746 lines
28 KiB
C++
746 lines
28 KiB
C++
/*
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*******************************************************************************
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*
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* Copyright (C) 2009-2011, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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*******************************************************************************
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* file name: normalizer2impl.h
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* encoding: US-ASCII
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2009nov22
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* created by: Markus W. Scherer
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*/
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#ifndef __NORMALIZER2IMPL_H__
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#define __NORMALIZER2IMPL_H__
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_NORMALIZATION
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#include "unicode/normalizer2.h"
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#include "unicode/udata.h"
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#include "unicode/unistr.h"
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#include "unicode/unorm.h"
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#include "mutex.h"
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#include "uset_imp.h"
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#include "utrie2.h"
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U_NAMESPACE_BEGIN
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struct CanonIterData;
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class Hangul {
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public:
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/* Korean Hangul and Jamo constants */
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enum {
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JAMO_L_BASE=0x1100, /* "lead" jamo */
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JAMO_V_BASE=0x1161, /* "vowel" jamo */
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JAMO_T_BASE=0x11a7, /* "trail" jamo */
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HANGUL_BASE=0xac00,
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JAMO_L_COUNT=19,
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JAMO_V_COUNT=21,
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JAMO_T_COUNT=28,
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JAMO_VT_COUNT=JAMO_V_COUNT*JAMO_T_COUNT,
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HANGUL_COUNT=JAMO_L_COUNT*JAMO_V_COUNT*JAMO_T_COUNT,
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HANGUL_LIMIT=HANGUL_BASE+HANGUL_COUNT
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};
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static inline UBool isHangul(UChar32 c) {
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return HANGUL_BASE<=c && c<HANGUL_LIMIT;
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}
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static inline UBool
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isHangulWithoutJamoT(UChar c) {
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c-=HANGUL_BASE;
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return c<HANGUL_COUNT && c%JAMO_T_COUNT==0;
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}
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static inline UBool isJamoL(UChar32 c) {
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return (uint32_t)(c-JAMO_L_BASE)<JAMO_L_COUNT;
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}
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static inline UBool isJamoV(UChar32 c) {
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return (uint32_t)(c-JAMO_V_BASE)<JAMO_V_COUNT;
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}
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/**
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* Decomposes c, which must be a Hangul syllable, into buffer
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* and returns the length of the decomposition (2 or 3).
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*/
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static inline int32_t decompose(UChar32 c, UChar buffer[3]) {
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c-=HANGUL_BASE;
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UChar32 c2=c%JAMO_T_COUNT;
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c/=JAMO_T_COUNT;
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buffer[0]=(UChar)(JAMO_L_BASE+c/JAMO_V_COUNT);
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buffer[1]=(UChar)(JAMO_V_BASE+c%JAMO_V_COUNT);
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if(c2==0) {
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return 2;
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} else {
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buffer[2]=(UChar)(JAMO_T_BASE+c2);
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return 3;
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}
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}
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private:
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Hangul(); // no instantiation
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};
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class Normalizer2Impl;
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class ReorderingBuffer : public UMemory {
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public:
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ReorderingBuffer(const Normalizer2Impl &ni, UnicodeString &dest) :
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impl(ni), str(dest),
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start(NULL), reorderStart(NULL), limit(NULL),
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remainingCapacity(0), lastCC(0) {}
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~ReorderingBuffer() {
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if(start!=NULL) {
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str.releaseBuffer((int32_t)(limit-start));
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}
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}
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UBool init(int32_t destCapacity, UErrorCode &errorCode);
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UBool isEmpty() const { return start==limit; }
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int32_t length() const { return (int32_t)(limit-start); }
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UChar *getStart() { return start; }
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UChar *getLimit() { return limit; }
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uint8_t getLastCC() const { return lastCC; }
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UBool equals(const UChar *start, const UChar *limit) const;
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// For Hangul composition, replacing the Leading consonant Jamo with the syllable.
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void setLastChar(UChar c) {
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*(limit-1)=c;
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}
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UBool append(UChar32 c, uint8_t cc, UErrorCode &errorCode) {
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return (c<=0xffff) ?
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appendBMP((UChar)c, cc, errorCode) :
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appendSupplementary(c, cc, errorCode);
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}
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// s must be in NFD, otherwise change the implementation.
