111 lines
3.5 KiB
C++
111 lines
3.5 KiB
C++
/*
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*******************************************************************************
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* Copyright (C) 2011, International Business Machines
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* Corporation and others. All Rights Reserved.
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*******************************************************************************
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* file name: ustrcase_locale.cpp
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* encoding: US-ASCII
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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: 2011may31
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* created by: Markus W. Scherer
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*
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* Locale-sensitive case mapping functions (ones that call uloc_getDefault())
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* were moved here to break dependency cycles among parts of the common library.
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*/
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#include "unicode/utypes.h"
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#include "unicode/ucasemap.h"
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#include "unicode/uloc.h"
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#include "unicode/ustring.h"
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#include "ucase.h"
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#include "ustr_imp.h"
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U_CFUNC void
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ustrcase_setTempCaseMapLocale(UCaseMap *csm, const char *locale) {
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/*
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* We could call ucasemap_setLocale(), but here we really only care about
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* the initial language subtag, we need not return the real string via
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* ucasemap_getLocale(), and we don't care about only getting "x" from
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* "x-some-thing" etc.
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*
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* We ignore locales with a longer-than-3 initial subtag.
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*
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* We also do not fill in the locCache because it is rarely used,
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* and not worth setting unless we reuse it for many case mapping operations.
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* (That's why UCaseMap was created.)
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*/
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int i;
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char c;
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/* the internal functions require locale!=NULL */
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if(locale==NULL) {
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// Do not call uprv_getDefaultLocaleID() because that does not see
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// changes to the default locale via uloc_setDefault().
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// It would also be inefficient if used frequently because uprv_getDefaultLocaleID()
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// does not cache the locale ID.
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//
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// Unfortunately, uloc_getDefault() has many dependencies.
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// We only care about a small set of language subtags,
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// and we do not need the locale ID to be canonicalized.
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//
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// Best is to not call case mapping functions with a NULL locale ID.
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locale=uloc_getDefault();
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}
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for(i=0; i<4 && (c=locale[i])!=0 && c!='-' && c!='_'; ++i) {
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csm->locale[i]=c;
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}
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if(i<=3) {
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csm->locale[i]=0; /* Up to 3 non-separator characters. */
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} else {
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csm->locale[0]=0; /* Longer-than-3 initial subtag: Ignore. */
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}
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}
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/*
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* Set parameters on an empty UCaseMap, for UCaseMap-less API functions.
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* Do this fast because it is called with every function call.
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*/
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static inline void
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setTempCaseMap(UCaseMap *csm, const char *locale) {
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if(csm->csp==NULL) {
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csm->csp=ucase_getSingleton();
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}
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if(locale!=NULL && locale[0]==0) {
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csm->locale[0]=0;
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} else {
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ustrcase_setTempCaseMapLocale(csm, locale);
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}
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}
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/* public API functions */
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U_CAPI int32_t U_EXPORT2
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u_strToLower(UChar *dest, int32_t destCapacity,
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const UChar *src, int32_t srcLength,
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const char *locale,
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UErrorCode *pErrorCode) {
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UCaseMap csm=UCASEMAP_INITIALIZER;
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setTempCaseMap(&csm, locale);
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return ustrcase_map(
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&csm,
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dest, destCapacity,
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src, srcLength,
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ustrcase_internalToLower, pErrorCode);
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}
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U_CAPI int32_t U_EXPORT2
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u_strToUpper(UChar *dest, int32_t destCapacity,
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const UChar *src, int32_t srcLength,
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const char *locale,
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UErrorCode *pErrorCode) {
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UCaseMap csm=UCASEMAP_INITIALIZER;
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setTempCaseMap(&csm, locale);
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return ustrcase_map(
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&csm,
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dest, destCapacity,
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src, srcLength,
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ustrcase_internalToUpper, pErrorCode);
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}
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