3010 lines
117 KiB
C
3010 lines
117 KiB
C
/*
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******************************************************************************
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*
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* Copyright (C) 1999-2014, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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******************************************************************************
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* file name: ubidi.c
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* encoding: US-ASCII
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 1999jul27
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* created by: Markus W. Scherer, updated by Matitiahu Allouche
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*
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*/
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#include "cmemory.h"
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#include "unicode/utypes.h"
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#include "unicode/ustring.h"
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#include "unicode/uchar.h"
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#include "unicode/ubidi.h"
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#include "unicode/utf16.h"
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#include "ubidi_props.h"
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#include "ubidiimp.h"
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#include "uassert.h"
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/*
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* General implementation notes:
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*
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* Throughout the implementation, there are comments like (W2) that refer to
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* rules of the BiDi algorithm, in this example to the second rule of the
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* resolution of weak types.
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*
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* For handling surrogate pairs, where two UChar's form one "abstract" (or UTF-32)
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* character according to UTF-16, the second UChar gets the directional property of
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* the entire character assigned, while the first one gets a BN, a boundary
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* neutral, type, which is ignored by most of the algorithm according to
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* rule (X9) and the implementation suggestions of the BiDi algorithm.
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*
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* Later, adjustWSLevels() will set the level for each BN to that of the
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* following character (UChar), which results in surrogate pairs getting the
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* same level on each of their surrogates.
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*
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* In a UTF-8 implementation, the same thing could be done: the last byte of
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* a multi-byte sequence would get the "real" property, while all previous
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* bytes of that sequence would get BN.
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*
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* It is not possible to assign all those parts of a character the same real
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* property because this would fail in the resolution of weak types with rules
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* that look at immediately surrounding types.
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*
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* As a related topic, this implementation does not remove Boundary Neutral
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* types from the input, but ignores them wherever this is relevant.
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* For example, the loop for the resolution of the weak types reads
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* types until it finds a non-BN.
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* Also, explicit embedding codes are neither changed into BN nor removed.
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* They are only treated the same way real BNs are.
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* As stated before, adjustWSLevels() takes care of them at the end.
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* For the purpose of conformance, the levels of all these codes
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* do not matter.
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*
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* Note that this implementation modifies the dirProps
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* after the initial setup, when applying X5c (replace FSI by LRI or RLI),
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* X6, N0 (replace paired brackets by L or R).
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*
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* In this implementation, the resolution of weak types (W1 to W6),
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* neutrals (N1 and N2), and the assignment of the resolved level (In)
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* are all done in one single loop, in resolveImplicitLevels().
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* Changes of dirProp values are done on the fly, without writing
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* them back to the dirProps array.
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*
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*
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* This implementation contains code that allows to bypass steps of the
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* algorithm that are not needed on the specific paragraph
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* in order to speed up the most common cases considerably,
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* like text that is entirely LTR, or RTL text without numbers.
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*
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* Most of this is done by setting a bit for each directional property
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* in a flags variable and later checking for whether there are
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* any LTR characters or any RTL characters, or both, whether
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* there are any explicit embedding codes, etc.
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*
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* If the (Xn) steps are performed, then the flags are re-evaluated,
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* because they will then not contain the embedding codes any more
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* and will be adjusted for override codes, so that subsequently
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* more bypassing may be possible than what the initial flags suggested.
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*
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* If the text is not mixed-directional, then the
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* algorithm steps for the weak type resolution are not performed,
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* and all levels are set to the paragraph level.
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*
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* If there are no explicit embedding codes, then the (Xn) steps
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* are not performed.
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*
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* If embedding levels are supplied as a parameter, then all
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* explicit embedding codes are ignored, and the (Xn) steps
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* are not performed.
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*
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* White Space types could get the level of the run they belong to,
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* and are checked with a test of (flags&MASK_EMBEDDING) to
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* consider if the paragraph direction should be considered in
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* the flags variable.
