michael@0: /*
michael@0: *******************************************************************************
michael@0: *   Copyright (C) 2011, International Business Machines
michael@0: *   Corporation and others.  All Rights Reserved.
michael@0: *******************************************************************************
michael@0: *   file name:  ustrcase_locale.cpp
michael@0: *   encoding:   US-ASCII
michael@0: *   tab size:   8 (not used)
michael@0: *   indentation:4
michael@0: *
michael@0: *   created on: 2011may31
michael@0: *   created by: Markus W. Scherer
michael@0: *
michael@0: *   Locale-sensitive case mapping functions (ones that call uloc_getDefault())
michael@0: *   were moved here to break dependency cycles among parts of the common library.
michael@0: */
michael@0: 
michael@0: #include "unicode/utypes.h"
michael@0: #include "unicode/ucasemap.h"
michael@0: #include "unicode/uloc.h"
michael@0: #include "unicode/ustring.h"
michael@0: #include "ucase.h"
michael@0: #include "ustr_imp.h"
michael@0: 
michael@0: U_CFUNC void
michael@0: ustrcase_setTempCaseMapLocale(UCaseMap *csm, const char *locale) {
michael@0:     /*
michael@0:      * We could call ucasemap_setLocale(), but here we really only care about
michael@0:      * the initial language subtag, we need not return the real string via
michael@0:      * ucasemap_getLocale(), and we don't care about only getting "x" from
michael@0:      * "x-some-thing" etc.
michael@0:      *
michael@0:      * We ignore locales with a longer-than-3 initial subtag.
michael@0:      *
michael@0:      * We also do not fill in the locCache because it is rarely used,
michael@0:      * and not worth setting unless we reuse it for many case mapping operations.
michael@0:      * (That's why UCaseMap was created.)
michael@0:      */
michael@0:     int i;
michael@0:     char c;
michael@0: 
michael@0:     /* the internal functions require locale!=NULL */
michael@0:     if(locale==NULL) {
michael@0:         // Do not call uprv_getDefaultLocaleID() because that does not see
michael@0:         // changes to the default locale via uloc_setDefault().
michael@0:         // It would also be inefficient if used frequently because uprv_getDefaultLocaleID()
michael@0:         // does not cache the locale ID.
michael@0:         //
michael@0:         // Unfortunately, uloc_getDefault() has many dependencies.
michael@0:         // We only care about a small set of language subtags,
michael@0:         // and we do not need the locale ID to be canonicalized.
michael@0:         //
michael@0:         // Best is to not call case mapping functions with a NULL locale ID.
michael@0:         locale=uloc_getDefault();
michael@0:     }
michael@0:     for(i=0; i<4 && (c=locale[i])!=0 && c!='-' && c!='_'; ++i) {
michael@0:         csm->locale[i]=c;
michael@0:     }
michael@0:     if(i<=3) {
michael@0:         csm->locale[i]=0;  /* Up to 3 non-separator characters. */
michael@0:     } else {
michael@0:         csm->locale[0]=0;  /* Longer-than-3 initial subtag: Ignore. */
michael@0:     }
michael@0: }
michael@0: 
michael@0: /*
michael@0:  * Set parameters on an empty UCaseMap, for UCaseMap-less API functions.
michael@0:  * Do this fast because it is called with every function call.
michael@0:  */
michael@0: static inline void
michael@0: setTempCaseMap(UCaseMap *csm, const char *locale) {
michael@0:     if(csm->csp==NULL) {
michael@0:         csm->csp=ucase_getSingleton();
michael@0:     }
michael@0:     if(locale!=NULL && locale[0]==0) {
michael@0:         csm->locale[0]=0;
michael@0:     } else {
michael@0:         ustrcase_setTempCaseMapLocale(csm, locale);
michael@0:     }
michael@0: }
michael@0: 
michael@0: /* public API functions */
michael@0: 
michael@0: U_CAPI int32_t U_EXPORT2
michael@0: u_strToLower(UChar *dest, int32_t destCapacity,
michael@0:              const UChar *src, int32_t srcLength,
michael@0:              const char *locale,
michael@0:              UErrorCode *pErrorCode) {
michael@0:     UCaseMap csm=UCASEMAP_INITIALIZER;
michael@0:     setTempCaseMap(&csm, locale);
michael@0:     return ustrcase_map(
michael@0:         &csm,
michael@0:         dest, destCapacity,
michael@0:         src, srcLength,
michael@0:         ustrcase_internalToLower, pErrorCode);
michael@0: }
michael@0: 
michael@0: U_CAPI int32_t U_EXPORT2
michael@0: u_strToUpper(UChar *dest, int32_t destCapacity,
michael@0:              const UChar *src, int32_t srcLength,
michael@0:              const char *locale,
michael@0:              UErrorCode *pErrorCode) {
michael@0:     UCaseMap csm=UCASEMAP_INITIALIZER;
michael@0:     setTempCaseMap(&csm, locale);
michael@0:     return ustrcase_map(
michael@0:         &csm,
michael@0:         dest, destCapacity,
michael@0:         src, srcLength,
michael@0:         ustrcase_internalToUpper, pErrorCode);
michael@0: }