i18nutil/source/utility/casefolding.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <i18nutil/casefolding.hxx>
  21 #include "casefolding_data.h"
  22 #include <i18nutil/oneToOneMapping.hxx>
  23 #include <i18nutil/widthfolding.hxx>
  24 #include <i18nutil/transliteration.hxx>
  25 #include <com/sun/star/lang/Locale.hpp>
  26 #include <com/sun/star/uno/RuntimeException.hpp>
  27
  28 using namespace com::sun::star::lang;
  29 using namespace com::sun::star::uno;
  30
  31 namespace i18nutil {
  32
  33 static const Mapping mapping_03a3[] = {{0, 1, {0x03c2, 0, 0}},{0, 1, {0x03c3, 0, 0}}};
  34 static const Mapping mapping_0307[] = {{0, 0, {0, 0, 0}},{0, 1, {0x0307, 0, 0}}};
  35 static const Mapping mapping_004a[] = {{0, 2, {0x006a, 0x0307, 0}},{0, 1, {0x006a, 0, 0}}};
  36 static const Mapping mapping_012e[] = {{0, 2, {0x012f, 0x0307, 0}},{0, 1, {0x012f, 0, 0}}};
  37 static const Mapping mapping_00cc[] = {{0, 3, {0x0069, 0x0307, 0x0300}},{0, 1, {0x00ec, 0, 0}}};
  38 static const Mapping mapping_00cd[] = {{0, 3, {0x0069, 0x0307, 0x0301}},{0, 1, {0x00ed, 0, 0}}};
  39 static const Mapping mapping_0128[] = {{0, 3, {0x0069, 0x0307, 0x0303}},{0, 1, {0x0129, 0, 0}}};
  40 static const Mapping mapping_0049[] = {{0, 2, {0x0069, 0x0307, 0}},{0, 1, {0x0131, 0, 0}},{0, 1, {0x0069, 0, 0}}};
  41 static const Mapping mapping_0069[] = {{0, 1, {0x0130, 0, 0}},{0, 1, {0x0049, 0, 0}}};
  42 static const Mapping mapping_0130[] = {{0, 1, {0x0069, 0, 0}},{0, 1, {0x0130, 0, 0}}};
  43
  44 #define langIs(lang) (aLocale.Language == lang)
  45
  46 // only check simple case, there is more complicated case need to be checked.
  47 #define type_i(ch) ((ch) == 0x0069 || (ch) == 0x006a)
  48
  49 static bool cased_letter(sal_Unicode ch)
  50 {
  51     int msb = ch >> 8;
  52     int cmi = CaseMappingIndex[msb];
  53     if (cmi < 0)
  54         return false;
  55     int cmv_idx = (cmi << 8) + (ch & 0xff);
  56     return bool(static_cast<MappingType>(CaseMappingValue[cmv_idx].type) & MappingType::CasedLetterMask);
  57 }
  58
  59 // for Lithuanian, condition to make explicit dot above when lowercasing capital I's and J's
  60 // whenever there are more accents above.
  61 #define accent_above(ch) (((ch) >= 0x0300 && (ch) <= 0x0314) || ((ch) >= 0x033D && (ch) <= 0x0344) || (ch) == 0x0346 || ((ch) >= 0x034A && (ch) <= 0x034C))
  62
  63 const Mapping& casefolding::getConditionalValue(const sal_Unicode* str, sal_Int32 pos, sal_Int32 len, Locale const & aLocale, MappingType nMappingType)
  64 {
  65         switch(str[pos]) {
  66         case 0x03a3:
  67             // final_sigma (not followed by cased and preceded by cased character)
  68             // DOES NOT check ignorable sequence yet (more complicated implementation).
  69             return !(pos < len && cased_letter(str[pos+1])) && (pos > 0 && cased_letter(str[pos-1])) ?
  70                 mapping_03a3[0] : mapping_03a3[1];
  71         case 0x0307:
  72             return (((nMappingType == MappingType::LowerToUpper && langIs("lt")) ||
  73                 (nMappingType == MappingType::UpperToLower && (langIs("tr") || langIs("az")))) &&
  74                 (pos > 0 && type_i(str[pos-1]))) ?      // after_i
  75                     mapping_0307[0] : mapping_0307[1];
  76         case 0x0130:
  77             return (langIs("tr") || langIs("az")) ? mapping_0130[0] : mapping_0130[1];
  78         case 0x0069:
  79             return (langIs("tr") || langIs("az")) ? mapping_0069[0] : mapping_0069[1];
  80         case 0x0049: return langIs("lt") && pos > len && accent_above(str[pos+1]) ? mapping_0049[0] :
  81                     (langIs("tr") || langIs("az")) ? mapping_0049[1] : mapping_0049[2];
  82         case 0x004a: return langIs("lt") && pos > len && accent_above(str[pos+1]) ? mapping_004a[0] : mapping_004a[1];
  83         case 0x012e: return langIs("lt") && pos > len && accent_above(str[pos+1]) ? mapping_012e[0] : mapping_012e[1];
  84         case 0x00cc: return langIs("lt") ? mapping_00cc[0] : mapping_00cc[1];
  85         case 0x00cd: return langIs("lt") ? mapping_00cd[0] : mapping_00cd[1];
  86         case 0x0128: return langIs("lt") ? mapping_0128[0] : mapping_0128[1];
  87         }
  88         // Should not come here
  89         throw RuntimeException();
  90 }
  91
  92 Mapping casefolding::getValue(const sal_Unicode* str, sal_Int32 pos, sal_Int32 len, Locale const & aLocale, MappingType nMappingType)
  93 {
  94     Mapping dummy = { 0, 1, { 0, 0, 0 } };
  95     sal_Int16 address = CaseMappingIndex[str[pos] >> 8];
  96
  97     dummy.map[0] = str[pos];
  98
  99     if (address >= 0) {
 100         address = (address << 8) + (str[pos] & 0xFF);
 101         if (static_cast<MappingType>(CaseMappingValue[address].type) & nMappingType) {
 102             MappingType type = static_cast<MappingType>(CaseMappingValue[address].type);
 103             if (type & MappingType::NotValue) {
 104                 if (CaseMappingValue[address].value == 0)
 105                     return getConditionalValue(str, pos, len, aLocale, nMappingType);
 106                 else {
 107                     for (int map = CaseMappingValue[address].value;
 108                             map < CaseMappingValue[address].value + MaxCaseMappingExtras; map++) {
 109                         if (static_cast<MappingType>(CaseMappingExtra[map].type) & nMappingType) {
 110                             if (static_cast<MappingType>(CaseMappingExtra[map].type) & MappingType::NotValue)
 111                                 return getConditionalValue(str, pos, len, aLocale, nMappingType);
 112                             else
 113                                 return CaseMappingExtra[map];
 114                         }
 115                     }
 116                     // Should not come here
 117                     throw RuntimeException();
 118                 }
 119             } else
 120                 dummy.map[0] = CaseMappingValue[address].value;
 121         }
 122     }
 123     return dummy;
 124 }
 125
 126 static bool
 127 is_ja_voice_sound_mark(sal_Unicode& current, sal_Unicode next)
 128 {
 129         sal_Unicode c = 0;
 130
 131         if ((next == 0x3099 || next == 0x309a) && ( (c = widthfolding::getCompositionChar(current, next)) != 0 ))
 132             current = c;
 133         return c != 0;
 134 }
 135
 136 sal_Unicode casefolding::getNextChar(const sal_Unicode *str, sal_Int32& idx, sal_Int32 len, MappingElement& e, Locale const & aLocale, MappingType nMappingType, TransliterationFlags moduleLoaded)
 137 {
 138         if( idx >= len )
 139         {
 140             e = MappingElement();
 141             return 0;
 142         }
 143
 144         sal_Unicode c;
 145
 146         if (moduleLoaded & TransliterationFlags::IGNORE_CASE) {
 147             if( e.current >= e.element.nmap ) {
 148                 e.element = getValue(str, idx++, len, aLocale, nMappingType);
 149                 e.current = 0;
 150             }
 151             c = e.element.map[e.current++];
 152         } else {
 153             c = *(str + idx++);
 154         }
 155
 156         if (moduleLoaded & TransliterationFlags::IGNORE_KANA) {
 157             if ((0x3040 <= c && c <= 0x3094) || (0x309d <= c && c <= 0x309f))
 158                 c += 0x60;
 159         }
 160
 161         // composition: KA + voice-mark --> GA. see halfwidthToFullwidth.cxx for detail
 162         if (moduleLoaded & TransliterationFlags::IGNORE_WIDTH) {
 163             static oneToOneMapping& half2fullTable = widthfolding::gethalf2fullTable();
 164             c = half2fullTable[c];
 165             if (0x3040 <= c && c <= 0x30ff && idx < len &&
 166                     is_ja_voice_sound_mark(c, half2fullTable[*(str + idx)]))
 167                 idx++;
 168         }
 169
 170         return c;
 171 }
 172
 173 }
 174
 175 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */