+/*
+*******************************************************************************
+*
+* Copyright (C) 2005-2011, International Business Machines
+* Corporation and others. All Rights Reserved.
+*
+*******************************************************************************
+* file name: ucasemap.cpp
+* 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/brkiter.h"
+#include "unicode/ubrk.h"
+#include "unicode/uloc.h"
+#include "unicode/ustring.h"
+#include "unicode/ucasemap.h"
+#if !UCONFIG_NO_BREAK_ITERATION
+#include "unicode/utext.h"
+#endif
+#include "unicode/utf.h"
+#include "unicode/utf8.h"
+#include "unicode/utf16.h"
+#include "cmemory.h"
+#include "cstring.h"
+#include "ucase.h"
+#include "ustr_imp.h"
+
+U_NAMESPACE_USE
+
+/* 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();
+ 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
+ // Do not call ubrk_close() so that we do not depend on all of the BreakIterator code.
+ delete reinterpret_cast<BreakIterator *>(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;
+}
+
+/* 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 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
+
+U_CFUNC int32_t U_CALLCONV
+ucasemap_internalUTF8ToTitle(const UCaseMap *csm,
+ uint8_t *dest, int32_t destCapacity,
+ const uint8_t *src, int32_t srcLength,
+ UErrorCode *pErrorCode) {
+ const UChar *s;
+ UChar32 c;
+ int32_t prev, titleStart, titleLimit, idx, destIndex, length;
+ UBool isFirstIndex;
+
+ if(U_FAILURE(*pErrorCode)) {
+ return 0;
+ }
+
+ // Use the C++ abstract base class to minimize dependencies.
+ // TODO: Change UCaseMap.iter to store a BreakIterator directly.
+ BreakIterator *bi=reinterpret_cast<BreakIterator *>(csm->iter);
+
+ /* set up local variables */
+ int32_t locCache=csm->locCache;
+ UCaseContext csc=UCASECONTEXT_INITIALIZER;
+ csc.p=(void *)src;
+ csc.limit=srcLength;
+ destIndex=0;
+ prev=0;
+ isFirstIndex=TRUE;
+
+ /* titlecasing loop */
+ while(prev<srcLength) {
+ /* find next index where to titlecase */
+ if(isFirstIndex) {
+ isFirstIndex=FALSE;
+ idx=bi->first();
+ } else {
+ idx=bi->next();
+ }
+ 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, &locCache);
+ destIndex=appendResult(dest, destIndex, destCapacity, c, s);
+
+ /* Special case Dutch IJ titlecasing */
+ if ( titleStart+1 < idx &&
+ ucase_getCaseLocale(csm->locale, &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;
+ }
+ return destIndex;
+}
+
+#endif
+
+static int32_t U_CALLCONV
+ucasemap_internalUTF8ToLower(const UCaseMap *csm,
+ uint8_t *dest, int32_t destCapacity,
+ const uint8_t *src, int32_t srcLength,
+ UErrorCode *pErrorCode) {
+ UCaseContext csc=UCASECONTEXT_INITIALIZER;
+ csc.p=(void *)src;
+ csc.limit=srcLength;
+ return _caseMap(
+ csm, ucase_toFullLower,
+ dest, destCapacity,
+ src, &csc, 0, srcLength,
+ pErrorCode);
+}
+
+static int32_t U_CALLCONV
+ucasemap_internalUTF8ToUpper(const UCaseMap *csm,
+ uint8_t *dest, int32_t destCapacity,
+ const uint8_t *src, int32_t srcLength,
+ UErrorCode *pErrorCode) {
+ UCaseContext csc=UCASECONTEXT_INITIALIZER;
+ csc.p=(void *)src;
+ csc.limit=srcLength;
+ return _caseMap(
+ csm, ucase_toFullUpper,
+ dest, destCapacity,
+ src, &csc, 0, srcLength,
+ pErrorCode);
+}
+
+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;
+}
+
+static int32_t U_CALLCONV
+ucasemap_internalUTF8Fold(const UCaseMap *csm,
+ uint8_t *dest, int32_t destCapacity,
+ const uint8_t *src, int32_t srcLength,
+ UErrorCode *pErrorCode) {
+ return utf8_foldCase(csm->csp, dest, destCapacity, src, srcLength, csm->options, pErrorCode);
+}
+
+U_CFUNC int32_t
+ucasemap_mapUTF8(const UCaseMap *csm,
+ uint8_t *dest, int32_t destCapacity,
+ const uint8_t *src, int32_t srcLength,
+ UTF8CaseMapper *stringCaseMapper,
+ 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=stringCaseMapper(csm, dest, destCapacity, src, srcLength, pErrorCode);
+ 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 ucasemap_mapUTF8(csm,
+ (uint8_t *)dest, destCapacity,
+ (const uint8_t *)src, srcLength,
+ ucasemap_internalUTF8ToLower, 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 ucasemap_mapUTF8(csm,
+ (uint8_t *)dest, destCapacity,
+ (const uint8_t *)src, srcLength,
+ ucasemap_internalUTF8ToUpper, pErrorCode);
+}
+
+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 ucasemap_mapUTF8(csm,
+ (uint8_t *)dest, destCapacity,
+ (const uint8_t *)src, srcLength,
+ ucasemap_internalUTF8Fold, pErrorCode);
+}
projects / apple / icu.git / blobdiff