/usr/share/doc/libghc-lens-doc/html/src/Data-Sequence-Lens.html is in libghc-lens-doc 4.13-1.
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 | <?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>src/Data/Sequence/Lens.hs</title>
<link type='text/css' rel='stylesheet' href='hscolour.css' />
</head>
<body>
<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE Rank2Types #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE FlexibleContexts #-}</span>
<a name="line-3"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-4"></a><span class='hs-comment'>-- |</span>
<a name="line-5"></a><span class='hs-comment'>-- Module : Data.Sequence.Lens</span>
<a name="line-6"></a><span class='hs-comment'>-- Copyright : (C) 2012-15 Edward Kmett</span>
<a name="line-7"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-8"></a><span class='hs-comment'>-- Maintainer : Edward Kmett <ekmett@gmail.com></span>
<a name="line-9"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-10"></a><span class='hs-comment'>-- Portability : non-portable</span>
<a name="line-11"></a><span class='hs-comment'>--</span>
<a name="line-12"></a><span class='hs-comment'>----------------------------------------------------------------------------</span>
<a name="line-13"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Sequence</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span>
<a name="line-14"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>viewL</span><span class='hs-layout'>,</span> <span class='hs-varid'>viewR</span>
<a name="line-15"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>sliced</span><span class='hs-layout'>,</span> <span class='hs-varid'>slicedTo</span><span class='hs-layout'>,</span> <span class='hs-varid'>slicedFrom</span>
<a name="line-16"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>seqOf</span>
<a name="line-17"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-18"></a>
<a name="line-19"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Applicative</span>
<a name="line-20"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span>
<a name="line-21"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Monoid</span>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Sequence</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Seq</span>
<a name="line-23"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Prelude</span>
<a name="line-24"></a>
<a name="line-25"></a><span class='hs-comment'>-- $setup</span>
<a name="line-26"></a><span class='hs-comment'>-- >>> import Debug.SimpleReflect.Expr</span>
<a name="line-27"></a><span class='hs-comment'>-- >>> import Debug.SimpleReflect.Vars as Vars hiding (f,g)</span>
<a name="line-28"></a><span class='hs-comment'>-- >>> let f :: Expr -> Expr; f = Debug.SimpleReflect.Vars.f</span>
<a name="line-29"></a><span class='hs-comment'>-- >>> let g :: Expr -> Expr; g = Debug.SimpleReflect.Vars.g</span>
<a name="line-30"></a>
<a name="line-31"></a><span class='hs-comment'>-- * Sequence isomorphisms</span>
<a name="line-32"></a>
<a name="line-33"></a><a name="viewL"></a><span class='hs-comment'>-- | A 'Seq' is isomorphic to a 'ViewL'</span>
<a name="line-34"></a><span class='hs-comment'>--</span>
<a name="line-35"></a><span class='hs-comment'>-- @'viewl' m ≡ m '^.' 'viewL'@</span>
<a name="line-36"></a><span class='hs-comment'>--</span>
<a name="line-37"></a><span class='hs-comment'>-- >>> Seq.fromList [a,b,c] ^. viewL</span>
<a name="line-38"></a><span class='hs-comment'>-- a :< fromList [b,c]</span>
<a name="line-39"></a><span class='hs-comment'>--</span>
<a name="line-40"></a><span class='hs-comment'>-- >>> Seq.empty ^. viewL</span>
<a name="line-41"></a><span class='hs-comment'>-- EmptyL</span>
<a name="line-42"></a><span class='hs-comment'>--</span>
<a name="line-43"></a><span class='hs-comment'>-- >>> EmptyL ^. from viewL</span>
<a name="line-44"></a><span class='hs-comment'>-- fromList []</span>
<a name="line-45"></a><span class='hs-comment'>--</span>
<a name="line-46"></a><span class='hs-comment'>-- >>> review viewL $ a Seq.:< fromList [b,c]</span>
