ICU-491.11.1.tar.gz

[apple/icu.git] / icuSources / common / ustrcase_locale.cpp

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