528 lines
17 KiB
C++
528 lines
17 KiB
C++
/*
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* %W% %E%
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*
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* (C) Copyright IBM Corp. 1998, 1999, 2000 - All Rights Reserved
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*
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*/
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#include "LETypes.h"
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#include "OpenTypeTables.h"
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#include "OpenTypeUtilities.h"
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#include "IndicReordering.h"
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#include "ScriptAndLanguageTags.h"
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class ReorderingOutput
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{
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private:
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le_int32 fOutIndex;
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LEUnicode *fOutChars;
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le_int32 *fCharIndices;
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const LETag **fCharTags;
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LEUnicode fMpre;
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LEUnicode fMbelow;
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LEUnicode fMabove;
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LEUnicode fMpost;
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LEUnicode fLengthMark;
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le_int32 fMatraIndex;
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const LETag *fMatraTags;
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void saveMatra(LEUnicode matra, IndicClassTable::CharClass matraClass)
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{
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// FIXME: check if already set, or if not a matra...
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if (IndicClassTable::isMpre(matraClass)) {
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fMpre = matra;
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} else if (IndicClassTable::isMbelow(matraClass)) {
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fMbelow = matra;
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} else if (IndicClassTable::isMabove(matraClass)) {
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fMabove = matra;
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} else if (IndicClassTable::isMpost(matraClass)) {
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fMpost = matra;
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} else if (IndicClassTable::isLengthMark(matraClass)) {
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fLengthMark = matra;
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}
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}
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public:
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ReorderingOutput(LEUnicode *outChars, le_int32 *charIndices, const LETag **charTags)
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: fOutIndex(0), fOutChars(outChars), fCharIndices(charIndices), fCharTags(charTags),
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fMpre(0), fMbelow(0), fMabove(0), fMpost(0), fLengthMark(0),
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fMatraIndex(0), fMatraTags(NULL)
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{
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// nothing else to do...
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}
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~ReorderingOutput()
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{
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// nothing to do here...
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}
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void noteMatra(const IndicClassTable *classTable, LEUnicode matra, le_uint32 matraIndex, const LETag *matraTags)
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{
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IndicClassTable::CharClass matraClass = classTable->getCharClass(matra);
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fMpre = fMbelow = fMabove = fMpost = fLengthMark = 0;
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fMatraIndex = matraIndex;
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fMatraTags = matraTags;
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if (IndicClassTable::isMatra(matraClass)) {
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if (IndicClassTable::isSplitMatra(matraClass)) {
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const SplitMatra *splitMatra = classTable->getSplitMatra(matraClass);
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int i;
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for (i = 0; i < 3 && (*splitMatra)[i] != 0; i += 1) {
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LEUnicode piece = (*splitMatra)[i];
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IndicClassTable::CharClass pieceClass = classTable->getCharClass(piece);
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saveMatra(piece, pieceClass);
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}
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} else {
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saveMatra(matra, matraClass);
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}
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}
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}
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void writeMpre()
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{
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if (fMpre != 0) {
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writeChar(fMpre, fMatraIndex, fMatraTags);
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}
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}
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void writeMbelow()
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{
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if (fMbelow != 0) {
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writeChar(fMbelow, fMatraIndex, fMatraTags);
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}
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}
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void writeMabove()
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{
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if (fMabove != 0) {
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writeChar(fMabove, fMatraIndex, fMatraTags);
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}
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}
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void writeMpost()
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{
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if (fMpost != 0) {
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writeChar(fMpost, fMatraIndex, fMatraTags);
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}
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}
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void writeLengthMark()
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{
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if (fLengthMark != 0) {
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writeChar(fLengthMark, fMatraIndex, fMatraTags);
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}
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}
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void writeChar(LEUnicode ch, le_uint32 charIndex, const LETag *charTags)
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{
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fOutChars[fOutIndex] = ch;
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fCharIndices[fOutIndex] = charIndex;
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fCharTags[fOutIndex] = charTags;
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fOutIndex += 1;
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}
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le_int32 getOutputIndex()
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{
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return fOutIndex;
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}
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};
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enum
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{
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C_DOTTED_CIRCLE = 0x25CC
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};
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const LETag emptyTag = 0x00000000; // ''
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const LETag nuktFeatureTag = 0x6E756B74; // 'nukt'
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const LETag akhnFeatureTag = 0x616B686E; // 'akhn'
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const LETag rphfFeatureTag = 0x72706866; // 'rphf'
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const LETag blwfFeatureTag = 0x626C7766; // 'blwf'
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const LETag halfFeatureTag = 0x68616C66; // 'half'
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const LETag pstfFeatureTag = 0x70737466; // 'pstf'
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const LETag vatuFeatureTag = 0x76617475; // 'vatu'
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const LETag presFeatureTag = 0x70726573; // 'pres'
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const LETag blwsFeatureTag = 0x626C7773; // 'blws'
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const LETag abvsFeatureTag = 0x61627673; // 'abvs'
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const LETag pstsFeatureTag = 0x70737473; // 'psts'
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const LETag halnFeatureTag = 0x68616C6E; // 'haln'
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const LETag blwmFeatureTag = 0x626C776D; // 'blwm'
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const LETag abvmFeatureTag = 0x6162766D; // 'abvm'
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const LETag distFeatureTag = 0x64697374; // 'dist'
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// FIXME: do we want a seperate tag array for each kind of character??
