</span>
<a name="line-1486"></a><span class='hs-comment'>--</span>
<a name="line-1487"></a><span class='hs-comment'>-- > {-# LANGUAGE ViewPatterns #-}</span>
<a name="line-1488"></a><span class='hs-comment'>-- > import Data.Text as T</span>
<a name="line-1489"></a><span class='hs-comment'>-- ></span>
<a name="line-1490"></a><span class='hs-comment'>-- > fnordLength :: Text -> Int</span>
<a name="line-1491"></a><span class='hs-comment'>-- > fnordLength (stripPrefix "fnord" -> Just suf) = T.length suf</span>
<a name="line-1492"></a><span class='hs-comment'>-- > fnordLength _ = -1</span>
<a name="line-1493"></a><span class='hs-definition'>stripPrefix</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Text</span>
<a name="line-1494"></a><span class='hs-definition'>stripPrefix</span> <span class='hs-varid'>p</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-sel'>_arr</span> <span class='hs-sel'>_off</span> <span class='hs-varid'>plen</span><span class='hs-layout'>)</span> <span class='hs-varid'>t</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span>
<a name="line-1495"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>p</span> <span class='hs-varop'>`isPrefixOf`</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$!</span> <span class='hs-varid'>textP</span> <span class='hs-varid'>arr</span> <span class='hs-layout'>(</span><span class='hs-varid'>off</span><span class='hs-varop'>+</span><span class='hs-varid'>plen</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span><span class='hs-comment'>-</span><span class='hs-varid'>plen</span><span class='hs-layout'>)</span>
<a name="line-1496"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-1497"></a>
<a name="line-1498"></a><a name="commonPrefixes"></a><span class='hs-comment'>-- | /O(n)/ Find the longest non-empty common prefix of two strings</span>
<a name="line-1499"></a><span class='hs-comment'>-- and return it, along with the suffixes of each string at which they</span>
<a name="line-1500"></a><span class='hs-comment'>-- no longer match.</span>
<a name="line-1501"></a><span class='hs-comment'>--</span>
<a name="line-1502"></a><span class='hs-comment'>-- If the strings do not have a common prefix or either one is empty,</span>
<a name="line-1503"></a><span class='hs-comment'>-- this function returns 'Nothing'.</span>
<a name="line-1504"></a><span class='hs-comment'>--</span>
<a name="line-1505"></a><span class='hs-comment'>-- Examples:</span>
<a name="line-1506"></a><span class='hs-comment'>--</span>
<a name="line-1507"></a><span class='hs-comment'>-- > commonPrefixes "foobar" "fooquux" == Just ("foo","bar","quux")</span>
<a name="line-1508"></a><span class='hs-comment'>-- > commonPrefixes "veeble" "fetzer" == Nothing</span>
<a name="line-1509"></a><span class='hs-comment'>-- > commonPrefixes "" "baz" == Nothing</span>
<a name="line-1510"></a><span class='hs-definition'>commonPrefixes</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span><span class='hs-layout'>,</span><span class='hs-conid'>Text</span><span class='hs-layout'>,</span><span class='hs-conid'>Text</span><span class='hs-layout'>)</span>
<a name="line-1511"></a><span class='hs-definition'>commonPrefixes</span> <span class='hs-varid'>t0</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr0</span> <span class='hs-varid'>off0</span> <span class='hs-varid'>len0</span><span class='hs-layout'>)</span> <span class='hs-varid'>t1</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr1</span> <span class='hs-varid'>off1</span> <span class='hs-varid'>len1</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span>
<a name="line-1512"></a> <span class='hs-keyword'>where</span>
<a name="line-1513"></a> <span class='hs-varid'>go</span> <span class='hs-varop'>!</span><span class='hs-varid'>i</span> <span class='hs-varop'>!</span><span class='hs-varid'>j</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>i</span> <span class='hs-varop'><</span> <span class='hs-varid'>len0</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>j</span> <span class='hs-varop'><</span> <span class='hs-varid'>len1</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>a</span> <span class='hs-varop'>==</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-varop'>+</span><span class='hs-varid'>d0</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>j</span><span class='hs-varop'>+</span><span class='hs-varid'>d1</span><span class='hs-layout'>)</span>
<a name="line-1514"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>i</span> <span class='hs-varop'>></span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr0</span> <span class='hs-varid'>off0</span> <span class='hs-varid'>i</span><span class='hs-layout'>,</span>
<a name="line-1515"></a> <span class='hs-varid'>textP</span> <span class='hs-varid'>arr0</span> <span class='hs-layout'>(</span><span class='hs-varid'>off0</span><span class='hs-varop'>+</span><span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>len0</span><span class='hs-comment'>-</span><span class='hs-varid'>i</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-1516"></a> <span class='hs-varid'>textP</span> <span class='hs-varid'>arr1</span> <span class='hs-layout'>(</span><span class='hs-varid'>off1</span><span class='hs-varop'>+</span><span class='hs-varid'>j</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>len1</span><span class='hs-comment'>-</span><span class='hs-varid'>j</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-1517"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-1518"></a> <span class='hs-keyword'>where</span> <span class='hs-conid'>Iter</span> <span class='hs-varid'>a</span> <span class='hs-varid'>d0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iter</span> <span class='hs-varid'>t0</span> <span class='hs-varid'>i</span>
