+++ /dev/null
-/*
- *
- * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved
- *
- */
-
-#include "LETypes.h"
-#include "LEGlyphFilter.h"
-#include "OpenTypeTables.h"
-#include "LEGlyphStorage.h"
-#include "ThaiShaping.h"
-
-U_NAMESPACE_BEGIN
-
-enum {
- CH_SPACE = 0x0020,
- CH_YAMAKKAN = 0x0E4E,
- CH_MAI_HANAKAT = 0x0E31,
- CH_SARA_AA = 0x0E32,
- CH_SARA_AM = 0x0E33,
- CH_SARA_UEE = 0x0E37,
- CH_MAITAIKHU = 0x0E47,
- CH_NIKHAHIT = 0x0E4D,
- CH_SARA_U = 0x0E38,
- CH_PHINTHU = 0x0E3A,
- CH_YO_YING = 0x0E0D,
- CH_THO_THAN = 0x0E10,
- CH_DOTTED_CIRCLE = 0x25CC
-};
-
- le_uint8 ThaiShaping::getCharClass(LEUnicode ch)
-{
- le_uint8 charClass = NON;
-
- if (ch >= 0x0E00 && ch <= 0x0E5B) {
- charClass = classTable[ch - 0x0E00];
- }
-
- return charClass;
-}
-
-
-LEUnicode ThaiShaping::leftAboveVowel(LEUnicode vowel, le_uint8 glyphSet)
-{
- static const LEUnicode leftAboveVowels[][7] = {
- {0x0E61, 0x0E32, 0x0E33, 0x0E64, 0x0E65, 0x0E66, 0x0E67},
- {0xF710, 0x0E32, 0x0E33, 0xF701, 0xF702, 0xF703, 0xF704},
- {0xF884, 0x0E32, 0x0E33, 0xF885, 0xF886, 0xF887, 0xF788},
- {0x0E31, 0x0E32, 0x0E33, 0x0E34, 0x0E35, 0x0E36, 0x0E37}
- };
-
- if (vowel >= CH_MAI_HANAKAT && vowel <= CH_SARA_UEE) {
- return leftAboveVowels[glyphSet][vowel - CH_MAI_HANAKAT];
- }
-
- if (vowel == CH_YAMAKKAN && glyphSet == 0) {
- return 0x0E7E;
- }
-
- return vowel;
-}
-
-LEUnicode ThaiShaping::lowerRightTone(LEUnicode tone, le_uint8 glyphSet)
-{
- static const LEUnicode lowerRightTones[][7] = {
- {0x0E68, 0x0E69, 0x0E6A, 0x0E6B, 0x0E6C, 0x0E6D, 0x0E6E},
- {0x0E47, 0xF70A, 0xF70B, 0xF70C, 0xF70D, 0xF70E, 0x0E4D},
- {0x0E47, 0xF88B, 0xF88E, 0xF891, 0xF894, 0xF897, 0x0E4D},
- {0x0E47, 0x0E48, 0x0E49, 0x0E4A, 0x0E4B, 0x0E4C, 0x0E4D}
- };
-
- if (tone >= CH_MAITAIKHU && tone <= CH_NIKHAHIT) {
- return lowerRightTones[glyphSet][tone - CH_MAITAIKHU];
- }
-
- return tone;
-}
-
-LEUnicode ThaiShaping::lowerLeftTone(LEUnicode tone, le_uint8 glyphSet)
-{
- static const LEUnicode lowerLeftTones[][7] = {
- {0x0E76, 0x0E77, 0x0E78, 0x0E79, 0x0E7A, 0x0E7B, 0x0E7C},
- {0xF712, 0xF705, 0xF706, 0xF707, 0xF708, 0xF709, 0xF711},
- {0xF889, 0xF88C, 0xF88F, 0xF892, 0xF895, 0xF898, 0xF899},
- {0x0E47, 0x0E48, 0x0E49, 0x0E4A, 0x0E4B, 0x0E4C, 0x0E4D}
- };
-
- if (tone >= CH_MAITAIKHU && tone <= CH_NIKHAHIT) {
- return lowerLeftTones[glyphSet][tone - CH_MAITAIKHU];
- }
-
- return tone;
-}
-
-LEUnicode ThaiShaping::upperLeftTone(LEUnicode tone, le_uint8 glyphSet)
-{
- static const LEUnicode upperLeftTones[][7] = {
- {0x0E6F, 0x0E70, 0x0E71, 0x0E72, 0x0E73, 0x0E74, 0x0E75},
- {0xF712, 0xF713, 0xF714, 0xF715, 0xF716, 0xF717, 0xF711},
- {0xF889, 0xF88A, 0xF88D, 0xF890, 0xF893, 0xF896, 0xF899},
- {0x0E47, 0x0E48, 0x0E49, 0x0E4A, 0x0E4B, 0x0E4C, 0x0E4D}
- };
-
- if (tone >= CH_MAITAIKHU && tone <= CH_NIKHAHIT) {
- return upperLeftTones[glyphSet][tone - CH_MAITAIKHU];
- }
-
- return tone;
-}
-
-LEUnicode ThaiShaping::lowerBelowVowel(LEUnicode vowel, le_uint8 glyphSet)
-{
- static const LEUnicode lowerBelowVowels[][3] = {
- {0x0E3C, 0x0E3D, 0x0E3E},
- {0xF718, 0xF719, 0xF71A},
- {0x0E38, 0x0E39, 0x0E3A},
- {0x0E38, 0x0E39, 0x0E3A}
-
- };
-
- if (vowel >= CH_SARA_U && vowel <= CH_PHINTHU) {
- return lowerBelowVowels[glyphSet][vowel - CH_SARA_U];
- }
-
- return vowel;
-}
-
-LEUnicode ThaiShaping::noDescenderCOD(LEUnicode cod, le_uint8 glyphSet)
-{
- static const LEUnicode noDescenderCODs[][4] = {
- {0x0E60, 0x0E0E, 0x0E0F, 0x0E63},
- {0xF70F, 0x0E0E, 0x0E0F, 0xF700},
- {0x0E0D, 0x0E0E, 0x0E0F, 0x0E10},
- {0x0E0D, 0x0E0E, 0x0E0F, 0x0E10}
-
- };
-
- if (cod >= CH_YO_YING && cod <= CH_THO_THAN) {
- return noDescenderCODs[glyphSet][cod - CH_YO_YING];
- }
-
- return cod;
-}
-
-le_uint8 ThaiShaping::doTransition (StateTransition transition, LEUnicode currChar, le_int32 inputIndex, le_uint8 glyphSet,
- LEUnicode errorChar, LEUnicode *outputBuffer, LEGlyphStorage &glyphStorage, le_int32 &outputIndex)
-{
- LEErrorCode success = LE_NO_ERROR;
-
- switch (transition.action) {
- case tA:
- glyphStorage.setCharIndex(outputIndex, inputIndex, success);
- outputBuffer[outputIndex++] = currChar;
- break;
-
- case tC:
- glyphStorage.setCharIndex(outputIndex, inputIndex, success);
- outputBuffer[outputIndex++] = currChar;
- break;
-
- case tD:
- glyphStorage.setCharIndex(outputIndex, inputIndex, success);
- outputBuffer[outputIndex++] = leftAboveVowel(currChar, glyphSet);
- break;
-
- case tE:
- glyphStorage.setCharIndex(outputIndex, inputIndex, success);
- outputBuffer[outputIndex++] = lowerRightTone(currChar, glyphSet);
- break;
-
- case tF:
- glyphStorage.setCharIndex(outputIndex, inputIndex, success);
- outputBuffer[outputIndex++] = lowerLeftTone(currChar, glyphSet);
- break;
-
- case tG:
- glyphStorage.setCharIndex(outputIndex, inputIndex, success);
- outputBuffer[outputIndex++] = upperLeftTone(currChar, glyphSet);
- break;
-
- case tH:
- {
- LEUnicode cod = outputBuffer[outputIndex - 1];
- LEUnicode coa = noDescenderCOD(cod, glyphSet);
-
- if (cod != coa) {
- outputBuffer[outputIndex - 1] = coa;
-
- glyphStorage.setCharIndex(outputIndex, inputIndex, success);
- outputBuffer[outputIndex++] = currChar;
- break;
- }
-
- glyphStorage.setCharIndex(outputIndex, inputIndex, success);
- outputBuffer[outputIndex++] = lowerBelowVowel(currChar, glyphSet);
- break;
- }
-
- case tR:
- glyphStorage.setCharIndex(outputIndex, inputIndex, success);
- outputBuffer[outputIndex++] = errorChar;
-
- glyphStorage.setCharIndex(outputIndex, inputIndex, success);
- outputBuffer[outputIndex++] = currChar;
- break;
-
- case tS:
- if (currChar == CH_SARA_AM) {
- glyphStorage.setCharIndex(outputIndex, inputIndex, success);
- outputBuffer[outputIndex++] = errorChar;
- }
-
- glyphStorage.setCharIndex(outputIndex, inputIndex, success);
- outputBuffer[outputIndex++] = currChar;
- break;
-
- default:
- // FIXME: if we get here, there's an error
- // in the state table!
