690 lines
21 KiB
C++
690 lines
21 KiB
C++
/*
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*
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* (C) Copyright IBM Corp. 1998-2005 - 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 "LEGlyphStorage.h"
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#include "MPreFixups.h"
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U_NAMESPACE_BEGIN
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class ReorderingOutput : public UMemory {
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private:
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le_int32 fOutIndex;
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LEUnicode *fOutChars;
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LEGlyphStorage &fGlyphStorage;
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LEUnicode fMpre;
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le_int32 fMpreIndex;
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LEUnicode fMbelow;
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le_int32 fMbelowIndex;
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LEUnicode fMabove;
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le_int32 fMaboveIndex;
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LEUnicode fMpost;
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le_int32 fMpostIndex;
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LEUnicode fLengthMark;
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le_int32 fLengthMarkIndex;
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LEUnicode fVirama;
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le_int32 fViramaIndex;
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const LETag *fMatraTags;
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le_int32 fMPreOutIndex;
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MPreFixups *fMPreFixups;
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LEUnicode fVMabove;
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LEUnicode fVMpost;
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le_int32 fVMIndex;
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const LETag *fVMTags;
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LEUnicode fSMabove;
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LEUnicode fSMbelow;
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le_int32 fSMIndex;
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const LETag *fSMTags;
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void saveMatra(LEUnicode matra, le_int32 matraIndex, 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::isLengthMark(matraClass)) {
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fLengthMark = matra;
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fLengthMarkIndex = matraIndex;
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} else if (IndicClassTable::isVirama(matraClass)) {
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fVirama = matra;
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fViramaIndex = matraIndex;
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} else {
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switch (matraClass & CF_POS_MASK) {
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case CF_POS_BEFORE:
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fMpre = matra;
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fMpreIndex = matraIndex;
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break;
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case CF_POS_BELOW:
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fMbelow = matra;
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fMbelowIndex = matraIndex;
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break;
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case CF_POS_ABOVE:
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fMabove = matra;
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fMaboveIndex = matraIndex;
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break;
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case CF_POS_AFTER:
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fMpost = matra;
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fMpostIndex = matraIndex;
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break;
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default:
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// can't get here...
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break;
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}
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}
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}
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public:
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ReorderingOutput(LEUnicode *outChars, LEGlyphStorage &glyphStorage, MPreFixups *mpreFixups)
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: fOutIndex(0), fOutChars(outChars), fGlyphStorage(glyphStorage),
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fMpre(0), fMpreIndex(0), fMbelow(0), fMbelowIndex(0), fMabove(0), fMaboveIndex(0),
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fMpost(0), fMpostIndex(0), fLengthMark(0), fLengthMarkIndex(0), fVirama(0), fViramaIndex(0),
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fMatraTags(NULL), fMPreOutIndex(-1), fMPreFixups(mpreFixups),
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fVMabove(0), fVMpost(0), fVMIndex(0), fVMTags(NULL),
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fSMabove(0), fSMbelow(0), fSMIndex(0), fSMTags(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 reset()
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{
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fMpre = fMbelow = fMabove = fMpost = fLengthMark = fVirama = 0;
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fMPreOutIndex = -1;
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fVMabove = fVMpost = 0;
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fSMabove = fSMbelow = 0;
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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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LEErrorCode success = LE_NO_ERROR;
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fOutChars[fOutIndex] = ch;
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fGlyphStorage.setCharIndex(fOutIndex, charIndex, success);
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fGlyphStorage.setAuxData(fOutIndex, (void *) charTags, success);
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fOutIndex += 1;
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}
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le_bool 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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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, matraIndex, pieceClass);
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}
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} else {
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saveMatra(matra, matraIndex, matraClass);
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}
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return TRUE;
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}
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return FALSE;
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}
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void noteVowelModifier(const IndicClassTable *classTable, LEUnicode vowelModifier, le_uint32 vowelModifierIndex, const LETag *vowelModifierTags)
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{
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IndicClassTable::CharClass vmClass = classTable->getCharClass(vowelModifier);
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fVMIndex = vowelModifierIndex;
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fVMTags = vowelModifierTags;
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if (IndicClassTable::isVowelModifier(vmClass)) {
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switch (vmClass & CF_POS_MASK) {
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case CF_POS_ABOVE:
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fVMabove = vowelModifier;
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break;
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case CF_POS_AFTER:
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fVMpost = vowelModifier;
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break;
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default:
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// FIXME: this is an error...
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break;
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}
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}
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}
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void noteStressMark(const IndicClassTable *classTable, LEUnicode stressMark, le_uint32 stressMarkIndex, const LETag *stressMarkTags)
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{
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IndicClassTable::CharClass smClass = classTable->getCharClass(stressMark);
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fSMIndex = stressMarkIndex;
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fSMTags = stressMarkTags;
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if (IndicClassTable::isStressMark(smClass)) {
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switch (smClass & CF_POS_MASK) {
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case CF_POS_ABOVE:
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fSMabove = stressMark;
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break;
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case CF_POS_BELOW:
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fSMbelow = stressMark;
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break;
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default:
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// FIXME: this is an error...
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break;
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}
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}
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}
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void noteBaseConsonant()
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{
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if (fMPreFixups != NULL && fMPreOutIndex >= 0) {
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fMPreFixups->add(fOutIndex, fMPreOutIndex);
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}
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}
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// Handles virama in Sinhala split vowels.
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void writeVirama()
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{
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if (fVirama != 0) {
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writeChar(fVirama, fViramaIndex, fMatraTags);
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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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fMPreOutIndex = fOutIndex;
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writeChar(fMpre, fMpreIndex, 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, fMbelowIndex, 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, fMaboveIndex, 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, fMpostIndex, 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, fLengthMarkIndex, fMatraTags);
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}
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}
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void writeVMabove()
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{
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if (fVMabove != 0) {
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writeChar(fVMabove, fVMIndex, fVMTags);
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}
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}
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void writeVMpost()
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{
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if (fVMpost != 0) {
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writeChar(fVMpost, fVMIndex, fVMTags);
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}
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}
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void writeSMabove()
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{
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if (fSMabove != 0) {
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writeChar(fSMabove, fSMIndex, fSMTags);
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}
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}
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void writeSMbelow()
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{
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if (fSMbelow != 0) {
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writeChar(fSMbelow, fSMIndex, fSMTags);
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}
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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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static const LETag emptyTag = 0x00000000; // ''
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static const LETag nuktFeatureTag = LE_NUKT_FEATURE_TAG;
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static const LETag akhnFeatureTag = LE_AKHN_FEATURE_TAG;
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static const LETag rphfFeatureTag = LE_RPHF_FEATURE_TAG;
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static const LETag blwfFeatureTag = LE_BLWF_FEATURE_TAG;
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static const LETag halfFeatureTag = LE_HALF_FEATURE_TAG;
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static const LETag pstfFeatureTag = LE_PSTF_FEATURE_TAG;
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static const LETag vatuFeatureTag = LE_VATU_FEATURE_TAG;
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static const LETag presFeatureTag = LE_PRES_FEATURE_TAG;
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static const LETag blwsFeatureTag = LE_BLWS_FEATURE_TAG;
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static const LETag abvsFeatureTag = LE_ABVS_FEATURE_TAG;
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static const LETag pstsFeatureTag = LE_PSTS_FEATURE_TAG;
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static const LETag halnFeatureTag = LE_HALN_FEATURE_TAG;
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static const LETag blwmFeatureTag = LE_BLWM_FEATURE_TAG;
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static const LETag abvmFeatureTag = LE_ABVM_FEATURE_TAG;
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static const LETag distFeatureTag = LE_DIST_FEATURE_TAG;
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// These are in the order in which the features need to be applied
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// for correct processing
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static const LETag featureOrder[] =
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{
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nuktFeatureTag, akhnFeatureTag, rphfFeatureTag, blwfFeatureTag, halfFeatureTag, pstfFeatureTag,
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vatuFeatureTag, presFeatureTag, blwsFeatureTag, abvsFeatureTag, pstsFeatureTag, halnFeatureTag,
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blwmFeatureTag, abvmFeatureTag, distFeatureTag, emptyTag
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};
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// The order of these is determined so that the tag array of each glyph can start
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// at an offset into this array
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// FIXME: do we want a seperate tag array for each kind of character??
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// FIXME: are there cases where this ordering causes glyphs to get tags
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// that they shouldn't?
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static const LETag tagArray[] =
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{
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rphfFeatureTag, blwfFeatureTag, halfFeatureTag, pstfFeatureTag, nuktFeatureTag, akhnFeatureTag,
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vatuFeatureTag, presFeatureTag, blwsFeatureTag, abvsFeatureTag, pstsFeatureTag, halnFeatureTag,
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blwmFeatureTag, abvmFeatureTag, distFeatureTag, emptyTag
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};
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static const le_int8 stateTable[][CC_COUNT] =
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{
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// xx vm sm iv i2 ct cn nu dv s1 s2 s3 vr zw
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{ 1, 1, 1, 5, 8, 3, 2, 1, 5, 9, 5, 1, 1, 1}, // 0 - ground state
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{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1}, // 1 - exit state
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{-1, 6, 1, -1, -1, -1, -1, -1, 5, 9, 5, 5, 4, -1}, // 2 - consonant with nukta
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{-1, 6, 1, -1, -1, -1, -1, 2, 5, 9, 5, 5, 4, -1}, // 3 - consonant
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{-1, -1, -1, -1, -1, 3, 2, -1, -1, -1, -1, -1, -1, 7}, // 4 - consonant virama
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{-1, 6, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1}, // 5 - dependent vowels
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{-1, -1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1}, // 6 - vowel mark
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{-1, -1, -1, -1, -1, 3, 2, -1, -1, -1, -1, -1, -1, -1}, // 7 - ZWJ, ZWNJ
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{-1, 6, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 4, -1}, // 8 - independent vowels that can take a virama
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{-1, 6, 1, -1, -1, -1, -1, -1, -1, -1, 10, 5, -1, -1}, // 9 - first part of split vowel
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{-1, 6, 1, -1, -1, -1, -1, -1, -1, -1, -1, 5, -1, -1} // 10 - second part of split vowel
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};
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const LETag *IndicReordering::getFeatureOrder()
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{
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return featureOrder;
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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 & 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,
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LEUnicode *outChars, LEGlyphStorage &glyphStorage,
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MPreFixups **outMPreFixups)
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{
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MPreFixups *mpreFixups = NULL;
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const IndicClassTable *classTable = IndicClassTable::getScriptClassTable(scriptCode);
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if (classTable->scriptFlags & SF_MPRE_FIXUP) {
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mpreFixups = new MPreFixups(charCount);
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}
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ReorderingOutput output(outChars, glyphStorage, mpreFixups);
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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, markStart = syllable;
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output.reset();
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if (classTable->isStressMark(chars[markStart - 1])) {
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markStart -= 1;
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output.noteStressMark(classTable, chars[markStart], markStart, &tagArray[1]);
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}
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if (classTable->isVowelModifier(chars[markStart - 1])) {
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markStart -= 1;
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output.noteVowelModifier(classTable, chars[markStart], markStart, &tagArray[1]);
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}
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matra = markStart - 1;
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while (output.noteMatra(classTable, chars[matra], matra, &tagArray[1]) && matra != prev) {
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matra -= 1;
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}
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switch (classTable->getCharClass(chars[prev]) & CF_CLASS_MASK) {
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case CC_RESERVED:
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case CC_INDEPENDENT_VOWEL:
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case 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 CC_NUKTA:
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case 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 CC_DEPENDENT_VOWEL:
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case CC_SPLIT_VOWEL_PIECE_1:
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case CC_SPLIT_VOWEL_PIECE_2:
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case CC_SPLIT_VOWEL_PIECE_3:
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case CC_VOWEL_MODIFIER:
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case CC_STRESS_MARK:
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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.writeSMbelow();
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output.writeMabove();
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if ((classTable->scriptFlags & SF_MATRAS_AFTER_BASE) != 0) {
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output.writeMpost();
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}
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if ((classTable->scriptFlags & SF_REPH_AFTER_BELOW) != 0) {
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output.writeVMabove();
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output.writeSMabove(); // FIXME: there are no SM's in these scripts...
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}
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if ((classTable->scriptFlags & 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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output.writeVirama();
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if ((classTable->scriptFlags & SF_REPH_AFTER_BELOW) == 0) {
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output.writeVMabove();
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output.writeSMabove();
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}
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output.writeVMpost();
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break;
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case CC_INDEPENDENT_VOWEL_2:
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case CC_CONSONANT:
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case CC_CONSONANT_WITH_NUKTA:
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{
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le_uint32 length = markStart - prev;
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le_int32 lastConsonant = markStart - 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 += 2;
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// Check for eyelash RA, if the script supports it
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if ((classTable->scriptFlags & SF_EYELASH_RA) != 0 &&
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chars[baseLimit] == 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 -= 2;
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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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le_int32 postBaseLimit = classTable->scriptFlags & 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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if (postBase < markStart && classTable->isNukta(chars[postBase])) {
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postBase += 1;
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}
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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)) {
|
|
if (postBaseLimit == 0 || seenVattu ||
|
|
(baseConsonant > baseLimit && !classTable->isVirama(chars[baseConsonant - 1])) ||
|
|
!IndicClassTable::hasPostOrBelowBaseForm(charClass)) {
|
|
break;
|
|
}
|
|
|
|
seenVattu = IndicClassTable::isVattu(charClass);
|
|
|
|
if (IndicClassTable::hasPostBaseForm(charClass)) {
|
|
if (seenBelowBaseForm) {
|
|
break;
|
|
}
|
|
|
|
postBase = baseConsonant;
|
|
} else if (IndicClassTable::hasBelowBaseForm(charClass)) {
|
|
seenBelowBaseForm = TRUE;
|
|
}
|
|
|
|
postBaseLimit -= 1;
|
|
}
|
|
|
|
baseConsonant -= 1;
|
|
}
|
|
|
|
// Write Mpre
|
|
output.writeMpre();
|
|
|
|
// Write eyelash RA
|
|
// NOTE: baseLimit == prev + 3 iff eyelash RA present...
|
|
if (baseLimit == prev + 3) {
|
|
output.writeChar(chars[prev], prev, &tagArray[2]);
|
|
output.writeChar(chars[prev + 1], prev + 1, &tagArray[2]);
|
|
output.writeChar(chars[prev + 2], prev + 2, &tagArray[2]);
|
|
}
|
|
|
|
// write any pre-base consonants
|
|
le_bool supressVattu = TRUE;
|
|
|
|
for (i = baseLimit; i < baseConsonant; i += 1) {
|
|
LEUnicode ch = chars[i];
|
|
// Don't put 'blwf' on first consonant.
|
|
const LETag *tag = (i == baseLimit? &tagArray[2] : &tagArray[1]);
|
|
IndicClassTable::CharClass charClass = classTable->getCharClass(ch);
|
|
|
|
if (IndicClassTable::isConsonant(charClass)) {
|
|
if (IndicClassTable::isVattu(charClass) && supressVattu) {
|
|
tag = &tagArray[4];
|
|
}
|
|
|
|
supressVattu = IndicClassTable::isVattu(charClass);
|
|
} else if (IndicClassTable::isVirama(charClass) && chars[i + 1] == C_SIGN_ZWNJ)
|
|
{
|
|
tag = &tagArray[4];
|
|
}
|
|
|
|
output.writeChar(ch, i, tag);
|
|
}
|
|
|
|
le_int32 bcSpan = baseConsonant + 1;
|
|
|
|
if (bcSpan < markStart && classTable->isNukta(chars[bcSpan])) {
|
|
bcSpan += 1;
|
|
}
|
|
|
|
if (baseConsonant == lastConsonant && bcSpan < markStart && classTable->isVirama(chars[bcSpan])) {
|
|
bcSpan += 1;
|
|
|
|
if (bcSpan < markStart && chars[bcSpan] == C_SIGN_ZWNJ) {
|
|
bcSpan += 1;
|
|
}
|
|
}
|
|
|
|
// note the base consonant for post-GSUB fixups
|
|
output.noteBaseConsonant();
|
|
|
|
// write base consonant
|
|
for (i = baseConsonant; i < bcSpan; i += 1) {
|
|
output.writeChar(chars[i], i, &tagArray[4]);
|
|
}
|
|
|
|
if ((classTable->scriptFlags & SF_MATRAS_AFTER_BASE) != 0) {
|
|
output.writeMbelow();
|
|
output.writeSMbelow(); // FIXME: there are no SMs in these scripts...
|
|
output.writeMabove();
|
|
output.writeMpost();
|
|
}
|
|
|
|
// write below-base consonants
|
|
if (baseConsonant != lastConsonant) {
|
|
for (i = bcSpan + 1; i < postBase; i += 1) {
|
|
output.writeChar(chars[i], i, &tagArray[1]);
|
|
}
|
|
|
|
if (postBase > lastConsonant) {
|
|
// write halant that was after base consonant
|
|
output.writeChar(chars[bcSpan], bcSpan, &tagArray[1]);
|
|
}
|
|
}
|
|
|
|
// write Mbelow, SMbelow, Mabove
|
|
if ((classTable->scriptFlags & SF_MATRAS_AFTER_BASE) == 0) {
|
|
output.writeMbelow();
|
|
output.writeSMbelow();
|
|
output.writeMabove();
|
|
}
|
|
|
|
if ((classTable->scriptFlags & SF_REPH_AFTER_BELOW) != 0) {
|
|
if (baseLimit == prev + 2) {
|
|
output.writeChar(chars[prev], prev, &tagArray[0]);
|
|
output.writeChar(chars[prev + 1], prev + 1, &tagArray[0]);
|
|
}
|
|
|
|
output.writeVMabove();
|
|
output.writeSMabove(); // FIXME: there are no SM's in these scripts...
|
|
}
|
|
|
|
// write post-base consonants
|
|
// FIXME: does this put the right tags on post-base consonants?
|
|
if (baseConsonant != lastConsonant) {
|
|
if (postBase <= lastConsonant) {
|
|
for (i = postBase; i <= lastConsonant; i += 1) {
|
|
output.writeChar(chars[i], i, &tagArray[3]);
|
|
}
|
|
|
|
// write halant that was after base consonant
|
|
output.writeChar(chars[bcSpan], bcSpan, &tagArray[1]);
|
|
}
|
|
|
|
// write the training halant, if there is one
|
|
if (lastConsonant < matra && classTable->isVirama(chars[matra])) {
|
|
output.writeChar(chars[matra], matra, &tagArray[4]);
|
|
}
|
|
}
|
|
|
|
// write Mpost
|
|
if ((classTable->scriptFlags & SF_MATRAS_AFTER_BASE) == 0) {
|
|
output.writeMpost();
|
|
}
|
|
|
|
output.writeLengthMark();
|
|
output.writeVirama();
|
|
|
|
// write reph
|
|
if ((classTable->scriptFlags & SF_REPH_AFTER_BELOW) == 0) {
|
|
if (baseLimit == prev + 2) {
|
|
output.writeChar(chars[prev], prev, &tagArray[0]);
|
|
output.writeChar(chars[prev + 1], prev + 1, &tagArray[0]);
|
|
}
|
|
|
|
output.writeVMabove();
|
|
output.writeSMabove();
|
|
}
|
|
|
|
output.writeVMpost();
|
|
|
|
break;
|
|
}
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
prev = syllable;
|
|
}
|
|
|
|
*outMPreFixups = mpreFixups;
|
|
|
|
return output.getOutputIndex();
|
|
}
|
|
|
|
void IndicReordering::adjustMPres(MPreFixups *mpreFixups, LEGlyphStorage &glyphStorage)
|
|
{
|
|
if (mpreFixups != NULL) {
|
|
mpreFixups->apply(glyphStorage);
|
|
|
|
delete mpreFixups;
|
|
}
|
|
}
|
|
|
|
U_NAMESPACE_END
|