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			484 lines
		
	
	
	
		
			18 KiB
		
	
	
	
		
			C
		
	
	
	
	
	
			
		
		
	
	
			484 lines
		
	
	
	
		
			18 KiB
		
	
	
	
		
			C
		
	
	
	
	
	
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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******************************************************************************
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*
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*   Copyright (C) 1999-2016, 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:   UTF-8
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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, updated by Matitiahu Allouche
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*/
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#ifndef UBIDIIMP_H
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#define UBIDIIMP_H
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#include "unicode/utypes.h"
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#include "unicode/ubidi.h"
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#include "unicode/uchar.h"
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#include "ubidi_props.h"
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/* miscellaneous definitions ---------------------------------------------- */
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// ICU-20853=ICU-20935 Solaris #defines CS and ES in sys/regset.h
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#ifdef CS
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#   undef CS
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#endif
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#ifdef ES
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#   undef ES
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#endif
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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,                /*  0 */
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    R=  U_RIGHT_TO_LEFT,                /*  1 */
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    EN= U_EUROPEAN_NUMBER,              /*  2 */
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    ES= U_EUROPEAN_NUMBER_SEPARATOR,    /*  3 */
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    ET= U_EUROPEAN_NUMBER_TERMINATOR,   /*  4 */
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    AN= U_ARABIC_NUMBER,                /*  5 */
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    CS= U_COMMON_NUMBER_SEPARATOR,      /*  6 */
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    B=  U_BLOCK_SEPARATOR,              /*  7 */
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    S=  U_SEGMENT_SEPARATOR,            /*  8 */
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    WS= U_WHITE_SPACE_NEUTRAL,          /*  9 */
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    ON= U_OTHER_NEUTRAL,                /* 10 */
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    LRE=U_LEFT_TO_RIGHT_EMBEDDING,      /* 11 */
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    LRO=U_LEFT_TO_RIGHT_OVERRIDE,       /* 12 */
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    AL= U_RIGHT_TO_LEFT_ARABIC,         /* 13 */
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    RLE=U_RIGHT_TO_LEFT_EMBEDDING,      /* 14 */
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    RLO=U_RIGHT_TO_LEFT_OVERRIDE,       /* 15 */
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    PDF=U_POP_DIRECTIONAL_FORMAT,       /* 16 */
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    NSM=U_DIR_NON_SPACING_MARK,         /* 17 */
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    BN= U_BOUNDARY_NEUTRAL,             /* 18 */
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    FSI=U_FIRST_STRONG_ISOLATE,         /* 19 */
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    LRI=U_LEFT_TO_RIGHT_ISOLATE,        /* 20 */
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    RLI=U_RIGHT_TO_LEFT_ISOLATE,        /* 21 */
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    PDI=U_POP_DIRECTIONAL_ISOLATE,      /* 22 */
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    ENL,    /* EN after W7 */           /* 23 */
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    ENR,    /* EN not subject to W7 */  /* 24 */
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    dirPropCount
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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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#define PURE_DIRPROP(prop)  ((prop)&~0xE0)    ?????????????????????????
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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(ENL)|DIRPROP_FLAG(ENR)|DIRPROP_FLAG(AN)|DIRPROP_FLAG(LRE)|DIRPROP_FLAG(LRO)|DIRPROP_FLAG(LRI))
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#define MASK_RTL (DIRPROP_FLAG(R)|DIRPROP_FLAG(AL)|DIRPROP_FLAG(RLE)|DIRPROP_FLAG(RLO)|DIRPROP_FLAG(RLI))
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#define MASK_R_AL (DIRPROP_FLAG(R)|DIRPROP_FLAG(AL))
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#define MASK_STRONG_EN_AN (DIRPROP_FLAG(L)|DIRPROP_FLAG(R)|DIRPROP_FLAG(AL)|DIRPROP_FLAG(EN)|DIRPROP_FLAG(AN))
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/* explicit embedding codes */
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#define MASK_EXPLICIT (DIRPROP_FLAG(LRE)|DIRPROP_FLAG(LRO)|DIRPROP_FLAG(RLE)|DIRPROP_FLAG(RLO)|DIRPROP_FLAG(PDF))
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/* explicit isolate codes */
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#define MASK_ISO (DIRPROP_FLAG(LRI)|DIRPROP_FLAG(RLI)|DIRPROP_FLAG(FSI)|DIRPROP_FLAG(PDI))
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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|MASK_ISO)
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/* types that are neutrals or could becomes neutrals in (Wn) */
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#define MASK_POSSIBLE_N (DIRPROP_FLAG(ON)|DIRPROP_FLAG(CS)|DIRPROP_FLAG(ES)|DIRPROP_FLAG(ET)|MASK_WS)
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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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/* 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)
