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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.
*
* $URL$
* $Id$
*}
unit UUnicodeUtils;
interface
{$IFDEF FPC}
{$MODE Delphi}
{$ENDIF}
{$I switches.inc}
uses
SysUtils,
Windows;
(*
* Character classes
*)
function IsAlphaChar(ch: WideChar): boolean;
function IsNumericChar(ch: WideChar): boolean;
function IsAlphaNumericChar(ch: WideChar): boolean;
function IsPunctuationChar(ch: WideChar): boolean;
function IsControlChar(ch: WideChar): boolean;
{*
* String format conversion
*}
function UTF8ToUCS4String(const str: UTF8String): UCS4String;
function UCS4ToUTF8String(const str: UCS4String): UTF8String; overload;
function UCS4ToUTF8String(ch: UCS4Char): UTF8String; overload;
{**
* Returns the number of characters (not bytes) in string str.
*}
function LengthUTF8(const str: UTF8String): integer;
{**
* Converts a UCS-4 char ch to its upper-case representation.
*}
function UCS4UpperCase(ch: UCS4Char): UCS4Char; overload;
{**
* Converts a UCS-4 string str to its upper-case representation.
*}
function UCS4UpperCase(const str: UCS4String): UCS4String; overload;
{**
*
*}
function UCS4CharToString(ch: UCS4Char): UCS4String;
(*
* Converts a WideString to its upper-case representation.
* Wrapper for WideUpperCase. Needed because some plattforms have problems with
* unicode support.
*
* Note that characters in UTF-16 might consist of one or two WideChar valus
* (see surrogates). So instead of using WideStringUpperCase(ch)[1] for single
* character access, convert to UCS-4 where each character is represented by
* one UCS4Char.
*)
function WideStringUpperCase(const str: WideString) : WideString;
implementation
function IsAlphaChar(ch: WideChar): boolean;
begin
{$IFDEF MSWINDOWS}
Result := IsCharAlphaW(ch);
{$ELSE}
// TODO: add chars > 255
case ch of
'A'..'Z', // A-Z
'a'..'z', // a-z
#170,#181,#186,
#192..#214,
#216..#246,
#248..#255:
Result := true;
else
Result := false;
end;
{$ENDIF}
end;
function IsNumericChar(ch: WideChar): boolean;
begin
// ignore non-arabic numerals as we do not want to handle them
case ch of
'0'..'9':
Result := true;
else
Result := false;
end;
end;
function IsAlphaNumericChar(ch: WideChar): boolean;
begin
Result := (IsAlphaChar(ch) or IsNumericChar(ch));
end;
function IsPunctuationChar(ch: WideChar): boolean;
begin
// TODO: add chars > 255?
case ch of
' '..'/',':'..'@','['..'`','{'..'~',
#160..#191,#215,#247:
Result := true;
else
Result := false;
end;
end;
function IsControlChar(ch: WideChar): boolean;
begin
case ch of
#0..#31,
#127..#159:
Result := true;
else
Result := false;
end;
end;
function UTF8ToUCS4String(const str: UTF8String): UCS4String;
begin
Result := WideStringToUCS4String(UTF8Decode(str));
end;
function UCS4ToUTF8String(const str: UCS4String): UTF8String;
begin
Result := UTF8Encode(UCS4StringToWideString(str));
end;
function UCS4ToUTF8String(ch: UCS4Char): UTF8String;
begin
Result := UCS4ToUTF8String(UCS4CharToString(ch));
end;
function LengthUTF8(const str: UTF8String): integer;
begin
Result := Length(UTF8ToUCS4String(str));
end;
function UCS4UpperCase(ch: UCS4Char): UCS4Char;
begin
Result := UCS4UpperCase(UCS4CharToString(ch))[0];
end;
function UCS4UpperCase(const str: UCS4String): UCS4String;
begin
// convert to upper-case as WideString and convert result back to UCS-4
Result := WideStringToUCS4String(
WideStringUpperCase(
UCS4StringToWideString(str)));
end;
function UCS4CharToString(ch: UCS4Char): UCS4String;
begin
SetLength(Result, 2);
Result[0] := ch;
Result[1] := 0;
end;
function WideStringUpperCase(const str: WideString): WideString;
begin
// On Linux and MacOSX the cwstring unit is necessary for Unicode function-calls.
// Otherwise you will get an EIntOverflow exception (thrown by unimplementedwidestring()).
// The Unicode manager cwstring does not work with MacOSX at the moment because
// of missing references to iconv. So we have to use Ansi... for the moment.
{.$IFNDEF DARWIN}
{$IFDEF NOIGNORE}
Result := WideUpperCase(str)
{$ELSE}
Result := UTF8Decode(AnsiUpperCase(UTF8Encode(str)));
{$ENDIF}
end;
end.
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