<a name="line-47"></a><span class='hs-comment'>-- fromList [a,b,c]</span>
<a name="line-48"></a><span class='hs-definition'>viewL</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Iso</span> <span class='hs-layout'>(</span><span class='hs-conid'>Seq</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Seq</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>ViewL</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>ViewL</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-49"></a><span class='hs-definition'>viewL</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iso</span> <span class='hs-varid'>viewl</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>xs</span> <span class='hs-keyword'>of</span>
<a name="line-50"></a> <span class='hs-conid'>EmptyL</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>mempty</span>
<a name="line-51"></a> <span class='hs-varid'>a</span> <span class='hs-conid'>Seq</span><span class='hs-varop'>.:<</span> <span class='hs-keyword'>as</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-conid'>Seq</span><span class='hs-varop'>.<|</span> <span class='hs-keyword'>as</span>
<a name="line-52"></a><span class='hs-comment'>{-# INLINE viewL #-}</span>
<a name="line-53"></a>
<a name="line-54"></a><a name="viewR"></a><span class='hs-comment'>-- | A 'Seq' is isomorphic to a 'ViewR'</span>
<a name="line-55"></a><span class='hs-comment'>--</span>
<a name="line-56"></a><span class='hs-comment'>-- @'viewr' m ≡ m '^.' 'viewR'@</span>
<a name="line-57"></a><span class='hs-comment'>--</span>
<a name="line-58"></a><span class='hs-comment'>-- >>> Seq.fromList [a,b,c] ^. viewR</span>
<a name="line-59"></a><span class='hs-comment'>-- fromList [a,b] :> c</span>
<a name="line-60"></a><span class='hs-comment'>--</span>
<a name="line-61"></a><span class='hs-comment'>-- >>> Seq.empty ^. viewR</span>
<a name="line-62"></a><span class='hs-comment'>-- EmptyR</span>
<a name="line-63"></a><span class='hs-comment'>--</span>
<a name="line-64"></a><span class='hs-comment'>-- >>> EmptyR ^. from viewR</span>
<a name="line-65"></a><span class='hs-comment'>-- fromList []</span>
<a name="line-66"></a><span class='hs-comment'>--</span>
<a name="line-67"></a><span class='hs-comment'>-- >>> review viewR $ fromList [a,b] Seq.:> c</span>
<a name="line-68"></a><span class='hs-comment'>-- fromList [a,b,c]</span>
<a name="line-69"></a><span class='hs-definition'>viewR</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Iso</span> <span class='hs-layout'>(</span><span class='hs-conid'>Seq</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Seq</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>ViewR</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>ViewR</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-70"></a><span class='hs-definition'>viewR</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iso</span> <span class='hs-varid'>viewr</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>xs</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>xs</span> <span class='hs-keyword'>of</span>
<a name="line-71"></a> <span class='hs-conid'>EmptyR</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>mempty</span>
<a name="line-72"></a> <span class='hs-keyword'>as</span> <span class='hs-conid'>Seq</span><span class='hs-varop'>.:></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Seq</span><span class='hs-varop'>.|></span> <span class='hs-varid'>a</span>
<a name="line-73"></a><span class='hs-comment'>{-# INLINE viewR #-}</span>
<a name="line-74"></a>
<a name="line-75"></a><a name="slicedTo"></a><span class='hs-comment'>-- | Traverse the first @n@ elements of a 'Seq'</span>
<a name="line-76"></a><span class='hs-comment'>--</span>
<a name="line-77"></a><span class='hs-comment'>-- >>> fromList [a,b,c,d,e] ^.. slicedTo 2</span>
<a name="line-78"></a><span class='hs-comment'>-- [a,b]</span>
<a name="line-79"></a><span class='hs-comment'>--</span>
<a name="line-80"></a><span class='hs-comment'>-- >>> fromList [a,b,c,d,e] & slicedTo 2 %~ f</span>
<a name="line-81"></a><span class='hs-comment'>-- fromList [f a,f b,c,d,e]</span>
