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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include <i18nutil/casefolding.hxx>
#include "casefolding_data.h"
#include <i18nutil/oneToOneMapping.hxx>
#include <i18nutil/widthfolding.hxx>
#include <i18nutil/transliteration.hxx>
#include <com/sun/star/lang/Locale.hpp>
#include <com/sun/star/uno/RuntimeException.hpp>
#include <rtl/character.hxx>
#include <unicode/uchar.h>
using namespace com::sun::star::lang;
using namespace com::sun::star::uno;
namespace i18nutil {
const Mapping mapping_03a3[] = {{0, 1, {0x03c2, 0, 0}},{0, 1, {0x03c3, 0, 0}}};
const Mapping mapping_0307[] = {{0, 0, {0, 0, 0}},{0, 1, {0x0307, 0, 0}}};
const Mapping mapping_004a[] = {{0, 2, {0x006a, 0x0307, 0}},{0, 1, {0x006a, 0, 0}}};
const Mapping mapping_012e[] = {{0, 2, {0x012f, 0x0307, 0}},{0, 1, {0x012f, 0, 0}}};
const Mapping mapping_00cc[] = {{0, 3, {0x0069, 0x0307, 0x0300}},{0, 1, {0x00ec, 0, 0}}};
const Mapping mapping_00cd[] = {{0, 3, {0x0069, 0x0307, 0x0301}},{0, 1, {0x00ed, 0, 0}}};
const Mapping mapping_0128[] = {{0, 3, {0x0069, 0x0307, 0x0303}},{0, 1, {0x0129, 0, 0}}};
const Mapping mapping_0049[] = {{0, 2, {0x0069, 0x0307, 0}},{0, 1, {0x0131, 0, 0}},{0, 1, {0x0069, 0, 0}}};
const Mapping mapping_0069[] = {{0, 1, {0x0130, 0, 0}},{0, 1, {0x0049, 0, 0}}};
const Mapping mapping_0130[] = {{0, 1, {0x0069, 0, 0}},{0, 1, {0x0130, 0, 0}}};
#define langIs(lang) (aLocale.Language == lang)
// only check simple case, there is more complicated case need to be checked.
#define type_i(ch) ((ch) == 0x0069 || (ch) == 0x006a)
static bool cased_letter(sal_Unicode ch)
{
int msb = ch >> 8;
int cmi = CaseMappingIndex[msb];
if (cmi < 0)
return false;
int cmv_idx = (cmi << 8) + (ch & 0xff);
return bool(static_cast<MappingType>(CaseMappingValue[cmv_idx].type) & MappingType::CasedLetterMask);
}
// for Lithuanian, condition to make explicit dot above when lowercasing capital I's and J's
// whenever there are more accents above.
#define accent_above(ch) (((ch) >= 0x0300 && (ch) <= 0x0314) || ((ch) >= 0x033D && (ch) <= 0x0344) || (ch) == 0x0346 || ((ch) >= 0x034A && (ch) <= 0x034C))
const Mapping& casefolding::getConditionalValue(const sal_Unicode* str, sal_Int32 pos, sal_Int32 len, Locale const & aLocale, MappingType nMappingType)
{
switch(str[pos]) {
case 0x03a3:
// final_sigma (not followed by cased and preceded by cased character)
// DOES NOT check ignorable sequence yet (more complicated implementation).
return !(pos < len && cased_letter(str[pos+1])) && (pos > 0 && cased_letter(str[pos-1])) ?