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/*
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 *  The following bit is used for the directional isolate status.
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 *  Stack entries corresponding to isolate sequences are greater than ISOLATE.
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 */
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#define ISOLATE  0x0100
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U_CFUNC UBiDiLevel
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ubidi_getParaLevelAtIndex(const UBiDi *pBiDi, int32_t index);
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#define GET_PARALEVEL(ubidi, index) \
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            ((UBiDiLevel)(!(ubidi)->defaultParaLevel || (index)<(ubidi)->paras[0].limit ? \
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                         (ubidi)->paraLevel : ubidi_getParaLevelAtIndex((ubidi), (index))))
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/* number of paras entries allocated initially without malloc */
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#define SIMPLE_PARAS_COUNT      10
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/* number of isolate entries allocated initially without malloc */
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#define SIMPLE_ISOLATES_COUNT   5
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/* number of isolate run entries for paired brackets allocated initially without malloc */
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#define SIMPLE_OPENINGS_COUNT   20
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#define CR  0x000D
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#define LF  0x000A
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/* Run structure for reordering --------------------------------------------- */
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enum {
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    LRM_BEFORE=1,
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    LRM_AFTER=2,
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    RLM_BEFORE=4,
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    RLM_AFTER=8
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};
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typedef struct Para {
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    int32_t limit;
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    int32_t level;
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} Para;
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enum {                                  /* flags for Opening.flags */
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    FOUND_L=DIRPROP_FLAG(L),
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    FOUND_R=DIRPROP_FLAG(R)
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};
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typedef struct Opening {
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    int32_t position;                   /* position of opening bracket */
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    int32_t match;                      /* matching char or -position of closing bracket */
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    int32_t contextPos;                 /* position of last strong char found before opening */
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    uint16_t flags;                     /* bits for L or R/AL found within the pair */
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    UBiDiDirection contextDir;          /* L or R according to last strong char before opening */
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    uint8_t filler;                     /* to complete a nice multiple of 4 chars */
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} Opening;
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typedef struct IsoRun {
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    int32_t  contextPos;                /* position of char determining context */
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    uint16_t start;                     /* index of first opening entry for this run */
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    uint16_t limit;                     /* index after last opening entry for this run */
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    UBiDiLevel level;                   /* level of this run */
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    DirProp lastStrong;                 /* bidi class of last strong char found in this run */
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    DirProp lastBase;                   /* bidi class of last base char found in this run */
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    UBiDiDirection contextDir;          /* L or R to use as context for following openings */
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} IsoRun;
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typedef struct BracketData {
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    UBiDi   *pBiDi;
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    /* array of opening entries which should be enough in most cases; no malloc() */
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    Opening simpleOpenings[SIMPLE_OPENINGS_COUNT];
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    Opening *openings;                  /* pointer to current array of entries */
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    int32_t openingsCount;              /* number of allocated entries */
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    int32_t isoRunLast;                 /* index of last used entry */
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    /* array of nested isolated sequence entries; can never excess UBIDI_MAX_EXPLICIT_LEVEL
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       + 1 for index 0, + 1 for before the first isolated sequence */
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    IsoRun  isoRuns[UBIDI_MAX_EXPLICIT_LEVEL+2];
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    UBool isNumbersSpecial;             /* reordering mode for NUMBERS_SPECIAL */
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} BracketData;
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typedef struct Isolate {
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    int32_t startON;
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    int32_t start1;
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    int32_t state;
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    int16_t stateImp;
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} Isolate;
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typedef struct Run {
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    int32_t 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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            insertRemove;   /* if >0, flags for inserting LRM/RLM before/after run,
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                               if <0, count of bidi controls within run            */
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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)|((int32_t)((level)&1)<<31))
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#define ADD_ODD_BIT_FROM_LEVEL(x, level)  ((x)|=((int32_t)((level)&1)<<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)  ((UBool)(((x)&INDEX_ODD_BIT)!=0))
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#define IS_EVEN_RUN(x) ((UBool)(((x)&INDEX_ODD_BIT)==0))
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U_CFUNC UBool
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ubidi_getRuns(UBiDi *pBiDi, UErrorCode *pErrorCode);
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/** BiDi control code points */
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enum {
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    ZWNJ_CHAR=0x200c,
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    ZWJ_CHAR,
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    LRM_CHAR,
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    RLM_CHAR,
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    LRE_CHAR=0x202a,
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    RLE_CHAR,
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    PDF_CHAR,
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    LRO_CHAR,
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    RLO_CHAR,
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    LRI_CHAR=0x2066,
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    RLI_CHAR,
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    FSI_CHAR,
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    PDI_CHAR
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};
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#define IS_BIDI_CONTROL_CHAR(c) (((uint32_t)(c)&0xfffffffc)==ZWNJ_CHAR || (uint32_t)((c)-LRE_CHAR)<5 || (uint32_t)((c)-LRI_CHAR)<4)
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/* InsertPoints structure for noting where to put BiDi marks ---------------- */
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typedef struct Point {
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    int32_t pos;            /* position in text */
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    int32_t flag;           /* flag for LRM/RLM, before/after */
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} Point;
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typedef struct InsertPoints {
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    int32_t capacity;       /* number of points allocated */
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    int32_t size;           /* number of points used */
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    int32_t confirmed;      /* number of points confirmed */
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    UErrorCode errorCode;   /* for eventual memory shortage */
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    Point *points;          /* pointer to array of points */
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} InsertPoints;
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/* UBiDi structure ----------------------------------------------------------- */
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struct UBiDi {
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    /* pointer to parent paragraph object (pointer to self if this object is
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     * a paragraph object); set to NULL in a newly opened object; set to a
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     * real value after a successful execution of ubidi_setPara or ubidi_setLine
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     */
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    const UBiDi * pParaBiDi;
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    /* alias pointer to the current text */
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    const UChar *text;
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    /* length of the current text */
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    int32_t originalLength;
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    /* if the UBIDI_OPTION_STREAMING option is set, this is the length
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     * of text actually processed by ubidi_setPara, which may be shorter than
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     * the original length.
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     * Otherwise, it is identical to the original length.
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     */
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    int32_t length;
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    /* if the UBIDI_OPTION_REMOVE_CONTROLS option is set, and/or
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     * marks are allowed to be inserted in one of the reordering mode, the
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     * length of the result string may be different from the processed length.
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     */
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    int32_t resultLength;
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    /* memory sizes in bytes */
