254 lines
7.3 KiB
C++
254 lines
7.3 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) 2004-2014, 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_props.c
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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: 2004dec30
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* created by: Markus W. Scherer
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*
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* Low-level Unicode bidi/shaping properties access.
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*/
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#include "unicode/utypes.h"
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#include "unicode/uset.h"
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#include "unicode/udata.h" /* UDataInfo */
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#include "ucmndata.h" /* DataHeader */
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#include "udatamem.h"
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#include "uassert.h"
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#include "cmemory.h"
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#include "utrie2.h"
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#include "ubidi_props.h"
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#include "ucln_cmn.h"
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struct UBiDiProps {
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UDataMemory *mem;
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const int32_t *indexes;
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const uint32_t *mirrors;
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const uint8_t *jgArray;
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const uint8_t *jgArray2;
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UTrie2 trie;
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uint8_t formatVersion[4];
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};
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/* ubidi_props_data.h is machine-generated by genbidi --csource */
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#define INCLUDED_FROM_UBIDI_PROPS_C
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#include "ubidi_props_data.h"
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/* set of property starts for UnicodeSet ------------------------------------ */
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static UBool U_CALLCONV
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_enumPropertyStartsRange(const void *context, UChar32 start, UChar32 end, uint32_t value) {
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(void)end;
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(void)value;
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/* add the start code point to the USet */
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const USetAdder *sa=(const USetAdder *)context;
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sa->add(sa->set, start);
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return TRUE;
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}
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U_CFUNC void
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ubidi_addPropertyStarts(const USetAdder *sa, UErrorCode *pErrorCode) {
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int32_t i, length;
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UChar32 c, start, limit;
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const uint8_t *jgArray;
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uint8_t prev, jg;
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if(U_FAILURE(*pErrorCode)) {
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return;
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}
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/* add the start code point of each same-value range of the trie */
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utrie2_enum(&ubidi_props_singleton.trie, NULL, _enumPropertyStartsRange, sa);
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/* add the code points from the bidi mirroring table */
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length=ubidi_props_singleton.indexes[UBIDI_IX_MIRROR_LENGTH];
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for(i=0; i<length; ++i) {
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c=UBIDI_GET_MIRROR_CODE_POINT(ubidi_props_singleton.mirrors[i]);
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sa->addRange(sa->set, c, c+1);
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}
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/* add the code points from the Joining_Group array where the value changes */
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start=ubidi_props_singleton.indexes[UBIDI_IX_JG_START];
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limit=ubidi_props_singleton.indexes[UBIDI_IX_JG_LIMIT];
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jgArray=ubidi_props_singleton.jgArray;
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for(;;) {
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prev=0;
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while(start<limit) {
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jg=*jgArray++;
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if(jg!=prev) {
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sa->add(sa->set, start);
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prev=jg;
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}
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++start;
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}
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if(prev!=0) {
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/* add the limit code point if the last value was not 0 (it is now start==limit) */
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sa->add(sa->set, limit);
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}
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if(limit==ubidi_props_singleton.indexes[UBIDI_IX_JG_LIMIT]) {
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/* switch to the second Joining_Group range */
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start=ubidi_props_singleton.indexes[UBIDI_IX_JG_START2];
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limit=ubidi_props_singleton.indexes[UBIDI_IX_JG_LIMIT2];
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jgArray=ubidi_props_singleton.jgArray2;
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} else {
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break;
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}
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}
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/* add code points with hardcoded properties, plus the ones following them */
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/* (none right now) */
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}
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/* property access functions ------------------------------------------------ */
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U_CFUNC int32_t
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ubidi_getMaxValue(UProperty which) {
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int32_t max=ubidi_props_singleton.indexes[UBIDI_MAX_VALUES_INDEX];
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switch(which) {
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case UCHAR_BIDI_CLASS:
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return (max&UBIDI_CLASS_MASK);
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case UCHAR_JOINING_GROUP:
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return (max&UBIDI_MAX_JG_MASK)>>UBIDI_MAX_JG_SHIFT;
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case UCHAR_JOINING_TYPE:
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return (max&UBIDI_JT_MASK)>>UBIDI_JT_SHIFT;
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case UCHAR_BIDI_PAIRED_BRACKET_TYPE:
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return (max&UBIDI_BPT_MASK)>>UBIDI_BPT_SHIFT;
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default:
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return -1; /* undefined */
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}
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}