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UBool append(const UChar *s, int32_t length,
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uint8_t leadCC, uint8_t trailCC,
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UErrorCode &errorCode);
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UBool appendBMP(UChar c, uint8_t cc, UErrorCode &errorCode) {
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if(remainingCapacity==0 && !resize(1, errorCode)) {
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return FALSE;
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}
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if(lastCC<=cc || cc==0) {
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*limit++=c;
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lastCC=cc;
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if(cc<=1) {
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reorderStart=limit;
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}
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} else {
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insert(c, cc);
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}
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--remainingCapacity;
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return TRUE;
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}
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UBool appendZeroCC(UChar32 c, UErrorCode &errorCode);
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UBool appendZeroCC(const UChar *s, const UChar *sLimit, UErrorCode &errorCode);
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void remove();
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void removeSuffix(int32_t suffixLength);
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void setReorderingLimit(UChar *newLimit) {
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remainingCapacity+=(int32_t)(limit-newLimit);
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reorderStart=limit=newLimit;
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lastCC=0;
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}
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void copyReorderableSuffixTo(UnicodeString &s) const {
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s.setTo(reorderStart, (int32_t)(limit-reorderStart));
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}
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private:
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/*
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* TODO: Revisit whether it makes sense to track reorderStart.
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* It is set to after the last known character with cc<=1,
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* which stops previousCC() before it reads that character and looks up its cc.
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* previousCC() is normally only called from insert().
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* In other words, reorderStart speeds up the insertion of a combining mark
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* into a multi-combining mark sequence where it does not belong at the end.
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* This might not be worth the trouble.
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* On the other hand, it's not a huge amount of trouble.
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*
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* We probably need it for UNORM_SIMPLE_APPEND.
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*/
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UBool appendSupplementary(UChar32 c, uint8_t cc, UErrorCode &errorCode);
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void insert(UChar32 c, uint8_t cc);
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static void writeCodePoint(UChar *p, UChar32 c) {
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if(c<=0xffff) {
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*p=(UChar)c;
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} else {
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p[0]=U16_LEAD(c);
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p[1]=U16_TRAIL(c);
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}
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}
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UBool resize(int32_t appendLength, UErrorCode &errorCode);
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const Normalizer2Impl &impl;
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UnicodeString &str;
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UChar *start, *reorderStart, *limit;
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int32_t remainingCapacity;
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uint8_t lastCC;
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// private backward iterator
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void setIterator() { codePointStart=limit; }
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void skipPrevious(); // Requires start<codePointStart.
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uint8_t previousCC(); // Returns 0 if there is no previous character.
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UChar *codePointStart, *codePointLimit;
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};
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class U_COMMON_API Normalizer2Impl : public UMemory {
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public:
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Normalizer2Impl() : memory(NULL), normTrie(NULL) {
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fcdTrieSingleton.fInstance=NULL;
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canonIterDataSingleton.fInstance=NULL;
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}
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~Normalizer2Impl();
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void load(const char *packageName, const char *name, UErrorCode &errorCode);
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void addPropertyStarts(const USetAdder *sa, UErrorCode &errorCode) const;
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void addCanonIterPropertyStarts(const USetAdder *sa, UErrorCode &errorCode) const;
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// low-level properties ------------------------------------------------ ***
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const UTrie2 *getNormTrie() const { return normTrie; }
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const UTrie2 *getFCDTrie(UErrorCode &errorCode) const ;
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UBool ensureCanonIterData(UErrorCode &errorCode) const;
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uint16_t getNorm16(UChar32 c) const { return UTRIE2_GET16(normTrie, c); }
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UNormalizationCheckResult getCompQuickCheck(uint16_t norm16) const {
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if(norm16<minNoNo || MIN_YES_YES_WITH_CC<=norm16) {
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return UNORM_YES;
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} else if(minMaybeYes<=norm16) {
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return UNORM_MAYBE;
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} else {
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return UNORM_NO;
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}
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}
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UBool isCompNo(uint16_t norm16) const { return minNoNo<=norm16 && norm16<minMaybeYes; }
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UBool isDecompYes(uint16_t norm16) const { return norm16<minYesNo || minMaybeYes<=norm16; }
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uint8_t getCC(uint16_t norm16) const {
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if(norm16>=MIN_NORMAL_MAYBE_YES) {
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return (uint8_t)norm16;
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}
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if(norm16<minNoNo || limitNoNo<=norm16) {
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return 0;
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}
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return getCCFromNoNo(norm16);
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}
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static uint8_t getCCFromYesOrMaybe(uint16_t norm16) {
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return norm16>=MIN_NORMAL_MAYBE_YES ? (uint8_t)norm16 : 0;
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}
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uint16_t getFCD16(UChar32 c) const { return UTRIE2_GET16(fcdTrie(), c); }
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uint16_t getFCD16FromSingleLead(UChar c) const {
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return UTRIE2_GET16_FROM_U16_SINGLE_LEAD(fcdTrie(), c);
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}
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uint16_t getFCD16FromSupplementary(UChar32 c) const {
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return UTRIE2_GET16_FROM_SUPP(fcdTrie(), c);
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}
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uint16_t getFCD16FromSurrogatePair(UChar c, UChar c2) const {
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return getFCD16FromSupplementary(U16_GET_SUPPLEMENTARY(c, c2));
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}
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void setFCD16FromNorm16(UChar32 start, UChar32 end, uint16_t norm16,
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UTrie2 *newFCDTrie, UErrorCode &errorCode) const;
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void makeCanonIterDataFromNorm16(UChar32 start, UChar32 end, uint16_t norm16,
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CanonIterData &newData, UErrorCode &errorCode) const;
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/**
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* Get the decomposition for one code point.