<a name="line-82"></a><span class='hs-comment'>--</span>
<a name="line-83"></a><span class='hs-comment'>-- >>> fromList [a,b,c,d,e] & slicedTo 10 .~ x</span>
<a name="line-84"></a><span class='hs-comment'>-- fromList [x,x,x,x,x]</span>
<a name="line-85"></a><span class='hs-definition'>slicedTo</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IndexedTraversal'</span> <span class='hs-conid'>Int</span> <span class='hs-layout'>(</span><span class='hs-conid'>Seq</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span>
<a name="line-86"></a><span class='hs-definition'>slicedTo</span> <span class='hs-varid'>n</span> <span class='hs-varid'>f</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-conid'>Seq</span><span class='hs-varop'>.</span><span class='hs-varid'>splitAt</span> <span class='hs-varid'>n</span> <span class='hs-varid'>m</span> <span class='hs-keyword'>of</span>
<a name="line-87"></a> <span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-layout'>,</span><span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varop'>><</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varop'><$></span> <span class='hs-varid'>itraverse</span> <span class='hs-layout'>(</span><span class='hs-varid'>indexed</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varid'>l</span>
<a name="line-88"></a><span class='hs-comment'>{-# INLINE slicedTo #-}</span>
<a name="line-89"></a>
<a name="line-90"></a><a name="slicedFrom"></a><span class='hs-comment'>-- | Traverse all but the first @n@ elements of a 'Seq'</span>
<a name="line-91"></a><span class='hs-comment'>--</span>
<a name="line-92"></a><span class='hs-comment'>-- >>> fromList [a,b,c,d,e] ^.. slicedFrom 2</span>
<a name="line-93"></a><span class='hs-comment'>-- [c,d,e]</span>
<a name="line-94"></a><span class='hs-comment'>--</span>
<a name="line-95"></a><span class='hs-comment'>-- >>> fromList [a,b,c,d,e] & slicedFrom 2 %~ f</span>
<a name="line-96"></a><span class='hs-comment'>-- fromList [a,b,f c,f d,f e]</span>
<a name="line-97"></a><span class='hs-comment'>--</span>
<a name="line-98"></a><span class='hs-comment'>-- >>> fromList [a,b,c,d,e] & slicedFrom 10 .~ x</span>
<a name="line-99"></a><span class='hs-comment'>-- fromList [a,b,c,d,e]</span>
<a name="line-100"></a><span class='hs-definition'>slicedFrom</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IndexedTraversal'</span> <span class='hs-conid'>Int</span> <span class='hs-layout'>(</span><span class='hs-conid'>Seq</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span>
<a name="line-101"></a><span class='hs-definition'>slicedFrom</span> <span class='hs-varid'>n</span> <span class='hs-varid'>f</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-conid'>Seq</span><span class='hs-varop'>.</span><span class='hs-varid'>splitAt</span> <span class='hs-varid'>n</span> <span class='hs-varid'>m</span> <span class='hs-keyword'>of</span>
<a name="line-102"></a> <span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-layout'>,</span><span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span> <span class='hs-varop'>><</span><span class='hs-layout'>)</span> <span class='hs-varop'><$></span> <span class='hs-varid'>itraverse</span> <span class='hs-layout'>(</span><span class='hs-varid'>indexed</span> <span class='hs-varid'>f</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</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'>r</span>
<a name="line-103"></a><span class='hs-comment'>{-# INLINE slicedFrom #-}</span>
<a name="line-104"></a>
<a name="line-105"></a><span class='hs-comment'>-- | Traverse all the elements numbered from @i@ to @j@ of a 'Seq'</span>
<a name="line-106"></a><span class='hs-comment'>--</span>
<a name="line-107"></a><span class='hs-comment'>-- >>> fromList [a,b,c,d,e] & sliced 1 3 %~ f</span>
<a name="line-108"></a><span class='hs-comment'>-- fromList [a,f b,f c,d,e]</span>
<a name="line-109"></a>
<a name="line-110"></a><a name="sliced"></a><span class='hs-comment'>-- >>> fromList [a,b,c,d,e] ^.. sliced 1 3</span>
<a name="line-111"></a><span class='hs-comment'>-- [f b,f c]</span>
<a name="line-112"></a><span class='hs-comment'>--</span>