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U_CAPI UCharDirection
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ubidi_getClass(UChar32 c) {
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uint16_t props=UTRIE2_GET16(&ubidi_props_singleton.trie, c);
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return (UCharDirection)UBIDI_GET_CLASS(props);
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}
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U_CFUNC UBool
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ubidi_isMirrored(UChar32 c) {
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uint16_t props=UTRIE2_GET16(&ubidi_props_singleton.trie, c);
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return (UBool)UBIDI_GET_FLAG(props, UBIDI_IS_MIRRORED_SHIFT);
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}
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static UChar32
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getMirror(UChar32 c, uint16_t props) {
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int32_t delta=UBIDI_GET_MIRROR_DELTA(props);
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if(delta!=UBIDI_ESC_MIRROR_DELTA) {
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return c+delta;
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} else {
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/* look for mirror code point in the mirrors[] table */
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const uint32_t *mirrors;
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uint32_t m;
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int32_t i, length;
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UChar32 c2;
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mirrors=ubidi_props_singleton.mirrors;
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length=ubidi_props_singleton.indexes[UBIDI_IX_MIRROR_LENGTH];
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/* linear search */
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for(i=0; i<length; ++i) {
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m=mirrors[i];
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c2=UBIDI_GET_MIRROR_CODE_POINT(m);
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if(c==c2) {
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/* found c, return its mirror code point using the index in m */
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return UBIDI_GET_MIRROR_CODE_POINT(mirrors[UBIDI_GET_MIRROR_INDEX(m)]);
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} else if(c<c2) {
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break;
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}
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}
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/* c not found, return it itself */
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return c;
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}
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}
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U_CFUNC UChar32
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ubidi_getMirror(UChar32 c) {
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uint16_t props=UTRIE2_GET16(&ubidi_props_singleton.trie, c);
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return getMirror(c, props);
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}
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U_CFUNC UBool
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ubidi_isBidiControl(UChar32 c) {
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uint16_t props=UTRIE2_GET16(&ubidi_props_singleton.trie, c);
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return (UBool)UBIDI_GET_FLAG(props, UBIDI_BIDI_CONTROL_SHIFT);
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}
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U_CFUNC UBool
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ubidi_isJoinControl(UChar32 c) {
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uint16_t props=UTRIE2_GET16(&ubidi_props_singleton.trie, c);
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return (UBool)UBIDI_GET_FLAG(props, UBIDI_JOIN_CONTROL_SHIFT);
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}
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U_CFUNC UJoiningType
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ubidi_getJoiningType(UChar32 c) {
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uint16_t props=UTRIE2_GET16(&ubidi_props_singleton.trie, c);
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return (UJoiningType)((props&UBIDI_JT_MASK)>>UBIDI_JT_SHIFT);
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}
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U_CFUNC UJoiningGroup
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ubidi_getJoiningGroup(UChar32 c) {
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UChar32 start, limit;
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start=ubidi_props_singleton.indexes[UBIDI_IX_JG_START];
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limit=ubidi_props_singleton.indexes[UBIDI_IX_JG_LIMIT];
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if(start<=c && c<limit) {
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return (UJoiningGroup)ubidi_props_singleton.jgArray[c-start];
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}
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start=ubidi_props_singleton.indexes[UBIDI_IX_JG_START2];
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limit=ubidi_props_singleton.indexes[UBIDI_IX_JG_LIMIT2];
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if(start<=c && c<limit) {
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return (UJoiningGroup)ubidi_props_singleton.jgArray2[c-start];
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}
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return U_JG_NO_JOINING_GROUP;
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}
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U_CFUNC UBidiPairedBracketType
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ubidi_getPairedBracketType(UChar32 c) {
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uint16_t props=UTRIE2_GET16(&ubidi_props_singleton.trie, c);
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return (UBidiPairedBracketType)((props&UBIDI_BPT_MASK)>>UBIDI_BPT_SHIFT);
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}
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U_CFUNC UChar32
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ubidi_getPairedBracket(UChar32 c) {
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uint16_t props=UTRIE2_GET16(&ubidi_props_singleton.trie, c);
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if((props&UBIDI_BPT_MASK)==0) {
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return c;
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} else {
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return getMirror(c, props);
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}
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}
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/* public API (see uchar.h) ------------------------------------------------- */
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U_CFUNC UCharDirection
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u_charDirection(UChar32 c) {
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return ubidi_getClass(c);
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}
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U_CFUNC UBool
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u_isMirrored(UChar32 c) {
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return ubidi_isMirrored(c);
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}
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U_CFUNC UChar32
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u_charMirror(UChar32 c) {
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return ubidi_getMirror(c);
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}
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U_CAPI UChar32 U_EXPORT2
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u_getBidiPairedBracket(UChar32 c) {
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return ubidi_getPairedBracket(c);
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}
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