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const LETag tagArray[] =
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{
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rphfFeatureTag, blwfFeatureTag, halfFeatureTag, nuktFeatureTag, akhnFeatureTag, pstfFeatureTag,
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vatuFeatureTag, presFeatureTag, blwsFeatureTag, abvsFeatureTag, pstsFeatureTag, halnFeatureTag,
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blwmFeatureTag, abvmFeatureTag, emptyTag
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};
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const le_int8 stateTable[][IndicClassTable::CC_COUNT] =
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{
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// xx ma mp iv ct cn nu dv vr zw
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{ 1, 1, 1, 5, 3, 2, 1, 1, 1, 1},
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{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{-1, 6, 1, -1, -1, -1, -1, 5, 4, -1},
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{-1, 6, 1, -1, -1, -1, 2, 5, 4, -1},
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{-1, -1, -1, -1, 3, 2, -1, -1, -1, 8},
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{-1, 6, 1, -1, -1, -1, -1, -1, -1, -1},
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{-1, 7, 1, -1, -1, -1, -1, -1, -1, -1},
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{-1, -1, 1, -1, -1, -1, -1, -1, -1, -1},
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{-1, -1, -1, -1, 3, 2, -1, -1, -1, -1}
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};
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le_int32 IndicReordering::findSyllable(const IndicClassTable *classTable, const LEUnicode *chars, le_int32 prev, le_int32 charCount)
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{
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le_int32 cursor = prev;
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le_int8 state = 0;
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while (cursor < charCount) {
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IndicClassTable::CharClass charClass = classTable->getCharClass(chars[cursor]);
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state = stateTable[state][charClass & IndicClassTable::CF_CLASS_MASK];
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if (state < 0) {
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break;
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}
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cursor += 1;
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}
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return cursor;
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}
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le_int32 IndicReordering::reorder(const LEUnicode *chars, le_int32 charCount, le_int32 scriptCode, LEUnicode *outChars, le_int32 *charIndices, const LETag **charTags)
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{
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const IndicClassTable *classTable = IndicClassTable::getScriptClassTable(scriptCode);
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ReorderingOutput output(outChars, charIndices, charTags);
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le_int32 i, prev = 0;
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while (prev < charCount) {
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le_int32 syllable = findSyllable(classTable, chars, prev, charCount);
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le_int32 matra, vmabove, vmpost = syllable;
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le_int16 flags = 0;
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while (vmpost > prev && classTable->isVMpost(chars[vmpost - 1])) {
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vmpost -= 1;
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}
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vmabove = vmpost;
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while (vmabove > prev && classTable->isVMabove(chars[vmabove - 1])) {
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vmabove -= 1;
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}
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matra = vmabove - 1;
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output.noteMatra(classTable, chars[matra], matra, &tagArray[1]);
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switch (classTable->getCharClass(chars[prev]) & IndicClassTable::CF_CLASS_MASK) {
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case IndicClassTable::CC_RESERVED:
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case IndicClassTable::CC_INDEPENDENT_VOWEL:
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case IndicClassTable::CC_ZERO_WIDTH_MARK:
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for (i = prev; i < syllable; i += 1) {
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output.writeChar(chars[i], i, &tagArray[1]);
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}
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break;
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case IndicClassTable::CC_MODIFYING_MARK_ABOVE:
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case IndicClassTable::CC_MODIFYING_MARK_POST:
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case IndicClassTable::CC_NUKTA:
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case IndicClassTable::CC_VIRAMA:
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output.writeChar(C_DOTTED_CIRCLE, prev, &tagArray[1]);
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output.writeChar(chars[prev], prev, &tagArray[1]);
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break;
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case IndicClassTable::CC_DEPENDENT_VOWEL:
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output.writeMpre();
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output.writeChar(C_DOTTED_CIRCLE, prev, &tagArray[1]);
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output.writeMbelow();
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output.writeMabove();
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output.writeMpost();
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output.writeLengthMark();
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break;
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case IndicClassTable::CC_CONSONANT:
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case IndicClassTable::CC_CONSONANT_WITH_NUKTA:
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{
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le_uint32 length = vmabove - prev;
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le_int32 lastConsonant = vmabove - 1;
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le_int32 baseLimit = prev;
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// Check for REPH at front of syllable
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if (length > 2 && classTable->isReph(chars[prev]) && classTable->isVirama(chars[prev + 1])) {
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baseLimit = prev + 2;
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// Check for eyelash RA, if the script supports it
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if ((classTable->scriptFlags & IndicClassTable::SF_EYELASH_RA) != 0 &&
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chars[prev + 2] == C_SIGN_ZWJ) {
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if (length > 3) {
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baseLimit += 1;
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} else {
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baseLimit = prev;
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}
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}
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}
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while (lastConsonant >= baseLimit && !classTable->isConsonant(chars[lastConsonant])) {
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lastConsonant -= 1;
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}
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le_int32 baseConsonant = lastConsonant;
