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{* UltraStar Deluxe - Karaoke Game
*
* UltraStar Deluxe is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*}
// Auto
// try to match the w3c regex and decode as unicode on match and as fallback if not match
// (copied from http://www.w3.org/International/questions/qa-forms-utf-8.en.php)
//
// m/\A(
// [\x09\x0A\x0D\x20-\x7E] # ASCII
// | [\xC2-\xDF][\x80-\xBF] # non-overlong 2-byte
// | \xE0[\xA0-\xBF][\x80-\xBF] # excluding overlongs
// | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2} # straight 3-byte
// | \xED[\x80-\x9F][\x80-\xBF] # excluding surrogates
// | \xF0[\x90-\xBF][\x80-\xBF]{2} # planes 1-3
// | [\xF1-\xF3][\x80-\xBF]{3} # planes 4-15
// | \xF4[\x80-\x8F][\x80-\xBF]{2} # plane 16
// )*\z/x
type
TEncoderAuto = class(TEncoder)
public
function GetName(): AnsiString; override;
function Encode(const InStr: UCS4String; out OutStr: AnsiString): boolean; override;
function Decode(const InStr: AnsiString; out OutStr: UCS4String): boolean; override;
constructor Create(const UTF8Encoder, FallbackEncoder: IEncoder);
private
FallbackEncoder: IEncoder;
UTF8Encoder: IEncoder;
Regex: PPCRE;
RegexExtra: PPCREExtra;
end;
function PCREGetMem(Size: SizeInt): Pointer; cdecl;
begin
GetMem(Result, Size);
end;
procedure PCREFreeMem(P: Pointer); cdecl;
begin
FreeMem(P);
end;
// NOTICE: Log.LogError/ConsoleWriteLn/DebugWriteLn are initialized yet
procedure ShowError(const msg: string);
begin
{$IFDEF CONSOLE}
WriteLn('ERROR: ', msg);
{$ENDIF}
end;
constructor TEncoderAuto.Create(const UTF8Encoder, FallbackEncoder: IEncoder);
var
Error: PChar;
ErrorOffset: Integer;
begin
inherited Create();
self.FallbackEncoder := FallbackEncoder;
self.UTF8Encoder := UTF8Encoder;
// Load and initialize PCRE Library
if LoadPCRE() then
begin
// compile regex
self.Regex := pcre_compile('\A([\x09\x0A\x0D\x20-\x7E]|[\xC2-\xDF][\x80-\xBF]|\xE0[\xA0-\xBF][\x80-\xBF]|[\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}|\xED[\x80-\x9F][\x80-\xBF]|\xF0[\x90-\xBF][\x80-\xBF]{2}|[\xF1-\xF3][\x80-\xBF]{3}|\xF4[\x80-\x8F][\x80-\xBF]{2})*\z', 0, @Error, @ErrorOffset, nil);
if self.Regex = Nil then
begin
ShowError(Format('UTF8 Regex compilation failed: %s at %d', [Error, ErrorOffset]));
end
else
begin
// if compiled successfull, try to get more informations the speed up the matching
self.RegexExtra := pcre_study(self.Regex, 0, @Error);
if Error <> Nil then
begin
ShowError('UTF8 Regex study failed: ' + Error);
end;
end;
end
else
begin
ShowError('pcre not loaded. utf-8 autodetection will not work.');
end;
end;
function TEncoderAuto.GetName(): AnsiString;
begin
Result := 'Auto';
end;
function TEncoderAuto.Decode(const InStr: AnsiString; out OutStr: UCS4String): boolean;
var
RegexResults: Integer;
begin
if (self.Regex <> Nil) then
begin
RegexResults := pcre_exec(Regex, RegexExtra, PChar(InStr), Length(InStr), 0, 0, Nil, 0);
if RegexResults >= 0 then
begin
Result := UTF8Encoder.Decode(InStr, OutStr);
Exit;
end;
end;
Result := FallbackEncoder.Decode(InStr, OutStr);
end;
function TEncoderAuto.Encode(const InStr: UCS4String; out OutStr: AnsiString): boolean;
begin
Result := UTF8Encoder.Encode(InStr, OutStr);
end;
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