/*
*******************************************************************************
*
* Copyright (C) 2005-2009, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
* file name: ucasemap.c
* encoding: US-ASCII
* tab size: 8 (not used)
* indentation:4
*
* created on: 2005may06
* created by: Markus W. Scherer
*
* Case mapping service object and functions using it.
*/
#include "unicode/utypes.h"
#include "unicode/uloc.h"
#include "unicode/ustring.h"
#include "unicode/ucasemap.h"
#if !UCONFIG_NO_BREAK_ITERATION
#include "unicode/ubrk.h"
#include "unicode/utext.h"
#endif
#include "cmemory.h"
#include "cstring.h"
#include "ucase.h"
#include "ustr_imp.h"
/* UCaseMap service object -------------------------------------------------- */
U_CAPI UCaseMap * U_EXPORT2
ucasemap_open(const char *locale, uint32_t options, UErrorCode *pErrorCode) {
UCaseMap *csm;
if(U_FAILURE(*pErrorCode)) {
return NULL;
}
csm=(UCaseMap *)uprv_malloc(sizeof(UCaseMap));
if(csm==NULL) {
return NULL;
}
uprv_memset(csm, 0, sizeof(UCaseMap));
csm->csp=ucase_getSingleton(pErrorCode);
ucasemap_setLocale(csm, locale, pErrorCode);
if(U_FAILURE(*pErrorCode)) {
uprv_free(csm);
return NULL;
}
csm->options=options;
return csm;
}
U_CAPI void U_EXPORT2
ucasemap_close(UCaseMap *csm) {
if(csm!=NULL) {
#if !UCONFIG_NO_BREAK_ITERATION
ubrk_close(csm->iter);
#endif
uprv_free(csm);
}
}
U_CAPI const char * U_EXPORT2
ucasemap_getLocale(const UCaseMap *csm) {
return csm->locale;
}
U_CAPI uint32_t U_EXPORT2
ucasemap_getOptions(const UCaseMap *csm) {
return csm->options;
}
U_CAPI void U_EXPORT2
ucasemap_setLocale(UCaseMap *csm, const char *locale, UErrorCode *pErrorCode) {
int32_t length;
if(U_FAILURE(*pErrorCode)) {
return;
}
length=uloc_getName(locale, csm->locale, (int32_t)sizeof(csm->locale), pErrorCode);
if(*pErrorCode==U_BUFFER_OVERFLOW_ERROR || length==sizeof(csm->locale)) {
*pErrorCode=U_ZERO_ERROR;
/* we only really need the language code for case mappings */
length=uloc_getLanguage(locale, csm->locale, (int32_t)sizeof(csm->locale), pErrorCode);
}
if(length==sizeof(csm->locale)) {
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
}
csm->locCache=0;
if(U_SUCCESS(*pErrorCode)) {
ucase_getCaseLocale(csm->locale, &csm->locCache);
} else {
csm->locale[0]=0;
}
}
U_CAPI void U_EXPORT2
ucasemap_setOptions(UCaseMap *csm, uint32_t options, UErrorCode *pErrorCode) {
csm->options=options;
}
#if !UCONFIG_NO_BREAK_ITERATION
U_CAPI const UBreakIterator * U_EXPORT2
ucasemap_getBreakIterator(const UCaseMap *csm) {
return csm->iter;
}
U_CAPI void U_EXPORT2
ucasemap_setBreakIterator(UCaseMap *csm, UBreakIterator *iterToAdopt, UErrorCode *pErrorCode) {
ubrk_close(csm->iter);
csm->iter=iterToAdopt;
}
#endif
/* UTF-8 string case mappings ----------------------------------------------- */
/* TODO(markus): Move to a new, separate utf8case.c file. */
/* append a full case mapping result, see UCASE_MAX_STRING_LENGTH */
static U_INLINE int32_t
appendResult(uint8_t *dest, int32_t destIndex, int32_t destCapacity,
int32_t result, const UChar *s) {
UChar32 c;
int32_t length, destLength;
UErrorCode errorCode;
/* decode the result */
if(result<0) {
/* (not) original code point */
c=~result;
length=-1;
} else if(result<=UCASE_MAX_STRING_LENGTH) {
c=U_SENTINEL;
length=result;
} else {
c=result;
length=-1;
}
if(destIndex<destCapacity) {
/* append the result */
if(length<0) {
/* code point */
UBool isError=FALSE;
U8_APPEND(dest, destIndex, destCapacity, c, isError);
if(isError) {
/* overflow, nothing written */
destIndex+=U8_LENGTH(c);
}