<a name="line-1519"></a> <span class='hs-conid'>Iter</span> <span class='hs-varid'>b</span> <span class='hs-varid'>d1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iter</span> <span class='hs-varid'>t1</span> <span class='hs-varid'>j</span>
<a name="line-1520"></a>
<a name="line-1521"></a><a name="stripSuffix"></a><span class='hs-comment'>-- | /O(n)/ Return the prefix of the second string if its suffix</span>
<a name="line-1522"></a><span class='hs-comment'>-- matches the entire first string.</span>
<a name="line-1523"></a><span class='hs-comment'>--</span>
<a name="line-1524"></a><span class='hs-comment'>-- Examples:</span>
<a name="line-1525"></a><span class='hs-comment'>--</span>
<a name="line-1526"></a><span class='hs-comment'>-- > stripSuffix "bar" "foobar" == Just "foo"</span>
<a name="line-1527"></a><span class='hs-comment'>-- > stripSuffix "" "baz" == Just "baz"</span>
<a name="line-1528"></a><span class='hs-comment'>-- > stripSuffix "foo" "quux" == Nothing</span>
<a name="line-1529"></a><span class='hs-comment'>--</span>
<a name="line-1530"></a><span class='hs-comment'>-- This is particularly useful with the @ViewPatterns@ extension to</span>
<a name="line-1531"></a><span class='hs-comment'>-- GHC, as follows:</span>
<a name="line-1532"></a><span class='hs-comment'>--</span>
<a name="line-1533"></a><span class='hs-comment'>-- > {-# LANGUAGE ViewPatterns #-}</span>
<a name="line-1534"></a><span class='hs-comment'>-- > import Data.Text as T</span>
<a name="line-1535"></a><span class='hs-comment'>-- ></span>
<a name="line-1536"></a><span class='hs-comment'>-- > quuxLength :: Text -> Int</span>
<a name="line-1537"></a><span class='hs-comment'>-- > quuxLength (stripSuffix "quux" -> Just pre) = T.length pre</span>
<a name="line-1538"></a><span class='hs-comment'>-- > quuxLength _ = -1</span>
<a name="line-1539"></a><span class='hs-definition'>stripSuffix</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Text</span>
<a name="line-1540"></a><span class='hs-definition'>stripSuffix</span> <span class='hs-varid'>p</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-sel'>_arr</span> <span class='hs-sel'>_off</span> <span class='hs-varid'>plen</span><span class='hs-layout'>)</span> <span class='hs-varid'>t</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span>
<a name="line-1541"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>p</span> <span class='hs-varop'>`isSuffixOf`</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$!</span> <span class='hs-varid'>textP</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span><span class='hs-comment'>-</span><span class='hs-varid'>plen</span><span class='hs-layout'>)</span>
<a name="line-1542"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-1543"></a>
<a name="line-1544"></a><a name="sumP"></a><span class='hs-comment'>-- | Add a list of non-negative numbers. Errors out on overflow.</span>
<a name="line-1545"></a><span class='hs-definition'>sumP</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Int</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-1546"></a><span class='hs-definition'>sumP</span> <span class='hs-varid'>fun</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span> <span class='hs-num'>0</span>
<a name="line-1547"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>go</span> <span class='hs-varop'>!</span><span class='hs-varid'>a</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span>
<a name="line-1548"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>ax</span> <span class='hs-varop'>>=</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span> <span class='hs-varid'>ax</span> <span class='hs-varid'>xs</span>
<a name="line-1549"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>overflowError</span> <span class='hs-varid'>fun</span>
<a name="line-1550"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>ax</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span> <span class='hs-varop'>+</span> <span class='hs-varid'>x</span>
<a name="line-1551"></a> <span class='hs-varid'>go</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span>
<a name="line-1552"></a>
<a name="line-1553"></a><a name="emptyError"></a><span class='hs-definition'>emptyError</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-1554"></a><span class='hs-definition'>emptyError</span> <span class='hs-varid'>fun</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span><span class='hs-varop'>.</span><span class='hs-varid'>error</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Data.Text."</span> <span class='hs-varop'>++</span> <span class='hs-varid'>fun</span> <span class='hs-varop'>++</span> <span class='hs-str'>": empty input"</span>
<a name="line-1555"></a>
<a name="line-1556"></a><a name="overflowError"></a><span class='hs-definition'>overflowError</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-1557"></a><span class='hs-definition'>overflowError</span> <span class='hs-varid'>fun</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span><span class='hs-varop'>.</span><span class='hs-varid'>error</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Data.Text."</span> <span class='hs-varop'>++</span> <span class='hs-varid'>fun</span> <span class='hs-varop'>++</span> <span class='hs-str'>": size overflow"</span>
</pre></body>
</html>
|