blob: e48fc6f941621b7fb61b6c6cbe423f24021f54a9 [file] [log] [blame]
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
******************************************************************************
*
* Copyright (C) 1999-2016, International Business Machines
* Corporation and others. All Rights Reserved.
*
******************************************************************************
* file name: ubidiimp.h
* encoding: UTF-8
* tab size: 8 (not used)
* indentation:4
*
* created on: 1999aug06
* created by: Markus W. Scherer, updated by Matitiahu Allouche
*/
#ifndef UBIDIIMP_H
#define UBIDIIMP_H
#include "unicode/utypes.h"
#include "unicode/ubidi.h"
#include "unicode/uchar.h"
#include "ubidi_props.h"
/* miscellaneous definitions ---------------------------------------------- */
// ICU-20853=ICU-20935 Solaris #defines CS and ES in sys/regset.h
#ifdef CS
# undef CS
#endif
#ifdef ES
# undef ES
#endif
typedef uint8_t DirProp;
typedef uint32_t Flags;
/* Comparing the description of the BiDi algorithm with this implementation
is easier with the same names for the BiDi types in the code as there.
See UCharDirection in uchar.h .
*/
enum {
L= U_LEFT_TO_RIGHT, /* 0 */
R= U_RIGHT_TO_LEFT, /* 1 */
EN= U_EUROPEAN_NUMBER, /* 2 */
ES= U_EUROPEAN_NUMBER_SEPARATOR, /* 3 */
ET= U_EUROPEAN_NUMBER_TERMINATOR, /* 4 */
AN= U_ARABIC_NUMBER, /* 5 */
CS= U_COMMON_NUMBER_SEPARATOR, /* 6 */
B= U_BLOCK_SEPARATOR, /* 7 */
S= U_SEGMENT_SEPARATOR, /* 8 */
WS= U_WHITE_SPACE_NEUTRAL, /* 9 */
ON= U_OTHER_NEUTRAL, /* 10 */
LRE=U_LEFT_TO_RIGHT_EMBEDDING, /* 11 */
LRO=U_LEFT_TO_RIGHT_OVERRIDE, /* 12 */
AL= U_RIGHT_TO_LEFT_ARABIC, /* 13 */
RLE=U_RIGHT_TO_LEFT_EMBEDDING, /* 14 */
RLO=U_RIGHT_TO_LEFT_OVERRIDE, /* 15 */
PDF=U_POP_DIRECTIONAL_FORMAT, /* 16 */
NSM=U_DIR_NON_SPACING_MARK, /* 17 */
BN= U_BOUNDARY_NEUTRAL, /* 18 */
FSI=U_FIRST_STRONG_ISOLATE, /* 19 */
LRI=U_LEFT_TO_RIGHT_ISOLATE, /* 20 */
RLI=U_RIGHT_TO_LEFT_ISOLATE, /* 21 */
PDI=U_POP_DIRECTIONAL_ISOLATE, /* 22 */
ENL, /* EN after W7 */ /* 23 */
ENR, /* EN not subject to W7 */ /* 24 */
dirPropCount
};
/* Sometimes, bit values are more appropriate
to deal with directionality properties.
Abbreviations in these macro names refer to names
used in the BiDi algorithm.
*/
#define DIRPROP_FLAG(dir) (1UL<<(dir))
#define PURE_DIRPROP(prop) ((prop)&~0xE0) ?????????????????????????