<a name="line-113"></a><span class='hs-comment'>-- >>> fromList [a,b,c,d,e] & sliced 1 3 .~ x</span>
<a name="line-114"></a><span class='hs-comment'>-- fromList [a,x,x,b,e]</span>
<a name="line-115"></a><span class='hs-definition'>sliced</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IndexedTraversal'</span> <span class='hs-conid'>Int</span> <span class='hs-layout'>(</span><span class='hs-conid'>Seq</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span>
<a name="line-116"></a><span class='hs-definition'>sliced</span> <span class='hs-varid'>i</span> <span class='hs-varid'>j</span> <span class='hs-varid'>f</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-conid'>Seq</span><span class='hs-varop'>.</span><span class='hs-varid'>splitAt</span> <span class='hs-varid'>i</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-117"></a> <span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-layout'>,</span><span class='hs-varid'>mr</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-conid'>Seq</span><span class='hs-varop'>.</span><span class='hs-varid'>splitAt</span> <span class='hs-layout'>(</span><span class='hs-varid'>j</span><span class='hs-comment'>-</span><span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-varid'>mr</span> <span class='hs-keyword'>of</span>
<a name="line-118"></a> <span class='hs-layout'>(</span><span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>itraverse</span> <span class='hs-layout'>(</span><span class='hs-varid'>indexed</span> <span class='hs-varid'>f</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</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'>m</span> <span class='hs-varop'><&></span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>n</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>l</span> <span class='hs-varop'>><</span> <span class='hs-varid'>n</span> <span class='hs-varop'>><</span> <span class='hs-varid'>r</span>
<a name="line-119"></a><span class='hs-comment'>{-# INLINE sliced #-}</span>
<a name="line-120"></a>
<a name="line-121"></a><a name="seqOf"></a><span class='hs-comment'>-- | Construct a 'Seq' from a 'Getter', 'Control.Lens.Fold.Fold', 'Control.Lens.Traversal.Traversal', 'Control.Lens.Lens.Lens' or 'Control.Lens.Iso.Iso'.</span>
<a name="line-122"></a><span class='hs-comment'>--</span>
<a name="line-123"></a><span class='hs-comment'>-- >>> seqOf folded ["hello","world"]</span>
<a name="line-124"></a><span class='hs-comment'>-- fromList ["hello","world"]</span>
<a name="line-125"></a><span class='hs-comment'>--</span>
<a name="line-126"></a><span class='hs-comment'>-- >>> seqOf (folded._2) [("hello",1),("world",2),("!!!",3)]</span>
<a name="line-127"></a><span class='hs-comment'>-- fromList [1,2,3]</span>
<a name="line-128"></a><span class='hs-comment'>--</span>
<a name="line-129"></a><span class='hs-comment'>-- @</span>
<a name="line-130"></a><span class='hs-comment'>-- 'seqOf' :: 'Getter' s a -> s -> 'Seq' a</span>
<a name="line-131"></a><span class='hs-comment'>-- 'seqOf' :: 'Fold' s a -> s -> 'Seq' a</span>
<a name="line-132"></a><span class='hs-comment'>-- 'seqOf' :: 'Iso'' s a -> s -> 'Seq' a</span>
<a name="line-133"></a><span class='hs-comment'>-- 'seqOf' :: 'Lens'' s a -> s -> 'Seq' a</span>
<a name="line-134"></a><span class='hs-comment'>-- 'seqOf' :: 'Traversal'' s a -> s -> 'Seq' a</span>
<a name="line-135"></a><span class='hs-comment'>-- @</span>
<a name="line-136"></a><span class='hs-definition'>seqOf</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Getting</span> <span class='hs-layout'>(</span><span class='hs-conid'>Seq</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Seq</span> <span class='hs-varid'>a</span>
<a name="line-137"></a><span class='hs-definition'>seqOf</span> <span class='hs-varid'>l</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>views</span> <span class='hs-varid'>l</span> <span class='hs-conid'>Seq</span><span class='hs-varop'>.</span><span class='hs-varid'>singleton</span>
<a name="line-138"></a><span class='hs-comment'>{-# INLINE seqOf #-}</span>
</pre></body>
</html>
|