} else {
/* string */
errorCode=U_ZERO_ERROR;
u_strToUTF8(
(char *)(dest+destIndex), destCapacity-destIndex, &destLength,
s, length,
&errorCode);
destIndex+=destLength;
/* we might have an overflow, but we know the actual length */
}
} else {
/* preflight */
if(length<0) {
destIndex+=U8_LENGTH(c);
} else {
errorCode=U_ZERO_ERROR;
u_strToUTF8(
NULL, 0, &destLength,
s, length,
&errorCode);
destIndex+=destLength;
}
}
return destIndex;
}
static UChar32 U_CALLCONV
utf8_caseContextIterator(void *context, int8_t dir) {
UCaseContext *csc=(UCaseContext *)context;
UChar32 c;
if(dir<0) {
/* reset for backward iteration */
csc->index=csc->cpStart;
csc->dir=dir;
} else if(dir>0) {
/* reset for forward iteration */
csc->index=csc->cpLimit;
csc->dir=dir;
} else {
/* continue current iteration direction */
dir=csc->dir;
}
if(dir<0) {
if(csc->start<csc->index) {
U8_PREV((const uint8_t *)csc->p, csc->start, csc->index, c);
return c;
}
} else {
if(csc->index<csc->limit) {
U8_NEXT((const uint8_t *)csc->p, csc->index, csc->limit, c);
return c;
}
}
return U_SENTINEL;
}
/*
* Case-maps [srcStart..srcLimit[ but takes
* context [0..srcLength[ into account.
*/
static int32_t
_caseMap(const UCaseMap *csm, UCaseMapFull *map,
uint8_t *dest, int32_t destCapacity,
const uint8_t *src, UCaseContext *csc,
int32_t srcStart, int32_t srcLimit,
UErrorCode *pErrorCode) {
const UChar *s;
UChar32 c, c2 = 0;
int32_t srcIndex, destIndex;
int32_t locCache;
locCache=csm->locCache;
/* case mapping loop */
srcIndex=srcStart;
destIndex=0;
while(srcIndex<srcLimit) {
csc->cpStart=srcIndex;
U8_NEXT(src, srcIndex, srcLimit, c);
csc->cpLimit=srcIndex;
if(c<0) {
int32_t i=csc->cpStart;
while(destIndex<destCapacity && i<srcIndex) {
dest[destIndex++]=src[i++];
}
continue;
}
c=map(csm->csp, c, utf8_caseContextIterator, csc, &s, csm->locale, &locCache);
if((destIndex<destCapacity) && (c<0 ? (c2=~c)<=0x7f : UCASE_MAX_STRING_LENGTH<c && (c2=c)<=0x7f)) {
/* fast path version of appendResult() for ASCII results */
dest[destIndex++]=(uint8_t)c2;
} else {
destIndex=appendResult(dest, destIndex, destCapacity, c, s);
}
}
if(destIndex>destCapacity) {
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
}
return destIndex;
}
#if !UCONFIG_NO_BREAK_ITERATION
/*
* Internal titlecasing function.
*/
static int32_t
_toTitle(UCaseMap *csm,
uint8_t *dest, int32_t destCapacity,
const uint8_t *src, UCaseContext *csc,
int32_t srcLength,
UErrorCode *pErrorCode) {
UText utext=UTEXT_INITIALIZER;
const UChar *s;
UChar32 c;
int32_t prev, titleStart, titleLimit, idx, destIndex, length;
UBool isFirstIndex;
utext_openUTF8(&utext, (const char *)src, srcLength, pErrorCode);
if(U_FAILURE(*pErrorCode)) {
return 0;
}
if(csm->iter==NULL) {
csm->iter=ubrk_open(UBRK_WORD, csm->locale,
NULL, 0,
pErrorCode);
}
ubrk_setUText(csm->iter, &utext, pErrorCode);
if(U_FAILURE(*pErrorCode)) {
utext_close(&utext);
return 0;
}
/* set up local variables */
destIndex=0;
prev=0;
isFirstIndex=TRUE;
/* titlecasing loop */
while(prev<srcLength) {
/* find next index where to titlecase */
if(isFirstIndex) {
isFirstIndex=FALSE;
idx=ubrk_first(csm->iter);
} else {
idx=ubrk_next(csm->iter);
}
if(idx==UBRK_DONE || idx>srcLength) {
idx=srcLength;
}
/*
* Unicode 4 & 5 section 3.13 Default Case Operations:
*
* R3 toTitlecase(X): Find the word boundaries based on Unicode Standard Annex
* #29, "Text Boundaries." Between each pair of word boundaries, find the first
* cased character F. If F exists, map F to default_title(F); then map each
* subsequent character C to default_lower(C).
