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222 | --
-- Copyright (C) 2014-2022, AdaCore
-- SPDX-License-Identifier: Apache-2.0
--
with Ada.Strings.Unbounded; use Ada.Strings.Unbounded;
with Ada.Wide_Wide_Characters.Handling;
with Interfaces; use Interfaces;
with System;
with GNATCOLL.Iconv;
package body Gpr_Parser_Support.Text is
------------------
-- Text_Charset --
------------------
function Text_Charset return String is
use GNATCOLL.Iconv, System;
begin
if Default_Bit_Order = Low_Order_First then
return UTF32LE;
else
return UTF32BE;
end if;
end Text_Charset;
-------------
-- To_Text --
-------------
function To_Text (S : String) return Text_Type is
Result : Text_Type (1 .. S'Length);
begin
for I in Result'Range loop
declare
C : constant Character := S (S'First + I - 1);
begin
if C in ASCII.NUL .. Character'Val (16#7f#) then
Result (I) := Wide_Wide_Character'Val (Character'Pos (C));
else
raise Constraint_Error with "Invalid ASCII character";
end if;
end;
end loop;
return Result;
end To_Text;
-----------
-- Image --
-----------
function Image (T : Text_Type; With_Quotes : Boolean := False) return String
is
subtype Hex_Byte is String (1 .. 2);
-- Couple of hexadecimal digits, used to represent a byte
function Byte_Image (B : Unsigned_8) return Hex_Byte;
-- Given a byte, return the corresponding two-chars hexadecimal image
----------------
-- Byte_Image --
----------------
function Byte_Image (B : Unsigned_8) return Hex_Byte
is
type Digits_Type is array (Unsigned_8 range 0 .. 15) of Character;
D : constant Digits_Type := "0123456789abcdef";
begin
return D (B / 16) & D (B mod 16);
end Byte_Image;
Result : Unbounded_String;
W : Unsigned_32;
begin
if With_Quotes then
Append (Result, '"');
end if;
for C of T loop
-- Determine how to output each character:
--
-- - Escape backslashes and escape quotes if With_Quotes.
-- - Output other ASCII chars as-is.
-- - Escape non-ASCII small chars with \xXX sequences.
-- - Escape other medium chars with \uXXXX sequences.
-- - Escape the rest with \UXXXXXXXX sequences.
W := Wide_Wide_Character'Pos (C);
if (With_Quotes and then C = '"') or else C = '\' then
Append (Result, '\');
Append (Result, Character'Val (W));
elsif 16#20# <= W and then W <= 16#7f# then
Append (Result, Character'Val (W));
elsif W <= 16#ff# then
Append (Result, "\x" & Byte_Image (Unsigned_8 (W)));
elsif W <= 16#ffff# then
Append
(Result,
"\u"
& Byte_Image (Unsigned_8 (W / 16#100#))
& Byte_Image (Unsigned_8 (W mod 16#100#)));
else
Append
(Result,
"\U"
& Byte_Image (Unsigned_8 (W / 16#100_0000#))
& Byte_Image (Unsigned_8 (W / 16#1_0000# mod 16#100#))
& Byte_Image (Unsigned_8 (W / 16#100# mod 16#100#))
& Byte_Image (Unsigned_8 (W mod 16#100#)));
end if;
end loop;
if With_Quotes then
Append (Result, '"');
end if;
return To_String (Result);
end Image;
-----------------------
-- Process_As_String --
-----------------------
procedure Process_As_String
(Text : Text_Type;
Proc : access procedure (S : String))
is
S : String (1 .. 4 * Text'Length)
with Import => True,
Address => Text'Address;
begin
Proc.all (S);
end Process_As_String;
------------
-- Encode --
------------
function Encode (Text : Text_Type; Charset : String) return String is
S : String (1 .. 4 * Text'Length) with Import, Address => Text'Address;
begin
return GNATCOLL.Iconv.Iconv
(Input => S,
To_Code => Charset,
From_Code => Text_Charset);
end Encode;
------------
-- Decode --
------------
function Decode (S : String; Charset : String) return Text_Type is
Result : constant String := GNATCOLL.Iconv.Iconv
(Input => S,
To_Code => Text_Charset,
From_Code => Charset);
pragma Assert (Result'Length mod 4 = 0);
Text_Result : constant Text_Type (1 .. Result'Length / 4)
with Import, Address => Result'Address;
begin
return Text_Result;
end Decode;
-------------
-- To_UTF8 --
-------------
function To_UTF8
(Text : Text_Type) return Ada.Strings.UTF_Encoding.UTF_8_String is
begin
return Encode (Text, "UTF-8");
end To_UTF8;
---------------
-- From_UTF8 --
---------------
function From_UTF8
(S : Ada.Strings.UTF_Encoding.UTF_8_String) return Text_Type is
begin
return Decode (S, "UTF-8");
end From_UTF8;
--------------
-- To_Lower --
--------------
function To_Lower (C : Character_Type) return Character_Type is
subtype WWC is Wide_Wide_Character;
First_ASCII : constant WWC :=
WWC'Val (Character'Pos (ASCII.NUL));
Last_ASCII : constant WWC :=
WWC'Val (Character'Pos (ASCII.DEL));
subtype WWC_ASCII is WWC range First_ASCII .. Last_ASCII;
begin
if C in 'A' .. 'Z' then
return WWC'Val (WWC'Pos (C) - WWC'Pos ('A') + WWC'Pos ('a'));
elsif C in WWC_ASCII'Range then
return C;
else
return Ada.Wide_Wide_Characters.Handling.To_Lower (C);
end if;
end To_Lower;
--------------
-- To_Lower --
--------------
function To_Lower (Text : Text_Type) return Text_Type is
begin
return Result : Text_Type := Text do
for C of Result loop
C := To_Lower (C);
end loop;
end return;
end To_Lower;
end Gpr_Parser_Support.Text;
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