mapping_03a3[0] : mapping_03a3[1];
case 0x0307:
return (((nMappingType == MappingType::LowerToUpper && langIs("lt")) ||
(nMappingType == MappingType::UpperToLower && (langIs("tr") || langIs("az")))) &&
(pos > 0 && type_i(str[pos-1]))) ? // after_i
mapping_0307[0] : mapping_0307[1];
case 0x0130:
return (langIs("tr") || langIs("az")) ? mapping_0130[0] : mapping_0130[1];
case 0x0069:
return (langIs("tr") || langIs("az")) ? mapping_0069[0] : mapping_0069[1];
case 0x0049: return langIs("lt") && pos > len && accent_above(str[pos+1]) ? mapping_0049[0] :
(langIs("tr") || langIs("az")) ? mapping_0049[1] : mapping_0049[2];
case 0x004a: return langIs("lt") && pos > len && accent_above(str[pos+1]) ? mapping_004a[0] : mapping_004a[1];
case 0x012e: return langIs("lt") && pos > len && accent_above(str[pos+1]) ? mapping_012e[0] : mapping_012e[1];
case 0x00cc: return langIs("lt") ? mapping_00cc[0] : mapping_00cc[1];
case 0x00cd: return langIs("lt") ? mapping_00cd[0] : mapping_00cd[1];
case 0x0128: return langIs("lt") ? mapping_0128[0] : mapping_0128[1];
}
// Should not come here
throw RuntimeException();
}
Mapping casefolding::getValue(const sal_Unicode* str, sal_Int32 pos, sal_Int32 len, Locale const & aLocale, MappingType nMappingType)
{
if (pos > 0 && rtl::isHighSurrogate(str[pos-1]) && rtl::isLowSurrogate(str[pos]))
return { 0, 0, { 0, 0, 0 } };
Mapping dummy = { 0, 1, { str[pos], 0, 0 } };
sal_uInt32 c;
if (pos + 1 < len && rtl::isHighSurrogate(str[pos]) && rtl::isLowSurrogate(str[pos + 1]))
c = rtl::combineSurrogates(str[pos], str[pos + 1]);
else
c = str[pos];
sal_Int16 address = -1;
if (c < SAL_N_ELEMENTS(CaseMappingIndex) * 256)
address = CaseMappingIndex[c >> 8];
if (address >= 0) {
address = (address << 8) + (c & 0xFF);
if (static_cast<MappingType>(CaseMappingValue[address].type) & nMappingType) {
MappingType type = static_cast<MappingType>(CaseMappingValue[address].type);
if (type & MappingType::NotValue) {
if (CaseMappingValue[address].value == 0)
return getConditionalValue(str, pos, len, aLocale, nMappingType);
else {
for (int map = CaseMappingValue[address].value;
map < CaseMappingValue[address].value + MaxCaseMappingExtras; map++) {
if (static_cast<MappingType>(CaseMappingExtra[map].type) & nMappingType) {
if (static_cast<MappingType>(CaseMappingExtra[map].type) & MappingType::NotValue)
return getConditionalValue(str, pos, len, aLocale, nMappingType);
else
return CaseMappingExtra[map];
}
}
// Should not come here
throw RuntimeException();
}
}
else
{
dummy.map[0] = CaseMappingValue[address].value;
return dummy;
}
}
}
// If the code point is not supported by our case mapping tables,
// fallback to ICU functions.
// TODO: this does not handle special case mapping as these require
// using ustring.h APIs, which work on the whole string not character
// by character.
// TODO: what is the difference between ToLower and UpperToLower etc.?
sal_uInt32 value = c;
switch (nMappingType)
{
case MappingType::ToLower:
case MappingType::UpperToLower:
value = u_tolower(c);
break;
case MappingType::ToUpper:
case MappingType::LowerToUpper:
value = u_toupper(c);
break;
case MappingType::ToTitle:
value = u_totitle(c);
break;
case MappingType::SimpleFolding:
case MappingType::FullFolding:
value = u_foldCase(c, U_FOLD_CASE_DEFAULT);
break;
default: break;
}
dummy.nmap = rtl::splitSurrogates(value, dummy.map);
return dummy;
}
static bool
is_ja_voice_sound_mark(sal_Unicode& current, sal_Unicode next)
{
if (next != 0x3099 && next != 0x309a)
return false;
sal_Unicode c = widthfolding::getCompositionChar(current, next);
if (c != 0)
current = c;
return c != 0;
}
sal_Unicode casefolding::getNextChar(const sal_Unicode *str, sal_Int32& idx, sal_Int32 len, MappingElement& e, Locale const & aLocale, MappingType nMappingType, TransliterationFlags moduleLoaded)
{
if( idx >= len )
{
e = MappingElement();
return 0;
}
sal_Unicode c;
if (moduleLoaded & TransliterationFlags::IGNORE_CASE) {
if( e.current >= e.element.nmap ) {
e.element = getValue(str, idx++, len, aLocale, nMappingType);
e.current = 0;
}
c = e.element.map[e.current++];
} else {
c = *(str + idx++);
}
if (moduleLoaded & TransliterationFlags::IGNORE_KANA) {
if ((0x3040 <= c && c <= 0x3094) || (0x309d <= c && c <= 0x309f))
c += 0x60;
}
// composition: KA + voice-mark --> GA. see halfwidthToFullwidth.cxx for detail
if (moduleLoaded & TransliterationFlags::IGNORE_WIDTH) {
static oneToOneMapping& half2fullTable = widthfolding::gethalf2fullTable();
c = half2fullTable[c];
if (0x3040 <= c && c <= 0x30ff && idx < len &&
is_ja_voice_sound_mark(c, half2fullTable[*(str + idx)]))
idx++;
}
return c;
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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