/usr/share/ada/adainclude/gnatcoll/gnatcoll-json-utility.adb is in libgnatcoll1.6-dev 1.6gpl2014-6.
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-- G N A T C O L L --
-- --
-- Copyright (C) 2011-2014, 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/>. --
-- --
------------------------------------------------------------------------------
with Ada.Integer_Text_IO;
with Ada.Strings.Fixed;
with Ada.Strings.Wide_Unbounded; use Ada.Strings.Wide_Unbounded;
pragma Warnings (Off, "*internal GNAT unit*");
with Ada.Strings.Unbounded.Aux;
with System.Unsigned_Types; use System.Unsigned_Types;
pragma Warnings (On, "*internal GNAT unit*");
with GNAT.Encode_UTF8_String;
with GNAT.Decode_UTF8_String;
package body GNATCOLL.JSON.Utility is
use Ada.Strings.Unbounded;
--------------------------------
-- Escape_Non_Print_Character --
--------------------------------
function Escape_Non_Print_Character (C : Wide_Character) return String is
Int : constant Integer := Wide_Character'Pos (C);
Str : String (1 .. 8);
First, Last : Natural;
begin
Ada.Integer_Text_IO.Put (Str, Int, 16);
First := Ada.Strings.Fixed.Index (Str, "16#") + 3;
Last := Ada.Strings.Fixed.Index (Str, "#", Ada.Strings.Backward) - 1;
-- Make sure we have 4 characters, prefixed with '0's
Str (Last - 3 .. First - 1) := (others => '0');
First := Last - 3;
return "\u" & Str (First .. Last);
end Escape_Non_Print_Character;
-------------------
-- Escape_String --
-------------------
function Escape_String
(Text : UTF8_Unbounded_String) return Unbounded_String
is
use Ada.Strings.Unbounded.Aux;
Str : Big_String_Access;
Text_Length : Natural;
Ret : Unbounded_String;
WS : Unbounded_Wide_String;
Low : Natural;
W_Chr : Wide_Character;
begin
Get_String (Text, Str, Text_Length);
-- First decode the UTF-8 String
Low := 1;
while Low <= Text_Length loop
-- UTF-8 sequence is maximum 4 characters long according to RFC3629
GNAT.Decode_UTF8_String.Decode_Wide_Character
(Str (Low .. Natural'Min (Text_Length, Low + 3)), Low, W_Chr);
Append (WS, W_Chr);
end loop;
Append (Ret, '"');
for J in 1 .. Length (WS) loop
W_Chr := Element (WS, J);
case W_Chr is
when '"' =>
Append (Ret, "\""");
when '\' =>
Append (Ret, "\\");
when Wide_Character'Val (Character'Pos (ASCII.BS)) =>
Append (Ret, "\b");
when Wide_Character'Val (Character'Pos (ASCII.FF)) =>
Append (Ret, "\f");
when Wide_Character'Val (Character'Pos (ASCII.LF)) =>
Append (Ret, "\n");
when Wide_Character'Val (Character'Pos (ASCII.CR)) =>
Append (Ret, "\r");
when Wide_Character'Val (Character'Pos (ASCII.HT)) =>
Append (Ret, "\t");
when others =>
if Wide_Character'Pos (W_Chr) >= 16#80# then
Append (Ret, Escape_Non_Print_Character (W_Chr));
else
Append
(Ret, "" & Character'Val (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_Unbounded_String
is
First : Integer;
Last : Integer;
Unb : Unbounded_String;
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
I : constant Short_Unsigned :=
Short_Unsigned'Value
("16#" & Slice (Text, Idx + 1, Idx + 4) & "#");
begin
Append
(Unb,
GNAT.Encode_UTF8_String.Encode_Wide_String
((1 => Wide_Character'Val (I))));
Idx := Idx + 4;
end;
when '"' =>
Append (Unb, '"');
when '/' =>
Append (Unb, '/');
when '\' =>
Append (Unb, '\');
when 'b' =>
Append (Unb, ASCII.BS);
when 'f' =>
Append (Unb, ASCII.FF);
when 'n' =>
Append (Unb, ASCII.LF);
when 'r' =>
Append (Unb, ASCII.CR);
when 't' =>
Append (Unb, ASCII.HT);
when others =>
raise Invalid_JSON_Stream with
"Unexpected escape sequence '\" &
Element (Text, Idx) & "'";
end case;
else
Append
(Unb, Element (Text, Idx));
end if;
Idx := Idx + 1;
end loop;
return Unb;
end Un_Escape_String;
end GNATCOLL.JSON.Utility;
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