le_int32 IndicReordering::reorder(const LEUnicode *chars, le_int32 charCount, le_int32 scriptCode,
LEUnicode *outChars, LEGlyphStorage &glyphStorage,
MPreFixups **outMPreFixups, LEErrorCode& success)
{
if (LE_FAILURE(success)) {
return 0;
}
MPreFixups *mpreFixups = NULL;
const IndicClassTable *classTable = IndicClassTable::getScriptClassTable(scriptCode);
if (classTable->scriptFlags & SF_MPRE_FIXUP) {
mpreFixups = new MPreFixups(charCount);
if (mpreFixups == NULL) {
success = LE_MEMORY_ALLOCATION_ERROR;
return 0;
}
}
IndicReorderingOutput output(outChars, glyphStorage, mpreFixups);
le_int32 i, prev = 0;
le_bool lastInWord = FALSE;
while (prev < charCount) {
le_int32 syllable = findSyllable(classTable, chars, prev, charCount);
le_int32 matra, markStart = syllable;
output.reset();
if (classTable->isStressMark(chars[markStart - 1])) {
markStart -= 1;
output.noteStressMark(classTable, chars[markStart], markStart, tagArray1);
}
if (markStart != prev && classTable->isVowelModifier(chars[markStart - 1])) {
markStart -= 1;
output.noteVowelModifier(classTable, chars[markStart], markStart, tagArray1);
}
matra = markStart - 1;
while (output.noteMatra(classTable, chars[matra], matra, tagArray1, !lastInWord) && matra != prev) {
matra -= 1;
}
lastInWord = TRUE;
switch (classTable->getCharClass(chars[prev]) & CF_CLASS_MASK) {
case CC_RESERVED:
lastInWord = FALSE;
/* fall through */
case CC_INDEPENDENT_VOWEL:
case CC_ZERO_WIDTH_MARK:
for (i = prev; i < syllable; i += 1) {
output.writeChar(chars[i], i, tagArray1);
}
break;
case CC_AL_LAKUNA:
case CC_NUKTA:
output.writeChar(C_DOTTED_CIRCLE, prev, tagArray1);
output.writeChar(chars[prev], prev, tagArray1);
break;
case CC_VIRAMA:
// A lone virama is illegal unless it follows a
// MALAYALAM_VOWEL_SIGN_U. Such a usage is called
// "samvruthokaram".
if (chars[prev - 1] != C_MALAYALAM_VOWEL_SIGN_U) {
output.writeChar(C_DOTTED_CIRCLE, prev, tagArray1);
}
output.writeChar(chars[prev], prev, tagArray1);
break;
case CC_DEPENDENT_VOWEL:
case CC_SPLIT_VOWEL_PIECE_1:
case CC_SPLIT_VOWEL_PIECE_2:
case CC_SPLIT_VOWEL_PIECE_3:
case CC_VOWEL_MODIFIER:
case CC_STRESS_MARK:
output.writeMpre();
output.writeChar(C_DOTTED_CIRCLE, prev, tagArray1);
output.writeMbelow();
output.writeSMbelow();
output.writeMabove();
if ((classTable->scriptFlags & SF_MATRAS_AFTER_BASE) != 0) {
output.writeMpost();
}
if ((classTable->scriptFlags & SF_REPH_AFTER_BELOW) != 0) {
output.writeVMabove();
output.writeSMabove(); // FIXME: there are no SM's in these scripts...
}
if ((classTable->scriptFlags & SF_MATRAS_AFTER_BASE) == 0) {
output.writeMpost();
}
output.writeLengthMark();
output.writeAlLakuna();
if ((classTable->scriptFlags & SF_REPH_AFTER_BELOW) == 0) {
output.writeVMabove();
output.writeSMabove();
}
output.writeVMpost();
break;
case CC_INDEPENDENT_VOWEL_2:
case CC_INDEPENDENT_VOWEL_3:
case CC_CONSONANT:
case CC_CONSONANT_WITH_NUKTA:
{
le_uint32 length = markStart - prev;
le_int32 lastConsonant = markStart - 1;
le_int32 baseLimit = prev;
// Check for REPH at front of syllable
if (length > 2 && classTable->isReph(chars[prev]) && classTable->isVirama(chars[prev + 1]) && chars[prev + 2] != C_SIGN_ZWNJ) {
baseLimit += 2;
// Check for eyelash RA, if the script supports it
if ((classTable->scriptFlags & SF_EYELASH_RA) != 0 &&
chars[baseLimit] == C_SIGN_ZWJ) {
if (length > 3) {
baseLimit += 1;
} else {
baseLimit -= 2;
}
}
}
while (lastConsonant > baseLimit && !classTable->isConsonant(chars[lastConsonant])) {
lastConsonant -= 1;
}
IndicClassTable::CharClass charClass = CC_RESERVED;
IndicClassTable::CharClass nextClass = CC_RESERVED;
le_int32 baseConsonant = lastConsonant;
le_int32 postBase = lastConsonant + 1;
le_int32 postBaseLimit = classTable->scriptFlags & SF_POST_BASE_LIMIT_MASK;
le_bool seenVattu = FALSE;
le_bool seenBelowBaseForm = FALSE;
le_bool hasNukta = FALSE;
le_bool hasBelowBaseForm = FALSE;
le_bool hasPostBaseForm = FALSE;
if (postBase < markStart && classTable->isNukta(chars[postBase])) {
charClass = CC_NUKTA;
postBase += 1;
}
while (baseConsonant > baseLimit) {
nextClass = charClass;
hasNukta = IndicClassTable::isNukta(nextClass);
charClass = classTable->getCharClass(chars[baseConsonant]);
hasBelowBaseForm = IndicClassTable::hasBelowBaseForm(charClass) && !hasNukta;
hasPostBaseForm = IndicClassTable::hasPostBaseForm(charClass) && !hasNukta;
if (IndicClassTable::isConsonant(charClass)) {
if (postBaseLimit == 0 || seenVattu ||
(baseConsonant > baseLimit && !classTable->isVirama(chars[baseConsonant - 1])) ||
!(hasBelowBaseForm || hasPostBaseForm)) {
break;
}
// consonants with nuktas are never vattus
seenVattu = IndicClassTable::isVattu(charClass) && !hasNukta;
// consonants with nuktas never have below- or post-base forms
if (hasPostBaseForm) {
if (seenBelowBaseForm) {
break;
}
postBase = baseConsonant;
} else if (hasBelowBaseForm) {
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, tagArray2);
output.writeChar(chars[prev + 1], prev + 1, tagArray2);
output.writeChar(chars[prev + 2], prev + 2, tagArray2);
}
// 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.
FeatureMask features = (i == baseLimit? tagArray2 : tagArray1);
charClass = classTable->getCharClass(ch);
nextClass = classTable->getCharClass(chars[i + 1]);
hasNukta = IndicClassTable::isNukta(nextClass);
if (IndicClassTable::isConsonant(charClass)) {
if (IndicClassTable::isVattu(charClass) && !hasNukta && supressVattu) {
features = tagArray4;
}
supressVattu = IndicClassTable::isVattu(charClass) && !hasNukta;
} else if (IndicClassTable::isVirama(charClass) && chars[i + 1] == C_SIGN_ZWNJ)
{
features = tagArray4;
}
output.writeChar(ch, i, features);
}
le_int32 bcSpan = baseConsonant + 1;
if (bcSpan < markStart && classTable->isNukta(chars[bcSpan])) {
bcSpan += 1;
}
if (baseConsonant == lastConsonant && bcSpan < markStart &&
(classTable->isVirama(chars[bcSpan]) || classTable->isAlLakuna(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, tagArray4);
}
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, tagArray1);
}
if (postBase > lastConsonant) {
// write halant that was after base consonant
output.writeChar(chars[bcSpan], bcSpan, tagArray1);
}
}
// 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, tagArray0);
output.writeChar(chars[prev + 1], prev + 1, tagArray0);
}
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, tagArray3);
}
// write halant that was after base consonant
output.writeChar(chars[bcSpan], bcSpan, tagArray1);
}
// write the training halant, if there is one
if (lastConsonant < matra && classTable->isVirama(chars[matra])) {
output.writeChar(chars[matra], matra, tagArray4);
}
}
// write Mpost
if ((classTable->scriptFlags & SF_MATRAS_AFTER_BASE) == 0) {
output.writeMpost();
}
output.writeLengthMark();
output.writeAlLakuna();
// write reph
if ((classTable->scriptFlags & SF_REPH_AFTER_BELOW) == 0) {
if (baseLimit == prev + 2) {
output.writeChar(chars[prev], prev, tagArray0);
output.writeChar(chars[prev + 1], prev + 1, tagArray0);
}
output.writeVMabove();
output.writeSMabove();
}
output.writeVMpost();
break;
}
default:
break;
}
prev = syllable;
}
*outMPreFixups = mpreFixups;
return output.getOutputIndex();
}
le_int32 KhmerReordering::reorder(const LEUnicode *chars, le_int32 charCount,
le_int32 /*scriptCode*/, LEUnicode *outChars, LEGlyphStorage &glyphStorage)
{
const KhmerClassTable *classTable = KhmerClassTable::getKhmerClassTable();
ReorderingOutput output(outChars, glyphStorage);
KhmerClassTable::CharClass charClass;
le_int32 i, prev = 0, coengRo;
// This loop only exits when we reach the end of a run, which may contain
// several syllables.
while (prev < charCount) {
le_int32 syllable = findSyllable(classTable, chars, prev, charCount);
// write a pre vowel or the pre part of a split vowel first
// and look out for coeng + ro. RO is the only vowel of type 2, and
// therefore the only one that requires saving space before the base.
coengRo = -1; // There is no Coeng Ro, if found this value will change
for (i = prev; i < syllable; i += 1) {
charClass = classTable->getCharClass(chars[i]);
// if a split vowel, write the pre part. In Khmer the pre part
// is the same for all split vowels, same glyph as pre vowel C_VOWEL_E
if (charClass & KhmerClassTable::CF_SPLIT_VOWEL) {
output.writeChar(C_VOWEL_E, i, tagPref);
break; // there can be only one vowel
}
// if a vowel with pos before write it out
if (charClass & KhmerClassTable::CF_POS_BEFORE) {
output.writeChar(chars[i], i, tagPref);
break; // there can be only one vowel
}
// look for coeng + ro and remember position
// works because coeng + ro is always in front of a vowel (if there is a vowel)
// and because CC_CONSONANT2 is enough to identify it, as it is the only consonant
// with this flag
if ( (charClass & KhmerClassTable::CF_COENG) && (i + 1 < syllable) &&
( (classTable->getCharClass(chars[i + 1]) &
KhmerClassTable::CF_CLASS_MASK) == KhmerClassTable::CC_CONSONANT2) )
{
coengRo = i;
}
}
// write coeng + ro if found
if (coengRo > -1) {
output.writeChar(C_COENG, coengRo, tagPref);
output.writeChar(C_RO, coengRo + 1, tagPref);
}
// shall we add a dotted circle? If in the position in which
// the base should be (first char in the string) there is a
// character that has the Dotted circle flag (a character that
// cannot be a base) then write a dotted circle
if (classTable->getCharClass(chars[prev]) & KhmerClassTable::CF_DOTTED_CIRCLE) {
output.writeChar(C_DOTTED_CIRCLE, prev, tagDefault);
}
// copy what is left to the output, skipping before vowels and
// coeng Ro if they are present
for (i = prev; i < syllable; i += 1) {
charClass = classTable->getCharClass(chars[i]);
// skip a before vowel, it was already processed
if (charClass & KhmerClassTable::CF_POS_BEFORE) {
continue;
}
// skip coeng + ro, it was already processed
if (i == coengRo) {
i += 1;
continue;
}
switch (charClass & KhmerClassTable::CF_POS_MASK) {
case KhmerClassTable::CF_POS_ABOVE :
output.writeChar(chars[i], i, tagAbvf);
break;
case KhmerClassTable::CF_POS_AFTER :
output.writeChar(chars[i], i, tagPstf);
break;
case KhmerClassTable::CF_POS_BELOW :
output.writeChar(chars[i], i, tagBlwf);
break;
default:
// assign the correct flags to a coeng consonant
// Consonants of type 3 are taged as Post forms and those type 1 as below forms
if ( (charClass & KhmerClassTable::CF_COENG) && i + 1 < syllable ) {
if ( (classTable->getCharClass(chars[i + 1]) & KhmerClassTable::CF_CLASS_MASK)
== KhmerClassTable::CC_CONSONANT3) {
output.writeChar(chars[i], i, tagPstf);
i += 1;
output.writeChar(chars[i], i, tagPstf);
}
else {
output.writeChar(chars[i], i, tagBlwf);
i += 1;
output.writeChar(chars[i], i, tagBlwf);
}
break;
}
// if a shifter is followed by an above vowel change the shifter to below form,
// an above vowel can have two possible positions i + 1 or i + 3
// (position i+1 corresponds to unicode 3, position i+3 to Unicode 4)
// and there is an extra rule for C_VOWEL_AA + C_SIGN_NIKAHIT also for two
// different positions, right after the shifter or after a vowel (Unicode 4)
if ( (charClass & KhmerClassTable::CF_SHIFTER) && (i + 1 < syllable) ) {
if (classTable->getCharClass(chars[i + 1]) & KhmerClassTable::CF_ABOVE_VOWEL ) {
output.writeChar(chars[i], i, tagBlwf);
break;
}
if (i + 2 < syllable &&
( (classTable->getCharClass(chars[i + 1]) &
KhmerClassTable::CF_CLASS_MASK) == C_VOWEL_AA) &&
( (classTable->getCharClass(chars[i + 2]) &
KhmerClassTable::CF_CLASS_MASK) == C_SIGN_NIKAHIT) )
{
output.writeChar(chars[i], i, tagBlwf);
break;
}
if (i + 3 < syllable && (classTable->getCharClass(chars[i + 3]) &
KhmerClassTable::CF_ABOVE_VOWEL) )
{
output.writeChar(chars[i], i, tagBlwf);
break;
}
if (i + 4 < syllable &&
( (classTable->getCharClass(chars[i + 3]) &
KhmerClassTable::CF_CLASS_MASK) == C_VOWEL_AA) &&
( (classTable->getCharClass(chars[i + 4]) &
KhmerClassTable::CF_CLASS_MASK) == C_SIGN_NIKAHIT) )
{
output.writeChar(chars[i], i, tagBlwf);
break;
}
}
// default - any other characters
output.writeChar(chars[i], i, tagDefault);
break;
} // switch
} // for
prev = syllable; // move the pointer to the start of next syllable
}
return output.getOutputIndex();
}
le_int32 IndicReordering::v2process(const LEUnicode *chars, le_int32 charCount, le_int32 scriptCode,
LEUnicode *outChars, LEGlyphStorage &glyphStorage)
{
const IndicClassTable *classTable = IndicClassTable::getScriptClassTable(scriptCode);
DynamicProperties dynProps[INDIC_BLOCK_SIZE];
IndicReordering::getDynamicProperties(dynProps,classTable);
IndicReorderingOutput output(outChars, glyphStorage, NULL);
le_int32 i, firstConsonant, baseConsonant, secondConsonant, inv_count = 0, beginSyllable = 0;
//le_bool lastInWord = FALSE;
while (beginSyllable < charCount) {
le_int32 nextSyllable = findSyllable(classTable, chars, beginSyllable, charCount);
output.reset();
// Find the First Consonant
for ( firstConsonant = beginSyllable ; firstConsonant < nextSyllable ; firstConsonant++ ) {
if ( classTable->isConsonant(chars[firstConsonant]) ) {
break;
}
}
// Find the base consonant
baseConsonant = nextSyllable - 1;
secondConsonant = firstConsonant;
// TODO: Use Dynamic Properties for hasBelowBaseForm and hasPostBaseForm()
while ( baseConsonant > firstConsonant ) {
if ( classTable->isConsonant(chars[baseConsonant]) &&
!classTable->hasBelowBaseForm(chars[baseConsonant]) &&
!classTable->hasPostBaseForm(chars[baseConsonant]) ) {
break;
}
else {
if ( classTable->isConsonant(chars[baseConsonant]) ) {
secondConsonant = baseConsonant;
}
baseConsonant--;
}
}
// If the syllable starts with Ra + Halant ( in a script that has Reph ) and has more than one
// consonant, Ra is excluced from candidates for base consonants
if ( classTable->isReph(chars[beginSyllable]) &&
beginSyllable+1 < nextSyllable && classTable->isVirama(chars[beginSyllable+1]) &&
secondConsonant != firstConsonant) {
baseConsonant = secondConsonant;
}
// Populate the output
for ( i = beginSyllable ; i < nextSyllable ; i++ ) {
// Handle invalid combinartions
if ( classTable->isVirama(chars[beginSyllable]) ||
classTable->isMatra(chars[beginSyllable]) ||
classTable->isVowelModifier(chars[beginSyllable]) ||
classTable->isNukta(chars[beginSyllable]) ) {
output.writeChar(C_DOTTED_CIRCLE,beginSyllable,basicShapingFormsMask);
inv_count++;
}
output.writeChar(chars[i],i, basicShapingFormsMask);
}
// Adjust features and set syllable structure bits
for ( i = beginSyllable ; i < nextSyllable ; i++ ) {
FeatureMask outMask = output.getFeatures(i+inv_count);
FeatureMask saveMask = outMask;
// Since reph can only validly occur at the beginning of a syllable
// We only apply it to the first 2 characters in the syllable, to keep it from
// conflicting with other features ( i.e. rkrf )
// TODO : Use the dynamic property for determining isREPH
if ( i == beginSyllable && i < baseConsonant && classTable->isReph(chars[i]) &&
i+1 < nextSyllable && classTable->isVirama(chars[i+1])) {
outMask |= rphfFeatureMask;
outMask |= rephConsonantMask;
output.setFeatures(i+1+inv_count,outMask);
}
if ( i == baseConsonant ) {
outMask |= baseConsonantMask;
}
if ( classTable->isMatra(chars[i])) {
outMask |= matraMask;
if ( classTable->hasAboveBaseForm(chars[i])) {
outMask |= aboveBasePosition;
} else if ( classTable->hasBelowBaseForm(chars[i])) {
outMask |= belowBasePosition;
}
}
// Don't apply half form to virama that stands alone at the end of a syllable
// to prevent half forms from forming when syllable ends with virama
if ( classTable->isVirama(chars[i]) && (i+1 == nextSyllable) ) {
outMask ^= halfFeatureMask;
if ( classTable->isConsonant(chars[i-1]) ) {
FeatureMask tmp = output.getFeatures(i-1+inv_count);
tmp ^= halfFeatureMask;
output.setFeatures(i-1+inv_count,tmp);
}
}
if ( outMask != saveMask ) {
output.setFeatures(i+inv_count,outMask);
}
}
output.decomposeReorderMatras(classTable,beginSyllable,nextSyllable,inv_count);
beginSyllable = nextSyllable;
}
return output.getOutputIndex();
}