/* special flag for multiple runs from explicit embedding codes */
#define DIRPROP_FLAG_MULTI_RUNS (1UL<<31)
/* are there any characters that are LTR or RTL? */
#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))
#define MASK_RTL (DIRPROP_FLAG(R)|DIRPROP_FLAG(AL)|DIRPROP_FLAG(RLE)|DIRPROP_FLAG(RLO)|DIRPROP_FLAG(RLI))
#define MASK_R_AL (DIRPROP_FLAG(R)|DIRPROP_FLAG(AL))
#define MASK_STRONG_EN_AN (DIRPROP_FLAG(L)|DIRPROP_FLAG(R)|DIRPROP_FLAG(AL)|DIRPROP_FLAG(EN)|DIRPROP_FLAG(AN))
/* explicit embedding codes */
#define MASK_EXPLICIT (DIRPROP_FLAG(LRE)|DIRPROP_FLAG(LRO)|DIRPROP_FLAG(RLE)|DIRPROP_FLAG(RLO)|DIRPROP_FLAG(PDF))
/* explicit isolate codes */
#define MASK_ISO (DIRPROP_FLAG(LRI)|DIRPROP_FLAG(RLI)|DIRPROP_FLAG(FSI)|DIRPROP_FLAG(PDI))
#define MASK_BN_EXPLICIT (DIRPROP_FLAG(BN)|MASK_EXPLICIT)
/* paragraph and segment separators */
#define MASK_B_S (DIRPROP_FLAG(B)|DIRPROP_FLAG(S))
/* all types that are counted as White Space or Neutral in some steps */
#define MASK_WS (MASK_B_S|DIRPROP_FLAG(WS)|MASK_BN_EXPLICIT|MASK_ISO)
/* types that are neutrals or could becomes neutrals in (Wn) */
#define MASK_POSSIBLE_N (DIRPROP_FLAG(ON)|DIRPROP_FLAG(CS)|DIRPROP_FLAG(ES)|DIRPROP_FLAG(ET)|MASK_WS)
/*
* These types may be changed to "e",
* the embedding type (L or R) of the run,
* in the BiDi algorithm (N2)
*/
#define MASK_EMBEDDING (DIRPROP_FLAG(NSM)|MASK_POSSIBLE_N)
/* the dirProp's L and R are defined to 0 and 1 values in UCharDirection */
#define GET_LR_FROM_LEVEL(level) ((DirProp)((level)&1))
#define IS_DEFAULT_LEVEL(level) ((level)>=0xfe)
/*
* The following bit is used for the directional isolate status.
* Stack entries corresponding to isolate sequences are greater than ISOLATE.
*/
#define ISOLATE 0x0100
U_CFUNC UBiDiLevel
ubidi_getParaLevelAtIndex(const UBiDi *pBiDi, int32_t index);
#define GET_PARALEVEL(ubidi, index) \
((UBiDiLevel)(!(ubidi)->defaultParaLevel || (index)<(ubidi)->paras[0].limit ? \
(ubidi)->paraLevel : ubidi_getParaLevelAtIndex((ubidi), (index))))
/* number of paras entries allocated initially without malloc */
#define SIMPLE_PARAS_COUNT 10
/* number of isolate entries allocated initially without malloc */
#define SIMPLE_ISOLATES_COUNT 5
/* number of isolate run entries for paired brackets allocated initially without malloc */
#define SIMPLE_OPENINGS_COUNT 20
#define CR 0x000D
#define LF 0x000A
/* Run structure for reordering --------------------------------------------- */
enum {
LRM_BEFORE=1,
LRM_AFTER=2,
RLM_BEFORE=4,
RLM_AFTER=8
};
typedef struct Para {
int32_t limit;
int32_t level;
} Para;
enum { /* flags for Opening.flags */
FOUND_L=DIRPROP_FLAG(L),
FOUND_R=DIRPROP_FLAG(R)
};
typedef struct Opening {
int32_t position; /* position of opening bracket */
int32_t match; /* matching char or -position of closing bracket */
int32_t contextPos; /* position of last strong char found before opening */
uint16_t flags; /* bits for L or R/AL found within the pair */
UBiDiDirection contextDir; /* L or R according to last strong char before opening */
uint8_t filler; /* to complete a nice multiple of 4 chars */
} Opening;
typedef struct IsoRun {
int32_t contextPos; /* position of char determining context */
uint16_t start; /* index of first opening entry for this run */
uint16_t limit; /* index after last opening entry for this run */
UBiDiLevel level; /* level of this run */
DirProp lastStrong; /* bidi class of last strong char found in this run */
DirProp lastBase; /* bidi class of last base char found in this run */
UBiDiDirection contextDir; /* L or R to use as context for following openings */
} IsoRun;
typedef struct BracketData {
UBiDi *pBiDi;
/* array of opening entries which should be enough in most cases; no malloc() */
Opening simpleOpenings[SIMPLE_OPENINGS_COUNT];
Opening *openings; /* pointer to current array of entries */
int32_t openingsCount; /* number of allocated entries */
int32_t isoRunLast; /* index of last used entry */
/* array of nested isolated sequence entries; can never excess UBIDI_MAX_EXPLICIT_LEVEL
+ 1 for index 0, + 1 for before the first isolated sequence */
IsoRun isoRuns[UBIDI_MAX_EXPLICIT_LEVEL+2];
UBool isNumbersSpecial; /* reordering mode for NUMBERS_SPECIAL */
} BracketData;
typedef struct Isolate {
int32_t startON;
int32_t start1;
int32_t state;
int16_t stateImp;
} Isolate;
typedef struct Run {
int32_t logicalStart, /* first character of the run; b31 indicates even/odd level */
visualLimit, /* last visual position of the run +1 */
insertRemove; /* if >0, flags for inserting LRM/RLM before/after run,
if <0, count of bidi controls within run */
} Run;
/* in a Run, logicalStart will get this bit set if the run level is odd */
#define INDEX_ODD_BIT (1UL<<31)
#define MAKE_INDEX_ODD_PAIR(index, level) ((index)|((int32_t)((level)&1)<<31))
#define ADD_ODD_BIT_FROM_LEVEL(x, level) ((x)|=((int32_t)((level)&1)<<31))
#define REMOVE_ODD_BIT(x) ((x)&=~INDEX_ODD_BIT)
#define GET_INDEX(x) ((x)&~INDEX_ODD_BIT)
#define GET_ODD_BIT(x) ((uint32_t)(x)>>31)
#define IS_ODD_RUN(x) ((UBool)(((x)&INDEX_ODD_BIT)!=0))
#define IS_EVEN_RUN(x) ((UBool)(((x)&INDEX_ODD_BIT)==0))
U_CFUNC UBool
ubidi_getRuns(UBiDi *pBiDi, UErrorCode *pErrorCode);
/** BiDi control code points */
enum {
ZWNJ_CHAR=0x200c,
ZWJ_CHAR,
LRM_CHAR,
RLM_CHAR,
LRE_CHAR=0x202a,
RLE_CHAR,
PDF_CHAR,
LRO_CHAR,
RLO_CHAR,
LRI_CHAR=0x2066,
RLI_CHAR,
FSI_CHAR,
PDI_CHAR
};
#define IS_BIDI_CONTROL_CHAR(c) (((uint32_t)(c)&0xfffffffc)==ZWNJ_CHAR || (uint32_t)((c)-LRE_CHAR)<5 || (uint32_t)((c)-LRI_CHAR)<4)
/* InsertPoints structure for noting where to put BiDi marks ---------------- */
typedef struct Point {
int32_t pos; /* position in text */
int32_t flag; /* flag for LRM/RLM, before/after */
} Point;
typedef struct InsertPoints {
int32_t capacity; /* number of points allocated */
int32_t size; /* number of points used */
int32_t confirmed; /* number of points confirmed */
UErrorCode errorCode; /* for eventual memory shortage */
Point *points; /* pointer to array of points */
} InsertPoints;
/* UBiDi structure ----------------------------------------------------------- */
struct UBiDi {
/* pointer to parent paragraph object (pointer to self if this object is
* a paragraph object); set to NULL in a newly opened object; set to a
* real value after a successful execution of ubidi_setPara or ubidi_setLine
*/
const UBiDi * pParaBiDi;
/* alias pointer to the current text */
const UChar *text;
/* length of the current text */
int32_t originalLength;
/* if the UBIDI_OPTION_STREAMING option is set, this is the length
* of text actually processed by ubidi_setPara, which may be shorter than
* the original length.
* Otherwise, it is identical to the original length.
*/
int32_t length;
/* if the UBIDI_OPTION_REMOVE_CONTROLS option is set, and/or
* marks are allowed to be inserted in one of the reordering mode, the
* length of the result string may be different from the processed length.