*
* In this implementation, segment [prev..index[ into 3 parts:
* a) uncased characters (copy as-is) [prev..titleStart[
* b) first case letter (titlecase) [titleStart..titleLimit[
* c) subsequent characters (lowercase) [titleLimit..index[
*/
if(prev<idx) {
/* find and copy uncased characters [prev..titleStart[ */
titleStart=titleLimit=prev;
U8_NEXT(src, titleLimit, idx, c);
if((csm->options&U_TITLECASE_NO_BREAK_ADJUSTMENT)==0 && UCASE_NONE==ucase_getType(csm->csp, c)) {
/* Adjust the titlecasing index (titleStart) to the next cased character. */
for(;;) {
titleStart=titleLimit;
if(titleLimit==idx) {
/*
* only uncased characters in [prev..index[
* stop with titleStart==titleLimit==index
*/
break;
}
U8_NEXT(src, titleLimit, idx, c);
if(UCASE_NONE!=ucase_getType(csm->csp, c)) {
break; /* cased letter at [titleStart..titleLimit[ */
}
}
length=titleStart-prev;
if(length>0) {
if((destIndex+length)<=destCapacity) {
uprv_memcpy(dest+destIndex, src+prev, length);
}
destIndex+=length;
}
}
if(titleStart<titleLimit) {
/* titlecase c which is from [titleStart..titleLimit[ */
csc->cpStart=titleStart;
csc->cpLimit=titleLimit;
c=ucase_toFullTitle(csm->csp, c, utf8_caseContextIterator, csc, &s, csm->locale, &csm->locCache);
destIndex=appendResult(dest, destIndex, destCapacity, c, s);
/* Special case Dutch IJ titlecasing */
if ( titleStart+1 < idx &&
ucase_getCaseLocale(csm->locale,&csm->locCache) == UCASE_LOC_DUTCH &&
( src[titleStart] == 0x0049 || src[titleStart] == 0x0069 ) &&
( src[titleStart+1] == 0x004A || src[titleStart+1] == 0x006A )) {
c=0x004A;
destIndex=appendResult(dest, destIndex, destCapacity, c, s);
titleLimit++;
}
/* lowercase [titleLimit..index[ */
if(titleLimit<idx) {
if((csm->options&U_TITLECASE_NO_LOWERCASE)==0) {
/* Normal operation: Lowercase the rest of the word. */
destIndex+=
_caseMap(
csm, ucase_toFullLower,
dest+destIndex, destCapacity-destIndex,
src, csc,
titleLimit, idx,
pErrorCode);
} else {
/* Optionally just copy the rest of the word unchanged. */
length=idx-titleLimit;
if((destIndex+length)<=destCapacity) {
uprv_memcpy(dest+destIndex, src+titleLimit, length);
}
destIndex+=length;
}
}
}
}
prev=idx;
}
if(destIndex>destCapacity) {
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
}
utext_close(&utext);
return destIndex;
}
#endif
static int32_t
utf8_foldCase(const UCaseProps *csp,
uint8_t *dest, int32_t destCapacity,
const uint8_t *src, int32_t srcLength,
uint32_t options,
UErrorCode *pErrorCode) {
int32_t srcIndex, destIndex;
const UChar *s;
UChar32 c, c2;
int32_t start;
/* case mapping loop */
srcIndex=destIndex=0;
while(srcIndex<srcLength) {
start=srcIndex;
U8_NEXT(src, srcIndex, srcLength, c);
if(c<0) {
while(destIndex<destCapacity && start<srcIndex) {
dest[destIndex++]=src[start++];
}
continue;
}
c=ucase_toFullFolding(csp, c, &s, options);
if((destIndex<destCapacity) && (c<0 ? (c2=~c)<=0x7f : UCASE_MAX_STRING_LENGTH<c && (c2=c)<=0x7f)) {
/* fast path version of appendResult() for ASCII results */
dest[destIndex++]=(uint8_t)c2;
} else {
destIndex=appendResult(dest, destIndex, destCapacity, c, s);
}
}
if(destIndex>destCapacity) {
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
}
return destIndex;
}
/*
* Implement argument checking and buffer handling
* for string case mapping as a common function.
