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Diffstat (limited to 'intl/icu/source/common/ubidi.c')
| -rw-r--r-- | intl/icu/source/common/ubidi.c | 3015 |
1 files changed, 3015 insertions, 0 deletions
diff --git a/intl/icu/source/common/ubidi.c b/intl/icu/source/common/ubidi.c new file mode 100644 index 000000000..3c9497862 --- /dev/null +++ b/intl/icu/source/common/ubidi.c @@ -0,0 +1,3015 @@ +// Copyright (C) 2016 and later: Unicode, Inc. and others. +// License & terms of use: http://www.unicode.org/copyright.html +/* +****************************************************************************** +* +* Copyright (C) 1999-2015, International Business Machines +* Corporation and others. All Rights Reserved. +* +****************************************************************************** +* file name: ubidi.c +* encoding: US-ASCII +* tab size: 8 (not used) +* indentation:4 +* +* created on: 1999jul27 +* created by: Markus W. Scherer, updated by Matitiahu Allouche +* +*/ + +#include "cmemory.h" +#include "unicode/utypes.h" +#include "unicode/ustring.h" +#include "unicode/uchar.h" +#include "unicode/ubidi.h" +#include "unicode/utf16.h" +#include "ubidi_props.h" +#include "ubidiimp.h" +#include "uassert.h" + +/* + * General implementation notes: + * + * Throughout the implementation, there are comments like (W2) that refer to + * rules of the BiDi algorithm, in this example to the second rule of the + * resolution of weak types. + * + * For handling surrogate pairs, where two UChar's form one "abstract" (or UTF-32) + * character according to UTF-16, the second UChar gets the directional property of + * the entire character assigned, while the first one gets a BN, a boundary + * neutral, type, which is ignored by most of the algorithm according to + * rule (X9) and the implementation suggestions of the BiDi algorithm. + * + * Later, adjustWSLevels() will set the level for each BN to that of the + * following character (UChar), which results in surrogate pairs getting the + * same level on each of their surrogates. + * + * In a UTF-8 implementation, the same thing could be done: the last byte of + * a multi-byte sequence would get the "real" property, while all previous + * bytes of that sequence would get BN. + * + * It is not possible to assign all those parts of a character the same real + * property because this would fail in the resolution of weak types with rules + * that look at immediately surrounding types. + * + * As a related topic, this implementation does not remove Boundary Neutral + * types from the input, but ignores them wherever this is relevant. + * For example, the loop for the resolution of the weak types reads + * types until it finds a non-BN. + * Also, explicit embedding codes are neither changed into BN nor removed. + * They are only treated the same way real BNs are. + * As stated before, adjustWSLevels() takes care of them at the end. + * For the purpose of conformance, the levels of all these codes + * do not matter. + * + * Note that this implementation modifies the dirProps + * after the initial setup, when applying X5c (replace FSI by LRI or RLI), + * X6, N0 (replace paired brackets by L or R). + * + * In this implementation, the resolution of weak types (W1 to W6), + * neutrals (N1 and N2), and the assignment of the resolved level (In) + * are all done in one single loop, in resolveImplicitLevels(). + * Changes of dirProp values are done on the fly, without writing + * them back to the dirProps array. + * + * + * This implementation contains code that allows to bypass steps of the + * algorithm that are not needed on the specific paragraph + * in order to speed up the most common cases considerably, + * like text that is entirely LTR, or RTL text without numbers. + * + * Most of this is done by setting a bit for each directional property + * in a flags variable and later checking for whether there are + * any LTR characters or any RTL characters, or both, whether + * there are any explicit embedding codes, etc. + * + * If the (Xn) steps are performed, then the flags are re-evaluated, + * because they will then not contain the embedding codes any more + * and will be adjusted for override codes, so that subsequently + * more bypassing may be possible than what the initial flags suggested. + * + * If the text is not mixed-directional, then the + * algorithm steps for the weak type resolution are not performed, + * and all levels are set to the paragraph level. + * + * If there are no explicit embedding codes, then the (Xn) steps + * are not performed. + * + * If embedding levels are supplied as a parameter, then all + * explicit embedding codes are ignored, and the (Xn) steps + * are not performed. + * + * White Space types could get the level of the run they belong to, + * and are checked with a test of (flags&MASK_EMBEDDING) to + * consider if the paragraph direction should be considered in + * the flags variable. + * + * If there are no White Space types in the paragraph, then + * (L1) is not necessary in adjustWSLevels(). + */ + +/* to avoid some conditional statements, use tiny constant arrays */ +static const Flags flagLR[2]={ DIRPROP_FLAG(L), DIRPROP_FLAG(R) }; +static const Flags flagE[2]={ DIRPROP_FLAG(LRE), DIRPROP_FLAG(RLE) }; +static const Flags flagO[2]={ DIRPROP_FLAG(LRO), DIRPROP_FLAG(RLO) }; + +#define DIRPROP_FLAG_LR(level) flagLR[(level)&1] +#define DIRPROP_FLAG_E(level) flagE[(level)&1] +#define DIRPROP_FLAG_O(level) flagO[(level)&1] + +#define DIR_FROM_STRONG(strong) ((strong)==L ? L : R) + +#define NO_OVERRIDE(level) ((level)&~UBIDI_LEVEL_OVERRIDE) + +/* UBiDi object management -------------------------------------------------- */ + +U_CAPI UBiDi * U_EXPORT2 +ubidi_open(void) +{ + UErrorCode errorCode=U_ZERO_ERROR; + return ubidi_openSized(0, 0, &errorCode); +} + +U_CAPI UBiDi * U_EXPORT2 +ubidi_openSized(int32_t maxLength, int32_t maxRunCount, UErrorCode *pErrorCode) { + UBiDi *pBiDi; + + /* check the argument values */ + if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) { + return NULL; + } else if(maxLength<0 || maxRunCount<0) { + *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR; + return NULL; /* invalid arguments */ + } + + /* allocate memory for the object */ + pBiDi=(UBiDi *)uprv_malloc(sizeof(UBiDi)); + if(pBiDi==NULL) { + *pErrorCode=U_MEMORY_ALLOCATION_ERROR; + return NULL; + } + + /* reset the object, all pointers NULL, all flags FALSE, all sizes 0 */ + uprv_memset(pBiDi, 0, sizeof(UBiDi)); + + /* get BiDi properties */ + pBiDi->bdp=ubidi_getSingleton(); + + /* allocate memory for arrays as requested */ + if(maxLength>0) { + if( !getInitialDirPropsMemory(pBiDi, maxLength) || + !getInitialLevelsMemory(pBiDi, maxLength) + ) { + *pErrorCode=U_MEMORY_ALLOCATION_ERROR; + } + } else { + pBiDi->mayAllocateText=TRUE; + } + + if(maxRunCount>0) { + if(maxRunCount==1) { + /* use simpleRuns[] */ + pBiDi->runsSize=sizeof(Run); + } else if(!getInitialRunsMemory(pBiDi, maxRunCount)) { + *pErrorCode=U_MEMORY_ALLOCATION_ERROR; + } + } else { + pBiDi->mayAllocateRuns=TRUE; + } + + if(U_SUCCESS(*pErrorCode)) { + return pBiDi; + } else { + ubidi_close(pBiDi); + return NULL; + } +} + +/* + * We are allowed to allocate memory if memory==NULL or + * mayAllocate==TRUE for each array that we need. + * We also try to grow memory as needed if we + * allocate it. + * + * Assume sizeNeeded>0. + * If *pMemory!=NULL, then assume *pSize>0. + * + * ### this realloc() may unnecessarily copy the old data, + * which we know we don't need any more; + * is this the best way to do this?? + */ +U_CFUNC UBool +ubidi_getMemory(BidiMemoryForAllocation *bidiMem, int32_t *pSize, UBool mayAllocate, int32_t sizeNeeded) { + void **pMemory = (void **)bidiMem; + /* check for existing memory */ + if(*pMemory==NULL) { + /* we need to allocate memory */ + if(mayAllocate && (*pMemory=uprv_malloc(sizeNeeded))!=NULL) { + *pSize=sizeNeeded; + return TRUE; + } else { + return FALSE; + } + } else { + if(sizeNeeded<=*pSize) { + /* there is already enough memory */ + return TRUE; + } + else if(!mayAllocate) { + /* not enough memory, and we must not allocate */ + return FALSE; + } else { + /* we try to grow */ + void *memory; + /* in most cases, we do not need the copy-old-data part of + * realloc, but it is needed when adding runs using getRunsMemory() + * in setParaRunsOnly() + */ + if((memory=uprv_realloc(*pMemory, sizeNeeded))!=NULL) { + *pMemory=memory; + *pSize=sizeNeeded; + return TRUE; + } else { + /* we failed to grow */ + return FALSE; + } + } + } +} + +U_CAPI void U_EXPORT2 +ubidi_close(UBiDi *pBiDi) { + if(pBiDi!=NULL) { + pBiDi->pParaBiDi=NULL; /* in case one tries to reuse this block */ + if(pBiDi->dirPropsMemory!=NULL) { + uprv_free(pBiDi->dirPropsMemory); + } + if(pBiDi->levelsMemory!=NULL) { + uprv_free(pBiDi->levelsMemory); + } + if(pBiDi->openingsMemory!=NULL) { + uprv_free(pBiDi->openingsMemory); + } + if(pBiDi->parasMemory!=NULL) { + uprv_free(pBiDi->parasMemory); + } + if(pBiDi->runsMemory!=NULL) { + uprv_free(pBiDi->runsMemory); + } + if(pBiDi->isolatesMemory!=NULL) { + uprv_free(pBiDi->isolatesMemory); + } + if(pBiDi->insertPoints.points!=NULL) { + uprv_free(pBiDi->insertPoints.points); + } + + uprv_free(pBiDi); + } +} + +/* set to approximate "inverse BiDi" ---------------------------------------- */ + +U_CAPI void U_EXPORT2 +ubidi_setInverse(UBiDi *pBiDi, UBool isInverse) { + if(pBiDi!=NULL) { + pBiDi->isInverse=isInverse; + pBiDi->reorderingMode = isInverse ? UBIDI_REORDER_INVERSE_NUMBERS_AS_L + : UBIDI_REORDER_DEFAULT; + } +} + +U_CAPI UBool U_EXPORT2 +ubidi_isInverse(UBiDi *pBiDi) { + if(pBiDi!=NULL) { + return pBiDi->isInverse; + } else { + return FALSE; + } +} + +/* FOOD FOR THOUGHT: currently the reordering modes are a mixture of + * algorithm for direct BiDi, algorithm for inverse BiDi and the bizarre + * concept of RUNS_ONLY which is a double operation. + * It could be advantageous to divide this into 3 concepts: + * a) Operation: direct / inverse / RUNS_ONLY + * b) Direct algorithm: default / NUMBERS_SPECIAL / GROUP_NUMBERS_WITH_R + * c) Inverse algorithm: default / INVERSE_LIKE_DIRECT / NUMBERS_SPECIAL + * This would allow combinations not possible today like RUNS_ONLY with + * NUMBERS_SPECIAL. + * Also allow to set INSERT_MARKS for the direct step of RUNS_ONLY and + * REMOVE_CONTROLS for the inverse step. + * Not all combinations would be supported, and probably not all do make sense. + * This would need to document which ones are supported and what are the + * fallbacks for unsupported combinations. + */ +U_CAPI void U_EXPORT2 +ubidi_setReorderingMode(UBiDi *pBiDi, UBiDiReorderingMode reorderingMode) { + if ((pBiDi!=NULL) && (reorderingMode >= UBIDI_REORDER_DEFAULT) + && (reorderingMode < UBIDI_REORDER_COUNT)) { + pBiDi->reorderingMode = reorderingMode; + pBiDi->isInverse = (UBool)(reorderingMode == UBIDI_REORDER_INVERSE_NUMBERS_AS_L); + } +} + +U_CAPI UBiDiReorderingMode U_EXPORT2 +ubidi_getReorderingMode(UBiDi *pBiDi) { + if (pBiDi!=NULL) { + return pBiDi->reorderingMode; + } else { + return UBIDI_REORDER_DEFAULT; + } +} + +U_CAPI void U_EXPORT2 +ubidi_setReorderingOptions(UBiDi *pBiDi, uint32_t reorderingOptions) { + if (reorderingOptions & UBIDI_OPTION_REMOVE_CONTROLS) { + reorderingOptions&=~UBIDI_OPTION_INSERT_MARKS; + } + if (pBiDi!=NULL) { + pBiDi->reorderingOptions=reorderingOptions; + } +} + +U_CAPI uint32_t U_EXPORT2 +ubidi_getReorderingOptions(UBiDi *pBiDi) { + if (pBiDi!=NULL) { + return pBiDi->reorderingOptions; + } else { + return 0; + } +} + +U_CAPI UBiDiDirection U_EXPORT2 +ubidi_getBaseDirection(const UChar *text, +int32_t length){ + + int32_t i; + UChar32 uchar; + UCharDirection dir; + + if( text==NULL || length<-1 ){ + return UBIDI_NEUTRAL; + } + + if(length==-1) { + length=u_strlen(text); + } + + for( i = 0 ; i < length; ) { + /* i is incremented by U16_NEXT */ + U16_NEXT(text, i, length, uchar); + dir = u_charDirection(uchar); + if( dir == U_LEFT_TO_RIGHT ) + return UBIDI_LTR; + if( dir == U_RIGHT_TO_LEFT || dir ==U_RIGHT_TO_LEFT_ARABIC ) + return UBIDI_RTL; + } + return UBIDI_NEUTRAL; +} + +/* perform (P2)..(P3) ------------------------------------------------------- */ + +/** + * Returns the directionality of the first strong character + * after the last B in prologue, if any. + * Requires prologue!