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le_int32 postBase = lastConsonant + 1;
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if (lastConsonant >= prev) {
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int postBaseLimit = classTable->scriptFlags & IndicClassTable::SF_POST_BASE_LIMIT_MASK;
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le_bool seenVattu = false;
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le_bool seenBelowBaseForm = false;
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while (baseConsonant >= baseLimit) {
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IndicClassTable::CharClass charClass = classTable->getCharClass(chars[baseConsonant]);
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if (IndicClassTable::isConsonant(charClass)) {
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if (postBaseLimit == 0 || seenVattu ||
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(baseConsonant > baseLimit && !classTable->isVirama(chars[baseConsonant - 1])) ||
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!IndicClassTable::hasPostOrBelowBaseForm(charClass)) {
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break;
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}
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seenVattu = IndicClassTable::isVattu(charClass);
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if (IndicClassTable::hasPostBaseForm(charClass)) {
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if (seenBelowBaseForm) {
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break;
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}
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postBase = baseConsonant;
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} else if (IndicClassTable::hasBelowBaseForm(charClass)) {
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seenBelowBaseForm = true;
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}
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postBaseLimit -= 1;
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}
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baseConsonant -= 1;
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}
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if (baseConsonant < baseLimit) {
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baseConsonant = baseLimit;
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}
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// Write Mpre
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output.writeMpre();
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// Write eyelash RA
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// NOTE: baseLimit == prev + 3 iff eyelash RA present...
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if (baseLimit == prev + 3) {
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output.writeChar(chars[prev], prev, &tagArray[2]);
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output.writeChar(chars[prev + 1], prev + 1, &tagArray[2]);
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output.writeChar(chars[prev + 2], prev + 2, &tagArray[2]);
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}
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// write any pre-base consonants
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le_bool supressVattu = true;
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for (i = baseLimit; i < baseConsonant; i += 1) {
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LEUnicode ch = chars[i];
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const LETag *tag = &tagArray[1];
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IndicClassTable::CharClass charClass = classTable->getCharClass(ch);
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if (IndicClassTable::isConsonant(charClass)) {
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if (IndicClassTable::isVattu(charClass) && supressVattu) {
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tag = &tagArray[3];
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}
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supressVattu = IndicClassTable::isVattu(charClass);
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} else if (IndicClassTable::isVirama(charClass) && chars[i + 1] == C_SIGN_ZWNJ)
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{
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tag = &tagArray[3];
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}
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output.writeChar(ch, i, tag);
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}
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le_int32 bcSpan = baseConsonant + 1;
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if (bcSpan < vmabove && classTable->isNukta(chars[bcSpan])) {
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bcSpan += 1;
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}
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if (baseConsonant == lastConsonant && bcSpan < vmabove && classTable->isVirama(chars[bcSpan])) {
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bcSpan += 1;
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if (bcSpan < vmabove && chars[bcSpan] == C_SIGN_ZWNJ) {
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bcSpan += 1;
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}
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}
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// write base consonant
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for (i = baseConsonant; i < bcSpan; i += 1) {
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output.writeChar(chars[i], i, &tagArray[3]);
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}
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if ((classTable->scriptFlags & IndicClassTable::SF_MATRAS_AFTER_BASE) != 0) {
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output.writeMbelow();
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output.writeMabove();
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output.writeMpost();
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}
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// write below-base consonants
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if (baseConsonant != lastConsonant) {
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for (i = bcSpan + 1; i < postBase; i += 1) {
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output.writeChar(chars[i], i, &tagArray[1]);
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}
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if (postBase > lastConsonant) {
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// write halant that was after base consonant
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output.writeChar(chars[bcSpan], bcSpan, &tagArray[1]);
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}
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}
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// write Mbelow, Mabove
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if ((classTable->scriptFlags & IndicClassTable::SF_MATRAS_AFTER_BASE) == 0) {
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output.writeMbelow();
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output.writeMabove();
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}
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if ((classTable->scriptFlags & IndicClassTable::SF_REPH_AFTER_BELOW) != 0) {
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if (baseLimit == prev + 2) {
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output.writeChar(chars[prev], prev, &tagArray[0]);
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output.writeChar(chars[prev + 1], prev + 1, &tagArray[0]);
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}
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// write VMabove
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for (i = vmabove; i < vmpost; i += 1) {
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output.writeChar(chars[i], i, &tagArray[1]);
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}
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}
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// write post-base consonants
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// FIXME: does this put the right tags on post-base consonants?
