i18npool/source/breakiterator/breakiterator_th.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 <breakiterator_th.hxx>
  21 #include <wtt.h>
  22
  23 #include <string.h> // for memset
  24
  25 using namespace ::com::sun::star::uno;
  26 using namespace ::com::sun::star::lang;
  27 using namespace ::rtl;
  28
  29 namespace com { namespace sun { namespace star { namespace i18n {
  30
  31 //  ----------------------------------------------------
  32 //  class Breakiterator_th
  33 //  ----------------------------------------------------;
  34 BreakIterator_th::BreakIterator_th()
  35 {
  36     cBreakIterator = "com.sun.star.i18n.BreakIterator_th";
  37     wordRule=lineRule=NULL;
  38 }
  39
  40 BreakIterator_th::~BreakIterator_th()
  41 {
  42 }
  43
  44 #define SARA_AM 0x0E33
  45
  46 /*
  47  * cell composition states
  48  */
  49
  50 #define ST_COM  1   // Compose the following character with leading char and display in the same cell
  51 #define ST_NXT  2   // display the following character in the next cell
  52 #define ST_NDP  3   // non-display
  53
  54 static const sal_Int16 thaiCompRel[MAX_CT][MAX_CT] = {
  55     //  C  N  C  L  F  F  F  B  B  B  T  A  A  A  A  A  A
  56     //  T  O  O  V  V  V  V  V  V  D  O  D  D  D  V  V  V
  57     //  R  N  N     1  2  3  1  2     N  1  2  3  1  2  3
  58     //  L     S                       E
  59     //  0  1  2  3  4  5  6  7  8  9  10 11 12 13 14 15 16
  60     {   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // CTRL 0
  61     {   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // NON  1
  62     {   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_COM, ST_COM, ST_COM, ST_COM, ST_COM, ST_COM, ST_COM, ST_COM, ST_COM, ST_COM   }, // CONS 2
  63     {   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // LV   3
  64     {   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // FV1  4
  65     {   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // FV2  5
  66     {   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // FV3  6
  67     {   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_COM, ST_COM, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // BV1  7
  68     {   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_COM, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // BV2  8
  69     {   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // BD   9
  70     {   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // TONE 10
  71     {   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // AD1  11
  72     {   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // AD2  12
  73     {   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // AD3  13
  74     {   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_COM, ST_COM, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // AV1  14
  75     {   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_COM, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT   }, // AV2  15
  76     {   ST_NDP, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_NXT, ST_COM, ST_NXT, ST_COM, ST_NXT, ST_NXT, ST_NXT, ST_NXT   } // AV3  16
  77
  78 };
  79
  80 const sal_uInt32 is_ST_COM = (1<<CT_CTRL)|(1<<CT_NON)|(1<<CT_CONS)|(1<<CT_TONE);
  81
  82 static sal_uInt16 SAL_CALL getCombState(const sal_Unicode *text, sal_Int32 pos)
  83 {
  84     sal_uInt16 ch1 = getCharType(text[pos]);
  85     sal_uInt16 ch2 = getCharType(text[pos+1]);
  86
  87     if (text[pos+1] == SARA_AM) {
  88         if ((1 << ch1) & is_ST_COM)
  89         return  ST_COM;
  90         else
  91         ch2 = CT_AD1;
  92     }
  93
  94     return thaiCompRel[ch1][ch2];
  95 }
  96
  97
  98 static sal_Int32 SAL_CALL getACell(const sal_Unicode *text, sal_Int32 pos, sal_Int32 len)
  99 {
 100     sal_uInt32 curr = 1;
 101     for (; pos + 1 < len && getCombState(text, pos) == ST_COM; curr++, pos++) {}
 102     return curr;
 103 }
 104
 105 #define is_Thai(c)  (0x0e00 <= c && c <= 0x0e7f) // Unicode definition for Thai
 106
 107 void SAL_CALL BreakIterator_th::makeIndex(const OUString& Text, sal_Int32 nStartPos)
 108     throw(RuntimeException)
 109 {
 110     if (Text != cachedText) {
 111         cachedText = Text;
 112         if (cellIndexSize < cachedText.getLength()) {
 113         cellIndexSize = cachedText.getLength();
 114         free(nextCellIndex);
 115         free(previousCellIndex);
 116         nextCellIndex = (sal_Int32*) calloc(cellIndexSize, sizeof(sal_Int32));
 117         previousCellIndex = (sal_Int32*) calloc(cellIndexSize, sizeof(sal_Int32));
 118         }
 119         // reset nextCell for new Text
 120         memset(nextCellIndex, 0, cellIndexSize * sizeof(sal_Int32));
 121     }
 122     else if (nextCellIndex[nStartPos] > 0 || ! is_Thai(Text[nStartPos]))
 123         return;
 124
 125     const sal_Unicode* str = cachedText.getStr();
 126     sal_Int32 len = cachedText.getLength(), startPos, endPos;
 127
 128     startPos = nStartPos;
 129     while (startPos > 0 && is_Thai(str[startPos-1])) startPos--;
 130     endPos = nStartPos+1;
 131     while (endPos < len && is_Thai(str[endPos])) endPos++;
 132
 133     sal_Int32 start, end, pos;
 134     pos = start = end = startPos;
 135
 136     while (pos < endPos) {
 137         end += getACell(str, start, endPos);
 138         while (pos < end) {
 139         nextCellIndex[pos] = end;
 140         previousCellIndex[pos] = start;
 141         pos++;
 142         }
 143         start = end;
 144     }
 145 }
 146
 147 } } } }
 148
 149 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */