305 lines
7.7 KiB
C++
305 lines
7.7 KiB
C++
/*
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*
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* (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved
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*
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*/
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#ifndef __INDICREORDERING_H
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#define __INDICREORDERING_H
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/**
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* \file
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* \internal
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*/
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#include "LETypes.h"
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#include "OpenTypeTables.h"
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U_NAMESPACE_BEGIN
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// Characters that get refered to by name...
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enum
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{
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C_SIGN_ZWNJ = 0x200C,
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C_SIGN_ZWJ = 0x200D
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};
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typedef LEUnicode SplitMatra[3];
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class MPreFixups;
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class LEGlyphStorage;
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struct IndicClassTable
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{
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enum CharClassValues
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{
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CC_RESERVED = 0,
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CC_VOWEL_MODIFIER = 1,
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CC_STRESS_MARK = 2,
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CC_INDEPENDENT_VOWEL = 3,
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CC_INDEPENDENT_VOWEL_2 = 4,
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CC_CONSONANT = 5,
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CC_CONSONANT_WITH_NUKTA = 6,
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CC_NUKTA = 7,
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CC_DEPENDENT_VOWEL = 8,
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#if 1
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CC_SPLIT_VOWEL_PIECE_1 = 9,
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CC_SPLIT_VOWEL_PIECE_2 = 10,
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CC_SPLIT_VOWEL_PIECE_3 = 11,
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CC_VIRAMA = 12,
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CC_ZERO_WIDTH_MARK = 13,
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CC_COUNT = 14
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#else
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CC_VIRAMA = 9,
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CC_ZERO_WIDTH_MARK = 10,
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CC_COUNT = 11
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#endif
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};
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enum CharClassFlags
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{
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CF_CLASS_MASK = 0x0000FFFF,
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CF_CONSONANT = 0x80000000,
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CF_REPH = 0x40000000,
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CF_VATTU = 0x20000000,
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CF_BELOW_BASE = 0x10000000,
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CF_POST_BASE = 0x08000000,
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CF_LENGTH_MARK = 0x04000000,
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CF_POS_BEFORE = 0x00300000,
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CF_POS_BELOW = 0x00200000,
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CF_POS_ABOVE = 0x00100000,
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CF_POS_AFTER = 0x00000000,
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CF_POS_MASK = 0x00300000,
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CF_INDEX_MASK = 0x000F0000,
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CF_INDEX_SHIFT = 16
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};
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typedef le_uint32 CharClass;
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enum ScriptFlagBits
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{
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SF_MATRAS_AFTER_BASE = 0x80000000,
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SF_REPH_AFTER_BELOW = 0x40000000,
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SF_EYELASH_RA = 0x20000000,
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SF_MPRE_FIXUP = 0x10000000,
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SF_POST_BASE_LIMIT_MASK = 0x0000FFFF,
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SF_NO_POST_BASE_LIMIT = 0x00007FFF
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};
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typedef le_int32 ScriptFlags;
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LEUnicode firstChar;
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LEUnicode lastChar;
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le_int32 worstCaseExpansion;
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ScriptFlags scriptFlags;
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const CharClass *classTable;
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const SplitMatra *splitMatraTable;
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le_int32 getWorstCaseExpansion() const;
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CharClass getCharClass(LEUnicode ch) const;
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const SplitMatra *getSplitMatra(CharClass charClass) const;
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le_bool isVowelModifier(LEUnicode ch) const;
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le_bool isStressMark(LEUnicode ch) const;
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le_bool isConsonant(LEUnicode ch) const;
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le_bool isReph(LEUnicode ch) const;
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le_bool isVirama(LEUnicode ch) const;
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le_bool isNukta(LEUnicode ch) const;
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le_bool isVattu(LEUnicode ch) const;
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le_bool isMatra(LEUnicode ch) const;
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le_bool isSplitMatra(LEUnicode ch) const;
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le_bool isLengthMark(LEUnicode ch) const;
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le_bool hasPostOrBelowBaseForm(LEUnicode ch) const;
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le_bool hasPostBaseForm(LEUnicode ch) const;
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le_bool hasBelowBaseForm(LEUnicode ch) const;
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static le_bool isVowelModifier(CharClass charClass);
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static le_bool isStressMark(CharClass charClass);
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static le_bool isConsonant(CharClass charClass);
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static le_bool isReph(CharClass charClass);
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static le_bool isVirama(CharClass charClass);
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static le_bool isNukta(CharClass charClass);
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static le_bool isVattu(CharClass charClass);
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static le_bool isMatra(CharClass charClass);
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static le_bool isSplitMatra(CharClass charClass);
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static le_bool isLengthMark(CharClass charClass);
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static le_bool hasPostOrBelowBaseForm(CharClass charClass);
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static le_bool hasPostBaseForm(CharClass charClass);
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static le_bool hasBelowBaseForm(CharClass charClass);
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static const IndicClassTable *getScriptClassTable(le_int32 scriptCode);
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};
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class IndicReordering /* not : public UObject because all methods are static */ {
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public:
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static le_int32 getWorstCaseExpansion(le_int32 scriptCode);
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static le_int32 reorder(const LEUnicode *theChars, le_int32 charCount, le_int32 scriptCode,
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LEUnicode *outChars, LEGlyphStorage &glyphStorage,
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MPreFixups **outMPreFixups);
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static void adjustMPres(MPreFixups *mpreFixups, LEGlyphStorage &glyphStorage);