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*
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* If there are no White Space types in the paragraph, then
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* (L1) is not necessary in adjustWSLevels().
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*/
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/* to avoid some conditional statements, use tiny constant arrays */
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static const Flags flagLR[2]={ DIRPROP_FLAG(L), DIRPROP_FLAG(R) };
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static const Flags flagE[2]={ DIRPROP_FLAG(LRE), DIRPROP_FLAG(RLE) };
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static const Flags flagO[2]={ DIRPROP_FLAG(LRO), DIRPROP_FLAG(RLO) };
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#define DIRPROP_FLAG_LR(level) flagLR[(level)&1]
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#define DIRPROP_FLAG_E(level) flagE[(level)&1]
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#define DIRPROP_FLAG_O(level) flagO[(level)&1]
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#define DIR_FROM_STRONG(strong) ((strong)==L ? L : R)
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#define NO_OVERRIDE(level) ((level)&~UBIDI_LEVEL_OVERRIDE)
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/* UBiDi object management -------------------------------------------------- */
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U_CAPI UBiDi * U_EXPORT2
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ubidi_open(void)
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{
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UErrorCode errorCode=U_ZERO_ERROR;
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return ubidi_openSized(0, 0, &errorCode);
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}
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U_CAPI UBiDi * U_EXPORT2
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ubidi_openSized(int32_t maxLength, int32_t maxRunCount, UErrorCode *pErrorCode) {
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UBiDi *pBiDi;
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/* check the argument values */
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if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) {
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return NULL;
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} else if(maxLength<0 || maxRunCount<0) {
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*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
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return NULL; /* invalid arguments */
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}
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/* allocate memory for the object */
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pBiDi=(UBiDi *)uprv_malloc(sizeof(UBiDi));
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if(pBiDi==NULL) {
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*pErrorCode=U_MEMORY_ALLOCATION_ERROR;
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return NULL;
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}
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/* reset the object, all pointers NULL, all flags FALSE, all sizes 0 */
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uprv_memset(pBiDi, 0, sizeof(UBiDi));
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/* get BiDi properties */
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pBiDi->bdp=ubidi_getSingleton();
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/* allocate memory for arrays as requested */
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if(maxLength>0) {
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if( !getInitialDirPropsMemory(pBiDi, maxLength) ||
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!getInitialLevelsMemory(pBiDi, maxLength)
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) {
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*pErrorCode=U_MEMORY_ALLOCATION_ERROR;
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}
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} else {
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pBiDi->mayAllocateText=TRUE;
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}
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if(maxRunCount>0) {
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if(maxRunCount==1) {
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/* use simpleRuns[] */
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pBiDi->runsSize=sizeof(Run);
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} else if(!getInitialRunsMemory(pBiDi, maxRunCount)) {
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*pErrorCode=U_MEMORY_ALLOCATION_ERROR;
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}
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} else {
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pBiDi->mayAllocateRuns=TRUE;
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}
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if(U_SUCCESS(*pErrorCode)) {
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return pBiDi;
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} else {
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ubidi_close(pBiDi);
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return NULL;
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}
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}
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/*
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* We are allowed to allocate memory if memory==NULL or
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* mayAllocate==TRUE for each array that we need.
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* We also try to grow memory as needed if we
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* allocate it.
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*
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* Assume sizeNeeded>0.
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* If *pMemory!=NULL, then assume *pSize>0.
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*
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* ### this realloc() may unnecessarily copy the old data,
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* which we know we don't need any more;
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* is this the best way to do this??
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*/
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U_CFUNC UBool
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ubidi_getMemory(BidiMemoryForAllocation *bidiMem, int32_t *pSize, UBool mayAllocate, int32_t sizeNeeded) {
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void **pMemory = (void **)bidiMem;
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/* check for existing memory */
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if(*pMemory==NULL) {
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/* we need to allocate memory */
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if(mayAllocate && (*pMemory=uprv_malloc(sizeNeeded))!=NULL) {
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*pSize=sizeNeeded;
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return TRUE;
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} else {
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return FALSE;
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}
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} else {
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if(sizeNeeded<=*pSize) {
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/* there is already enough memory */
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return TRUE;
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}
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else if(!mayAllocate) {
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/* not enough memory, and we must not allocate */
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return FALSE;
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} else {
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/* we try to grow */
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void *memory;
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/* in most cases, we do not need the copy-old-data part of
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* realloc, but it is needed when adding runs using getRunsMemory()
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* in setParaRunsOnly()
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*/
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if((memory=uprv_realloc(*pMemory, sizeNeeded))!=NULL) {
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*pMemory=memory;
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*pSize=sizeNeeded;
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return TRUE;
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} else {
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/* we failed to grow */
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return FALSE;
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}
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}
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}
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}
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U_CAPI void U_EXPORT2
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ubidi_close(UBiDi *pBiDi) {
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if(pBiDi!=NULL) {
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pBiDi->pParaBiDi=NULL; /* in case one tries to reuse this block */
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if(pBiDi->dirPropsMemory!=NULL) {
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uprv_free(pBiDi->dirPropsMemory);
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}
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if(pBiDi->levelsMemory!=NULL) {
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uprv_free(pBiDi->levelsMemory);
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}
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if(pBiDi->openingsMemory!=NULL) {
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uprv_free(pBiDi->openingsMemory);
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}
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if(pBiDi->parasMemory!=NULL) {
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uprv_free(pBiDi->parasMemory);
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}
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if(pBiDi->runsMemory!=NULL) {
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uprv_free(pBiDi->runsMemory);
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}
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if(pBiDi->isolatesMemory!=NULL) {
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uprv_free(pBiDi->isolatesMemory);
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}
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if(pBiDi->insertPoints.points!=NULL) {
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uprv_free(pBiDi->insertPoints.points);
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}
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uprv_free(pBiDi);
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}
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}
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/* set to approximate "inverse BiDi" ---------------------------------------- */
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U_CAPI void U_EXPORT2
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ubidi_setInverse(UBiDi *pBiDi, UBool isInverse) {
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if(pBiDi!=NULL) {
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pBiDi->isInverse=isInverse;
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pBiDi->reorderingMode = isInverse ? UBIDI_REORDER_INVERSE_NUMBERS_AS_L
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: UBIDI_REORDER_DEFAULT;
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}
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}
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U_CAPI UBool U_EXPORT2
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ubidi_isInverse(UBiDi *pBiDi) {
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if(pBiDi!=NULL) {
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return pBiDi->isInverse;
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} else {
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return FALSE;
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}
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}
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/* FOOD FOR THOUGHT: currently the reordering modes are a mixture of
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* algorithm for direct BiDi, algorithm for inverse BiDi and the bizarre
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* concept of RUNS_ONLY which is a double operation.
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* It could be advantageous to divide this into 3 concepts:
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* a) Operation: direct / inverse / RUNS_ONLY
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* b) Direct algorithm: default / NUMBERS_SPECIAL / GROUP_NUMBERS_WITH_R
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* c) Inverse algorithm: default / INVERSE_LIKE_DIRECT / NUMBERS_SPECIAL
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* This would allow combinations not possible today like RUNS_ONLY with
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* NUMBERS_SPECIAL.
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* Also allow to set INSERT_MARKS for the direct step of RUNS_ONLY and
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* REMOVE_CONTROLS for the inverse step.
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* Not all combinations would be supported, and probably not all do make sense.
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* This would need to document which ones are supported and what are the
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* fallbacks for unsupported combinations.
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*/
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U_CAPI void U_EXPORT2
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ubidi_setReorderingMode(UBiDi *pBiDi, UBiDiReorderingMode reorderingMode) {
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if ((pBiDi!=NULL) && (reorderingMode >= UBIDI_REORDER_DEFAULT)
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&& (reorderingMode < UBIDI_REORDER_COUNT)) {
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pBiDi->reorderingMode = reorderingMode;
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pBiDi->isInverse = (UBool)(reorderingMode == UBIDI_REORDER_INVERSE_NUMBERS_AS_L);
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}
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}
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U_CAPI UBiDiReorderingMode U_EXPORT2
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ubidi_getReorderingMode(UBiDi *pBiDi) {
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if (pBiDi!=NULL) {
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return pBiDi->reorderingMode;
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} else {
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return UBIDI_REORDER_DEFAULT;
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}
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}
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U_CAPI void U_EXPORT2
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ubidi_setReorderingOptions(UBiDi *pBiDi, uint32_t reorderingOptions) {
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if (reorderingOptions & UBIDI_OPTION_REMOVE_CONTROLS) {
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reorderingOptions&=~UBIDI_OPTION_INSERT_MARKS;
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}
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if (pBiDi!=NULL) {
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pBiDi->reorderingOptions=reorderingOptions;
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}
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}
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U_CAPI uint32_t U_EXPORT2
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ubidi_getReorderingOptions(UBiDi *pBiDi) {
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if (pBiDi!=NULL) {
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return pBiDi->reorderingOptions;
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} else {
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return 0;
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}
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}
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U_CAPI UBiDiDirection U_EXPORT2
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ubidi_getBaseDirection(const UChar *text,
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int32_t length){
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int32_t i;
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UChar32 uchar;
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UCharDirection dir;
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if( text==NULL || length<-1 ){
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return UBIDI_NEUTRAL;
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}
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if(length==-1) {
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length=u_strlen(text);
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}
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for( i = 0 ; i < length; ) {
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/* i is incremented by U16_NEXT */
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U16_NEXT(text, i, length, uchar);
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dir = u_charDirection(uchar);
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if( dir == U_LEFT_TO_RIGHT )
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return UBIDI_LTR;
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if( dir == U_RIGHT_TO_LEFT || dir ==U_RIGHT_TO_LEFT_ARABIC )
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return UBIDI_RTL;
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}
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return UBIDI_NEUTRAL;
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}
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/* perform (P2)..(P3) ------------------------------------------------------- */
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/**
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* Returns the directionality of the first strong character
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* after the last B in prologue, if any.
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* Requires prologue!=null.
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*/
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static DirProp
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firstL_R_AL(UBiDi *pBiDi) {
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const UChar *text=pBiDi->prologue;
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int32_t length=pBiDi->proLength;
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int32_t i;
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UChar32 uchar;
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DirProp dirProp, result=ON;
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for(i=0; i<length; ) {
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/* i is incremented by U16_NEXT */
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U16_NEXT(text, i, length, uchar);
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dirProp=(DirProp)ubidi_getCustomizedClass(pBiDi, uchar);
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if(result==ON) {
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if(dirProp==L || dirProp==R || dirProp==AL) {
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result=dirProp;
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}
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} else {
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if(dirProp==B) {
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result=ON;
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}
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}
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}
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return result;
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}
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/*
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* Check that there are enough entries in the array pointed to by pBiDi->paras
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*/
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static UBool
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checkParaCount(UBiDi *pBiDi) {
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int32_t count=pBiDi->paraCount;
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if(pBiDi->paras==pBiDi->simpleParas) {
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if(count<=SIMPLE_PARAS_SIZE)
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return TRUE;
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if(!getInitialParasMemory(pBiDi, SIMPLE_PARAS_SIZE * 2))
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return FALSE;
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pBiDi->paras=pBiDi->parasMemory;
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uprv_memcpy(pBiDi->parasMemory, pBiDi->simpleParas, SIMPLE_PARAS_SIZE * sizeof(Para));
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return TRUE;
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}
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if(!getInitialParasMemory(pBiDi, count * 2))
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return FALSE;
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pBiDi->paras=pBiDi->parasMemory;
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return TRUE;
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}
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/*
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* Get the directional properties for the text, calculate the flags bit-set, and
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* determine the paragraph level if necessary (in pBiDi->paras[i].level).