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* @param c code point
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* @param buffer out-only buffer for algorithmic decompositions
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* @param length out-only, takes the length of the decomposition, if any
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* @return pointer to the decomposition, or NULL if none
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*/
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const UChar *getDecomposition(UChar32 c, UChar buffer[4], int32_t &length) const;
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UBool isCanonSegmentStarter(UChar32 c) const;
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UBool getCanonStartSet(UChar32 c, UnicodeSet &set) const;
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enum {
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MIN_CCC_LCCC_CP=0x300
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};
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enum {
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MIN_YES_YES_WITH_CC=0xff01,
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JAMO_VT=0xff00,
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MIN_NORMAL_MAYBE_YES=0xfe00,
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JAMO_L=1,
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MAX_DELTA=0x40
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};
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enum {
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// Byte offsets from the start of the data, after the generic header.
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IX_NORM_TRIE_OFFSET,
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IX_EXTRA_DATA_OFFSET,
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IX_RESERVED2_OFFSET,
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IX_RESERVED3_OFFSET,
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IX_RESERVED4_OFFSET,
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IX_RESERVED5_OFFSET,
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IX_RESERVED6_OFFSET,
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IX_TOTAL_SIZE,
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// Code point thresholds for quick check codes.
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IX_MIN_DECOMP_NO_CP,
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IX_MIN_COMP_NO_MAYBE_CP,
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// Norm16 value thresholds for quick check combinations and types of extra data.
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IX_MIN_YES_NO,
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IX_MIN_NO_NO,
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IX_LIMIT_NO_NO,
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IX_MIN_MAYBE_YES,
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IX_RESERVED14,
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IX_RESERVED15,
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IX_COUNT
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};
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enum {
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MAPPING_HAS_CCC_LCCC_WORD=0x80,
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MAPPING_PLUS_COMPOSITION_LIST=0x40,
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MAPPING_NO_COMP_BOUNDARY_AFTER=0x20,
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MAPPING_LENGTH_MASK=0x1f
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};
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enum {
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COMP_1_LAST_TUPLE=0x8000,
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COMP_1_TRIPLE=1,
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COMP_1_TRAIL_LIMIT=0x3400,
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COMP_1_TRAIL_MASK=0x7ffe,
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COMP_1_TRAIL_SHIFT=9, // 10-1 for the "triple" bit
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COMP_2_TRAIL_SHIFT=6,
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COMP_2_TRAIL_MASK=0xffc0
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};
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// higher-level functionality ------------------------------------------ ***
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const UChar *decompose(const UChar *src, const UChar *limit,
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ReorderingBuffer *buffer, UErrorCode &errorCode) const;
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void decomposeAndAppend(const UChar *src, const UChar *limit,
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UBool doDecompose,
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UnicodeString &safeMiddle,
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ReorderingBuffer &buffer,
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UErrorCode &errorCode) const;
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UBool compose(const UChar *src, const UChar *limit,
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UBool onlyContiguous,
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UBool doCompose,
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ReorderingBuffer &buffer,
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UErrorCode &errorCode) const;
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const UChar *composeQuickCheck(const UChar *src, const UChar *limit,
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UBool onlyContiguous,
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UNormalizationCheckResult *pQCResult) const;
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void composeAndAppend(const UChar *src, const UChar *limit,
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UBool doCompose,
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UBool onlyContiguous,
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UnicodeString &safeMiddle,
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ReorderingBuffer &buffer,
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UErrorCode &errorCode) const;
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const UChar *makeFCD(const UChar *src, const UChar *limit,