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static const LETag *getFeatureOrder();
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private:
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// do not instantiate
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IndicReordering();
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static le_int32 findSyllable(const IndicClassTable *classTable, const LEUnicode *chars, le_int32 prev, le_int32 charCount);
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};
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inline le_int32 IndicClassTable::getWorstCaseExpansion() const
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{
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return worstCaseExpansion;
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}
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inline const SplitMatra *IndicClassTable::getSplitMatra(CharClass charClass) const
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{
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le_int32 index = (charClass & CF_INDEX_MASK) >> CF_INDEX_SHIFT;
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return &splitMatraTable[index - 1];
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}
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inline le_bool IndicClassTable::isVowelModifier(CharClass charClass)
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{
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return (charClass & CF_CLASS_MASK) == CC_VOWEL_MODIFIER;
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}
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inline le_bool IndicClassTable::isStressMark(CharClass charClass)
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{
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return (charClass & CF_CLASS_MASK) == CC_STRESS_MARK;
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}
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inline le_bool IndicClassTable::isConsonant(CharClass charClass)
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{
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return (charClass & CF_CONSONANT) != 0;
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}
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inline le_bool IndicClassTable::isReph(CharClass charClass)
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{
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return (charClass & CF_REPH) != 0;
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}
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inline le_bool IndicClassTable::isNukta(CharClass charClass)
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{
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return (charClass & CF_CLASS_MASK) == CC_NUKTA;
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}
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inline le_bool IndicClassTable::isVirama(CharClass charClass)
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{
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return (charClass & CF_CLASS_MASK) == CC_VIRAMA;
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}
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inline le_bool IndicClassTable::isVattu(CharClass charClass)
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{
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return (charClass & CF_VATTU) != 0;
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}
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inline le_bool IndicClassTable::isMatra(CharClass charClass)
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{
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charClass &= CF_CLASS_MASK;
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return charClass >= CC_DEPENDENT_VOWEL && charClass <= CC_SPLIT_VOWEL_PIECE_3;
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}
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inline le_bool IndicClassTable::isSplitMatra(CharClass charClass)
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{
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return (charClass & CF_INDEX_MASK) != 0;
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}
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inline le_bool IndicClassTable::isLengthMark(CharClass charClass)
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{
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return (charClass & CF_LENGTH_MARK) != 0;
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}
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inline le_bool IndicClassTable::hasPostOrBelowBaseForm(CharClass charClass)
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{
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return (charClass & (CF_POST_BASE | CF_BELOW_BASE)) != 0;
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}
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inline le_bool IndicClassTable::hasPostBaseForm(CharClass charClass)
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{
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return (charClass & CF_POST_BASE) != 0;
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}
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inline le_bool IndicClassTable::hasBelowBaseForm(CharClass charClass)
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{
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return (charClass & CF_BELOW_BASE) != 0;
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}
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inline le_bool IndicClassTable::isVowelModifier(LEUnicode ch) const
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{
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return isVowelModifier(getCharClass(ch));
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}
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inline le_bool IndicClassTable::isStressMark(LEUnicode ch) const
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{
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return isStressMark(getCharClass(ch));
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}
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inline le_bool IndicClassTable::isConsonant(LEUnicode ch) const
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{
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return isConsonant(getCharClass(ch));
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}
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inline le_bool IndicClassTable::isReph(LEUnicode ch) const
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{
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return isReph(getCharClass(ch));
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}
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inline le_bool IndicClassTable::isVirama(LEUnicode ch) const
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{
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return isVirama(getCharClass(ch));
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}
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inline le_bool IndicClassTable::isNukta(LEUnicode ch) const
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{
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return isNukta(getCharClass(ch));
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}
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inline le_bool IndicClassTable::isVattu(LEUnicode ch) const
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{
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return isVattu(getCharClass(ch));
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}
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inline le_bool IndicClassTable::isMatra(LEUnicode ch) const
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{
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return isMatra(getCharClass(ch));
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}
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inline le_bool IndicClassTable::isSplitMatra(LEUnicode ch) const
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{
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return isSplitMatra(getCharClass(ch));
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}
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inline le_bool IndicClassTable::isLengthMark(LEUnicode ch) const
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{
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return isLengthMark(getCharClass(ch));
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}
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inline le_bool IndicClassTable::hasPostOrBelowBaseForm(LEUnicode ch) const
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{
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return hasPostOrBelowBaseForm(getCharClass(ch));
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}
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inline le_bool IndicClassTable::hasPostBaseForm(LEUnicode ch) const
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{
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return hasPostBaseForm(getCharClass(ch));
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}
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inline le_bool IndicClassTable::hasBelowBaseForm(LEUnicode ch) const
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{
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return hasBelowBaseForm(getCharClass(ch));
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}
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U_NAMESPACE_END
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#endif
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