*/
/* common internal function for public API functions */
static int32_t
caseMap(const UCaseMap *csm,
uint8_t *dest, int32_t destCapacity,
const uint8_t *src, int32_t srcLength,
int32_t toWhichCase,
UErrorCode *pErrorCode) {
int32_t destLength;
/* check argument values */
if(U_FAILURE(*pErrorCode)) {
return 0;
}
if( destCapacity<0 ||
(dest==NULL && destCapacity>0) ||
src==NULL ||
srcLength<-1
) {
*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
return 0;
}
/* get the string length */
if(srcLength==-1) {
srcLength=(int32_t)uprv_strlen((const char *)src);
}
/* check for overlapping source and destination */
if( dest!=NULL &&
((src>=dest && src<(dest+destCapacity)) ||
(dest>=src && dest<(src+srcLength)))
) {
*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
return 0;
}
destLength=0;
if(toWhichCase==FOLD_CASE) {
destLength=utf8_foldCase(csm->csp, dest, destCapacity, src, srcLength,
csm->options, pErrorCode);
} else {
UCaseContext csc={ NULL };
csc.p=(void *)src;
csc.limit=srcLength;
if(toWhichCase==TO_LOWER) {
destLength=_caseMap(csm, ucase_toFullLower,
dest, destCapacity,
src, &csc,
0, srcLength,
pErrorCode);
} else if(toWhichCase==TO_UPPER) {
destLength=_caseMap(csm, ucase_toFullUpper,
dest, destCapacity,
src, &csc,
0, srcLength,
pErrorCode);
} else /* if(toWhichCase==TO_TITLE) */ {
#if UCONFIG_NO_BREAK_ITERATION
*pErrorCode=U_UNSUPPORTED_ERROR;
#else
/* UCaseMap is actually non-const in toTitle() APIs. */
UCaseMap *tmp = (UCaseMap *)csm;
destLength=_toTitle(tmp, dest, destCapacity,
src, &csc, srcLength,
pErrorCode);
#endif
}
}
return u_terminateChars((char *)dest, destCapacity, destLength, pErrorCode);
}
/* public API functions */
U_CAPI int32_t U_EXPORT2
ucasemap_utf8ToLower(const UCaseMap *csm,
char *dest, int32_t destCapacity,
const char *src, int32_t srcLength,
UErrorCode *pErrorCode) {
return caseMap(csm,
(uint8_t *)dest, destCapacity,
(const uint8_t *)src, srcLength,
TO_LOWER, pErrorCode);
}
U_CAPI int32_t U_EXPORT2
ucasemap_utf8ToUpper(const UCaseMap *csm,
char *dest, int32_t destCapacity,
const char *src, int32_t srcLength,
UErrorCode *pErrorCode) {
return caseMap(csm,
(uint8_t *)dest, destCapacity,
(const uint8_t *)src, srcLength,
TO_UPPER, pErrorCode);
}
#if !UCONFIG_NO_BREAK_ITERATION
U_CAPI int32_t U_EXPORT2
ucasemap_utf8ToTitle(UCaseMap *csm,
char *dest, int32_t destCapacity,
const char *src, int32_t srcLength,
UErrorCode *pErrorCode) {
return caseMap(csm,
(uint8_t *)dest, destCapacity,
(const uint8_t *)src, srcLength,
TO_TITLE, pErrorCode);
}
#endif
U_CAPI int32_t U_EXPORT2
ucasemap_utf8FoldCase(const UCaseMap *csm,
char *dest, int32_t destCapacity,
const char *src, int32_t srcLength,
UErrorCode *pErrorCode) {
return caseMap(csm,
(uint8_t *)dest, destCapacity,
(const uint8_t *)src, srcLength,
FOLD_CASE, pErrorCode);
}