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ReorderingBuffer *buffer, UErrorCode &errorCode) const;
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void makeFCDAndAppend(const UChar *src, const UChar *limit,
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UBool doMakeFCD,
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UnicodeString &safeMiddle,
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ReorderingBuffer &buffer,
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UErrorCode &errorCode) const;
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UBool hasDecompBoundary(UChar32 c, UBool before) const;
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UBool isDecompInert(UChar32 c) const { return isDecompYesAndZeroCC(getNorm16(c)); }
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UBool hasCompBoundaryBefore(UChar32 c) const {
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return c<minCompNoMaybeCP || hasCompBoundaryBefore(c, getNorm16(c));
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}
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UBool hasCompBoundaryAfter(UChar32 c, UBool onlyContiguous, UBool testInert) const;
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UBool hasFCDBoundaryBefore(UChar32 c) const { return c<MIN_CCC_LCCC_CP || getFCD16(c)<=0xff; }
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UBool hasFCDBoundaryAfter(UChar32 c) const {
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uint16_t fcd16=getFCD16(c);
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return fcd16<=1 || (fcd16&0xff)==0;
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}
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UBool isFCDInert(UChar32 c) const { return getFCD16(c)<=1; }
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private:
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static UBool U_CALLCONV
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isAcceptable(void *context, const char *type, const char *name, const UDataInfo *pInfo);
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UBool isMaybe(uint16_t norm16) const { return minMaybeYes<=norm16 && norm16<=JAMO_VT; }
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UBool isMaybeOrNonZeroCC(uint16_t norm16) const { return norm16>=minMaybeYes; }
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static UBool isInert(uint16_t norm16) { return norm16==0; }
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// static UBool isJamoL(uint16_t norm16) const { return norm16==1; }
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static UBool isJamoVT(uint16_t norm16) { return norm16==JAMO_VT; }
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UBool isHangul(uint16_t norm16) const { return norm16==minYesNo; }
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UBool isCompYesAndZeroCC(uint16_t norm16) const { return norm16<minNoNo; }
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// UBool isCompYes(uint16_t norm16) const {
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// return norm16>=MIN_YES_YES_WITH_CC || norm16<minNoNo;
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// }
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// UBool isCompYesOrMaybe(uint16_t norm16) const {
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// return norm16<minNoNo || minMaybeYes<=norm16;
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// }
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// UBool hasZeroCCFromDecompYes(uint16_t norm16) const {
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// return norm16<=MIN_NORMAL_MAYBE_YES || norm16==JAMO_VT;
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// }
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UBool isDecompYesAndZeroCC(uint16_t norm16) const {
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return norm16<minYesNo ||
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norm16==JAMO_VT ||
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(minMaybeYes<=norm16 && norm16<=MIN_NORMAL_MAYBE_YES);
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}
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/**
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* A little faster and simpler than isDecompYesAndZeroCC() but does not include
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* the MaybeYes which combine-forward and have ccc=0.
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* (Standard Unicode 5.2 normalization does not have such characters.)
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*/
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UBool isMostDecompYesAndZeroCC(uint16_t norm16) const {
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return norm16<minYesNo || norm16==MIN_NORMAL_MAYBE_YES || norm16==JAMO_VT;
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}
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UBool isDecompNoAlgorithmic(uint16_t norm16) const { return norm16>=limitNoNo; }
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// For use with isCompYes().
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// Perhaps the compiler can combine the two tests for MIN_YES_YES_WITH_CC.
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// static uint8_t getCCFromYes(uint16_t norm16) {
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// return norm16>=MIN_YES_YES_WITH_CC ? (uint8_t)norm16 : 0;
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// }
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uint8_t getCCFromNoNo(uint16_t norm16) const {
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const uint16_t *mapping=getMapping(norm16);
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if(*mapping&MAPPING_HAS_CCC_LCCC_WORD) {
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return (uint8_t)mapping[1];
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} else {
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return 0;
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}
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}
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// requires that the [cpStart..cpLimit[ character passes isCompYesAndZeroCC()
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uint8_t getTrailCCFromCompYesAndZeroCC(const UChar *cpStart, const UChar *cpLimit) const;
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// Requires algorithmic-NoNo.
