218 lines
7.4 KiB
C
218 lines
7.4 KiB
C
/*
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*******************************************************************************
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*
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* Copyright (C) 1999, 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: ubidiimp.h
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* encoding: US-ASCII
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 1999aug06
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* created by: Markus W. Scherer
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*/
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#ifndef UBIDIIMP_H
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#define UBIDIIMP_H
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/* set import/export definitions */
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#ifdef U_COMMON_IMPLEMENTATION
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#include "utypes.h"
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#include "uchar.h"
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/* miscellaneous definitions ------------------------------------------------ */
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typedef uint8_t DirProp;
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typedef uint32_t Flags;
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/* Comparing the description of the BiDi algorithm with this implementation
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is easier with the same names for the BiDi types in the code as there.
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See UCharDirection in uchar.h .
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*/
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enum {
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L= U_LEFT_TO_RIGHT,
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R= U_RIGHT_TO_LEFT,
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EN= U_EUROPEAN_NUMBER,
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ES= U_EUROPEAN_NUMBER_SEPARATOR,
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ET= U_EUROPEAN_NUMBER_TERMINATOR,
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AN= U_ARABIC_NUMBER,
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CS= U_COMMON_NUMBER_SEPARATOR,
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B= U_BLOCK_SEPARATOR,
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S= U_SEGMENT_SEPARATOR,
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WS= U_WHITE_SPACE_NEUTRAL,
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ON= U_OTHER_NEUTRAL,
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LRE=U_LEFT_TO_RIGHT_EMBEDDING,
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LRO=U_LEFT_TO_RIGHT_OVERRIDE,
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AL= U_RIGHT_TO_LEFT_ARABIC,
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RLE=U_RIGHT_TO_LEFT_EMBEDDING,
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RLO=U_RIGHT_TO_LEFT_OVERRIDE,
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PDF=U_POP_DIRECTIONAL_FORMAT,
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NSM=U_DIR_NON_SPACING_MARK,
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BN= U_BOUNDARY_NEUTRAL,
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dirPropCount
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};
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/*
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* Sometimes, bit values are more appropriate
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* to deal with directionality properties.
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* Abbreviations in these macro names refer to names
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* used in the BiDi algorithm.
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*/
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#define DIRPROP_FLAG(dir) (1UL<<(dir))
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/* special flag for multiple runs from explicit embedding codes */
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#define DIRPROP_FLAG_MULTI_RUNS (1UL<<31)
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/* are there any characters that are LTR or RTL? */
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#define MASK_LTR (DIRPROP_FLAG(L)|DIRPROP_FLAG(EN)|DIRPROP_FLAG(AN)|DIRPROP_FLAG(LRE)|DIRPROP_FLAG(LRO))
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#define MASK_RTL (DIRPROP_FLAG(R)|DIRPROP_FLAG(AL)|DIRPROP_FLAG(RLE)|DIRPROP_FLAG(RLO))
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/* explicit embedding codes */
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#define MASK_LRX (DIRPROP_FLAG(LRE)|DIRPROP_FLAG(LRO))
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#define MASK_RLX (DIRPROP_FLAG(RLE)|DIRPROP_FLAG(RLO))
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#define MASK_OVERRIDE (DIRPROP_FLAG(LRO)|DIRPROP_FLAG(RLO))
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#define MASK_EXPLICIT (MASK_LRX|MASK_RLX|DIRPROP_FLAG(PDF))
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#define MASK_BN_EXPLICIT (DIRPROP_FLAG(BN)|MASK_EXPLICIT)
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/* paragraph and segment separators */
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#define MASK_B_S (DIRPROP_FLAG(B)|DIRPROP_FLAG(S))
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/* all types that are counted as White Space or Neutral in some steps */
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#define MASK_WS (MASK_B_S|DIRPROP_FLAG(WS)|MASK_BN_EXPLICIT)
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#define MASK_N (DIRPROP_FLAG(ON)|MASK_WS)
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/* all types that are included in a sequence of European Terminators for (W5) */
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#define MASK_ET_NSM_BN (DIRPROP_FLAG(ET)|DIRPROP_FLAG(NSM)|MASK_BN_EXPLICIT)
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/* types that are neutrals or could becomes neutrals in (Wn) */
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#define MASK_POSSIBLE_N (DIRPROP_FLAG(CS)|DIRPROP_FLAG(ES)|DIRPROP_FLAG(ET)|MASK_N)
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/*
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* These types may be changed to "e",
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* the embedding type (L or R) of the run,
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* in the BiDi algorithm (N2)
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*/
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#define MASK_EMBEDDING (DIRPROP_FLAG(NSM)|MASK_POSSIBLE_N)
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/* to avoid some conditional statements, use tiny constant arrays */
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static Flags flagLR[2]={ DIRPROP_FLAG(L), DIRPROP_FLAG(R) };
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static Flags flagE[2]={ DIRPROP_FLAG(LRE), DIRPROP_FLAG(RLE) };
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static 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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/* the dirProp's L and R are defined to 0 and 1 values in UCharDirection */
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#define GET_LR_FROM_LEVEL(level) ((DirProp)((level)&1))
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#define IS_DEFAULT_LEVEL(level) (((level)&0xfe)==0xfe)
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/* handle surrogate pairs --------------------------------------------------- */
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#define IS_FIRST_SURROGATE(uchar) (((uchar)&0xfc00)==0xd800)
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#define IS_SECOND_SURROGATE(uchar) (((uchar)&0xfc00)==0xdc00)
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/* get the UTF-32 value directly from the surrogate pseudo-characters */
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#define SURROGATE_OFFSET ((0xd800<<10UL)+0xdc00-0x10000)
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#define GET_UTF_32(first, second) (((first)<<10UL)+(second)-SURROGATE_OFFSET)
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/* Run structure for reordering --------------------------------------------- */
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typedef struct Run {
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UTextOffset logicalStart, /* first character of the run; b31 indicates even/odd level */
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visualLimit; /* last visual position of the run +1 */
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} Run;
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/* in a Run, logicalStart will get this bit set if the run level is odd */
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#define INDEX_ODD_BIT (1UL<<31)
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#define MAKE_INDEX_ODD_PAIR(index, level) (index|((uint32_t)level<<31))
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#define ADD_ODD_BIT_FROM_LEVEL(x, level) ((x)|=((uint32_t)level<<31))
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#define REMOVE_ODD_BIT(x) ((x)&=~INDEX_ODD_BIT)
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#define GET_INDEX(x) (x&~INDEX_ODD_BIT)
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#define GET_ODD_BIT(x) ((uint32_t)x>>31)
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#define IS_ODD_RUN(x) ((x&INDEX_ODD_BIT)!=0)
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#define IS_EVEN_RUN(x) ((x&INDEX_ODD_BIT)==0)
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/* UBiDi structure ----------------------------------------------------------- */
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struct UBiDi {
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/* length of the current text */
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UTextOffset length;
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/* memory sizes in bytes */
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UTextOffset dirPropsSize, levelsSize, runsSize;
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/* allocated memory */
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DirProp *dirPropsMemory;
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UBiDiLevel *levelsMemory;
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Run *runsMemory;
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/* indicators for whether memory may be allocated after ubidi_open() */
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bool_t mayAllocateText, mayAllocateRuns;
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/* arrays with one value per text-character */
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const DirProp *dirProps;
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UBiDiLevel *levels;
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/* the paragraph level */
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UBiDiLevel paraLevel;
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/* flags is a bit set for which directional properties are in the text */
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Flags flags;
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/* the overall paragraph or line directionality - see UBiDiDirection */
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UBiDiDirection direction;
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/* characters after trailingWSStart are WS and are */
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/* implicitly at the paraLevel (rule (L1)) - levels may not reflect that */
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UTextOffset trailingWSStart;
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/* fields for line reordering */
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UTextOffset runCount; /* ==-1: runs not set up yet */
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Run *runs;
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/* for non-mixed text, we only need a tiny array of runs (no malloc()) */
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Run simpleRuns[1];
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};
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/* helper function to (re)allocate memory if allowed */
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extern bool_t
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getMemory(void **pMemory, UTextOffset *pSize, bool_t mayAllocate, UTextOffset sizeNeeded);
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/* helper macros for each allocated array in UBiDi */
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#define getDirPropsMemory(pBiDi, length) \
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getMemory((void **)&(pBiDi)->dirPropsMemory, &(pBiDi)->dirPropsSize, \
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(pBiDi)->mayAllocateText, (length))
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#define getLevelsMemory(pBiDi, length) \
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getMemory((void **)&(pBiDi)->levelsMemory, &(pBiDi)->levelsSize, \
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(pBiDi)->mayAllocateText, (length))
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#define getRunsMemory(pBiDi, length) \
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getMemory((void **)&(pBiDi)->runsMemory, &(pBiDi)->runsSize, \
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(pBiDi)->mayAllocateRuns, (length)*sizeof(Run))
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/* additional macros used by ubidi_open() - always allow allocation */
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#define getInitialDirPropsMemory(pBiDi, length) \
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getMemory((void **)&(pBiDi)->dirPropsMemory, &(pBiDi)->dirPropsSize, \
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TRUE, (length))
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#define getInitialLevelsMemory(pBiDi, length) \
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getMemory((void **)&(pBiDi)->levelsMemory, &(pBiDi)->levelsSize, \
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TRUE, (length))
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#define getInitialRunsMemory(pBiDi, length) \
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getMemory((void **)&(pBiDi)->runsMemory, &(pBiDi)->runsSize, \
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TRUE, (length)*sizeof(Run))
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#endif
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#endif
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