=null. + */ +static DirProp +firstL_R_AL(UBiDi *pBiDi) { + const UChar *text=pBiDi->prologue; + int32_t length=pBiDi->proLength; + int32_t i; + UChar32 uchar; + DirProp dirProp, result=ON; + for(i=0; i<length; ) { + /* i is incremented by U16_NEXT */ + U16_NEXT(text, i, length, uchar); + dirProp=(DirProp)ubidi_getCustomizedClass(pBiDi, uchar); + if(result==ON) { + if(dirProp==L || dirProp==R || dirProp==AL) { + result=dirProp; + } + } else { + if(dirProp==B) { + result=ON; + } + } + } + return result; +} + +/* + * Check that there are enough entries in the array pointed to by pBiDi->paras + */ +static UBool +checkParaCount(UBiDi *pBiDi) { + int32_t count=pBiDi->paraCount; + if(pBiDi->paras==pBiDi->simpleParas) { + if(count<=SIMPLE_PARAS_COUNT) + return TRUE; + if(!getInitialParasMemory(pBiDi, SIMPLE_PARAS_COUNT * 2)) + return FALSE; + pBiDi->paras=pBiDi->parasMemory; + uprv_memcpy(pBiDi->parasMemory, pBiDi->simpleParas, SIMPLE_PARAS_COUNT * sizeof(Para)); + return TRUE; + } + if(!getInitialParasMemory(pBiDi, count * 2)) + return FALSE; + pBiDi->paras=pBiDi->parasMemory; + return TRUE; +} + +/* + * Get the directional properties for the text, calculate the flags bit-set, and + * determine the paragraph level if necessary (in pBiDi->paras[i].level). + * FSI initiators are also resolved and their dirProp replaced with LRI or RLI. + * When encountering an FSI, it is initially replaced with an LRI, which is the + * default. Only if a strong R or AL is found within its scope will the LRI be + * replaced by an RLI. + */ +static UBool +getDirProps(UBiDi *pBiDi) { + const UChar *text=pBiDi->text; + DirProp *dirProps=pBiDi->dirPropsMemory; /* pBiDi->dirProps is const */ + + int32_t i=0, originalLength=pBiDi->originalLength; + Flags flags=0; /* collect all directionalities in the text */ + UChar32 uchar; + DirProp dirProp=0, defaultParaLevel=0; /* initialize to avoid compiler warnings */ + UBool isDefaultLevel=IS_DEFAULT_LEVEL(pBiDi->paraLevel); + /* for inverse BiDi, the default para level is set to RTL if there is a + strong R or AL character at either end of the text */ + UBool isDefaultLevelInverse=isDefaultLevel && (UBool) + (pBiDi->reorderingMode==UBIDI_REORDER_INVERSE_LIKE_DIRECT || + pBiDi->reorderingMode==UBIDI_REORDER_INVERSE_FOR_NUMBERS_SPECIAL); + int32_t lastArabicPos=-1; + int32_t controlCount=0; + UBool removeBiDiControls = (UBool)(pBiDi->reorderingOptions & + UBIDI_OPTION_REMOVE_CONTROLS); + + typedef enum { + NOT_SEEKING_STRONG, /* 0: not contextual paraLevel, not after FSI */ + SEEKING_STRONG_FOR_PARA, /* 1: looking for first strong char in para */ + SEEKING_STRONG_FOR_FSI, /* 2: looking for first strong after FSI */ + LOOKING_FOR_PDI /* 3: found strong after FSI, looking for PDI */ + } State; + State state; + DirProp lastStrong=ON; /* for default level & inverse BiDi */ + /* The following stacks are used to manage isolate sequences. Those + sequences may be nested, but obviously never more deeply than the + maximum explicit embedding level. + lastStack is the index of the last used entry in the stack. A value of -1 + means that there is no open isolate sequence. + lastStack is reset to -1 on paragraph boundaries. */ + /* The following stack contains the position of the initiator of + each open isolate sequence */ + int32_t isolateStartStack[UBIDI_MAX_EXPLICIT_LEVEL+1]; + /* The following stack contains the last known state before + encountering the initiator of an isolate sequence */ + int8_t previousStateStack[UBIDI_MAX_EXPLICIT_LEVEL+1]; + int32_t stackLast=-1; + + if(pBiDi->reorderingOptions & UBIDI_OPTION_STREAMING) + pBiDi->length=0; + defaultParaLevel=pBiDi->paraLevel&1; + if(isDefaultLevel) { + pBiDi->paras[0].level=defaultParaLevel; + lastStrong=defaultParaLevel; + if(pBiDi->proLength>0 && /* there is a prologue */ + (dirProp=firstL_R_AL(pBiDi))!=ON) { /* with a strong character */ + if(dirProp==L) + pBiDi->paras[0].level=0; /* set the default para level */ + else + pBiDi->paras[0].level=1; /* set the default para level */ + state=NOT_SEEKING_STRONG; + } else { + state=SEEKING_STRONG_FOR_PARA; + } + } else { + pBiDi->paras[0].level=pBiDi->paraLevel; + state=NOT_SEEKING_STRONG; + } + /* count paragraphs and determine the paragraph level (P2..P3) */ + /* + * see comment in ubidi.h: + * the UBIDI_DEFAULT_XXX values are designed so that + * their bit 0 alone yields the intended default + */ + for( /* i=0 above */ ; i<originalLength; ) { + /* i is incremented by U16_NEXT */ + U16_NEXT(text, i, originalLength, uchar); + flags|=DIRPROP_FLAG(dirProp=(DirProp)ubidi_getCustomizedClass(pBiDi, uchar)); + dirProps[i-1]=dirProp; + if(uchar>0xffff) { /* set the lead surrogate's property to BN */ + flags|=DIRPROP_FLAG(BN); + dirProps[i-2]=BN; + } + if(removeBiDiControls && IS_BIDI_CONTROL_CHAR(uchar)) + controlCount++; + if(dirProp==L) { + if(state==SEEKING_STRONG_FOR_PARA) { + pBiDi->paras[pBiDi->paraCount-1].level=0; + state=NOT_SEEKING_STRONG; + } + else if(state==SEEKING_STRONG_FOR_FSI) { + if(stackLast<=UBIDI_MAX_EXPLICIT_LEVEL) { + /* no need for next statement, already set by default */ + /* dirProps[isolateStartStack[stackLast]]=LRI; */ + flags|=DIRPROP_FLAG(LRI); + } + state=LOOKING_FOR_PDI; + } + lastStrong=L; + continue; + } + if(dirProp==R || dirProp==AL) { + if(state==SEEKING_STRONG_FOR_PARA) { + pBiDi->paras[pBiDi->paraCount-1].level=1; + state=NOT_SEEKING_STRONG; + } + else if(state==SEEKING_STRONG_FOR_FSI) { + if(stackLast<=UBIDI_MAX_EXPLICIT_LEVEL) { + dirProps[isolateStartStack[stackLast]]=RLI; + flags|=DIRPROP_FLAG(RLI); + } + state=LOOKING_FOR_PDI; + } + lastStrong=R; + if(dirProp==AL) + lastArabicPos=i-1; + continue; + } + if(dirProp>=FSI && dirProp<=RLI) { /* FSI, LRI or RLI */ + stackLast++; + if(stackLast<=UBIDI_MAX_EXPLICIT_LEVEL) { + isolateStartStack[stackLast]=i-1; + previousStateStack[stackLast]=state; + } + if(dirProp==FSI) { + dirProps[i-1]=LRI; /* default if no strong char */ + state=SEEKING_STRONG_FOR_FSI; + } + else + state=LOOKING_FOR_PDI; + continue; + } + if(dirProp==PDI) { + if(state==SEEKING_STRONG_FOR_FSI) { + if(stackLast<=UBIDI_MAX_EXPLICIT_LEVEL) { + /* no need for next statement, already set by default */ + /* dirProps[isolateStartStack[stackLast]]=LRI; */ + flags|=DIRPROP_FLAG(LRI); + } + } + if(stackLast>=0) { + if(stackLast<=UBIDI_MAX_EXPLICIT_LEVEL) + state=previousStateStack[stackLast]; + stackLast--; + } + continue; + } + if(dirProp==B) { + if(i<originalLength && uchar==CR && text[i]==LF) /* do nothing on the CR */ + continue; + pBiDi->paras[pBiDi->paraCount-1].limit=i; + if(isDefaultLevelInverse && lastStrong==R) + pBiDi->paras[pBiDi->paraCount-1].level=1; + if(pBiDi->reorderingOptions & UBIDI_OPTION_STREAMING) { + /* When streaming, we only process whole paragraphs + thus some updates are only done on paragraph boundaries */ + pBiDi->length=i; /* i is index to next character */ + pBiDi->controlCount=controlCount; + } + if(i<originalLength) { /* B not last char in text */ + pBiDi->paraCount++; + if(checkParaCount(pBiDi)==FALSE) /* not enough memory for a new para entry */ + return FALSE; + if(isDefaultLevel) { + pBiDi->paras[pBiDi->paraCount-1].level=defaultParaLevel; + state=SEEKING_STRONG_FOR_PARA; + lastStrong=defaultParaLevel; + } else { + pBiDi->paras[pBiDi->paraCount-1].level=pBiDi->paraLevel; + state=NOT_SEEKING_STRONG; + } + stackLast=-1; + } + continue; + } + } + /* Ignore still open isolate sequences with overflow */ + if(stackLast>UBIDI_MAX_EXPLICIT_LEVEL) { + stackLast=UBIDI_MAX_EXPLICIT_LEVEL; + state=SEEKING_STRONG_FOR_FSI; /* to be on the safe side */ + } + /* Resolve direction of still unresolved open FSI sequences */ + while(stackLast>=0) { + if(state==SEEKING_STRONG_FOR_FSI) { + /* no need for next statement, already set by default */ + /* dirProps[isolateStartStack[stackLast]]=LRI; */ + flags|=DIRPROP_FLAG(LRI); + break; + } + state=previousStateStack[stackLast]; + stackLast--; + } + /* When streaming, ignore text after the last paragraph separator */ + if(pBiDi->reorderingOptions & UBIDI_OPTION_STREAMING) { + if(pBiDi->length<originalLength) + pBiDi->paraCount--; + } else { + pBiDi->paras[pBiDi->paraCount-1].limit=originalLength; + pBiDi->controlCount=controlCount; + } + /* For inverse bidi, default para direction is RTL if there is + a strong R or AL at either end of the paragraph */ + if(isDefaultLevelInverse && lastStrong==R) { + pBiDi->paras[pBiDi->paraCount-1].level=1; + } + if(isDefaultLevel) { + pBiDi->paraLevel=pBiDi->paras[0].level; + } + /* The following is needed to resolve the text direction for default level + paragraphs containing no strong character */ + for(i=0; i<pBiDi->paraCount; i++) + flags|=DIRPROP_FLAG_LR(pBiDi->paras[i].level); + + if(pBiDi->orderParagraphsLTR && (flags&DIRPROP_FLAG(B))) { + flags|=DIRPROP_FLAG(L); + } + pBiDi->flags=flags; + pBiDi->lastArabicPos=lastArabicPos; + return TRUE; +} + +/* determine the paragraph level at position index */ +U_CFUNC UBiDiLevel +ubidi_getParaLevelAtIndex(const UBiDi *pBiDi, int32_t pindex) { + int32_t i; + for(i=0; i<pBiDi->paraCount; i++) + if(pindex<pBiDi->paras[i].limit) + break; + if(i>=pBiDi->paraCount) + i=pBiDi->paraCount-1; + return (UBiDiLevel)(pBiDi->paras[i].level); +} + +/* Functions for handling paired brackets ----------------------------------- */ + +/* In the isoRuns array, the first entry is used for text outside of any + isolate sequence. Higher entries are used for each more deeply nested + isolate sequence. isoRunLast is the index of the last used entry. The + openings array is used to note the data of opening brackets not yet + matched by a closing bracket, or matched but still susceptible to change + level. + Each isoRun entry contains the index of the first and + one-after-last openings entries for pending opening brackets it + contains. The next openings entry to use is the one-after-last of the + most deeply nested isoRun entry. + isoRun entries also contain their current embedding level and the last + encountered strong character, since these will be needed to resolve + the level of paired brackets. */ + +static void +bracketInit(UBiDi *pBiDi, BracketData *bd) { + bd->pBiDi=pBiDi; + bd->isoRunLast=0; + bd->isoRuns[0].start=0; + bd->isoRuns[0].limit=0; + bd->isoRuns[0].level=GET_PARALEVEL(pBiDi, 0); + bd->isoRuns[0].lastStrong=bd->isoRuns[0].lastBase=bd->isoRuns[0].contextDir=GET_PARALEVEL(pBiDi, 0)&1; + bd->isoRuns[0].contextPos=0; + if(pBiDi->openingsMemory) { + bd->openings=pBiDi->openingsMemory; + bd->openingsCount=pBiDi->openingsSize / sizeof(Opening); + } else { + bd->openings=bd->simpleOpenings; + bd->openingsCount=SIMPLE_OPENINGS_COUNT; + } + bd->isNumbersSpecial=bd->pBiDi->reorderingMode==UBIDI_REORDER_NUMBERS_SPECIAL || + bd->pBiDi->reorderingMode==UBIDI_REORDER_INVERSE_FOR_NUMBERS_SPECIAL; +} + +/* paragraph boundary */ +static void +bracketProcessB(BracketData *bd, UBiDiLevel level) { + bd->isoRunLast=0; + bd->isoRuns[0].limit=0; + bd->isoRuns[0].level=level; + bd->isoRuns[0].lastStrong=bd->isoRuns[0].lastBase=bd->isoRuns[0].contextDir=level&1; + bd->isoRuns[0].contextPos=0; +} + +/* LRE, LRO, RLE, RLO, PDF */ +static void +bracketProcessBoundary(BracketData *bd, int32_t lastCcPos, + UBiDiLevel contextLevel, UBiDiLevel embeddingLevel) { + IsoRun *pLastIsoRun=&bd->isoRuns[bd->isoRunLast]; + DirProp *dirProps=bd->pBiDi->dirProps; + if(DIRPROP_FLAG(dirProps[lastCcPos])&MASK_ISO) /* after an isolate */ + return; + if(NO_OVERRIDE(embeddingLevel)>NO_OVERRIDE(contextLevel)) /* not a PDF */ + contextLevel=embeddingLevel; + pLastIsoRun->limit=pLastIsoRun->start; + pLastIsoRun->level=embeddingLevel; + pLastIsoRun->lastStrong=pLastIsoRun->lastBase=pLastIsoRun->contextDir=contextLevel&1; + pLastIsoRun->contextPos=lastCcPos; +} + +/* LRI or RLI */ +static void +bracketProcessLRI_RLI(BracketData *bd, UBiDiLevel level) { + IsoRun *pLastIsoRun=&bd->isoRuns[bd->isoRunLast]; + int16_t lastLimit; + pLastIsoRun->lastBase=ON; + lastLimit=pLastIsoRun->limit; + bd->isoRunLast++; + pLastIsoRun++; + pLastIsoRun->start=pLastIsoRun->limit=lastLimit; + pLastIsoRun->level=level; + pLastIsoRun->lastStrong=pLastIsoRun->lastBase=pLastIsoRun->contextDir=level&1; + pLastIsoRun->contextPos=0; +} + +/* PDI */ +static void +bracketProcessPDI(BracketData *bd) { + IsoRun *pLastIsoRun; + bd->isoRunLast--; + pLastIsoRun=&bd->isoRuns[bd->isoRunLast]; + pLastIsoRun->lastBase=ON; +} + +/* newly found opening bracket: create an openings entry */ +static UBool /* return TRUE if success */ +bracketAddOpening(BracketData *bd, UChar match, int32_t position) { + IsoRun *pLastIsoRun=&bd->isoRuns[bd->isoRunLast]; + Opening *pOpening; + if(pLastIsoRun->limit>=bd->openingsCount) { /* no available new entry */ + UBiDi *pBiDi=bd->pBiDi; + if(!getInitialOpeningsMemory(pBiDi, pLastIsoRun->limit * 2)) + return FALSE; + if(bd->openings==bd->simpleOpenings) + uprv_memcpy(pBiDi->openingsMemory, bd->simpleOpenings, + SIMPLE_OPENINGS_COUNT * sizeof(Opening)); + bd->openings=pBiDi->openingsMemory; /* may have changed */ + bd->openingsCount=pBiDi->openingsSize / sizeof(Opening); + } + pOpening=&bd->openings[pLastIsoRun->limit]; + pOpening->position=position; + pOpening->match=match; + pOpening->contextDir=pLastIsoRun->contextDir; + pOpening->contextPos=pLastIsoRun->contextPos; + pOpening->flags=0; + pLastIsoRun->limit++; + return TRUE; +} + +/* change N0c1 to N0c2 when a preceding bracket is assigned the embedding level */ +static void +fixN0c(BracketData *bd, int32_t openingIndex, int32_t newPropPosition, DirProp newProp) { + /* This function calls itself recursively */ + IsoRun *pLastIsoRun=&bd->isoRuns[bd->isoRunLast]; + Opening *qOpening; + DirProp *dirProps=bd->pBiDi->dirProps; + int32_t k, openingPosition, closingPosition; + for(k=openingIndex+1, qOpening=&bd->openings[k]; k<pLastIsoRun->limit; k++, qOpening++) { + if(qOpening->match>=0) /* not an N0c match */ + continue; + if(newPropPosition<qOpening->contextPos) + break; + if(newPropPosition>=qOpening->position) + continue; + if(newProp==qOpening->contextDir) + break; + openingPosition=qOpening->position; + dirProps[openingPosition]=newProp; + closingPosition=-(qOpening->match); + dirProps[closingPosition]=newProp; + qOpening->match=0; /* prevent further changes */ + fixN0c(bd, k, openingPosition, newProp); + fixN0c(bd, k, closingPosition, newProp); + } +} + +/* process closing bracket */ +static DirProp /* return L or R if N0b or N0c, ON if N0d */ +bracketProcessClosing(BracketData *bd, int32_t openIdx, int32_t position) { + IsoRun *pLastIsoRun=&bd->isoRuns[bd->isoRunLast]; + Opening *pOpening, *qOpening; + UBiDiDirection direction; + UBool stable; + DirProp newProp; + pOpening=&bd->openings[openIdx]; + direction=pLastIsoRun->level&1; + stable=TRUE; /* assume stable until proved otherwise */ + + /* The stable flag is set when brackets are paired and their + level is resolved and cannot be changed by what will be + found later in the source string. + An unstable match can occur only when applying N0c, where + the resolved level depends on the preceding context, and + this context may be affected by text occurring later. + Example: RTL paragraph containing: abc[(latin) HEBREW] + When the closing parenthesis is encountered, it appears + that N0c1 must be applied since 'abc' sets an opposite + direction context and both parentheses receive level 2. + However, when the closing square bracket is processed, + N0b applies because of 'HEBREW' being included within the + brackets, thus the square brackets are treated like R and + receive level 1. However, this changes the preceding + context of the opening parenthesis, and it now appears + that N0c2 must be applied to the parentheses rather than + N0c1. */ + + if((direction==0 && pOpening->flags&FOUND_L) || + (direction==1 && pOpening->flags&FOUND_R)) { /* N0b */ + newProp=direction; + } + else if(pOpening->flags&(FOUND_L|FOUND_R)) { /* N0c */ + /* it is stable if there is no containing pair or in + conditions too complicated and not worth checking */ + stable=(openIdx==pLastIsoRun->start); + if(direction!=pOpening->contextDir) + newProp=pOpening->contextDir; /* N0c1 */ + else + newProp=direction; /* N0c2 */ + } else { + /* forget this and any brackets nested within this pair */ + pLastIsoRun->limit=openIdx; + return ON; /* N0d */ + } + bd->pBiDi->dirProps[pOpening->position]=newProp; + bd->pBiDi->dirProps[position]=newProp; + /* Update nested N0c pairs that may be affected */ + fixN0c(bd, openIdx, pOpening->position, newProp); + if(stable) { + pLastIsoRun->limit=openIdx; /* forget any brackets nested within this pair */ + /* remove lower located synonyms if any */ + while(pLastIsoRun->limit>pLastIsoRun->start && + bd->openings[pLastIsoRun->limit-1].position==pOpening->position) + pLastIsoRun->limit--; + } else { + int32_t k; + pOpening->match=-position; + /* neutralize lower located synonyms if any */ + k=openIdx-1; + while(k>=pLastIsoRun->start && + bd->openings[k].position==pOpening->position) + bd->openings[k--].match=0; + /* neutralize any unmatched opening between the current pair; + this will also neutralize higher located synonyms if any */ + for(k=openIdx+1; k<pLastIsoRun->limit; k++) { + qOpening=&bd->openings[k]; + if(qOpening->position>=position) + break; + if(qOpening->match>0) + qOpening->match=0; + } + } + return newProp; +} + +/* handle strong characters, digits and candidates for closing brackets */ +static UBool /* return TRUE if success */ +bracketProcessChar(BracketData *bd, int32_t position) { + IsoRun *pLastIsoRun=&bd->isoRuns[bd->isoRunLast]; + DirProp *dirProps, dirProp, newProp; + UBiDiLevel level; + dirProps=bd->pBiDi->dirProps; + dirProp=dirProps[position]; + if(dirProp==ON) { + UChar c, match; + int32_t idx; + /* First see if it is a matching closing bracket. Hopefully, this is + more efficient than checking if it is a closing bracket at all */ + c=bd->pBiDi->text[position]; + for(idx=pLastIsoRun->limit-1; idx>=pLastIsoRun->start; idx--) { + if(bd->openings[idx].match!=c) + continue; + /* We have a match */ + newProp=bracketProcessClosing(bd, idx, position); + if(newProp==ON) { /* N0d */ + c=0; /* prevent handling as an opening */ + break; + } + pLastIsoRun->lastBase=ON; + pLastIsoRun->contextDir=newProp; + pLastIsoRun->contextPos=position; + level=bd->pBiDi->levels[position]; + if(level&UBIDI_LEVEL_OVERRIDE) { /* X4, X5 */ + uint16_t flag; + int32_t i; + newProp=level&1; + pLastIsoRun->lastStrong=newProp; + flag=DIRPROP_FLAG(newProp); + for(i=pLastIsoRun->start; i<idx; i++) + bd->openings[i].flags|=flag; + /* matching brackets are not overridden by LRO/RLO */ + bd->pBiDi->levels[position]&=~UBIDI_LEVEL_OVERRIDE; + } + /* matching brackets are not overridden by LRO/RLO */ + bd->pBiDi->levels[bd->openings[idx].position]&=~UBIDI_LEVEL_OVERRIDE; + return TRUE; + } + /* We get here only if the ON character is not a matching closing + bracket or it is a case of N0d */ + /* Now see if it is an opening bracket */ + if(c) + match=u_getBidiPairedBracket(c); /* get the matching char */ + else + match=0; + if(match!=c && /* has a matching char */ + ubidi_getPairedBracketType(bd->pBiDi->bdp, c)==U_BPT_OPEN) { /* opening bracket */ + /* special case: process synonyms + create an opening entry for each synonym */ + if(match==0x232A) { /* RIGHT-POINTING ANGLE BRACKET */ + if(!bracketAddOpening(bd, 0x3009, position)) + return FALSE; + } + else if(match==0x3009) { /* RIGHT ANGLE BRACKET */ + if(!bracketAddOpening(bd, 0x232A, position)) + return FALSE; + } + if(!bracketAddOpening(bd, match, position)) + return FALSE; + } + } + level=bd->pBiDi->levels[position]; + if(level&UBIDI_LEVEL_OVERRIDE) { /* X4, X5 */ + newProp=level&1; + if(dirProp!=S && dirProp!=WS && dirProp!=ON) + dirProps[position]=newProp; + pLastIsoRun->lastBase=newProp; + pLastIsoRun->lastStrong=newProp; + pLastIsoRun->contextDir=newProp; + pLastIsoRun->contextPos=position; + } + else if(dirProp<=R || dirProp==AL) { + newProp=DIR_FROM_STRONG(dirProp); + pLastIsoRun->lastBase=dirProp; + pLastIsoRun->lastStrong=dirProp; + pLastIsoRun->contextDir=newProp; + pLastIsoRun->contextPos=position; + } + else if(dirProp==EN) { + pLastIsoRun->lastBase=EN; + if(pLastIsoRun->lastStrong==L) { + newProp=L; /* W7 */ + if(!bd->isNumbersSpecial) + dirProps[position]=ENL; + pLastIsoRun->contextDir=L; + pLastIsoRun->contextPos=position; + } + else { + newProp=R; /* N0 */ + if(pLastIsoRun->lastStrong==AL) + dirProps[position]=AN; /* W2 */ + else + dirProps[position]=ENR; + pLastIsoRun->contextDir=R; + pLastIsoRun->contextPos=position; + } + } + else if(dirProp==AN) { + newProp=R; /* N0 */ + pLastIsoRun->lastBase=AN; + pLastIsoRun->contextDir=R; + pLastIsoRun->contextPos=position; + } + else if(dirProp==NSM) { + /* if the last real char was ON, change NSM to ON so that it + will stay ON even if the last real char is a bracket which + may be changed to L or R */ + newProp=pLastIsoRun->lastBase; + if(newProp==ON) + dirProps[position]=newProp; + } + else { + newProp=dirProp; + pLastIsoRun->lastBase=dirProp; + } + if(newProp<=R || newProp==AL) { + int32_t i; + uint16_t flag=DIRPROP_FLAG(DIR_FROM_STRONG(newProp)); + for(i=pLastIsoRun->start; i<pLastIsoRun->limit; i++) + if(position>bd->openings[i].position) + bd->openings[i].flags|=flag; + } + return TRUE; +} + +/* perform (X1)..(X9) ------------------------------------------------------- */ + +/* determine if the text is mixed-directional or single-directional */ +static UBiDiDirection +directionFromFlags(UBiDi *pBiDi) { + Flags flags=pBiDi->flags; + /* if the text contains AN and neutrals, then some neutrals may become RTL */ + if(!(flags&MASK_RTL || ((flags&DIRPROP_FLAG(AN)) && (flags&MASK_POSSIBLE_N)))) { + return UBIDI_LTR; + } else if(!(flags&MASK_LTR)) { + return UBIDI_RTL; + } else { + return UBIDI_MIXED; + } +} + +/* + * Resolve the explicit levels as specified by explicit embedding codes. + * Recalculate the flags to have them reflect the real properties + * after taking the explicit embeddings into account. + * + * The BiDi algorithm is designed to result in the same behavior whether embedding + * levels are externally specified (from "styled text", supposedly the preferred + * method) or set by explicit embedding codes (LRx, RLx, PDF, FSI, PDI) in the plain text. + * That is why (X9) instructs to remove all not-isolate explicit codes (and BN). + * However, in a real implementation, the removal of these codes and their index + * positions in the plain text is undesirable since it would result in + * reallocated, reindexed text. + * Instead, this implementation leaves the codes in there and just ignores them + * in the subsequent processing. + * In order to get the same reordering behavior, positions with a BN or a not-isolate + * explicit embedding code just get the same level assigned as the last "real" + * character. + * + * Some implementations, not this one, then overwrite some of these + * directionality properties at "real" same-level-run boundaries by + * L or R codes so that the resolution of weak types can be performed on the + * entire paragraph at once instead of having to parse it once more and + * perform that resolution on same-level-runs. + * This limits the scope of the implicit rules in effectively + * the same way as the run limits. + * + * Instead, this implementation does not modify these codes, except for + * paired brackets whose properties (ON) may be replaced by L or R. + * On one hand, the paragraph has to be scanned for same-level-runs, but + * on the other hand, this saves another loop to reset these codes, + * or saves making and modifying a copy of dirProps[]. + * + * + * Note that (Pn) and (Xn) changed significantly from version 4 of the BiDi algorithm. + * + * + * Handling the stack of explicit levels (Xn): + * + * With the BiDi stack of explicit levels, as pushed with each + * LRE, RLE, LRO, RLO, LRI, RLI and FSI and popped with each PDF and PDI, + * the explicit level must never exceed UBIDI_MAX_EXPLICIT_LEVEL. + * + * In order to have a correct push-pop semantics even in the case of overflows, + * overflow counters and a valid isolate counter are used as described in UAX#9 + * section 3.3.2 "Explicit Levels and Directions". + * + * This implementation assumes that UBIDI_MAX_EXPLICIT_LEVEL is odd. + * + * Returns normally the direction; -1 if there was a memory shortage + * + */ +static UBiDiDirection +resolveExplicitLevels(UBiDi *pBiDi, UErrorCode *pErrorCode) { + DirProp *dirProps=pBiDi->dirProps; + UBiDiLevel *levels=pBiDi->levels; + const UChar *text=pBiDi->text; + + int32_t i=0, length=pBiDi->length; + Flags flags=pBiDi->flags; /* collect all directionalities in the text */ + DirProp dirProp; + UBiDiLevel level=GET_PARALEVEL(pBiDi, 0); + UBiDiDirection direction; + pBiDi->isolateCount=0; + + if(U_FAILURE(*pErrorCode)) { return UBIDI_LTR; } + + /* determine if the text is mixed-directional or single-directional */ + direction=directionFromFlags(pBiDi); + + /* we may not need to resolve any explicit levels */ + if((direction!