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UChar32 mapAlgorithmic(UChar32 c, uint16_t norm16) const {
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return c+norm16-(minMaybeYes-MAX_DELTA-1);
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}
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// Requires minYesNo<norm16<limitNoNo.
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const uint16_t *getMapping(uint16_t norm16) const { return extraData+norm16; }
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const uint16_t *getCompositionsListForDecompYes(uint16_t norm16) const {
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if(norm16==0 || MIN_NORMAL_MAYBE_YES<=norm16) {
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return NULL;
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} else if(norm16<minMaybeYes) {
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return extraData+norm16; // for yesYes; if Jamo L: harmless empty list
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} else {
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return maybeYesCompositions+norm16-minMaybeYes;
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}
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}
|
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const uint16_t *getCompositionsListForComposite(uint16_t norm16) const {
|
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const uint16_t *list=extraData+norm16; // composite has both mapping & compositions list
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return list+ // mapping pointer
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1+ // +1 to skip the first unit with the mapping lenth
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(*list&MAPPING_LENGTH_MASK)+ // + mapping length
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((*list>>7)&1); // +1 if MAPPING_HAS_CCC_LCCC_WORD
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}
|
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/**
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* @param c code point must have compositions
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* @return compositions list pointer
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*/
|
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const uint16_t *getCompositionsList(uint16_t norm16) const {
|
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return isDecompYes(norm16) ?
|
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getCompositionsListForDecompYes(norm16) :
|
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getCompositionsListForComposite(norm16);
|
|
}
|
|
|
|
const UChar *copyLowPrefixFromNulTerminated(const UChar *src,
|
|
UChar32 minNeedDataCP,
|
|
ReorderingBuffer *buffer,
|
|
UErrorCode &errorCode) const;
|
|
UBool decomposeShort(const UChar *src, const UChar *limit,
|
|
ReorderingBuffer &buffer, UErrorCode &errorCode) const;
|
|
UBool decompose(UChar32 c, uint16_t norm16,
|
|
ReorderingBuffer &buffer, UErrorCode &errorCode) const;
|
|
|
|
static int32_t combine(const uint16_t *list, UChar32 trail);
|
|
void addComposites(const uint16_t *list, UnicodeSet &set) const;
|
|
void recompose(ReorderingBuffer &buffer, int32_t recomposeStartIndex,
|
|
UBool onlyContiguous) const;
|
|
|
|
UBool hasCompBoundaryBefore(UChar32 c, uint16_t norm16) const;
|
|
const UChar *findPreviousCompBoundary(const UChar *start, const UChar *p) const;
|
|
const UChar *findNextCompBoundary(const UChar *p, const UChar *limit) const;
|
|
|
|
const UTrie2 *fcdTrie() const { return (const UTrie2 *)fcdTrieSingleton.fInstance; }
|
|
|
|
const UChar *findPreviousFCDBoundary(const UChar *start, const UChar *p) const;
|
|
const UChar *findNextFCDBoundary(const UChar *p, const UChar *limit) const;
|
|
|
|
int32_t getCanonValue(UChar32 c) const;
|
|
const UnicodeSet &getCanonStartSet(int32_t n) const;
|
|
|
|
UDataMemory *memory;
|
|
UVersionInfo dataVersion;
|
|
|
|
// Code point thresholds for quick check codes.
|
|
UChar32 minDecompNoCP;
|
|
UChar32 minCompNoMaybeCP;
|
|
|
|
// Norm16 value thresholds for quick check combinations and types of extra data.
|
|
uint16_t minYesNo;
|
|
uint16_t minNoNo;
|
|
uint16_t limitNoNo;
|
|
uint16_t minMaybeYes;
|
|
|
|
UTrie2 *normTrie;
|
|
const uint16_t *maybeYesCompositions;
|
|
const uint16_t *extraData; // mappings and/or compositions for yesYes, yesNo & noNo characters
|
|
|
|
SimpleSingleton fcdTrieSingleton;
|
|
SimpleSingleton canonIterDataSingleton;
|
|
};
|
|
|
|
// bits in canonIterData
|
|
#define CANON_NOT_SEGMENT_STARTER 0x80000000
|
|
#define CANON_HAS_COMPOSITIONS 0x40000000
|
|
#define CANON_HAS_SET 0x200000
|
|
#define CANON_VALUE_MASK 0x1fffff
|
|
|
|
/**
|
|
* ICU-internal shortcut for quick access to standard Unicode normalization.
|
|
*/
|
|
class U_COMMON_API Normalizer2Factory {
|
|
public:
|
|
static const Normalizer2 *getNFCInstance(UErrorCode &errorCode);
|
|
static const Normalizer2 *getNFDInstance(UErrorCode &errorCode);
|
|
static const Normalizer2 *getFCDInstance(UErrorCode &errorCode);
|
|
static const Normalizer2 *getFCCInstance(UErrorCode &errorCode);
|
|
static const Normalizer2 *getNFKCInstance(UErrorCode &errorCode);
|
|
static const Normalizer2 *getNFKDInstance(UErrorCode &errorCode);
|
|
static const Normalizer2 *getNFKC_CFInstance(UErrorCode &errorCode);
|
|
static const Normalizer2 *getNoopInstance(UErrorCode &errorCode);
|
|
|
|
static const Normalizer2 *getInstance(UNormalizationMode mode, UErrorCode &errorCode);
|
|
|
|
static const Normalizer2Impl *getNFCImpl(UErrorCode &errorCode);
|
|
static const Normalizer2Impl *getNFKCImpl(UErrorCode &errorCode);
|
|
static const Normalizer2Impl *getNFKC_CFImpl(UErrorCode &errorCode);
|
|
|
|
// Get the Impl instance of the Normalizer2.
|
|
// Must be used only when it is known that norm2 is a Normalizer2WithImpl instance.
|
|
static const Normalizer2Impl *getImpl(const Normalizer2 *norm2);
|
|
|
|
static const UTrie2 *getFCDTrie(UErrorCode &errorCode);
|
|
private:
|
|
Normalizer2Factory(); // No instantiation.
|
|
};
|
|
|
|
U_NAMESPACE_END
|
|
|
|
U_CAPI int32_t U_EXPORT2
|
|
unorm2_swap(const UDataSwapper *ds,
|
|
const void *inData, int32_t length, void *outData,
|
|
UErrorCode *pErrorCode);
|
|
|
|
/**
|
|
* Get the NF*_QC property for a code point, for u_getIntPropertyValue().
|
|
* @internal
|
|
*/
|
|
U_CFUNC UNormalizationCheckResult U_EXPORT2
|
|
unorm_getQuickCheck(UChar32 c, UNormalizationMode mode);
|
|
|
|
/**
|
|
* Internal API, used by collation code.
|
|
* Get access to the internal FCD trie table to be able to perform
|
|
* incremental, per-code unit, FCD checks in collation.
|
|
* One pointer is sufficient because the trie index values are offset
|
|
* by the index size, so that the same pointer is used to access the trie data.
|
|
* Code points at fcdHighStart and above have a zero FCD value.
|
|
* @internal
|
|
*/
|
|
U_CAPI const uint16_t * U_EXPORT2
|
|
unorm_getFCDTrieIndex(UChar32 &fcdHighStart, UErrorCode *pErrorCode);
|
|
|
|
/**
|
|
* Internal API, used by collation code.
|
|
* Get the FCD value for a code unit, with
|
|
* bits 15..8 lead combining class
|
|
* bits 7..0 trail combining class
|
|
*
|
|
* If c is a lead surrogate and the value is not 0,
|
|
* then some of c's associated supplementary code points have a non-zero FCD value.
|
|
*
|
|
* @internal
|
|
*/
|
|
static inline uint16_t
|
|
unorm_getFCD16(const uint16_t *fcdTrieIndex, UChar c) {
|
|
return fcdTrieIndex[_UTRIE2_INDEX_FROM_U16_SINGLE_LEAD(fcdTrieIndex, c)];
|
|
}
|
|
|
|
/**
|
|
* Internal API, used by collation code.
