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/*
*******************************************************************************
*
* Copyright (C) 2004-2010, 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 "umutex.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.c is machine-generated by genbidi --csource */
#include "ubidi_props_data.c"
/* 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);
}
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