- glyphStorage.setCharIndex(outputIndex, inputIndex, success);
- outputBuffer[outputIndex++] = currChar;
- break;
- }
-
- return transition.nextState;
-}
-
-le_uint8 ThaiShaping::getNextState(LEUnicode ch, le_uint8 prevState, le_int32 inputIndex, le_uint8 glyphSet, LEUnicode errorChar,
- le_uint8 &charClass, LEUnicode *output, LEGlyphStorage &glyphStorage, le_int32 &outputIndex)
-{
- StateTransition transition;
-
- charClass = getCharClass(ch);
- transition = getTransition(prevState, charClass);
-
- return doTransition(transition, ch, inputIndex, glyphSet, errorChar, output, glyphStorage, outputIndex);
-}
-
-le_bool ThaiShaping::isLegalHere(LEUnicode ch, le_uint8 prevState)
-{
- le_uint8 charClass = getCharClass(ch);
- StateTransition transition = getTransition(prevState, charClass);
-
- switch (transition.action) {
- case tA:
- case tC:
- case tD:
- case tE:
- case tF:
- case tG:
- case tH:
- return TRUE;
-
- case tR:
- case tS:
- return FALSE;
-
- default:
- // FIXME: if we get here, there's an error
- // in the state table!
- return FALSE;
- }
-}
-
-le_int32 ThaiShaping::compose(const LEUnicode *input, le_int32 offset, le_int32 charCount, le_uint8 glyphSet,
- LEUnicode errorChar, LEUnicode *output, LEGlyphStorage &glyphStorage)
-{
- le_uint8 state = 0;
- le_int32 inputIndex;
- le_int32 outputIndex = 0;
- le_uint8 conState = 0xFF;
- le_int32 conInput = -1;
- le_int32 conOutput = -1;
-
- for (inputIndex = 0; inputIndex < charCount; inputIndex += 1) {
- LEUnicode ch = input[inputIndex + offset];
- le_uint8 charClass;
-
- // Decompose SARA AM into NIKHAHIT + SARA AA
- if (ch == CH_SARA_AM && isLegalHere(ch, state)) {
- outputIndex = conOutput;
- state = getNextState(CH_NIKHAHIT, conState, inputIndex, glyphSet, errorChar, charClass,
- output, glyphStorage, outputIndex);
-
- for (int j = conInput + 1; j < inputIndex; j += 1) {
- ch = input[j + offset];
- state = getNextState(ch, state, j, glyphSet, errorChar, charClass,
- output, glyphStorage, outputIndex);
- }
-
- ch = CH_SARA_AA;
- }
-
- state = getNextState(ch, state, inputIndex, glyphSet, errorChar, charClass,
- output, glyphStorage, outputIndex);
-
- if (charClass >= CON && charClass <= COD) {
- conState = state;
- conInput = inputIndex;
- conOutput = outputIndex;
- }
- }
-
- return outputIndex;
-}
-
-U_NAMESPACE_END
projects / apple / icu.git / blobdiff