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* FSI initiators are also resolved and their dirProp replaced with LRI or RLI.
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* When encountering an FSI, it is initially replaced with an LRI, which is the
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* default. Only if a strong R or AL is found within its scope will the LRI be
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* replaced by an RLI.
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*/
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static UBool
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getDirProps(UBiDi *pBiDi) {
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const UChar *text=pBiDi->text;
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DirProp *dirProps=pBiDi->dirPropsMemory; /* pBiDi->dirProps is const */
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int32_t i=0, originalLength=pBiDi->originalLength;
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Flags flags=0; /* collect all directionalities in the text */
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UChar32 uchar;
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DirProp dirProp=0, defaultParaLevel=0; /* initialize to avoid compiler warnings */
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UBool isDefaultLevel=IS_DEFAULT_LEVEL(pBiDi->paraLevel);
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/* for inverse BiDi, the default para level is set to RTL if there is a
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strong R or AL character at either end of the text */
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UBool isDefaultLevelInverse=isDefaultLevel && (UBool)
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(pBiDi->reorderingMode==UBIDI_REORDER_INVERSE_LIKE_DIRECT ||
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pBiDi->reorderingMode==UBIDI_REORDER_INVERSE_FOR_NUMBERS_SPECIAL);
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int32_t lastArabicPos=-1;
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int32_t controlCount=0;
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UBool removeBiDiControls = (UBool)(pBiDi->reorderingOptions &
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UBIDI_OPTION_REMOVE_CONTROLS);
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typedef enum {
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NOT_SEEKING_STRONG, /* 0: not contextual paraLevel, not after FSI */
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SEEKING_STRONG_FOR_PARA, /* 1: looking for first strong char in para */
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SEEKING_STRONG_FOR_FSI, /* 2: looking for first strong after FSI */
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LOOKING_FOR_PDI /* 3: found strong after FSI, looking for PDI */
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} State;
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State state;
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DirProp lastStrong=ON; /* for default level & inverse BiDi */
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/* The following stacks are used to manage isolate sequences. Those
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sequences may be nested, but obviously never more deeply than the
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maximum explicit embedding level.
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lastStack is the index of the last used entry in the stack. A value of -1
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means that there is no open isolate sequence.
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lastStack is reset to -1 on paragraph boundaries. */
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/* The following stack contains the position of the initiator of
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each open isolate sequence */
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int32_t isolateStartStack[UBIDI_MAX_EXPLICIT_LEVEL+1];
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/* The following stack contains the last known state before
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encountering the initiator of an isolate sequence */
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int8_t previousStateStack[UBIDI_MAX_EXPLICIT_LEVEL+1];
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int32_t stackLast=-1;
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if(pBiDi->reorderingOptions & UBIDI_OPTION_STREAMING)
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pBiDi->length=0;
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defaultParaLevel=pBiDi->paraLevel&1;
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if(isDefaultLevel) {
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pBiDi->paras[0].level=defaultParaLevel;
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lastStrong=defaultParaLevel;
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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_SIZE;
|
|
}
|
|
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_SIZE * 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) {
|
|
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(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;
|
|
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, 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, saveLength*sizeof(UBiDiLevel));
|
|
pBiDi->trailingWSStart=saveTrailingWSStart;
|
|
/* free memory for mapping table and visual text */
|
|
uprv_free(runsOnlyMemory);
|
|
if(pBiDi->runCount>1) {
|
|
pBiDi->direction=UBIDI_MIXED;
|
|
}
|
|
cleanup3:
|
|
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_SIZE)
|
|
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;
|
|
}
|