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/*
* Copyright (C) 2008 Jürg Billeter <j@bitron.ch>
* Copyright (C) 2008 Dominik Röttsches <dominik.roettsches@access-company.com>
* Copyright (C) 2010 Igalia S.L.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, 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
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#include "config.h"
#include "UnicodeGLib.h"
#include <wtf/Vector.h>
#include <wtf/unicode/UTF8.h>
#define UTF8_IS_SURROGATE(character) (character >= 0x10000 && character <= 0x10FFFF)
namespace WTF {
namespace Unicode {
UChar32 foldCase(UChar32 ch)
{
GOwnPtr<GError> gerror;
GOwnPtr<char> utf8char;
utf8char.set(g_ucs4_to_utf8(reinterpret_cast<gunichar*>(&ch), 1, 0, 0, &gerror.outPtr()));
if (gerror)
return ch;
GOwnPtr<char> utf8caseFolded;
utf8caseFolded.set(g_utf8_casefold(utf8char.get(), -1));
GOwnPtr<gunichar> ucs4Result;
ucs4Result.set(g_utf8_to_ucs4_fast(utf8caseFolded.get(), -1, 0));
return *ucs4Result;
}
static int getUTF16LengthFromUTF8(const gchar* utf8String, int length)
{
int utf16Length = 0;
const gchar* inputString = utf8String;
while ((utf8String + length - inputString > 0) && *inputString) {
gunichar character = g_utf8_get_char(inputString);
utf16Length += UTF8_IS_SURROGATE(character) ? 2 : 1;
inputString = g_utf8_next_char(inputString);
}
return utf16Length;
}
typedef gchar* (*UTF8CaseFunction)(const gchar*, gssize length);
static int convertCase(UChar* result, int resultLength, const UChar* src, int srcLength, bool* error, UTF8CaseFunction caseFunction)
{
*error = false;
// Allocate a buffer big enough to hold all the characters.
Vector<char> buffer(srcLength * 3);
char* utf8Target = buffer.data();
const UChar* utf16Source = src;
ConversionResult conversionResult = convertUTF16ToUTF8(&utf16Source, utf16Source + srcLength, &utf8Target, utf8Target + buffer.size(), true);
if (conversionResult != conversionOK) {
*error = true;
return -1;
}
buffer.shrink(utf8Target - buffer.data());
GOwnPtr<char> utf8Result(caseFunction(buffer.data(), buffer.size()));
long utf8ResultLength = strlen(utf8Result.get());
// Calculate the destination buffer size.
int realLength = getUTF16LengthFromUTF8(utf8Result.get(), utf8ResultLength);
if (realLength > resultLength) {
*error = true;
return realLength;
}
// Convert the result to UTF-16.
UChar* utf16Target = result;
const char* utf8Source = utf8Result.get();
bool unusedISAllASCII;
conversionResult = convertUTF8ToUTF16(&utf8Source, utf8Source + utf8ResultLength, &utf16Target, utf16Target + resultLength, &unusedIsAllASCII, true);
long utf16ResultLength = utf16Target - result;
if (conversionResult != conversionOK)
*error = true;
return utf16ResultLength <= 0 ? -1 : utf16ResultLength;
}
int foldCase(UChar* result, int resultLength, const UChar* src, int srcLength, bool* error)
{
return convertCase(result, resultLength, src, srcLength, error, g_utf8_casefold);
}
int toLower(UChar* result, int resultLength, const UChar* src, int srcLength, bool* error)
{
return convertCase(result, resultLength, src, srcLength, error, g_utf8_strdown);
}
int toUpper(UChar* result, int resultLength, const UChar* src, int srcLength, bool* error)
{
return convertCase(result, resultLength, src, srcLength, error, g_utf8_strup);
}
Direction direction(UChar32 c)
{
PangoBidiType type = pango_bidi_type_for_unichar(c);
switch (type) {
case PANGO_BIDI_TYPE_L:
return LeftToRight;
case PANGO_BIDI_TYPE_R:
return RightToLeft;
case PANGO_BIDI_TYPE_AL:
return RightToLeftArabic;
case PANGO_BIDI_TYPE_LRE:
return LeftToRightEmbedding;
case PANGO_BIDI_TYPE_RLE:
return RightToLeftEmbedding;
case PANGO_BIDI_TYPE_LRO:
return LeftToRightOverride;
case PANGO_BIDI_TYPE_RLO:
return RightToLeftOverride;
case PANGO_BIDI_TYPE_PDF:
return PopDirectionalFormat;
case PANGO_BIDI_TYPE_EN:
return EuropeanNumber;
case PANGO_BIDI_TYPE_AN:
return ArabicNumber;
case PANGO_BIDI_TYPE_ES:
return EuropeanNumberSeparator;
case PANGO_BIDI_TYPE_ET:
return EuropeanNumberTerminator;
case PANGO_BIDI_TYPE_CS:
return CommonNumberSeparator;
case PANGO_BIDI_TYPE_NSM:
return NonSpacingMark;
case PANGO_BIDI_TYPE_BN:
return BoundaryNeutral;
case PANGO_BIDI_TYPE_B:
return BlockSeparator;
case PANGO_BIDI_TYPE_S:
return SegmentSeparator;
case PANGO_BIDI_TYPE_WS:
return WhiteSpaceNeutral;
default:
return OtherNeutral;
}
}
int umemcasecmp(const UChar* a, const UChar* b, int len)
{
GOwnPtr<char> utf8a;
GOwnPtr<char> utf8b;
utf8a.set(g_utf16_to_utf8(a, len, 0, 0, 0));
utf8b.set(g_utf16_to_utf8(b, len, 0, 0, 0));
GOwnPtr<char> foldedA;
GOwnPtr<char> foldedB;
foldedA.set(g_utf8_casefold(utf8a.get(), -1));
foldedB.set(g_utf8_casefold(utf8b.get(), -1));
// FIXME: umemcasecmp needs to mimic u_memcasecmp of icu
// from the ICU docs:
// "Compare two strings case-insensitively using full case folding.
// his is equivalent to u_strcmp(u_strFoldCase(s1, n, options), u_strFoldCase(s2, n, options))."
//
// So it looks like we don't need the full g_utf8_collate here,
// but really a bitwise comparison of casefolded unicode chars (not utf-8 bytes).
// As there is no direct equivalent to this icu function in GLib, for now
// we'll use g_utf8_collate():
return g_utf8_collate(foldedA.get(), foldedB.get());
}
}
}
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