=UBIDI_MIXED)) { + /* not mixed directionality: levels don't matter - trailingWSStart will be 0 */ + return direction; + } + if(pBiDi->reorderingMode > UBIDI_REORDER_LAST_LOGICAL_TO_VISUAL) { + /* inverse BiDi: mixed, but all characters are at the same embedding level */ + /* set all levels to the paragraph level */ + int32_t paraIndex, start, limit; + for(paraIndex=0; paraIndex<pBiDi->paraCount; paraIndex++) { + if(paraIndex==0) + start=0; + else + start=pBiDi->paras[paraIndex-1].limit; + limit=pBiDi->paras[paraIndex].limit; + level=pBiDi->paras[paraIndex].level; + for(i=start; i<limit; i++) + levels[i]=level; + } + return direction; /* no bracket matching for inverse BiDi */ + } + if(!(flags&(MASK_EXPLICIT|MASK_ISO))) { + /* no embeddings, set all levels to the paragraph level */ + /* we still have to perform bracket matching */ + int32_t paraIndex, start, limit; + BracketData bracketData; + bracketInit(pBiDi, &bracketData); + for(paraIndex=0; paraIndex<pBiDi->paraCount; paraIndex++) { + if(paraIndex==0) + start=0; + else + start=pBiDi->paras[paraIndex-1].limit; + limit=pBiDi->paras[paraIndex].limit; + level=pBiDi->paras[paraIndex].level; + for(i=start; i<limit; i++) { + levels[i]=level; + dirProp=dirProps[i]; + if(dirProp==BN) + continue; + if(dirProp==B) { + if((i+1)<length) { + if(text[i]==CR && text[i+1]==LF) + continue; /* skip CR when followed by LF */ + bracketProcessB(&bracketData, level); + } + continue; + } + if(!bracketProcessChar(&bracketData, i)) { + *pErrorCode=U_MEMORY_ALLOCATION_ERROR; + return UBIDI_LTR; + } + } + } + return direction; + } + { + /* continue to perform (Xn) */ + + /* (X1) level is set for all codes, embeddingLevel keeps track of the push/pop operations */ + /* both variables may carry the UBIDI_LEVEL_OVERRIDE flag to indicate the override status */ + UBiDiLevel embeddingLevel=level, newLevel; + UBiDiLevel previousLevel=level; /* previous level for regular (not CC) characters */ + int32_t lastCcPos=0; /* index of last effective LRx,RLx, PDx */ + + /* The following stack remembers the embedding level and the ISOLATE flag of level runs. + stackLast points to its current entry. */ + uint16_t stack[UBIDI_MAX_EXPLICIT_LEVEL+2]; /* we never push anything >=UBIDI_MAX_EXPLICIT_LEVEL + but we need one more entry as base */ + uint32_t stackLast=0; + int32_t overflowIsolateCount=0; + int32_t overflowEmbeddingCount=0; + int32_t validIsolateCount=0; + BracketData bracketData; + bracketInit(pBiDi, &bracketData); + stack[0]=level; /* initialize base entry to para level, no override, no isolate */ + + /* recalculate the flags */ + flags=0; + + for(i=0; i<length; ++i) { + dirProp=dirProps[i]; + switch(dirProp) { + case LRE: + case RLE: + case LRO: + case RLO: + /* (X2, X3, X4, X5) */ + flags|=DIRPROP_FLAG(BN); + levels[i]=previousLevel; + if (dirProp==LRE || dirProp==LRO) + /* least greater even level */ + newLevel=(UBiDiLevel)((embeddingLevel+2)&~(UBIDI_LEVEL_OVERRIDE|1)); + else + /* least greater odd level */ + newLevel=(UBiDiLevel)((NO_OVERRIDE(embeddingLevel)+1)|1); + if(newLevel<=UBIDI_MAX_EXPLICIT_LEVEL && overflowIsolateCount==0 && + overflowEmbeddingCount==0) { + lastCcPos=i; + embeddingLevel=newLevel; + if(dirProp==LRO || dirProp==RLO) + embeddingLevel|=UBIDI_LEVEL_OVERRIDE; + stackLast++; + stack[stackLast]=embeddingLevel; + /* we don't need to set UBIDI_LEVEL_OVERRIDE off for LRE and RLE + since this has already been done for newLevel which is + the source for embeddingLevel. + */ + } else { + if(overflowIsolateCount==0) + overflowEmbeddingCount++; + } + break; + case PDF: + /* (X7) */ + flags|=DIRPROP_FLAG(BN); + levels[i]=previousLevel; + /* handle all the overflow cases first */ + if(overflowIsolateCount) { + break; + } + if(overflowEmbeddingCount) { + overflowEmbeddingCount--; + break; + } + if(stackLast>0 && stack[stackLast]<ISOLATE) { /* not an isolate entry */ + lastCcPos=i; + stackLast--; + embeddingLevel=(UBiDiLevel)stack[stackLast]; + } + break; + case LRI: + case RLI: + flags|=(DIRPROP_FLAG(ON)|DIRPROP_FLAG_LR(embeddingLevel)); + levels[i]=NO_OVERRIDE(embeddingLevel); + if(NO_OVERRIDE(embeddingLevel)!=NO_OVERRIDE(previousLevel)) { + bracketProcessBoundary(&bracketData, lastCcPos, + previousLevel, embeddingLevel); + flags|=DIRPROP_FLAG_MULTI_RUNS; + } + previousLevel=embeddingLevel; + /* (X5a, X5b) */ + if(dirProp==LRI) + /* least greater even level */ + newLevel=(UBiDiLevel)((embeddingLevel+2)&~(UBIDI_LEVEL_OVERRIDE|1)); + else + /* least greater odd level */ + newLevel=(UBiDiLevel)((NO_OVERRIDE(embeddingLevel)+1)|1); + if(newLevel<=UBIDI_MAX_EXPLICIT_LEVEL && overflowIsolateCount==0 && + overflowEmbeddingCount==0) { + flags|=DIRPROP_FLAG(dirProp); + lastCcPos=i; + validIsolateCount++; + if(validIsolateCount>pBiDi->isolateCount) + pBiDi->isolateCount=validIsolateCount; + embeddingLevel=newLevel; + /* we can increment stackLast without checking because newLevel + will exceed UBIDI_MAX_EXPLICIT_LEVEL before stackLast overflows */ + stackLast++; + stack[stackLast]=embeddingLevel+ISOLATE; + bracketProcessLRI_RLI(&bracketData, embeddingLevel); + } else { + /* make it WS so that it is handled by adjustWSLevels() */ + dirProps[i]=WS; + overflowIsolateCount++; + } + break; + case PDI: + if(NO_OVERRIDE(embeddingLevel)!=NO_OVERRIDE(previousLevel)) { + bracketProcessBoundary(&bracketData, lastCcPos, + previousLevel, embeddingLevel); + flags|=DIRPROP_FLAG_MULTI_RUNS; + } + /* (X6a) */ + if(overflowIsolateCount) { + overflowIsolateCount--; + /* make it WS so that it is handled by adjustWSLevels() */ + dirProps[i]=WS; + } + else if(validIsolateCount) { + flags|=DIRPROP_FLAG(PDI); + lastCcPos=i; + overflowEmbeddingCount=0; + while(stack[stackLast]<ISOLATE) /* pop embedding entries */ + stackLast--; /* until the last isolate entry */ + stackLast--; /* pop also the last isolate entry */ + validIsolateCount--; + bracketProcessPDI(&bracketData); + } else + /* make it WS so that it is handled by adjustWSLevels() */ + dirProps[i]=WS; + embeddingLevel=(UBiDiLevel)stack[stackLast]&~ISOLATE; + flags|=(DIRPROP_FLAG(ON)|DIRPROP_FLAG_LR(embeddingLevel)); + previousLevel=embeddingLevel; + levels[i]=NO_OVERRIDE(embeddingLevel); + break; + case B: + flags|=DIRPROP_FLAG(B); + levels[i]=GET_PARALEVEL(pBiDi, i); + if((i+1)<length) { + if(text[i]==CR && text[i+1]==LF) + break; /* skip CR when followed by LF */ + overflowEmbeddingCount=overflowIsolateCount=0; + validIsolateCount=0; + stackLast=0; + previousLevel=embeddingLevel=GET_PARALEVEL(pBiDi, i+1); + stack[0]=embeddingLevel; /* initialize base entry to para level, no override, no isolate */ + bracketProcessB(&bracketData, embeddingLevel); + } + break; + case BN: + /* BN, LRE, RLE, and PDF are supposed to be removed (X9) */ + /* they will get their levels set correctly in adjustWSLevels() */ + levels[i]=previousLevel; + flags|=DIRPROP_FLAG(BN); + break; + default: + /* all other types are normal characters and get the "real" level */ + if(NO_OVERRIDE(embeddingLevel)!=NO_OVERRIDE(previousLevel)) { + bracketProcessBoundary(&bracketData, lastCcPos, + previousLevel, embeddingLevel); + flags|=DIRPROP_FLAG_MULTI_RUNS; + if(embeddingLevel&UBIDI_LEVEL_OVERRIDE) + flags|=DIRPROP_FLAG_O(embeddingLevel); + else + flags|=DIRPROP_FLAG_E(embeddingLevel); + } + previousLevel=embeddingLevel; + levels[i]=embeddingLevel; + if(!bracketProcessChar(&bracketData, i)) + return -1; + /* the dirProp may have been changed in bracketProcessChar() */ + flags|=DIRPROP_FLAG(dirProps[i]); + break; + } + } + if(flags&MASK_EMBEDDING) + flags|=DIRPROP_FLAG_LR(pBiDi->paraLevel); + if(pBiDi->orderParagraphsLTR && (flags&DIRPROP_FLAG(B))) + flags|=DIRPROP_FLAG(L); + /* again, determine if the text is mixed-directional or single-directional */ + pBiDi->flags=flags; + direction=directionFromFlags(pBiDi); + } + return direction; +} + +/* + * Use a pre-specified embedding levels array: + * + * Adjust the directional properties for overrides (->LEVEL_OVERRIDE), + * ignore all explicit codes (X9), + * and check all the preset levels. + * + * Recalculate the flags to have them reflect the real properties + * after taking the explicit embeddings into account. + */ +static UBiDiDirection +checkExplicitLevels(UBiDi *pBiDi, UErrorCode *pErrorCode) { + DirProp *dirProps=pBiDi->dirProps; + DirProp dirProp; + UBiDiLevel *levels=pBiDi->levels; + int32_t isolateCount=0; + + int32_t i, length=pBiDi->length; + Flags flags=0; /* collect all directionalities in the text */ + UBiDiLevel level; + pBiDi->isolateCount=0; + + for(i=0; i<length; ++i) { + level=levels[i]; + dirProp=dirProps[i]; + if(dirProp==LRI || dirProp==RLI) { + isolateCount++; + if(isolateCount>pBiDi->isolateCount) + pBiDi->isolateCount=isolateCount; + } + else if(dirProp==PDI) + isolateCount--; + else if(dirProp==B) + isolateCount=0; + if(level&UBIDI_LEVEL_OVERRIDE) { + /* keep the override flag in levels[i] but adjust the flags */ + level&=~UBIDI_LEVEL_OVERRIDE; /* make the range check below simpler */ + flags|=DIRPROP_FLAG_O(level); + } else { + /* set the flags */ + flags|=DIRPROP_FLAG_E(level)|DIRPROP_FLAG(dirProp); + } + if((level<GET_PARALEVEL(pBiDi, i) && + !((0==level)&&(dirProp==B))) || + (UBIDI_MAX_EXPLICIT_LEVEL<level)) { + /* level out of bounds */ + *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR; + return UBIDI_LTR; + } + } + if(flags&MASK_EMBEDDING) + flags|=DIRPROP_FLAG_LR(pBiDi->paraLevel); + /* determine if the text is mixed-directional or single-directional */ + pBiDi->flags=flags; + return directionFromFlags(pBiDi); +} + +/****************************************************************** + The Properties state machine table +******************************************************************* + + All table cells are 8 bits: + bits 0..4: next state + bits 5..7: action to perform (if > 0) + + Cells may be of format "n" where n represents the next state + (except for the rightmost column). + Cells may also be of format "s(x,y)" where x represents an action + to perform and y represents the next state. + +******************************************************************* + Definitions and type for properties state table +******************************************************************* +*/ +#define IMPTABPROPS_COLUMNS 16 +#define IMPTABPROPS_RES (IMPTABPROPS_COLUMNS - 1) +#define GET_STATEPROPS(cell) ((cell)&0x1f) +#define GET_ACTIONPROPS(cell) ((cell)>>5) +#define s(action, newState) ((uint8_t)(newState+(action<<5))) + +static const uint8_t groupProp[] = /* dirProp regrouped */ +{ +/* L R EN ES ET AN CS B S WS ON LRE LRO AL RLE RLO PDF NSM BN FSI LRI RLI PDI ENL ENR */ + 0, 1, 2, 7, 8, 3, 9, 6, 5, 4, 4, 10, 10, 12, 10, 10, 10, 11, 10, 4, 4, 4, 4, 13, 14 +}; +enum { DirProp_L=0, DirProp_R=1, DirProp_EN=2, DirProp_AN=3, DirProp_ON=4, DirProp_S=5, DirProp_B=6 }; /* reduced dirProp */ + +/****************************************************************** + + PROPERTIES STATE TABLE + + In table impTabProps, + - the ON column regroups ON and WS, FSI, RLI, LRI and PDI + - the BN column regroups BN, LRE, RLE, LRO, RLO, PDF + - the Res column is the reduced property assigned to a run + + Action 1: process current run1, init new run1 + 2: init new run2 + 3: process run1, process run2, init new run1 + 4: process run1, set run1=run2, init new run2 + + Notes: + 1) This table is used in resolveImplicitLevels(). + 2) This table triggers actions when there is a change in the Bidi + property of incoming characters (action 1). + 3) Most such property sequences are processed immediately (in + fact, passed to processPropertySeq(). + 4) However, numbers are assembled as one sequence. This means + that undefined situations (like CS following digits, until + it is known if the next char will be a digit) are held until + following chars define them. + Example: digits followed by CS, then comes another CS or ON; + the digits will be processed, then the CS assigned + as the start of an ON sequence (action 3). + 5) There are cases where more than one sequence must be + processed, for instance digits followed by CS followed by L: + the digits must be processed as one sequence, and the CS + must be processed as an ON sequence, all this before starting + assembling chars for the opening L sequence. + + +*/ +static const uint8_t impTabProps[][IMPTABPROPS_COLUMNS] = +{ +/* L , R , EN , AN , ON , S , B , ES , ET , CS , BN , NSM , AL , ENL , ENR , Res */ +/* 0 Init */ { 1 , 2 , 4 , 5 , 7 , 15 , 17 , 7 , 9 , 7 , 0 , 7 , 3 , 18 , 21 , DirProp_ON }, +/* 1 L */ { 1 , s(1,2), s(1,4), s(1,5), s(1,7),s(1,15),s(1,17), s(1,7), s(1,9), s(1,7), 1 , 1 , s(1,3),s(1,18),s(1,21), DirProp_L }, +/* 2 R */ { s(1,1), 2 , s(1,4), s(1,5), s(1,7),s(1,15),s(1,17), s(1,7), s(1,9), s(1,7), 2 , 2 , s(1,3),s(1,18),s(1,21), DirProp_R }, +/* 3 AL */ { s(1,1), s(1,2), s(1,6), s(1,6), s(1,8),s(1,16),s(1,17), s(1,8), s(1,8), s(1,8), 3 , 3 , 3 ,s(1,18),s(1,21), DirProp_R }, +/* 4 EN */ { s(1,1), s(1,2), 4 , s(1,5), s(1,7),s(1,15),s(1,17),s(2,10), 11 ,s(2,10), 4 , 4 , s(1,3), 18 , 21 , DirProp_EN }, +/* 5 AN */ { s(1,1), s(1,2), s(1,4), 5 , s(1,7),s(1,15),s(1,17), s(1,7), s(1,9),s(2,12), 5 , 5 , s(1,3),s(1,18),s(1,21), DirProp_AN }, +/* 6 AL:EN/AN */ { s(1,1), s(1,2), 6 , 6 , s(1,8),s(1,16),s(1,17), s(1,8), s(1,8),s(2,13), 6 , 6 , s(1,3), 18 , 21 , DirProp_AN }, +/* 7 ON */ { s(1,1), s(1,2), s(1,4), s(1,5), 7 ,s(1,15),s(1,17), 7 ,s(2,14), 7 , 7 , 7 , s(1,3),s(1,18),s(1,21), DirProp_ON }, +/* 8 AL:ON */ { s(1,1), s(1,2), s(1,6), s(1,6), 8 ,s(1,16),s(1,17), 8 , 8 , 8 , 8 , 8 , s(1,3),s(1,18),s(1,21), DirProp_ON }, +/* 9 ET */ { s(1,1), s(1,2), 4 , s(1,5), 7 ,s(1,15),s(1,17), 7 , 9 , 7 , 9 , 9 , s(1,3), 18 , 21 , DirProp_ON }, +/*10 EN+ES/CS */ { s(3,1), s(3,2), 4 , s(3,5), s(4,7),s(3,15),s(3,17), s(4,7),s(4,14), s(4,7), 10 , s(4,7), s(3,3), 18 , 21 , DirProp_EN }, +/*11 EN+ET */ { s(1,1), s(1,2), 4 , s(1,5), s(1,7),s(1,15),s(1,17), s(1,7), 11 , s(1,7), 11 , 11 , s(1,3), 18 , 21 , DirProp_EN }, +/*12 AN+CS */ { s(3,1), s(3,2), s(3,4), 5 , s(4,7),s(3,15),s(3,17), s(4,7),s(4,14), s(4,7), 12 , s(4,7), s(3,3),s(3,18),s(3,21), DirProp_AN }, +/*13 AL:EN/AN+CS */ { s(3,1), s(3,2), 6 , 6 , s(4,8),s(3,16),s(3,17), s(4,8), s(4,8), s(4,8), 13 , s(4,8), s(3,3), 18 , 21 , DirProp_AN }, +/*14 ON+ET */ { s(1,1), s(1,2), s(4,4), s(1,5), 7 ,s(1,15),s(1,17), 7 , 14 , 7 , 14 , 14 , s(1,3),s(4,18),s(4,21), DirProp_ON }, +/*15 S */ { s(1,1), s(1,2), s(1,4), s(1,5), s(1,7), 15 ,s(1,17), s(1,7), s(1,9), s(1,7), 15 , s(1,7), s(1,3),s(1,18),s(1,21), DirProp_S }, +/*16 AL:S */ { s(1,1), s(1,2), s(1,6), s(1,6), s(1,8), 16 ,s(1,17), s(1,8), s(1,8), s(1,8), 16 , s(1,8), s(1,3),s(1,18),s(1,21), DirProp_S }, +/*17 B */ { s(1,1), s(1,2), s(1,4), s(1,5), s(1,7),s(1,15), 17 , s(1,7), s(1,9), s(1,7), 17 , s(1,7), s(1,3),s(1,18),s(1,21), DirProp_B }, +/*18 ENL */ { s(1,1), s(1,2), 18 , s(1,5), s(1,7),s(1,15),s(1,17),s(2,19), 20 ,s(2,19), 18 , 18 , s(1,3), 18 , 21 , DirProp_L }, +/*19 ENL+ES/CS */ { s(3,1), s(3,2), 18 , s(3,5), s(4,7),s(3,15),s(3,17), s(4,7),s(4,14), s(4,7), 19 , s(4,7), s(3,3), 18 , 21 , DirProp_L }, +/*20 ENL+ET */ { s(1,1), s(1,2), 18 , s(1,5), s(1,7),s(1,15),s(1,17), s(1,7), 20 , s(1,7), 20 , 20 , s(1,3), 18 , 21 , DirProp_L }, +/*21 ENR */ { s(1,1), s(1,2), 21 , s(1,5), s(1,7),s(1,15),s(1,17),s(2,22), 23 ,s(2,22), 21 , 21 , s(1,3), 18 , 21 , DirProp_AN }, +/*22 ENR+ES/CS */ { s(3,1), s(3,2), 21 , s(3,5), s(4,7),s(3,15),s(3,17), s(4,7),s(4,14), s(4,7), 22 , s(4,7), s(3,3), 18 , 21 , DirProp_AN }, +/*23 ENR+ET */ { s(1,1), s(1,2), 21 , s(1,5), s(1,7),s(1,15),s(1,17), s(1,7), 23 , s(1,7), 23 , 23 , s(1,3), 18 , 21 , DirProp_AN } +}; + +/* we must undef macro s because the levels tables have a different + * structure (4 bits for action and 4 bits for next state. + */ +#undef s + +/****************************************************************** + The levels state machine tables +******************************************************************* + + All table cells are 8 bits: + bits 0..3: next state + bits 4..7: action to perform (if > 0) + + Cells may be of format "n" where n represents the next state + (except for the rightmost column). + Cells may also be of format "s(x,y)" where x represents an action + to perform and y represents the next state. + + This format limits each table to 16 states each and to 15 actions. + +******************************************************************* + Definitions and type for levels state tables +******************************************************************* +*/ +#define IMPTABLEVELS_COLUMNS (DirProp_B + 2) +#define IMPTABLEVELS_RES (IMPTABLEVELS_COLUMNS - 1) +#define GET_STATE(cell) ((cell)&0x0f) +#define GET_ACTION(cell) ((cell)>>4) +#define s(action, newState) ((uint8_t)(newState+(action<<4))) + +typedef uint8_t ImpTab[][IMPTABLEVELS_COLUMNS]; +typedef uint8_t ImpAct[]; + +/* FOOD FOR THOUGHT: each ImpTab should have its associated ImpAct, + * instead of having a pair of ImpTab and a pair of ImpAct. + */ +typedef struct ImpTabPair { + const void * pImpTab[2]; + const void * pImpAct[2]; +} ImpTabPair; + +/****************************************************************** + + LEVELS STATE TABLES + + In all levels state tables, + - state 0 is the initial state + - the Res column is the increment to add to the text level + for this property sequence. + + The impAct arrays for each table of a pair map the local action + numbers of the table to the total list of actions. For instance, + action 2 in a given table corresponds to the action number which + appears in entry [2] of the impAct array for that table. + The first entry of all impAct arrays must be 0. + + Action 1: init conditional sequence + 2: prepend conditional sequence to current sequence + 3: set ON sequence to new level - 1 + 4: init EN/AN/ON sequence + 5: fix EN/AN/ON sequence followed by R + 6: set previous level sequence to level 2 + + Notes: + 1) These tables are used in processPropertySeq(). The input + is property sequences as determined by resolveImplicitLevels. + 2) Most such property sequences are processed immediately + (levels are assigned). + 3) However, some sequences cannot be assigned a final level till + one or more following sequences are received. For instance, + ON following an R sequence within an even-level paragraph. + If the following sequence is R, the ON sequence will be + assigned basic run level+1, and so will the R sequence. + 4) S is generally handled like ON, since its level will be fixed + to paragraph level in adjustWSLevels(). + +*/ + +static const ImpTab impTabL_DEFAULT = /* Even paragraph level */ +/* In this table, conditional sequences receive the lower possible level + until proven otherwise. +*/ +{ +/* L , R , EN , AN , ON , S , B , Res */ +/* 0 : init */ { 0 , 1 , 0 , 2 , 0 , 0 , 0 , 0 }, +/* 1 : R */ { 0 , 1 , 3 , 3 , s(1,4), s(1,4), 0 , 1 }, +/* 2 : AN */ { 0 , 1 , 0 , 2 , s(1,5), s(1,5), 0 , 2 }, +/* 3 : R+EN/AN */ { 0 , 1 , 3 , 3 , s(1,4), s(1,4), 0 , 2 }, +/* 4 : R+ON */ { 0 , s(2,1), s(3,3), s(3,3), 4 , 4 , 0 , 0 }, +/* 5 : AN+ON */ { 0 , s(2,1), 0 , s(3,2), 5 , 5 , 0 , 0 } +}; +static const ImpTab impTabR_DEFAULT = /* Odd paragraph level */ +/* In this table, conditional sequences receive the lower possible level + until proven otherwise. +*/ +{ +/* L , R , EN , AN , ON , S , B , Res */ +/* 0 : init */ { 1 , 0 , 2 , 2 , 0 , 0 , 0 , 0 }, +/* 1 : L */ { 1 , 0 , 1 , 3 , s(1,4), s(1,4), 0 , 1 }, +/* 2 : EN/AN */ { 1 , 0 , 2 , 2 , 0 , 0 , 0 , 1 }, +/* 3 : L+AN */ { 1 , 0 , 1 , 3 , 5 , 5 , 0 , 1 }, +/* 4 : L+ON */ { s(2,1), 0 , s(2,1), 3 , 4 , 4 , 0 , 0 }, +/* 5 : L+AN+ON */ { 1 , 0 , 1 , 3 , 5 , 5 , 0 , 0 } +}; +static const ImpAct impAct0 = {0,1,2,3,4}; +static const ImpTabPair impTab_DEFAULT = {{&impTabL_DEFAULT, + &impTabR_DEFAULT}, + {&impAct0, &impAct0}}; + +static const ImpTab impTabL_NUMBERS_SPECIAL = /* Even paragraph level */ +/* In this table, conditional sequences receive the lower possible level + until proven otherwise. +*/ +{ +/* L , R , EN , AN , ON , S , B , Res */ +/* 0 : init */ { 0 , 2 , s(1,1), s(1,1), 0 , 0 , 0 , 0 }, +/* 1 : L+EN/AN */ { 0 , s(4,2), 1 , 1 , 0 , 0 , 0 , 0 }, +/* 2 : R */ { 0 , 2 , 4 , 4 , s(1,3), s(1,3), 0 , 1 }, +/* 3 : R+ON */ { 0 , s(2,2), s(3,4), s(3,4), 3 , 3 , 0 , 0 }, +/* 4 : R+EN/AN */ { 0 , 2 , 4 , 4 , s(1,3), s(1,3), 0 , 2 } +}; +static const ImpTabPair impTab_NUMBERS_SPECIAL = {{&impTabL_NUMBERS_SPECIAL, + &impTabR_DEFAULT}, + {&impAct0, &impAct0}}; + +static const ImpTab impTabL_GROUP_NUMBERS_WITH_R = +/* In this table, EN/AN+ON sequences receive levels as if associated with R + until proven that there is L or sor/eor on both sides. AN is handled like EN. +*/ +{ +/* L , R , EN , AN , ON , S , B , Res */ +/* 0 init */ { 0 , 3 , s(1,1), s(1,1), 0 , 0 , 0 , 0 }, +/* 1 EN/AN */ { s(2,0), 3 , 1 , 1 , 2 , s(2,0), s(2,0), 2 }, +/* 2 EN/AN+ON */ { s(2,0), 3 , 1 , 1 , 2 , s(2,0), s(2,0), 1 }, +/* 3 R */ { 0 , 3 , 5 , 5 , s(1,4), 0 , 0 , 1 }, +/* 4 R+ON */ { s(2,0), 3 , 5 , 5 , 4 , s(2,0), s(2,0), 1 }, +/* 5 R+EN/AN */ { 0 , 3 , 5 , 5 , s(1,4), 0 , 0 , 2 } +}; +static const ImpTab impTabR_GROUP_NUMBERS_WITH_R = +/* In this table, EN/AN+ON sequences receive levels as if associated with R + until proven that there is L on both sides. AN is handled like EN. +*/ +{ +/* L , R , EN , AN , ON , S , B , Res */ +/* 0 init */ { 2 , 0 , 1 , 1 , 0 , 0 , 0 , 0 }, +/* 1 EN/AN */ { 2 , 0 , 1 , 1 , 0 , 0 , 0 , 1 }, +/* 2 L */ { 2 , 0 , s(1,4), s(1,4), s(1,3), 0 , 0 , 1 }, +/* 3 L+ON */ { s(2,2), 0 , 4 , 4 , 3 , 0 , 0 , 0 }, +/* 4 L+EN/AN */ { s(2,2), 0 , 4 , 4 , 3 , 0 , 0 , 1 } +}; +static const ImpTabPair impTab_GROUP_NUMBERS_WITH_R = { + {&impTabL_GROUP_NUMBERS_WITH_R, + &impTabR_GROUP_NUMBERS_WITH_R}, + {&impAct0, &impAct0}}; + + +static const ImpTab impTabL_INVERSE_NUMBERS_AS_L = +/* This table is identical to the Default LTR table except that EN and AN are + handled like L. +*/ +{ +/* L , R , EN , AN , ON , S , B , Res */ +/* 0 : init */ { 0 , 1 , 0 , 0 , 0 , 0 , 0 , 0 }, +/* 1 : R */ { 0 , 1 , 0 , 0 , s(1,4), s(1,4), 0 , 1 }, +/* 2 : AN */ { 0 , 1 , 0 , 0 , s(1,5), s(1,5), 0 , 2 }, +/* 3 : R+EN/AN */ { 0 , 1 , 0 , 0 , s(1,4), s(1,4), 0 , 2 }, +/* 4 : R+ON */ { s(2,0), 1 , s(2,0), s(2,0), 4 , 4 , s(2,0), 1 }, +/* 5 : AN+ON */ { s(2,0), 1 , s(2,0), s(2,0), 5 , 5 , s(2,0), 1 } +}; +static const ImpTab impTabR_INVERSE_NUMBERS_AS_L = +/* This table is identical to the Default RTL table except that EN and AN are + handled like L. +*/ +{ +/* L , R , EN , AN , ON , S , B , Res */ +/* 0 : init */ { 1 , 0 , 1 , 1 , 0 , 0 , 0 , 0 }, +/* 1 : L */ { 1 , 0 , 1 , 1 , s(1,4), s(1,4), 0 , 1 }, +/* 2 : EN/AN */ { 1 , 0 , 1 , 1 , 0 , 0 , 0 , 1 }, +/* 3 : L+AN */ { 1 , 0 , 1 , 1 , 5 , 5 , 0 , 1 }, +/* 4 : L+ON */ { s(2,1), 0 , s(2,1), s(2,1), 4 , 4 , 0 , 0 }, +/* 5 : L+AN+ON */ { 1 , 0 , 1 , 1 , 5 , 5 , 0 , 0 } +}; +static const ImpTabPair impTab_INVERSE_NUMBERS_AS_L = { + {&impTabL_INVERSE_NUMBERS_AS_L, + &impTabR_INVERSE_NUMBERS_AS_L}, + {&impAct0, &impAct0}}; + +static const ImpTab impTabR_INVERSE_LIKE_DIRECT = /* Odd paragraph level */ +/* In this table, conditional sequences receive the lower possible level + until proven otherwise. +*/ +{ +/* L , R , EN , AN , ON , S , B , Res */ +/* 0 : init */ { 1 , 0 , 2 , 2 , 0 , 0 , 0 , 0 }, +/* 1 : L */ { 1 , 0 , 1 , 2 , s(1,3), s(1,3), 0 , 1 }, +/* 2 : EN/AN */ { 1 , 0 , 2 , 2 , 0 , 0 , 0 , 1 }, +/* 3 : L+ON */ { s(2,1), s(3,0), 6 , 4 , 3 , 3 , s(3,0), 0 }, +/* 4 : L+ON+AN */ { s(2,1), s(3,0), 6 , 4 , 5 , 5 , s(3,0), 3 }, +/* 5 : L+AN+ON */ { s(2,1), s(3,0), 6 , 4 , 5 , 5 , s(3,0), 2 }, +/* 6 : L+ON+EN */ { s(2,1), s(3,0), 6 , 4 , 3 , 3 , s(3,0), 1 } +}; +static const ImpAct impAct1 = {0,1,13,14}; +/* FOOD FOR THOUGHT: in LTR table below, check case "JKL 123abc" + */ +static const ImpTabPair impTab_INVERSE_LIKE_DIRECT = { + {&impTabL_DEFAULT, + &impTabR_INVERSE_LIKE_DIRECT}, + {&impAct0, &impAct1}}; + +static const ImpTab impTabL_INVERSE_LIKE_DIRECT_WITH_MARKS = +/* The case handled in this table is (visually): R EN L +*/ +{ +/* L , R , EN , AN , ON , S , B , Res */ +/* 0 : init */ { 0 , s(6,3), 0 , 1 , 0 , 0 , 0 , 0 }, +/* 1 : L+AN */ { 0 , s(6,3), 0 , 1 , s(1,2), s(3,0), 0 , 4 }, +/* 2 : L+AN+ON */ { s(2,0), s(6,3), s(2,0), 1 , 2 , s(3,0), s(2,0), 3 }, +/* 3 : R */ { 0 , s(6,3), s(5,5), s(5,6), s(1,4), s(3,0), 0 , 3 }, +/* 4 : R+ON */ { s(3,0), s(4,3), s(5,5), s(5,6), 4 , s(3,0), s(3,0), 3 }, +/* 5 : R+EN */ { s(3,0), s(4,3), 5 , s(5,6), s(1,4), s(3,0), s(3,0), 4 }, +/* 6 : R+AN */ { s(3,0), s(4,3), s(5,5), 6 , s(1,4), s(3,0), s(3,0), 4 } +}; +static const ImpTab impTabR_INVERSE_LIKE_DIRECT_WITH_MARKS = +/* The cases handled in this table are (visually): R EN L + R L AN L +*/ +{ +/* L , R , EN , AN , ON , S , B , Res */ +/* 0 : init */ { s(1,3), 0 , 1 , 1 , 0 , 0 , 0 , 0 }, +/* 1 : R+EN/AN */ { s(2,3), 0 , 1 , 1 , 2 , s(4,0), 0 , 1 }, +/* 2 : R+EN/AN+ON */ { s(2,3), 0 , 1 , 1 , 2 , s(4,0), 0 , 0 }, +/* 3 : L */ { 3 , 0 , 3 , s(3,6), s(1,4), s(4,0), 0 , 1 }, +/* 4 : L+ON */ { s(5,3), s(4,0), 5 , s(3,6), 4 , s(4,0), s(4,0), 0 }, +/* 5 : L+ON+EN */ { s(5,3), s(4,0), 5 , s(3,6), 4 , s(4,0), s(4,0), 1 }, +/* 6 : L+AN */ { s(5,3), s(4,0), 6 , 6 , 4 , s(4,0), s(4,0), 3 } +}; +static const ImpAct impAct2 = {0,1,2,5,6,7,8}; +static const ImpAct impAct3 = {0,1,9,10,11,12}; +static const ImpTabPair impTab_INVERSE_LIKE_DIRECT_WITH_MARKS = { + {&impTabL_INVERSE_LIKE_DIRECT_WITH_MARKS, + &impTabR_INVERSE_LIKE_DIRECT_WITH_MARKS}, + {&impAct2, &impAct3}}; + +static const ImpTabPair