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    int32_t dirPropsSize, levelsSize, openingsSize, parasSize, runsSize, isolatesSize;
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    /* allocated memory */
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    DirProp *dirPropsMemory;
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    UBiDiLevel *levelsMemory;
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    Opening *openingsMemory;
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    Para *parasMemory;
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    Run *runsMemory;
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    Isolate *isolatesMemory;
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    /* indicators for whether memory may be allocated after ubidi_open() */
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    UBool mayAllocateText, mayAllocateRuns;
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    /* arrays with one value per text-character */
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    DirProp *dirProps;
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    UBiDiLevel *levels;
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    /* are we performing an approximation of the "inverse BiDi" algorithm? */
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    UBool isInverse;
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    /* are we using the basic algorithm or its variation? */
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    UBiDiReorderingMode reorderingMode;
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    /* UBIDI_REORDER_xxx values must be ordered so that all the regular
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     * logical to visual modes come first, and all inverse BiDi modes
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     * come last.
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     */
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    #define UBIDI_REORDER_LAST_LOGICAL_TO_VISUAL    UBIDI_REORDER_NUMBERS_SPECIAL
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    /* bitmask for reordering options */
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    uint32_t reorderingOptions;
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    /* must block separators receive level 0? */
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    UBool orderParagraphsLTR;
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    /* the paragraph level */
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    UBiDiLevel paraLevel;
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    /* original paraLevel when contextual */
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    /* must be one of UBIDI_DEFAULT_xxx or 0 if not contextual */
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    UBiDiLevel defaultParaLevel;
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    /* context data */
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    const UChar *prologue;
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    int32_t proLength;
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    const UChar *epilogue;
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    int32_t epiLength;
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    /* the following is set in ubidi_setPara, used in processPropertySeq */
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    const struct ImpTabPair * pImpTabPair;  /* pointer to levels state table pair */
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    /* the overall paragraph or line directionality - see UBiDiDirection */
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    UBiDiDirection direction;
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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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    /* lastArabicPos is index to the last AL in the text, -1 if none */
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    int32_t lastArabicPos;
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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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    int32_t trailingWSStart;
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    /* fields for paragraph handling */
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    int32_t paraCount;                  /* set in getDirProps() */
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    /* filled in getDirProps() */
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    Para *paras;
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    /* for relatively short text, we only need a tiny array of paras (no malloc()) */
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    Para simpleParas[SIMPLE_PARAS_COUNT];
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    /* fields for line reordering */
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    int32_t 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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    /* maximum or current nesting depth of isolate sequences */
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    /* Within resolveExplicitLevels() and checkExplicitLevels(), this is the maximal
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       nesting encountered.
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       Within resolveImplicitLevels(), this is the index of the current isolates
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       stack entry. */
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    int32_t isolateCount;
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    Isolate *isolates;
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    /* for simple text, have a small stack (no malloc()) */
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    Isolate simpleIsolates[SIMPLE_ISOLATES_COUNT];
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    /* for inverse Bidi with insertion of directional marks */
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    InsertPoints insertPoints;
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    /* for option UBIDI_OPTION_REMOVE_CONTROLS */