*/
int32_t resultLength;
/* memory sizes in bytes */
int32_t dirPropsSize, levelsSize, openingsSize, parasSize, runsSize, isolatesSize;
/* allocated memory */
DirProp *dirPropsMemory;
UBiDiLevel *levelsMemory;
Opening *openingsMemory;
Para *parasMemory;
Run *runsMemory;
Isolate *isolatesMemory;
/* indicators for whether memory may be allocated after ubidi_open() */
UBool mayAllocateText, mayAllocateRuns;
/* arrays with one value per text-character */
DirProp *dirProps;
UBiDiLevel *levels;
/* are we performing an approximation of the "inverse BiDi" algorithm? */
UBool isInverse;
/* are we using the basic algorithm or its variation? */
UBiDiReorderingMode reorderingMode;
/* UBIDI_REORDER_xxx values must be ordered so that all the regular
* logical to visual modes come first, and all inverse BiDi modes
* come last.
*/
#define UBIDI_REORDER_LAST_LOGICAL_TO_VISUAL UBIDI_REORDER_NUMBERS_SPECIAL
/* bitmask for reordering options */
uint32_t reorderingOptions;
/* must block separators receive level 0? */
UBool orderParagraphsLTR;
/* the paragraph level */
UBiDiLevel paraLevel;
/* original paraLevel when contextual */
/* must be one of UBIDI_DEFAULT_xxx or 0 if not contextual */
UBiDiLevel defaultParaLevel;
/* context data */
const UChar *prologue;
int32_t proLength;
const UChar *epilogue;
int32_t epiLength;
/* the following is set in ubidi_setPara, used in processPropertySeq */
const struct ImpTabPair * pImpTabPair; /* pointer to levels state table pair */
/* the overall paragraph or line directionality - see UBiDiDirection */
UBiDiDirection direction;
/* flags is a bit set for which directional properties are in the text */
Flags flags;
/* lastArabicPos is index to the last AL in the text, -1 if none */
int32_t lastArabicPos;
/* characters after trailingWSStart are WS and are */
/* implicitly at the paraLevel (rule (L1)) - levels may not reflect that */
int32_t trailingWSStart;
/* fields for paragraph handling */
int32_t paraCount; /* set in getDirProps() */
/* filled in getDirProps() */
Para *paras;
/* for relatively short text, we only need a tiny array of paras (no malloc()) */
Para simpleParas[SIMPLE_PARAS_COUNT];
/* fields for line reordering */
int32_t runCount; /* ==-1: runs not set up yet */
Run *runs;
/* for non-mixed text, we only need a tiny array of runs (no malloc()) */
Run simpleRuns[1];
/* maximum or current nesting depth of isolate sequences */
/* Within resolveExplicitLevels() and checkExplicitLevels(), this is the maximal
nesting encountered.
Within resolveImplicitLevels(), this is the index of the current isolates
stack entry. */
int32_t isolateCount;
Isolate *isolates;
/* for simple text, have a small stack (no malloc()) */
Isolate simpleIsolates[SIMPLE_ISOLATES_COUNT];
/* for inverse Bidi with insertion of directional marks */
InsertPoints insertPoints;
/* for option UBIDI_OPTION_REMOVE_CONTROLS */
int32_t controlCount;
/* for Bidi class callback */
UBiDiClassCallback *fnClassCallback; /* action pointer */
const void *coClassCallback; /* context pointer */
};
#define IS_VALID_PARA(x) ((x) && ((x)->pParaBiDi==(x)))
#define IS_VALID_PARA_OR_LINE(x) ((x) && ((x)->pParaBiDi==(x) || (((x)->pParaBiDi) && (x)->pParaBiDi->pParaBiDi==(x)->pParaBiDi)))
typedef union {
DirProp *dirPropsMemory;
UBiDiLevel *levelsMemory;
Opening *openingsMemory;
Para *parasMemory;
Run *runsMemory;
Isolate *isolatesMemory;
} BidiMemoryForAllocation;
/* Macros for initial checks at function entry */
#define RETURN_IF_NULL_OR_FAILING_ERRCODE(pErrcode, retvalue) UPRV_BLOCK_MACRO_BEGIN { \
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