impTab_INVERSE_FOR_NUMBERS_SPECIAL = { + {&impTabL_NUMBERS_SPECIAL, + &impTabR_INVERSE_LIKE_DIRECT}, + {&impAct0, &impAct1}}; + +static const ImpTab impTabL_INVERSE_FOR_NUMBERS_SPECIAL_WITH_MARKS = +/* The case handled in this table is (visually): R EN L +*/ +{ +/* L , R , EN , AN , ON , S , B , Res */ +/* 0 : init */ { 0 , s(6,2), 1 , 1 , 0 , 0 , 0 , 0 }, +/* 1 : L+EN/AN */ { 0 , s(6,2), 1 , 1 , 0 , s(3,0), 0 , 4 }, +/* 2 : R */ { 0 , s(6,2), s(5,4), s(5,4), s(1,3), s(3,0), 0 , 3 }, +/* 3 : R+ON */ { s(3,0), s(4,2), s(5,4), s(5,4), 3 , s(3,0), s(3,0), 3 }, +/* 4 : R+EN/AN */ { s(3,0), s(4,2), 4 , 4 , s(1,3), s(3,0), s(3,0), 4 } +}; +static const ImpTabPair impTab_INVERSE_FOR_NUMBERS_SPECIAL_WITH_MARKS = { + {&impTabL_INVERSE_FOR_NUMBERS_SPECIAL_WITH_MARKS, + &impTabR_INVERSE_LIKE_DIRECT_WITH_MARKS}, + {&impAct2, &impAct3}}; + +#undef s + +typedef struct { + const ImpTab * pImpTab; /* level table pointer */ + const ImpAct * pImpAct; /* action map array */ + int32_t startON; /* start of ON sequence */ + int32_t startL2EN; /* start of level 2 sequence */ + int32_t lastStrongRTL; /* index of last found R or AL */ + int32_t state; /* current state */ + int32_t runStart; /* start position of the run */ + UBiDiLevel runLevel; /* run level before implicit solving */ +} LevState; + +/*------------------------------------------------------------------------*/ + +static void +addPoint(UBiDi *pBiDi, int32_t pos, int32_t flag) + /* param pos: position where to insert + param flag: one of LRM_BEFORE, LRM_AFTER, RLM_BEFORE, RLM_AFTER + */ +{ +#define FIRSTALLOC 10 + Point point; + InsertPoints * pInsertPoints=&(pBiDi->insertPoints); + + if (pInsertPoints->capacity == 0) + { + pInsertPoints->points=uprv_malloc(sizeof(Point)*FIRSTALLOC); + if (pInsertPoints->points == NULL) + { + pInsertPoints->errorCode=U_MEMORY_ALLOCATION_ERROR; + return; + } + pInsertPoints->capacity=FIRSTALLOC; + } + if (pInsertPoints->size >= pInsertPoints->capacity) /* no room for new point */ + { + void * savePoints=pInsertPoints->points; + pInsertPoints->points=uprv_realloc(pInsertPoints->points, + pInsertPoints->capacity*2*sizeof(Point)); + if (pInsertPoints->points == NULL) + { + pInsertPoints->points=savePoints; + pInsertPoints->errorCode=U_MEMORY_ALLOCATION_ERROR; + return; + } + else pInsertPoints->capacity*=2; + } + point.pos=pos; + point.flag=flag; + pInsertPoints->points[pInsertPoints->size]=point; + pInsertPoints->size++; +#undef FIRSTALLOC +} + +static void +setLevelsOutsideIsolates(UBiDi *pBiDi, int32_t start, int32_t limit, UBiDiLevel level) +{ + DirProp *dirProps=pBiDi->dirProps, dirProp; + UBiDiLevel *levels=pBiDi->levels; + int32_t isolateCount=0, k; + for(k=start; k<limit; k++) { + dirProp=dirProps[k]; + if(dirProp==PDI) + isolateCount--; + if(isolateCount==0) + levels[k]=level; + if(dirProp==LRI || dirProp==RLI) + isolateCount++; + } +} + +/* perform rules (Wn), (Nn), and (In) on a run of the text ------------------ */ + +/* + * This implementation of the (Wn) rules applies all rules in one pass. + * In order to do so, it needs a look-ahead of typically 1 character + * (except for W5: sequences of ET) and keeps track of changes + * in a rule Wp that affect a later Wq (p<q). + * + * The (Nn) and (In) rules are also performed in that same single loop, + * but effectively one iteration behind for white space. + * + * Since all implicit rules are performed in one step, it is not necessary + * to actually store the intermediate directional properties in dirProps[]. + */ + +static void +processPropertySeq(UBiDi *pBiDi, LevState *pLevState, uint8_t _prop, + int32_t start, int32_t limit) { + uint8_t cell, oldStateSeq, actionSeq; + const ImpTab * pImpTab=pLevState->pImpTab; + const ImpAct * pImpAct=pLevState->pImpAct; + UBiDiLevel * levels=pBiDi->levels; + UBiDiLevel level, addLevel; + InsertPoints * pInsertPoints; + int32_t start0, k; + + start0=start; /* save original start position */ + oldStateSeq=(uint8_t)pLevState->state; + cell=(*pImpTab)[oldStateSeq][_prop]; + pLevState->state=GET_STATE(cell); /* isolate the new state */ + actionSeq=(*pImpAct)[GET_ACTION(cell)]; /* isolate the action */ + addLevel=(*pImpTab)[pLevState->state][IMPTABLEVELS_RES]; + + if(actionSeq) { + switch(actionSeq) { + case 1: /* init ON seq */ + pLevState->startON=start0; + break; + + case 2: /* prepend ON seq to current seq */ + start=pLevState->startON; + break; + + case 3: /* EN/AN after R+ON */ + level=pLevState->runLevel+1; + setLevelsOutsideIsolates(pBiDi, pLevState->startON, start0, level); + break; + + case 4: /* EN/AN before R for NUMBERS_SPECIAL */ + level=pLevState->runLevel+2; + setLevelsOutsideIsolates(pBiDi, pLevState->startON, start0, level); + break; + + case 5: /* L or S after possible relevant EN/AN */ + /* check if we had EN after R/AL */ + if (pLevState->startL2EN >= 0) { + addPoint(pBiDi, pLevState->startL2EN, LRM_BEFORE); + } + pLevState->startL2EN=-1; /* not within previous if since could also be -2 */ + /* check if we had any relevant EN/AN after R/AL */ + pInsertPoints=&(pBiDi->insertPoints); + if ((pInsertPoints->capacity == 0) || + (pInsertPoints->size <= pInsertPoints->confirmed)) + { + /* nothing, just clean up */ + pLevState->lastStrongRTL=-1; + /* check if we have a pending conditional segment */ + level=(*pImpTab)[oldStateSeq][IMPTABLEVELS_RES]; + if ((level & 1) && (pLevState->startON > 0)) { /* after ON */ + start=pLevState->startON; /* reset to basic run level */ + } + if (_prop == DirProp_S) /* add LRM before S */ + { + addPoint(pBiDi, start0, LRM_BEFORE); + pInsertPoints->confirmed=pInsertPoints->size; + } + break; + } + /* reset previous RTL cont to level for LTR text */ + for (k=pLevState->lastStrongRTL+1; k<start0; k++) + { + /* reset odd level, leave runLevel+2 as is */ + levels[k]=(levels[k] - 2) & ~1; + } + /* mark insert points as confirmed */ + pInsertPoints->confirmed=pInsertPoints->size; + pLevState->lastStrongRTL=-1; + if (_prop == DirProp_S) /* add LRM before S */ + { + addPoint(pBiDi, start0, LRM_BEFORE); + pInsertPoints->confirmed=pInsertPoints->size; + } + break; + + case 6: /* R/AL after possible relevant EN/AN */ + /* just clean up */ + pInsertPoints=&(pBiDi->insertPoints); + if (pInsertPoints->capacity > 0) + /* remove all non confirmed insert points */ + pInsertPoints->size=pInsertPoints->confirmed; + pLevState->startON=-1; + pLevState->startL2EN=-1; + pLevState->lastStrongRTL=limit - 1; + break; + + case 7: /* EN/AN after R/AL + possible cont */ + /* check for real AN */ + if ((_prop == DirProp_AN) && (pBiDi->dirProps[start0] == AN) && + (pBiDi->reorderingMode!=UBIDI_REORDER_INVERSE_FOR_NUMBERS_SPECIAL)) + { + /* real AN */ + if (pLevState->startL2EN == -1) /* if no relevant EN already found */ + { + /* just note the righmost digit as a strong RTL */ + pLevState->lastStrongRTL=limit - 1; + break; + } + if (pLevState->startL2EN >= 0) /* after EN, no AN */ + { + addPoint(pBiDi, pLevState->startL2EN, LRM_BEFORE); + pLevState->startL2EN=-2; + } + /* note AN */ + addPoint(pBiDi, start0, LRM_BEFORE); + break; + } + /* if first EN/AN after R/AL */ + if (pLevState->startL2EN == -1) { + pLevState->startL2EN=start0; + } + break; + + case 8: /* note location of latest R/AL */ + pLevState->lastStrongRTL=limit - 1; + pLevState->startON=-1; + break; + + case 9: /* L after R+ON/EN/AN */ + /* include possible adjacent number on the left */ + for (k=start0-1; k>=0 && !(levels[k]&1); k--); + if(k>=0) { + addPoint(pBiDi, k, RLM_BEFORE); /* add RLM before */ + pInsertPoints=&(pBiDi->insertPoints); + pInsertPoints->confirmed=pInsertPoints->size; /* confirm it */ + } + pLevState->startON=start0; + break; + + case 10: /* AN after L */ + /* AN numbers between L text on both sides may be trouble. */ + /* tentatively bracket with LRMs; will be confirmed if followed by L */ + addPoint(pBiDi, start0, LRM_BEFORE); /* add LRM before */ + addPoint(pBiDi, start0, LRM_AFTER); /* add LRM after */ + break; + + case 11: /* R after L+ON/EN/AN */ + /* false alert, infirm LRMs around previous AN */ + pInsertPoints=&(pBiDi->insertPoints); + pInsertPoints->size=pInsertPoints->confirmed; + if (_prop == DirProp_S) /* add RLM before S */ + { + addPoint(pBiDi, start0, RLM_BEFORE); + pInsertPoints->confirmed=pInsertPoints->size; + } + break; + + case 12: /* L after L+ON/AN */ + level=pLevState->runLevel + addLevel; + for(k=pLevState->startON; k<start0; k++) { + if (levels[k]<level) + levels[k]=level; + } + pInsertPoints=&(pBiDi->insertPoints); + pInsertPoints->confirmed=pInsertPoints->size; /* confirm inserts */ + pLevState->startON=start0; + break; + + case 13: /* L after L+ON+EN/AN/ON */ + level=pLevState->runLevel; + for(k=start0-1; k>=pLevState->startON; k--) { + if(levels[k]==level+3) { + while(levels[k]==level+3) { + levels[k--]-=2; + } + while(levels[k]==level) { + k--; + } + } + if(levels[k]==level+2) { + levels[k]=level; + continue; + } + levels[k]=level+1; + } + break; + + case 14: /* R after L+ON+EN/AN/ON */ + level=pLevState->runLevel+1; + for(k=start0-1; k>=pLevState->startON; k--) { + if(levels[k]>level) { + levels[k]-=2; + } + } + break; + + default: /* we should never get here */ + U_ASSERT(FALSE); + break; + } + } + if((addLevel) || (start < start0)) { + level=pLevState->runLevel + addLevel; + if(start>=pLevState->runStart) { + for(k=start; k<limit; k++) { + levels[k]=level; + } + } else { + setLevelsOutsideIsolates(pBiDi, start, limit, level); + } + } +} + +/** + * Returns the directionality of the last strong character at the end of the prologue, if any. + * Requires prologue!=null. + */ +static DirProp +lastL_R_AL(UBiDi *pBiDi) { + const UChar *text=pBiDi->prologue; + int32_t length=pBiDi->proLength; + int32_t i; + UChar32 uchar; + DirProp dirProp; + for(i=length; i>0; ) { + /* i is decremented by U16_PREV */ + U16_PREV(text, 0, i, uchar); + dirProp=(DirProp)ubidi_getCustomizedClass(pBiDi, uchar); + if(dirProp==L) { + return DirProp_L; + } + if(dirProp==R || dirProp==AL) { + return DirProp_R; + } + if(dirProp==B) { + return DirProp_ON; + } + } + return DirProp_ON; +} + +/** + * Returns the directionality of the first strong character, or digit, in the epilogue, if any. + * Requires epilogue!=null. + */ +static DirProp +firstL_R_AL_EN_AN(UBiDi *pBiDi) { + const UChar *text=pBiDi->epilogue; + int32_t length=pBiDi->epiLength; + int32_t i; + UChar32 uchar; + DirProp dirProp; + for(i=0; i<length; ) { + /* i is incremented by U16_NEXT */ + U16_NEXT(text, i, length, uchar); + dirProp=(DirProp)ubidi_getCustomizedClass(pBiDi, uchar); + if(dirProp==L) { + return DirProp_L; + } + if(dirProp==R || dirProp==AL) { + return DirProp_R; + } + if(dirProp==EN) { + return DirProp_EN; + } + if(dirProp==AN) { + return DirProp_AN; + } + } + return DirProp_ON; +} + +static void +resolveImplicitLevels(UBiDi *pBiDi, + int32_t start, int32_t limit, + DirProp sor, DirProp eor) { + const DirProp *dirProps=pBiDi->dirProps; + DirProp dirProp; + LevState levState; + int32_t i, start1, start2; + uint16_t oldStateImp, stateImp, actionImp; + uint8_t gprop, resProp, cell; + UBool inverseRTL; + DirProp nextStrongProp=R; + int32_t nextStrongPos=-1; + + /* check for RTL inverse BiDi mode */ + /* FOOD FOR THOUGHT: in case of RTL inverse BiDi, it would make sense to + * loop on the text characters from end to start. + * This would need a different properties state table (at least different + * actions) and different levels state tables (maybe very similar to the + * LTR corresponding ones. + */ + inverseRTL=(UBool) + ((start<pBiDi->lastArabicPos) && (GET_PARALEVEL(pBiDi, start) & 1) && + (pBiDi->reorderingMode==UBIDI_REORDER_INVERSE_LIKE_DIRECT || + pBiDi->reorderingMode==UBIDI_REORDER_INVERSE_FOR_NUMBERS_SPECIAL)); + + /* initialize for property and levels state tables */ + levState.startL2EN=-1; /* used for INVERSE_LIKE_DIRECT_WITH_MARKS */ + levState.lastStrongRTL=-1; /* used for INVERSE_LIKE_DIRECT_WITH_MARKS */ + levState.runStart=start; + levState.runLevel=pBiDi->levels[start]; + levState.pImpTab=(const ImpTab*)((pBiDi->pImpTabPair)->pImpTab)[levState.runLevel&1]; + levState.pImpAct=(const ImpAct*)((pBiDi->pImpTabPair)->pImpAct)[levState.runLevel&1]; + if(start==0 && pBiDi->proLength>0) { + DirProp lastStrong=lastL_R_AL(pBiDi); + if(lastStrong!