/usr/share/ada/adainclude/gnatcoll/gnatcoll-json-utility.adb is in libgnatcoll16.1.0-dev 17.0.2017-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- G N A T C O L L --
-- --
-- Copyright (C) 2011-2017, AdaCore --
-- --
-- This library is free software; you can redistribute it and/or modify it --
-- under terms of the GNU General Public License as published by the Free --
-- Software Foundation; either version 3, or (at your option) any later --
-- version. This library is distributed in the hope that it will be useful, --
-- but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHAN- --
-- TABILITY or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- --
-- --
-- --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
------------------------------------------------------------------------------
pragma Ada_2012;
with Ada.Characters.Wide_Wide_Latin_1; use Ada.Characters.Wide_Wide_Latin_1;
with Interfaces; use Interfaces;
with GNAT.Encode_UTF8_String;
with GNAT.Decode_UTF8_String;
package body GNATCOLL.JSON.Utility is
use Ada.Strings.Unbounded;
To_Hex : constant array (Unsigned_16 range 0 .. 15) of Character :=
"0123456789ABCDEF";
--------------------------------
-- Escape_Non_Print_Character --
--------------------------------
function Escape_Non_Print_Character
(C : Wide_Wide_Character) return String
is
Code : constant Unsigned_32 := Wide_Wide_Character'Pos (C);
Buf : String (1 .. 12);
Last : Natural := Buf'First - 1;
procedure Append_Escaped (Code : Unsigned_16);
--------------------
-- Append_Escaped --
--------------------
procedure Append_Escaped (Code : Unsigned_16) is
begin
Last := Last + 6;
Buf (Last - 5 .. Last - 4) := "\u";
Buf (Last - 3) := To_Hex ((Code / 16#1000#) mod 16#10#);
Buf (Last - 2) := To_Hex ((Code / 16#100#) mod 16#10#);
Buf (Last - 1) := To_Hex ((Code / 16#10#) mod 16#10#);
Buf (Last) := To_Hex (Code mod 16#10#);
end Append_Escaped;
begin
if Code <= 16#FFFF# then
Append_Escaped (Unsigned_16 (Code));
else
-- Represent character as surrogate pair
Append_Escaped
(16#D800# + Unsigned_16 ((Code - 16#1_0000#) / 16#400#));
Append_Escaped (16#DC00# + Unsigned_16 (Code mod 16#400#));
end if;
return Buf (Buf'First .. Last);
end Escape_Non_Print_Character;
-------------------
-- Escape_String --
-------------------
function Escape_String (Text : UTF8_XString) return Unbounded_String is
Str : GNATCOLL.Strings.Char_Array;
Text_Length : Natural;
Ret : Unbounded_String;
Low : Natural;
W_Chr : Wide_Wide_Character;
begin
Text.Get_String (Str, Text_Length);
Append (Ret, '"');
Low := 1;
while Low <= Text_Length loop
-- UTF-8 sequence is maximum 4 characters long according to RFC3629
begin
GNAT.Decode_UTF8_String.Decode_Wide_Wide_Character
(String (Str (Low .. Natural'Min (Text_Length, Low + 3))),
Low, W_Chr);
exception
when Constraint_Error =>
-- Skip the character even if it is invalid.
Low := Low + 1;
W_Chr := NUL;
end;
case W_Chr is
when NUL =>
null;
when '"' =>
Append (Ret, "\""");
when '\' =>
Append (Ret, "\\");
when BS =>
Append (Ret, "\b");
when FF =>
Append (Ret, "\f");
when LF =>
Append (Ret, "\n");
when CR =>
Append (Ret, "\r");
when HT =>
Append (Ret, "\t");
when others =>
if Wide_Wide_Character'Pos (W_Chr) < 32 then
Append (Ret, Escape_Non_Print_Character (W_Chr));
elsif Wide_Wide_Character'Pos (W_Chr) >= 16#80# then
Append (Ret, Escape_Non_Print_Character (W_Chr));
else
Append
(Ret,
"" & Character'Val (Wide_Wide_Character'Pos (W_Chr)));
end if;
end case;
end loop;
Append (Ret, '"');
return Ret;
end Escape_String;
----------------------
-- Un_Escape_String --
----------------------
function Un_Escape_String
(Text : Unbounded_String;
Low : Natural;
High : Natural) return UTF8_XString
is
First : Integer;
Last : Integer;
Unb : UTF8_XString;
Idx : Natural;
begin
First := Low;
Last := High;
-- Trim blanks and double quotes
while First <= High and then Element (Text, First) = ' ' loop
First := First + 1;
end loop;
if First <= High and then Element (Text, First) = '"' then
First := First + 1;
end if;
while Last >= Low and then Element (Text, Last) = ' ' loop
Last := Last - 1;
end loop;
if Last >= Low and then Element (Text, Last) = '"' then
Last := Last - 1;
end if;
Idx := First;
while Idx <= Last loop
if Element (Text, Idx) = '\' then
Idx := Idx + 1;
if Idx > High then
raise Invalid_JSON_Stream with
"Unexpected escape character at end of line";
end if;
-- See http://tools.ietf.org/html/rfc4627 for the list of
-- characters that can be escaped.
case Element (Text, Idx) is
when 'u' | 'U' =>
declare
Lead : constant Unsigned_16 :=
Unsigned_16'Value
("16#" & Slice (Text, Idx + 1, Idx + 4) & "#");
Trail : Unsigned_16;
Char : Wide_Wide_Character;
begin
Char := Wide_Wide_Character'Val (Lead);
-- If character is high surrogate and next character is
-- low surrogate then them represent one non-BMP
-- character.
if Lead in 16#D800# .. 16#DBFF#
and then Element (Text, Idx + 5) = '\'
and then Element (Text, Idx + 6) in 'u' | 'U'
then
Trail := Unsigned_16'Value
("16#" & Slice (Text, Idx + 7, Idx + 10) & '#');
Char := Wide_Wide_Character'Val
(16#1_0000#
+ Unsigned_32 (Lead and 16#03FF#) * 16#0400#
+ Unsigned_32 (Trail and 16#03FF#));
Idx := Idx + 6;
end if;
Unb.Append
(GNAT.Encode_UTF8_String.Encode_Wide_Wide_String
((1 => Char)));
Idx := Idx + 4;
end;
when '"' =>
Unb.Append ('"');
when '/' =>
Unb.Append ('/');
when '\' =>
Unb.Append ('\');
when 'b' =>
Unb.Append (ASCII.BS);
when 'f' =>
Unb.Append (ASCII.FF);
when 'n' =>
Unb.Append (ASCII.LF);
when 'r' =>
Unb.Append (ASCII.CR);
when 't' =>
Unb.Append (ASCII.HT);
when others =>
raise Invalid_JSON_Stream with
"Unexpected escape sequence '\" &
Element (Text, Idx) & "'";
end case;
else
Unb.Append (Element (Text, Idx));
end if;
Idx := Idx + 1;
end loop;
return Unb;
end Un_Escape_String;
end GNATCOLL.JSON.Utility;
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