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    int32_t controlCount;
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    /* for Bidi class callback */
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    UBiDiClassCallback *fnClassCallback;    /* action pointer */
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    const void *coClassCallback;            /* context pointer */
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};
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#define IS_VALID_PARA(x) ((x) && ((x)->pParaBiDi==(x)))
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#define IS_VALID_PARA_OR_LINE(x) ((x) && ((x)->pParaBiDi==(x) || (((x)->pParaBiDi) && (x)->pParaBiDi->pParaBiDi==(x)->pParaBiDi)))
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typedef union {
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    DirProp *dirPropsMemory;
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    UBiDiLevel *levelsMemory;
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    Opening *openingsMemory;
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    Para *parasMemory;
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    Run *runsMemory;
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    Isolate *isolatesMemory;
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} BidiMemoryForAllocation;
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/* Macros for initial checks at function entry */
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#define RETURN_IF_NULL_OR_FAILING_ERRCODE(pErrcode, retvalue) UPRV_BLOCK_MACRO_BEGIN { \
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						|
    if((pErrcode)==NULL || U_FAILURE(*pErrcode)) return retvalue; \
 | 
						|
} UPRV_BLOCK_MACRO_END
 | 
						|
#define RETURN_IF_NOT_VALID_PARA(bidi, errcode, retvalue) UPRV_BLOCK_MACRO_BEGIN { \
 | 
						|
    if(!IS_VALID_PARA(bidi)) { \
 | 
						|
        errcode=U_INVALID_STATE_ERROR; \
 | 
						|
        return retvalue; \
 | 
						|
    } \
 | 
						|
} UPRV_BLOCK_MACRO_END
 | 
						|
#define RETURN_IF_NOT_VALID_PARA_OR_LINE(bidi, errcode, retvalue) UPRV_BLOCK_MACRO_BEGIN { \
 | 
						|
    if(!IS_VALID_PARA_OR_LINE(bidi)) { \
 | 
						|
        errcode=U_INVALID_STATE_ERROR; \
 | 
						|
        return retvalue; \
 | 
						|
    } \
 | 
						|
} UPRV_BLOCK_MACRO_END
 | 
						|
#define RETURN_IF_BAD_RANGE(arg, start, limit, errcode, retvalue) UPRV_BLOCK_MACRO_BEGIN { \
 | 
						|
    if((arg)<(start) || (arg)>=(limit)) { \
 | 
						|
        (errcode)=U_ILLEGAL_ARGUMENT_ERROR; \
 | 
						|
        return retvalue; \
 | 
						|
    } \
 | 
						|
} UPRV_BLOCK_MACRO_END
 | 
						|
 | 
						|
#define RETURN_VOID_IF_NULL_OR_FAILING_ERRCODE(pErrcode) UPRV_BLOCK_MACRO_BEGIN { \
 | 
						|
    if((pErrcode)==NULL || U_FAILURE(*pErrcode)) return; \
 | 
						|
} UPRV_BLOCK_MACRO_END
 | 
						|
#define RETURN_VOID_IF_NOT_VALID_PARA(bidi, errcode) UPRV_BLOCK_MACRO_BEGIN { \
 | 
						|
    if(!IS_VALID_PARA(bidi)) { \
 | 
						|
        errcode=U_INVALID_STATE_ERROR; \
 | 
						|
        return; \
 | 
						|
    } \
 | 
						|
} UPRV_BLOCK_MACRO_END
 | 
						|
#define RETURN_VOID_IF_NOT_VALID_PARA_OR_LINE(bidi, errcode) UPRV_BLOCK_MACRO_BEGIN { \
 | 
						|
    if(!IS_VALID_PARA_OR_LINE(bidi)) { \
 | 
						|
        errcode=U_INVALID_STATE_ERROR; \
 | 
						|
        return; \
 | 
						|
    } \
 | 
						|
} UPRV_BLOCK_MACRO_END
 | 
						|
#define RETURN_VOID_IF_BAD_RANGE(arg, start, limit, errcode) UPRV_BLOCK_MACRO_BEGIN { \
 | 
						|
    if((arg)<(start) || (arg)>=(limit)) { \
 | 
						|
        (errcode)=U_ILLEGAL_ARGUMENT_ERROR; \
 | 
						|
        return; \
 | 
						|
    } \
 | 
						|
} UPRV_BLOCK_MACRO_END
 | 
						|
 | 
						|
/* helper function to (re)allocate memory if allowed */
 | 
						|
U_CFUNC UBool
 | 
						|
ubidi_getMemory(BidiMemoryForAllocation *pMemory, int32_t *pSize, UBool mayAllocate, int32_t sizeNeeded);
 | 
						|
 | 
						|
/* helper macros for each allocated array in UBiDi */
 | 
						|
#define getDirPropsMemory(pBiDi, length) \
 | 
						|
        ubidi_getMemory((BidiMemoryForAllocation *)&(pBiDi)->dirPropsMemory, &(pBiDi)->dirPropsSize, \
 | 
						|
                        (pBiDi)->mayAllocateText, (length))
 | 
						|
 | 
						|
#define getLevelsMemory(pBiDi, length) \
 | 
						|
        ubidi_getMemory((BidiMemoryForAllocation *)&(pBiDi)->levelsMemory, &(pBiDi)->levelsSize, \
 | 
						|
                        (pBiDi)->mayAllocateText, (length))
 | 
						|
 | 
						|
#define getRunsMemory(pBiDi, length) \
 | 
						|
        ubidi_getMemory((BidiMemoryForAllocation *)&(pBiDi)->runsMemory, &(pBiDi)->runsSize, \
 | 
						|
                        (pBiDi)->mayAllocateRuns, (length)*sizeof(Run))
 | 
						|
 | 
						|
/* additional macros used by ubidi_open() - always allow allocation */
 | 
						|
#define getInitialDirPropsMemory(pBiDi, length) \
 | 
						|
        ubidi_getMemory((BidiMemoryForAllocation *)&(pBiDi)->dirPropsMemory, &(pBiDi)->dirPropsSize, \
 | 
						|
                        true, (length))
 | 
						|
 | 
						|
#define getInitialLevelsMemory(pBiDi, length) \
 | 
						|
        ubidi_getMemory((BidiMemoryForAllocation *)&(pBiDi)->levelsMemory, &(pBiDi)->levelsSize, \
 | 
						|
                        true, (length))
 | 
						|
 | 
						|
#define getInitialOpeningsMemory(pBiDi, length) \
 | 
						|
        ubidi_getMemory((BidiMemoryForAllocation *)&(pBiDi)->openingsMemory, &(pBiDi)->openingsSize, \
 | 
						|
                        true, (length)*sizeof(Opening))
 | 
						|
 | 
						|
#define getInitialParasMemory(pBiDi, length) \
 | 
						|
        ubidi_getMemory((BidiMemoryForAllocation *)&(pBiDi)->parasMemory, &(pBiDi)->parasSize, \
 | 
						|
                        true, (length)*sizeof(Para))
 | 
						|
 | 
						|
#define getInitialRunsMemory(pBiDi, length) \
 | 
						|
        ubidi_getMemory((BidiMemoryForAllocation *)&(pBiDi)->runsMemory, &(pBiDi)->runsSize, \
 | 
						|
                        true, (length)*sizeof(Run))
 | 
						|
 | 
						|
#define getInitialIsolatesMemory(pBiDi, length) \
 | 
						|
        ubidi_getMemory((BidiMemoryForAllocation *)&(pBiDi)->isolatesMemory, &(pBiDi)->isolatesSize, \
 | 
						|
                        true, (length)*sizeof(Isolate))
 | 
						|
 | 
						|
#endif
 |