|
|
* Get the FCD value of the next code point (post-increment), with
|
|
* bits 15..8 lead combining class
|
|
* bits 7..0 trail combining class
|
|
*
|
|
* @internal
|
|
*/
|
|
static inline uint16_t
|
|
unorm_nextFCD16(const uint16_t *fcdTrieIndex, UChar32 fcdHighStart,
|
|
const UChar *&s, const UChar *limit) {
|
|
UChar32 c=*s++;
|
|
uint16_t fcd=fcdTrieIndex[_UTRIE2_INDEX_FROM_U16_SINGLE_LEAD(fcdTrieIndex, c)];
|
|
if(fcd!=0 && U16_IS_LEAD(c)) {
|
|
UChar c2;
|
|
if(s!=limit && U16_IS_TRAIL(c2=*s)) {
|
|
++s;
|
|
c=U16_GET_SUPPLEMENTARY(c, c2);
|
|
if(c<fcdHighStart) {
|
|
fcd=fcdTrieIndex[_UTRIE2_INDEX_FROM_SUPP(fcdTrieIndex, c)];
|
|
} else {
|
|
fcd=0;
|
|
}
|
|
} else /* unpaired lead surrogate */ {
|
|
fcd=0;
|
|
}
|
|
}
|
|
return fcd;
|
|
}
|
|
|
|
/**
|
|
* Internal API, used by collation code.
|
|
* Get the FCD value of the previous code point (pre-decrement), with
|
|
* bits 15..8 lead combining class
|
|
* bits 7..0 trail combining class
|
|
*
|
|
* @internal
|
|
*/
|
|
static inline uint16_t
|
|
unorm_prevFCD16(const uint16_t *fcdTrieIndex, UChar32 fcdHighStart,
|
|
const UChar *start, const UChar *&s) {
|
|
UChar32 c=*--s;
|
|
uint16_t fcd;
|
|
if(!U16_IS_SURROGATE(c)) {
|
|
fcd=fcdTrieIndex[_UTRIE2_INDEX_FROM_U16_SINGLE_LEAD(fcdTrieIndex, c)];
|
|
} else {
|
|
UChar c2;
|
|
if(U16_IS_SURROGATE_TRAIL(c) && s!=start && U16_IS_LEAD(c2=*(s-1))) {
|
|
--s;
|
|
c=U16_GET_SUPPLEMENTARY(c2, c);
|
|
if(c<fcdHighStart) {
|
|
fcd=fcdTrieIndex[_UTRIE2_INDEX_FROM_SUPP(fcdTrieIndex, c)];
|
|
} else {
|
|
fcd=0;
|
|
}
|
|
} else /* unpaired surrogate */ {
|
|
fcd=0;
|
|
}
|
|
}
|
|
return fcd;
|
|
}
|
|
|
|
/**
|
|
* Format of Normalizer2 .nrm data files.
|
|
* Format version 1.0.
|
|
*
|
|
* Normalizer2 .nrm data files provide data for the Unicode Normalization algorithms.
|
|
* ICU ships with data files for standard Unicode Normalization Forms
|
|
* NFC and NFD (nfc.nrm), NFKC and NFKD (nfkc.nrm) and NFKC_Casefold (nfkc_cf.nrm).
|
|
* Custom (application-specific) data can be built into additional .nrm files
|
|
* with the gennorm2 build tool.
|
|
*
|
|
* Normalizer2.getInstance() causes a .nrm file to be loaded, unless it has been
|
|
* cached already. Internally, Normalizer2Impl.load() reads the .nrm file.
|
|
*
|
|
* A .nrm file begins with a standard ICU data file header
|
|
* (DataHeader, see ucmndata.h and unicode/udata.h).
|
|
* The UDataInfo.dataVersion field usually contains the Unicode version
|
|
* for which the data was generated.
|
|
*
|
|
* After the header, the file contains the following parts.
|
|
* Constants are defined as enum values of the Normalizer2Impl class.
|
|
*
|
|
* Many details of the data structures are described in the design doc
|
|
* which is at http://site.icu-project.org/design/normalization/custom
|
|
*
|
|
* int32_t indexes[indexesLength]; -- indexesLength=indexes[IX_NORM_TRIE_OFFSET]/4;
|
|
*
|
|
* The first eight indexes are byte offsets in ascending order.
|
|
* Each byte offset marks the start of the next part in the data file,
|
|
* and the end of the previous one.
|
|
* When two consecutive byte offsets are the same, then the corresponding part is empty.
|
|
* Byte offsets are offsets from after the header,
|
|
* that is, from the beginning of the indexes[].
|
|
* Each part starts at an offset with proper alignment for its data.