=DirProp_ON) { + sor=lastStrong; + } + } + /* The isolates[] entries contain enough information to + resume the bidi algorithm in the same state as it was + when it was interrupted by an isolate sequence. */ + if(dirProps[start]==PDI && pBiDi->isolateCount >= 0) { + levState.startON=pBiDi->isolates[pBiDi->isolateCount].startON; + start1=pBiDi->isolates[pBiDi->isolateCount].start1; + stateImp=pBiDi->isolates[pBiDi->isolateCount].stateImp; + levState.state=pBiDi->isolates[pBiDi->isolateCount].state; + pBiDi->isolateCount--; + } else { + levState.startON=-1; + start1=start; + if(dirProps[start]==NSM) + stateImp = 1 + sor; + else + stateImp=0; + levState.state=0; + processPropertySeq(pBiDi, &levState, sor, start, start); + } + start2=start; /* to make Java compiler happy */ + + for(i=start; i<=limit; i++) { + if(i>=limit) { + int32_t k; + for(k=limit-1; k>start&&(DIRPROP_FLAG(dirProps[k])&MASK_BN_EXPLICIT); k--); + dirProp=dirProps[k]; + if(dirProp==LRI || dirProp==RLI) + break; /* no forced closing for sequence ending with LRI/RLI */ + gprop=eor; + } else { + DirProp prop, prop1; + prop=dirProps[i]; + if(prop==B) { + pBiDi->isolateCount=-1; /* current isolates stack entry == none */ + } + if(inverseRTL) { + if(prop==AL) { + /* AL before EN does not make it AN */ + prop=R; + } else if(prop==EN) { + if(nextStrongPos<=i) { + /* look for next strong char (L/R/AL) */ + int32_t j; + nextStrongProp=R; /* set default */ + nextStrongPos=limit; + for(j=i+1; j<limit; j++) { + prop1=dirProps[j]; + if(prop1==L || prop1==R || prop1==AL) { + nextStrongProp=prop1; + nextStrongPos=j; + break; + } + } + } + if(nextStrongProp==AL) { + prop=AN; + } + } + } + gprop=groupProp[prop]; + } + oldStateImp=stateImp; + cell=impTabProps[oldStateImp][gprop]; + stateImp=GET_STATEPROPS(cell); /* isolate the new state */ + actionImp=GET_ACTIONPROPS(cell); /* isolate the action */ + if((i==limit) && (actionImp==0)) { + /* there is an unprocessed sequence if its property == eor */ + actionImp=1; /* process the last sequence */ + } + if(actionImp) { + resProp=impTabProps[oldStateImp][IMPTABPROPS_RES]; + switch(actionImp) { + case 1: /* process current seq1, init new seq1 */ + processPropertySeq(pBiDi, &levState, resProp, start1, i); + start1=i; + break; + case 2: /* init new seq2 */ + start2=i; + break; + case 3: /* process seq1, process seq2, init new seq1 */ + processPropertySeq(pBiDi, &levState, resProp, start1, start2); + processPropertySeq(pBiDi, &levState, DirProp_ON, start2, i); + start1=i; + break; + case 4: /* process seq1, set seq1=seq2, init new seq2 */ + processPropertySeq(pBiDi, &levState, resProp, start1, start2); + start1=start2; + start2=i; + break; + default: /* we should never get here */ + U_ASSERT(FALSE); + break; + } + } + } + + /* flush possible pending sequence, e.g. ON */ + if(limit==pBiDi->length && pBiDi->epiLength>0) { + DirProp firstStrong=firstL_R_AL_EN_AN(pBiDi); + if(firstStrong!=DirProp_ON) { + eor=firstStrong; + } + } + + /* look for the last char not a BN or LRE/RLE/LRO/RLO/PDF */ + for(i=limit-1; i>start&&(DIRPROP_FLAG(dirProps[i])&MASK_BN_EXPLICIT); i--); + dirProp=dirProps[i]; + if((dirProp==LRI || dirProp==RLI) && limit<pBiDi->length) { + pBiDi->isolateCount++; + pBiDi->isolates[pBiDi->isolateCount].stateImp=stateImp; + pBiDi->isolates[pBiDi->isolateCount].state=levState.state; + pBiDi->isolates[pBiDi->isolateCount].start1=start1; + pBiDi->isolates[pBiDi->isolateCount].startON=levState.startON; + } + else + processPropertySeq(pBiDi, &levState, eor, limit, limit); +} + +/* perform (L1) and (X9) ---------------------------------------------------- */ + +/* + * Reset the embedding levels for some non-graphic characters (L1). + * This function also sets appropriate levels for BN, and + * explicit embedding types that are supposed to have been removed + * from the paragraph in (X9). + */ +static void +adjustWSLevels(UBiDi *pBiDi) { + const DirProp *dirProps=pBiDi->dirProps; + UBiDiLevel *levels=pBiDi->levels; + int32_t i; + + if(pBiDi->flags&MASK_WS) { + UBool orderParagraphsLTR=pBiDi->orderParagraphsLTR; + Flags flag; + + i=pBiDi->trailingWSStart; + while(i>0) { + /* reset a sequence of WS/BN before eop and B/S to the paragraph paraLevel */ + while(i>0 && (flag=DIRPROP_FLAG(dirProps[--i]))&MASK_WS) { + if(orderParagraphsLTR&&(flag&DIRPROP_FLAG(B))) { + levels[i]=0; + } else { + levels[i]=GET_PARALEVEL(pBiDi, i); + } + } + + /* reset BN to the next character's paraLevel until B/S, which restarts above loop */ + /* here, i+1 is guaranteed to be <length */ + while(i>0) { + flag=DIRPROP_FLAG(dirProps[--i]); + if(flag&MASK_BN_EXPLICIT) { + levels[i]=levels[i+1]; + } else if(orderParagraphsLTR&&(flag&DIRPROP_FLAG(B))) { + levels[i]=0; + break; + } else if(flag&MASK_B_S) { + levels[i]=GET_PARALEVEL(pBiDi, i); + break; + } + } + } + } +} + +U_CAPI void U_EXPORT2 +ubidi_setContext(UBiDi *pBiDi, + const UChar *prologue, int32_t proLength, + const UChar *epilogue, int32_t epiLength, + UErrorCode *pErrorCode) { + /* check the argument values */ + RETURN_VOID_IF_NULL_OR_FAILING_ERRCODE(pErrorCode); + if(pBiDi==NULL || proLength<-1 || epiLength<-1 || + (prologue==NULL && proLength!=0) || (epilogue==NULL && epiLength!=0)) { + *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR; + return; + } + + if(proLength==-1) { + pBiDi->proLength=u_strlen(prologue); + } else { + pBiDi->proLength=proLength; + } + if(epiLength==-1) { + pBiDi->epiLength=u_strlen(epilogue); + } else { + pBiDi->epiLength=epiLength; + } + pBiDi->prologue=prologue; + pBiDi->epilogue=epilogue; +} + +static void +setParaSuccess(UBiDi *pBiDi) { + pBiDi->proLength=0; /* forget the last context */ + pBiDi->epiLength=0; + pBiDi->pParaBiDi=pBiDi; /* mark successful setPara */ +} + +#define BIDI_MIN(x, y) ((x)<(y) ? (x) : (y)) +#define BIDI_ABS(x) ((x)>=0 ? (x) : (-(x))) + +static void +setParaRunsOnly(UBiDi *pBiDi, const UChar *text, int32_t length, + UBiDiLevel paraLevel, UErrorCode *pErrorCode) { + void *runsOnlyMemory = NULL; + int32_t *visualMap; + UChar *visualText; + int32_t saveLength, saveTrailingWSStart; + const UBiDiLevel *levels; + UBiDiLevel *saveLevels; + UBiDiDirection saveDirection; + UBool saveMayAllocateText; + Run *runs; + int32_t visualLength, i, j, visualStart, logicalStart, + runCount, runLength, addedRuns, insertRemove, + start, limit, step, indexOddBit, logicalPos, + index0, index1; + uint32_t saveOptions; + + pBiDi->reorderingMode=UBIDI_REORDER_DEFAULT; + if(length==0) { + ubidi_setPara(pBiDi, text, length, paraLevel, NULL, pErrorCode); + goto cleanup3; + } + /* obtain memory for mapping table and visual text */ + runsOnlyMemory=uprv_malloc(length*(sizeof(int32_t)+sizeof(UChar)+sizeof(UBiDiLevel))); + if(runsOnlyMemory==NULL) { + *pErrorCode=U_MEMORY_ALLOCATION_ERROR; + goto cleanup3; + } + visualMap=runsOnlyMemory; + visualText=(UChar *)&visualMap[length]; + saveLevels=(UBiDiLevel *)&visualText[length]; + saveOptions=pBiDi->reorderingOptions; + if(saveOptions & UBIDI_OPTION_INSERT_MARKS) { + pBiDi->reorderingOptions&=~UBIDI_OPTION_INSERT_MARKS; + pBiDi->reorderingOptions|=UBIDI_OPTION_REMOVE_CONTROLS; + } + paraLevel&=1; /* accept only 0 or 1 */ + ubidi_setPara(pBiDi, text, length, paraLevel, NULL, pErrorCode); + if(U_FAILURE(*pErrorCode)) { + goto cleanup3; + } + /* we cannot access directly pBiDi->levels since it is not yet set if + * direction is not MIXED + */ + levels=ubidi_getLevels(pBiDi, pErrorCode); + uprv_memcpy(saveLevels, levels, (size_t)pBiDi->length*sizeof(UBiDiLevel)); + saveTrailingWSStart=pBiDi->trailingWSStart; + saveLength=pBiDi->length; + saveDirection=pBiDi->direction; + + /* FOOD FOR THOUGHT: instead of writing the visual text, we could use + * the visual map and the dirProps array to drive the second call + * to ubidi_setPara (but must make provision for possible removal of + * BiDi controls. Alternatively, only use the dirProps array via + * customized classifier callback. + */ + visualLength=ubidi_writeReordered(pBiDi, visualText, length, + UBIDI_DO_MIRRORING, pErrorCode); + ubidi_getVisualMap(pBiDi, visualMap, pErrorCode); + if(U_FAILURE(*pErrorCode)) { + goto cleanup2; + } + pBiDi->reorderingOptions=saveOptions; + + pBiDi->reorderingMode=UBIDI_REORDER_INVERSE_LIKE_DIRECT; + paraLevel^=1; + /* Because what we did with reorderingOptions, visualText may be shorter + * than the original text. But we don't want the levels memory to be + * reallocated shorter than the original length, since we need to restore + * the levels as after the first call to ubidi_setpara() before returning. + * We will force mayAllocateText to FALSE before the second call to + * ubidi_setpara(), and will restore it afterwards. + */ + saveMayAllocateText=pBiDi->mayAllocateText; + pBiDi->mayAllocateText=FALSE; + ubidi_setPara(pBiDi, visualText, visualLength, paraLevel, NULL, pErrorCode); + pBiDi->mayAllocateText=saveMayAllocateText; + ubidi_getRuns(pBiDi, pErrorCode); + if(U_FAILURE(*pErrorCode)) { + goto cleanup1; + } + /* check if some runs must be split, count how many splits */ + addedRuns=0; + runCount=pBiDi->runCount; + runs=pBiDi->runs; + visualStart=0; + for(i=0; i<runCount; i++, visualStart+=runLength) { + runLength=runs[i].visualLimit-visualStart; + if(runLength<2) { + continue; + } + logicalStart=GET_INDEX(runs[i].logicalStart); + for(j=logicalStart+1; j<logicalStart+runLength; j++) { + index0=visualMap[j]; + index1=visualMap[j-1]; + if((BIDI_ABS(index0-index1)!=1) || (saveLevels[index0]!=saveLevels[index1])) { + addedRuns++; + } + } + } + if(addedRuns) { + if(getRunsMemory(pBiDi, runCount+addedRuns)) { + if(runCount==1) { + /* because we switch from UBiDi.simpleRuns to UBiDi.runs */ + pBiDi->runsMemory[0]=runs[0]; + } + runs=pBiDi->runs=pBiDi->runsMemory; + pBiDi->runCount+=addedRuns; + } else { + goto cleanup1; + } + } + /* split runs which are not consecutive in source text */ + for(i=runCount-1; i>=0; i--) { + runLength= i==0 ? runs[0].visualLimit : + runs[i].visualLimit-runs[i-1].visualLimit; + logicalStart=runs[i].logicalStart; + indexOddBit=GET_ODD_BIT(logicalStart); + logicalStart=GET_INDEX(logicalStart); + if(runLength<2) { + if(addedRuns) { + runs[i+addedRuns]=runs[i]; + } + logicalPos=visualMap[logicalStart]; + runs[i+addedRuns].logicalStart=MAKE_INDEX_ODD_PAIR(logicalPos, + saveLevels[logicalPos]^indexOddBit); + continue; + } + if(indexOddBit) { + start=logicalStart; + limit=logicalStart+runLength-1; + step=1; + } else { + start=logicalStart+runLength-1; + limit=logicalStart; + step=-1; + } + for(j=start; j!=limit; j+=step) { + index0=visualMap[j]; + index1=visualMap[j+step]; + if((BIDI_ABS(index0-index1)!=1) || (saveLevels[index0]!=saveLevels[index1])) { + logicalPos=BIDI_MIN(visualMap[start], index0); + runs[i+addedRuns].logicalStart=MAKE_INDEX_ODD_PAIR(logicalPos, + saveLevels[logicalPos]^indexOddBit); + runs[i+addedRuns].visualLimit=runs[i].visualLimit; + runs[i].visualLimit-=BIDI_ABS(j-start)+1; + insertRemove=runs[i].insertRemove&(LRM_AFTER|RLM_AFTER); + runs[i+addedRuns].insertRemove=insertRemove; + runs[i].insertRemove&=~insertRemove; + start=j+step; + addedRuns--; + } + } + if(addedRuns) { + runs[i+addedRuns]=runs[i]; + } + logicalPos=BIDI_MIN(visualMap[start], visualMap[limit]); + runs[i+addedRuns].logicalStart=MAKE_INDEX_ODD_PAIR(logicalPos, + saveLevels[logicalPos]^indexOddBit); + } + + cleanup1: + /* restore initial paraLevel */ + pBiDi->paraLevel^=1; + cleanup2: + /* restore real text */ + pBiDi->text=text; + pBiDi->length=saveLength; + pBiDi->originalLength=length; + pBiDi->direction=saveDirection; + /* the saved levels should never excess levelsSize, but we check anyway */ + if(saveLength>pBiDi->levelsSize) { + saveLength=pBiDi->levelsSize; + } + uprv_memcpy(pBiDi->levels, saveLevels, (size_t)saveLength*sizeof(UBiDiLevel)); + pBiDi->trailingWSStart=saveTrailingWSStart; + if(pBiDi->runCount>1) { + pBiDi->direction=UBIDI_MIXED; + } + cleanup3: + /* free memory for mapping table and visual text */ + uprv_free(runsOnlyMemory); + + pBiDi->reorderingMode=UBIDI_REORDER_RUNS_ONLY; +} + +/* ubidi_setPara ------------------------------------------------------------ */ + +U_CAPI void U_EXPORT2 +ubidi_setPara(UBiDi *pBiDi, const UChar *text, int32_t length, + UBiDiLevel paraLevel, UBiDiLevel *embeddingLevels, + UErrorCode *pErrorCode) { + UBiDiDirection direction; + DirProp *dirProps; + + /* check the argument values */ + RETURN_VOID_IF_NULL_OR_FAILING_ERRCODE(pErrorCode); + if(pBiDi==NULL || text==NULL || length<-1 || + (paraLevel>UBIDI_MAX_EXPLICIT_LEVEL && paraLevel<UBIDI_DEFAULT_LTR)) { + *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR; + return; + } + + if(length==-1) { + length=u_strlen(text); + } + + /* special treatment for RUNS_ONLY mode */ + if(pBiDi->reorderingMode==UBIDI_REORDER_RUNS_ONLY) { + setParaRunsOnly(pBiDi, text, length, paraLevel, pErrorCode); + return; + } + + /* initialize the