| /* |
| ******************************************************************************* |
| * |
| * Copyright (C) 2004-2012, International Business Machines |
| * Corporation and others. All Rights Reserved. |
| * |
| ******************************************************************************* |
| * file name: ubidi_props.c |
| * encoding: US-ASCII |
| * tab size: 8 (not used) |
| * indentation:4 |
| * |
| * created on: 2004dec30 |
| * created by: Markus W. Scherer |
| * |
| * Low-level Unicode bidi/shaping properties access. |
| */ |
| |
| #include "unicode/utypes.h" |
| #include "unicode/uset.h" |
| #include "unicode/udata.h" /* UDataInfo */ |
| #include "ucmndata.h" /* DataHeader */ |
| #include "udatamem.h" |
| #include "uassert.h" |
| #include "cmemory.h" |
| #include "utrie2.h" |
| #include "ubidi_props.h" |
| #include "ucln_cmn.h" |
| |
| struct UBiDiProps { |
| UDataMemory *mem; |
| const int32_t *indexes; |
| const uint32_t *mirrors; |
| const uint8_t *jgArray; |
| |
| UTrie2 trie; |
| uint8_t formatVersion[4]; |
| }; |
| |
| /* ubidi_props_data.h is machine-generated by genbidi --csource */ |
| #define INCLUDED_FROM_UBIDI_PROPS_C |
| #include "ubidi_props_data.h" |
| |
| /* UBiDiProps singleton ----------------------------------------------------- */ |
| |
| U_CFUNC const UBiDiProps * |
| ubidi_getSingleton() { |
| return &ubidi_props_singleton; |
| } |
| |
| /* set of property starts for UnicodeSet ------------------------------------ */ |
| |
| static UBool U_CALLCONV |
| _enumPropertyStartsRange(const void *context, UChar32 start, UChar32 end, uint32_t value) { |
| /* add the start code point to the USet */ |
| const USetAdder *sa=(const USetAdder *)context; |
| sa->add(sa->set, start); |
| return TRUE; |
| } |
| |
| U_CFUNC void |
| ubidi_addPropertyStarts(const UBiDiProps *bdp, const USetAdder *sa, UErrorCode *pErrorCode) { |
| int32_t i, length; |
| UChar32 c, start, limit; |
| |
| const uint8_t *jgArray; |
| uint8_t prev, jg; |
| |
| if(U_FAILURE(*pErrorCode)) { |
| return; |
| } |
| |
| /* add the start code point of each same-value range of the trie */ |
| utrie2_enum(&bdp->trie, NULL, _enumPropertyStartsRange, sa); |
| |
| /* add the code points from the bidi mirroring table */ |
| length=bdp->indexes[UBIDI_IX_MIRROR_LENGTH]; |
| for(i=0; i<length; ++i) { |
| c=UBIDI_GET_MIRROR_CODE_POINT(bdp->mirrors[i]); |
| sa->addRange(sa->set, c, c+1); |
| } |
| |
| /* add the code points from the Joining_Group array where the value changes */ |
| start=bdp->indexes[UBIDI_IX_JG_START]; |
| limit=bdp->indexes[UBIDI_IX_JG_LIMIT]; |
| jgArray=bdp->jgArray; |
| prev=0; |
| while(start<limit) { |
| jg=*jgArray++; |
| if(jg!=prev) { |
| sa->add(sa->set, start); |
| prev=jg; |
| } |
| ++start; |
| } |
| if(prev!=0) { |
| /* add the limit code point if the last value was not 0 (it is now start==limit) */ |
| sa->add(sa->set, limit); |
| } |
| |
| /* add code points with hardcoded properties, plus the ones following them */ |
| |
| /* (none right now) */ |
| } |
| |
| /* property access functions ------------------------------------------------ */ |
| |
| U_CFUNC int32_t |