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if (baseConsonant != lastConsonant) {
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if (postBase <= lastConsonant) {
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for (i = postBase; i <= lastConsonant; i += 1) {
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output.writeChar(chars[i], i, &tagArray[3]);
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}
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// write halant that was after base consonant
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output.writeChar(chars[bcSpan], bcSpan, &tagArray[1]);
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}
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// write the training halant, if there is one
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if (lastConsonant < matra && classTable->isVirama(chars[matra])) {
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output.writeChar(chars[matra], matra, &tagArray[3]);
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}
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}
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// write Mpost
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if ((classTable->scriptFlags & IndicClassTable::SF_MATRAS_AFTER_BASE) == 0) {
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output.writeMpost();
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}
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output.writeLengthMark();
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// write reph
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if ((classTable->scriptFlags & IndicClassTable::SF_REPH_AFTER_BELOW) == 0) {
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if (baseLimit == prev + 2) {
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output.writeChar(chars[prev], prev, &tagArray[0]);
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output.writeChar(chars[prev + 1], prev + 1, &tagArray[0]);
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}
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// write VMabove
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for (i = vmabove; i < vmpost; i += 1) {
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output.writeChar(chars[i], i, &tagArray[1]);
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}
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}
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// write VMpost
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for (i = vmpost; i < syllable; i += 1) {
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output.writeChar(chars[i], i, &tagArray[1]);
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}
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}
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break;
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}
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default:
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break;
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}
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prev = syllable;
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}
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return output.getOutputIndex();
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}
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void IndicReordering::adjustMPres(const LEUnicode *chars, le_int32 charCount, LEGlyphID *glyphs, le_int32 *charIndices, le_int32 scriptCode)
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{
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const IndicClassTable *classTable = IndicClassTable::getScriptClassTable(scriptCode);
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if (classTable->scriptFlags & IndicClassTable::SF_MPRE_FIXUP) {
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le_int32 i;
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for (i = 0; i < charCount; i += 1) {
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if (classTable->isMpre(chars[i])) {
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le_int32 j;
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le_bool cflag = true;
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for (j = i + 1; j < charCount; j += 1) {
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IndicClassTable::CharClass charClass = classTable->getCharClass(chars[j]);
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if (IndicClassTable::isConsonant(charClass)) {
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if (! cflag) {
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break;
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}
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cflag = false;
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} else if (IndicClassTable::isVirama(charClass)) {
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if (cflag) {
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break;
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}
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cflag = true;
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} else {
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break;
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}
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}
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// Don't bother to reorder if
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// there's one or fewer consonants
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if (j <= i + 2) {
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continue;
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}
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int lastConsonant = j - 1;
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int base;
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for (base = lastConsonant; base > i; base -= 1) {
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if (classTable->isConsonant(chars[base]) && glyphs[base] != 0xFFFF) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
LEGlyphID matra = glyphs[i];
|
|
le_int32 mIndex = charIndices[i];
|
|
le_int32 x;
|
|
|
|
for (x = i; x < base - 1; x += 1) {
|
|
glyphs[x] = glyphs[x + 1];
|
|
charIndices[x] = charIndices[x + 1];
|
|
}
|
|
|
|
glyphs[base - 1] = matra;
|
|
charIndices[base - 1] = mIndex;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|