|
|
* If necessary, the previous part may include padding bytes to achieve this alignment.
|
|
*
|
|
* minDecompNoCP=indexes[IX_MIN_DECOMP_NO_CP] is the lowest code point
|
|
* with a decomposition mapping, that is, with NF*D_QC=No.
|
|
* minCompNoMaybeCP=indexes[IX_MIN_COMP_NO_MAYBE_CP] is the lowest code point
|
|
* with NF*C_QC=No (has a one-way mapping) or Maybe (combines backward).
|
|
*
|
|
* The next four indexes are thresholds of 16-bit trie values for ranges of
|
|
* values indicating multiple normalization properties.
|
|
* minYesNo=indexes[IX_MIN_YES_NO];
|
|
* minNoNo=indexes[IX_MIN_NO_NO];
|
|
* limitNoNo=indexes[IX_LIMIT_NO_NO];
|
|
* minMaybeYes=indexes[IX_MIN_MAYBE_YES];
|
|
* See the normTrie description below and the design doc for details.
|
|
*
|
|
* UTrie2 normTrie; -- see utrie2_impl.h and utrie2.h
|
|
*
|
|
* The trie holds the main normalization data. Each code point is mapped to a 16-bit value.
|
|
* Rather than using independent bits in the value (which would require more than 16 bits),
|
|
* information is extracted primarily via range checks.
|
|
* For example, a 16-bit value norm16 in the range minYesNo<=norm16<minNoNo
|
|
* means that the character has NF*C_QC=Yes and NF*D_QC=No properties,
|
|
* which means it has a two-way (round-trip) decomposition mapping.
|
|
* Values in the range 2<=norm16<limitNoNo are also directly indexes into the extraData
|
|
* pointing to mappings, composition lists, or both.
|
|
* Value norm16==0 means that the character is normalization-inert, that is,
|
|
* it does not have a mapping, does not participate in composition, has a zero
|
|
* canonical combining class, and forms a boundary where text before it and after it
|
|
* can be normalized independently.
|
|
* For details about how multiple properties are encoded in 16-bit values
|
|
* see the design doc.
|
|
* Note that the encoding cannot express all combinations of the properties involved;
|
|
* it only supports those combinations that are allowed by
|
|
* the Unicode Normalization algorithms. Details are in the design doc as well.
|
|
* The gennorm2 tool only builds .nrm files for data that conforms to the limitations.
|
|
*
|
|
* The trie has a value for each lead surrogate code unit representing the "worst case"
|
|
* properties of the 1024 supplementary characters whose UTF-16 form starts with
|
|
* the lead surrogate. If all of the 1024 supplementary characters are normalization-inert,
|
|
* then their lead surrogate code unit has the trie value 0.
|
|
* When the lead surrogate unit's value exceeds the quick check minimum during processing,
|
|
* the properties for the full supplementary code point need to be looked up.
|
|
*
|
|
* uint16_t maybeYesCompositions[MIN_NORMAL_MAYBE_YES-minMaybeYes];
|
|
* uint16_t extraData[];
|
|
*
|
|
* There is only one byte offset for the end of these two arrays.
|
|
* The split between them is given by the constant and variable mentioned above.
|
|
*
|
|
* The maybeYesCompositions array contains composition lists for characters that
|
|
* combine both forward (as starters in composition pairs)
|
|
* and backward (as trailing characters in composition pairs).
|
|
* Such characters do not occur in Unicode 5.2 but are allowed by
|
|
* the Unicode Normalization algorithms.
|
|
* If there are no such characters, then minMaybeYes==MIN_NORMAL_MAYBE_YES
|
|
* and the maybeYesCompositions array is empty.
|
|
* If there are such characters, then minMaybeYes is subtracted from their norm16 values
|
|
* to get the index into this array.
|
|
*
|
|
* The extraData array contains composition lists for "YesYes" characters,
|
|
* followed by mappings and optional composition lists for "YesNo" characters,
|
|
* followed by only mappings for "NoNo" characters.
|
|
* (Referring to pairs of NFC/NFD quick check values.)
|
|
* The norm16 values of those characters are directly indexes into the extraData array.
|
|
*
|
|
* The data structures for composition lists and mappings are described in the design doc.
|
|
*/
|
|
|
|
#endif /* !UCONFIG_NO_NORMALIZATION */
|
|
#endif /* __NORMALIZER2IMPL_H__ */
|