| ubidi_getMaxValue(const UBiDiProps *bdp, UProperty which) { |
| int32_t max; |
| |
| if(bdp==NULL) { |
| return -1; |
| } |
| |
| max=bdp->indexes[UBIDI_MAX_VALUES_INDEX]; |
| switch(which) { |
| case UCHAR_BIDI_CLASS: |
| return (max&UBIDI_CLASS_MASK); |
| case UCHAR_JOINING_GROUP: |
| return (max&UBIDI_MAX_JG_MASK)>>UBIDI_MAX_JG_SHIFT; |
| case UCHAR_JOINING_TYPE: |
| return (max&UBIDI_JT_MASK)>>UBIDI_JT_SHIFT; |
| default: |
| return -1; /* undefined */ |
| } |
| } |
| |
| U_CAPI UCharDirection |
| ubidi_getClass(const UBiDiProps *bdp, UChar32 c) { |
| uint16_t props=UTRIE2_GET16(&bdp->trie, c); |
| return (UCharDirection)UBIDI_GET_CLASS(props); |
| } |
| |
| U_CFUNC UBool |
| ubidi_isMirrored(const UBiDiProps *bdp, UChar32 c) { |
| uint16_t props=UTRIE2_GET16(&bdp->trie, c); |
| return (UBool)UBIDI_GET_FLAG(props, UBIDI_IS_MIRRORED_SHIFT); |
| } |
| |
| U_CFUNC UChar32 |
| ubidi_getMirror(const UBiDiProps *bdp, UChar32 c) { |
| uint16_t props=UTRIE2_GET16(&bdp->trie, c); |
| int32_t delta=((int16_t)props)>>UBIDI_MIRROR_DELTA_SHIFT; |
| if(delta!=UBIDI_ESC_MIRROR_DELTA) { |
| return c+delta; |
| } else { |
| /* look for mirror code point in the mirrors[] table */ |
| const uint32_t *mirrors; |
| uint32_t m; |
| int32_t i, length; |
| UChar32 c2; |
| |
| mirrors=bdp->mirrors; |
| length=bdp->indexes[UBIDI_IX_MIRROR_LENGTH]; |
| |
| /* linear search */ |
| for(i=0; i<length; ++i) { |
| m=mirrors[i]; |
| c2=UBIDI_GET_MIRROR_CODE_POINT(m); |
| if(c==c2) { |
| /* found c, return its mirror code point using the index in m */ |
| return UBIDI_GET_MIRROR_CODE_POINT(mirrors[UBIDI_GET_MIRROR_INDEX(m)]); |
| } else if(c<c2) { |
| break; |
| } |
| } |
| |
| /* c not found, return it itself */ |
| return c; |
| } |
| } |
| |
| U_CFUNC UBool |
| ubidi_isBidiControl(const UBiDiProps *bdp, UChar32 c) { |
| uint16_t props=UTRIE2_GET16(&bdp->trie, c); |
| return (UBool)UBIDI_GET_FLAG(props, UBIDI_BIDI_CONTROL_SHIFT); |
| } |
| |
| U_CFUNC UBool |
| ubidi_isJoinControl(const UBiDiProps *bdp, UChar32 c) { |
| uint16_t props=UTRIE2_GET16(&bdp->trie, c); |
| return (UBool)UBIDI_GET_FLAG(props, UBIDI_JOIN_CONTROL_SHIFT); |
| } |
| |
| U_CFUNC UJoiningType |
| ubidi_getJoiningType(const UBiDiProps *bdp, UChar32 c) { |
| uint16_t props=UTRIE2_GET16(&bdp->trie, c); |
| return (UJoiningType)((props&UBIDI_JT_MASK)>>UBIDI_JT_SHIFT); |
| } |
| |
| U_CFUNC UJoiningGroup |
| ubidi_getJoiningGroup(const UBiDiProps *bdp, UChar32 c) { |
| UChar32 start, limit; |
| |
| start=bdp->indexes[UBIDI_IX_JG_START]; |
| limit=bdp->indexes[UBIDI_IX_JG_LIMIT]; |
| if(start<=c && c<limit) { |
| return (UJoiningGroup)bdp->jgArray[c-start]; |
| } else { |
| return U_JG_NO_JOINING_GROUP; |
| } |
| } |
| |
| /* public API (see uchar.h) ------------------------------------------------- */ |
| |
| U_CFUNC UCharDirection |
| u_charDirection(UChar32 c) { |
| return ubidi_getClass(&ubidi_props_singleton, c); |
| } |
| |
| U_CFUNC UBool |
| u_isMirrored(UChar32 c) { |
| return ubidi_isMirrored(&ubidi_props_singleton, c); |
| } |
| |
| U_CFUNC UChar32 |
| u_charMirror(UChar32 c) { |
| return ubidi_getMirror(&ubidi_props_singleton, c); |
| } |