UBiDi structure */ + pBiDi->pParaBiDi=NULL; /* mark unfinished setPara */ + pBiDi->text=text; + pBiDi->length=pBiDi->originalLength=pBiDi->resultLength=length; + pBiDi->paraLevel=paraLevel; + pBiDi->direction=paraLevel&1; + pBiDi->paraCount=1; + + pBiDi->dirProps=NULL; + pBiDi->levels=NULL; + pBiDi->runs=NULL; + pBiDi->insertPoints.size=0; /* clean up from last call */ + pBiDi->insertPoints.confirmed=0; /* clean up from last call */ + + /* + * Save the original paraLevel if contextual; otherwise, set to 0. + */ + pBiDi->defaultParaLevel=IS_DEFAULT_LEVEL(paraLevel); + + if(length==0) { + /* + * For an empty paragraph, create a UBiDi object with the paraLevel and + * the flags and the direction set but without allocating zero-length arrays. + * There is nothing more to do. + */ + if(IS_DEFAULT_LEVEL(paraLevel)) { + pBiDi->paraLevel&=1; + pBiDi->defaultParaLevel=0; + } + pBiDi->flags=DIRPROP_FLAG_LR(paraLevel); + pBiDi->runCount=0; + pBiDi->paraCount=0; + setParaSuccess(pBiDi); /* mark successful setPara */ + return; + } + + pBiDi->runCount=-1; + + /* allocate paras memory */ + if(pBiDi->parasMemory) + pBiDi->paras=pBiDi->parasMemory; + else + pBiDi->paras=pBiDi->simpleParas; + + /* + * Get the directional properties, + * the flags bit-set, and + * determine the paragraph level if necessary. + */ + if(getDirPropsMemory(pBiDi, length)) { + pBiDi->dirProps=pBiDi->dirPropsMemory; + if(!getDirProps(pBiDi)) { + *pErrorCode=U_MEMORY_ALLOCATION_ERROR; + return; + } + } else { + *pErrorCode=U_MEMORY_ALLOCATION_ERROR; + return; + } + dirProps=pBiDi->dirProps; + /* the processed length may have changed if UBIDI_OPTION_STREAMING */ + length= pBiDi->length; + pBiDi->trailingWSStart=length; /* the levels[] will reflect the WS run */ + + /* are explicit levels specified? */ + if(embeddingLevels==NULL) { + /* no: determine explicit levels according to the (Xn) rules */\ + if(getLevelsMemory(pBiDi, length)) { + pBiDi->levels=pBiDi->levelsMemory; + direction=resolveExplicitLevels(pBiDi, pErrorCode); + if(U_FAILURE(*pErrorCode)) { + return; + } + } else { + *pErrorCode=U_MEMORY_ALLOCATION_ERROR; + return; + } + } else { + /* set BN for all explicit codes, check that all levels are 0 or paraLevel..UBIDI_MAX_EXPLICIT_LEVEL */ + pBiDi->levels=embeddingLevels; + direction=checkExplicitLevels(pBiDi, pErrorCode); + if(U_FAILURE(*pErrorCode)) { + return; + } + } + + /* allocate isolate memory */ + if(pBiDi->isolateCount<=SIMPLE_ISOLATES_COUNT) + pBiDi->isolates=pBiDi->simpleIsolates; + else + if((int32_t)(pBiDi->isolateCount*sizeof(Isolate))<=pBiDi->isolatesSize) + pBiDi->isolates=pBiDi->isolatesMemory; + else { + if(getInitialIsolatesMemory(pBiDi, pBiDi->isolateCount)) { + pBiDi->isolates=pBiDi->isolatesMemory; + } else { + *pErrorCode=U_MEMORY_ALLOCATION_ERROR; + return; + } + } + pBiDi->isolateCount=-1; /* current isolates stack entry == none */ + + /* + * The steps after (X9) in the UBiDi algorithm are performed only if + * the paragraph text has mixed directionality! + */ + pBiDi->direction=direction; + switch(direction) { + case UBIDI_LTR: + /* all levels are implicitly at paraLevel (important for ubidi_getLevels()) */ + pBiDi->trailingWSStart=0; + break; + case UBIDI_RTL: + /* all levels are implicitly at paraLevel (important for ubidi_getLevels()) */ + pBiDi->trailingWSStart=0; + break; + default: + /* + * Choose the right implicit state table + */ + switch(pBiDi->reorderingMode) { + case UBIDI_REORDER_DEFAULT: + pBiDi->pImpTabPair=&impTab_DEFAULT; + break; + case UBIDI_REORDER_NUMBERS_SPECIAL: + pBiDi->pImpTabPair=&impTab_NUMBERS_SPECIAL; + break; + case UBIDI_REORDER_GROUP_NUMBERS_WITH_R: + pBiDi->pImpTabPair=&impTab_GROUP_NUMBERS_WITH_R; + break; + case UBIDI_REORDER_INVERSE_NUMBERS_AS_L: + pBiDi->pImpTabPair=&impTab_INVERSE_NUMBERS_AS_L; + break; + case UBIDI_REORDER_INVERSE_LIKE_DIRECT: + if (pBiDi->reorderingOptions & UBIDI_OPTION_INSERT_MARKS) { + pBiDi->pImpTabPair=&impTab_INVERSE_LIKE_DIRECT_WITH_MARKS; + } else { + pBiDi->pImpTabPair=&impTab_INVERSE_LIKE_DIRECT; + } + break; + case UBIDI_REORDER_INVERSE_FOR_NUMBERS_SPECIAL: + if (pBiDi->reorderingOptions & UBIDI_OPTION_INSERT_MARKS) { + pBiDi->pImpTabPair=&impTab_INVERSE_FOR_NUMBERS_SPECIAL_WITH_MARKS; + } else { + pBiDi->pImpTabPair=&impTab_INVERSE_FOR_NUMBERS_SPECIAL; + } + break; + default: + /* we should never get here */ + U_ASSERT(FALSE); + break; + } + /* + * If there are no external levels specified and there + * are no significant explicit level codes in the text, + * then we can treat the entire paragraph as one run. + * Otherwise, we need to perform the following rules on runs of + * the text with the same embedding levels. (X10) + * "Significant" explicit level codes are ones that actually + * affect non-BN characters. + * Examples for "insignificant" ones are empty embeddings + * LRE-PDF, LRE-RLE-PDF-PDF, etc. + */ + if(embeddingLevels==NULL && pBiDi->paraCount<=1 && + !(pBiDi->flags&DIRPROP_FLAG_MULTI_RUNS)) { + resolveImplicitLevels(pBiDi, 0, length, + GET_LR_FROM_LEVEL(GET_PARALEVEL(pBiDi, 0)), + GET_LR_FROM_LEVEL(GET_PARALEVEL(pBiDi, length-1))); + } else { + /* sor, eor: start and end types of same-level-run */ + UBiDiLevel *levels=pBiDi->levels; + int32_t start, limit=0; + UBiDiLevel level, nextLevel; + DirProp sor, eor; + + /* determine the first sor and set eor to it because of the loop body (sor=eor there) */ + level=GET_PARALEVEL(pBiDi, 0); + nextLevel=levels[0]; + if(level<nextLevel) { + eor=GET_LR_FROM_LEVEL(nextLevel); + } else { + eor=GET_LR_FROM_LEVEL(level); + } + + do { + /* determine start and limit of the run (end points just behind the run) */ + + /* the values for this run's start are the same as for the previous run's end */ + start=limit; + level=nextLevel; + if((start>0) && (dirProps[start-1]==B)) { + /* except if this is a new paragraph, then set sor = para level */ + sor=GET_LR_FROM_LEVEL(GET_PARALEVEL(pBiDi, start)); + } else { + sor=eor; + } + + /* search for the limit of this run */ + while((++limit<length) && + ((levels[limit]==level) || + (DIRPROP_FLAG(dirProps[limit])&MASK_BN_EXPLICIT))) {} + + /* get the correct level of the next run */ + if(limit<length) { + nextLevel=levels[limit]; + } else { + nextLevel=GET_PARALEVEL(pBiDi, length-1); + } + + /* determine eor from max(level, nextLevel); sor is last run's eor */ + if(NO_OVERRIDE(level)<NO_OVERRIDE(nextLevel)) { + eor=GET_LR_FROM_LEVEL(nextLevel); + } else { + eor=GET_LR_FROM_LEVEL(level); + } + + /* if the run consists of overridden directional types, then there + are no implicit types to be resolved */ + if(!(level&UBIDI_LEVEL_OVERRIDE)) { + resolveImplicitLevels(pBiDi, start, limit, sor, eor); + } else { + /* remove the UBIDI_LEVEL_OVERRIDE flags */ + do { + levels[start++]&=~UBIDI_LEVEL_OVERRIDE; + } while(start<limit); + } + } while(limit<length); + } + /* check if we got any memory shortage while adding insert points */ + if (U_FAILURE(pBiDi->insertPoints.errorCode)) + { + *pErrorCode=pBiDi->insertPoints.errorCode; + return; + } + /* reset the embedding levels for some non-graphic characters (L1), (X9) */ + adjustWSLevels(pBiDi); + break; + } + /* add RLM for inverse Bidi with contextual orientation resolving + * to RTL which would not round-trip otherwise + */ + if((pBiDi->defaultParaLevel>0) && + (pBiDi->reorderingOptions & UBIDI_OPTION_INSERT_MARKS) && + ((pBiDi->reorderingMode==UBIDI_REORDER_INVERSE_LIKE_DIRECT) || + (pBiDi->reorderingMode==UBIDI_REORDER_INVERSE_FOR_NUMBERS_SPECIAL))) { + int32_t i, j, start, last; + UBiDiLevel level; + DirProp dirProp; + for(i=0; i<pBiDi->paraCount; i++) { + last=(pBiDi->paras[i].limit)-1; + level=pBiDi->paras[i].level; + if(level==0) + continue; /* LTR paragraph */ + start= i==0 ? 0 : pBiDi->paras[i-1].limit; + for(j=last; j>=start; j--) { + dirProp=dirProps[j]; + if(dirProp==L) { + if(j<last) { + while(dirProps[last]==B) { + last--; + } + } + addPoint(pBiDi, last, RLM_BEFORE); + break; + } + if(DIRPROP_FLAG(dirProp) & MASK_R_AL) { + break; + } + } + } + } + + if(pBiDi->reorderingOptions & UBIDI_OPTION_REMOVE_CONTROLS) { + pBiDi->resultLength -= pBiDi->controlCount; + } else { + pBiDi->resultLength += pBiDi->insertPoints.size; + } + setParaSuccess(pBiDi); /* mark successful setPara */ +} + +U_CAPI void U_EXPORT2 +ubidi_orderParagraphsLTR(UBiDi *pBiDi, UBool orderParagraphsLTR) { + if(pBiDi!=NULL) { + pBiDi->orderParagraphsLTR=orderParagraphsLTR; + } +} + +U_CAPI UBool U_EXPORT2 +ubidi_isOrderParagraphsLTR(UBiDi *pBiDi) { + if(pBiDi!=NULL) { + return pBiDi->orderParagraphsLTR; + } else { + return FALSE; + } +} + +U_CAPI UBiDiDirection U_EXPORT2 +ubidi_getDirection(const UBiDi *pBiDi) { + if(IS_VALID_PARA_OR_LINE(pBiDi)) { + return pBiDi->direction; + } else { + return UBIDI_LTR; + } +} + +U_CAPI const UChar * U_EXPORT2 +ubidi_getText(const UBiDi *pBiDi) { + if(IS_VALID_PARA_OR_LINE(pBiDi)) { + return pBiDi->text; + } else { + return NULL; + } +} + +U_CAPI int32_t U_EXPORT2 +ubidi_getLength(const UBiDi *pBiDi) { + if(IS_VALID_PARA_OR_LINE(pBiDi)) { + return pBiDi->originalLength; + } else { + return 0; + } +} + +U_CAPI int32_t U_EXPORT2 +ubidi_getProcessedLength(const UBiDi *pBiDi) { + if(IS_VALID_PARA_OR_LINE(pBiDi)) { + return pBiDi->length; + } else { + return 0; + } +} + +U_CAPI int32_t U_EXPORT2 +ubidi_getResultLength(const UBiDi *pBiDi) { + if(IS_VALID_PARA_OR_LINE(pBiDi)) { + return pBiDi->resultLength; + } else { + return 0; + } +} + +/* paragraphs API functions ------------------------------------------------- */ + +U_CAPI UBiDiLevel U_EXPORT2 +ubidi_getParaLevel(const UBiDi *pBiDi) { + if(IS_VALID_PARA_OR_LINE(pBiDi)) { + return pBiDi->paraLevel; + } else { + return 0; + } +} + +U_CAPI int32_t U_EXPORT2 +ubidi_countParagraphs(UBiDi *pBiDi) { + if(!IS_VALID_PARA_OR_LINE(pBiDi)) { + return 0; + } else { + return pBiDi->paraCount; + } +} + +U_CAPI void U_EXPORT2 +ubidi_getParagraphByIndex(const UBiDi *pBiDi, int32_t paraIndex, + int32_t *pParaStart, int32_t *pParaLimit, + UBiDiLevel *pParaLevel, UErrorCode *pErrorCode) { + int32_t paraStart; + + /* check the argument values */ + RETURN_VOID_IF_NULL_OR_FAILING_ERRCODE(pErrorCode); + RETURN_VOID_IF_NOT_VALID_PARA_OR_LINE(pBiDi, *pErrorCode); + RETURN_VOID_IF_BAD_RANGE(paraIndex, 0, pBiDi->paraCount, *pErrorCode); + + pBiDi=pBiDi->pParaBiDi; /* get Para object if Line object */ + if(paraIndex) { + paraStart=pBiDi->paras[paraIndex-1].limit; + } else { + paraStart=0; + } + if(pParaStart!=NULL) { + *pParaStart=paraStart; + } + if(pParaLimit!=NULL) { + *pParaLimit=pBiDi->paras[paraIndex].limit; + } + if(pParaLevel!=NULL) { + *pParaLevel=GET_PARALEVEL(pBiDi, paraStart); + } +} + +U_CAPI int32_t U_EXPORT2 +ubidi_getParagraph(const UBiDi *pBiDi, int32_t charIndex, + int32_t *pParaStart, int32_t *pParaLimit, + UBiDiLevel *pParaLevel, UErrorCode *pErrorCode) { + int32_t paraIndex; + + /* check the argument values */ + /* pErrorCode will be checked by the call to ubidi_getParagraphByIndex */ + RETURN_IF_NULL_OR_FAILING_ERRCODE(pErrorCode, -1); + RETURN_IF_NOT_VALID_PARA_OR_LINE(pBiDi, *pErrorCode, -1); + pBiDi=pBiDi->pParaBiDi; /* get Para object if Line object */ + RETURN_IF_BAD_RANGE(charIndex, 0, pBiDi->length, *pErrorCode, -1); + + for(paraIndex=0; charIndex>=pBiDi->paras[paraIndex].limit; paraIndex++); + ubidi_getParagraphByIndex(pBiDi, paraIndex, pParaStart, pParaLimit, pParaLevel, pErrorCode); + return paraIndex; +} + +U_CAPI void U_EXPORT2 +ubidi_setClassCallback(UBiDi *pBiDi, UBiDiClassCallback *newFn, + const void *newContext, UBiDiClassCallback **oldFn, + const void **oldContext, UErrorCode *pErrorCode) +{ + RETURN_VOID_IF_NULL_OR_FAILING_ERRCODE(pErrorCode); + if(pBiDi==NULL) { + *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR; + return; + } + if( oldFn ) + { + *oldFn = pBiDi->fnClassCallback; + } + if( oldContext ) + { + *oldContext = pBiDi->coClassCallback; + } + pBiDi->fnClassCallback = newFn; + pBiDi->coClassCallback = newContext; +} + +U_CAPI void U_EXPORT2 +ubidi_getClassCallback(UBiDi *pBiDi, UBiDiClassCallback **fn, const void **context) +{ + if(pBiDi==NULL) { + return; + } + if( fn ) + { + *fn = pBiDi->fnClassCallback; + } + if( context ) + { + *context = pBiDi->coClassCallback; + } +} + +U_CAPI UCharDirection U_EXPORT2 +ubidi_getCustomizedClass(UBiDi *pBiDi, UChar32 c) +{ + UCharDirection dir; + + if( pBiDi->fnClassCallback == NULL || + (dir = (*pBiDi->fnClassCallback)(pBiDi->coClassCallback, c)) == U_BIDI_CLASS_DEFAULT ) + { + dir = ubidi_getClass(pBiDi->bdp, c); + } + if(dir >= U_CHAR_DIRECTION_COUNT) { + dir = ON; + } + return dir; +} |