Update ICU to 54.1 step 1

source/common/loclikely.cpp

 /*
 *******************************************************************************
 *
-*   Copyright (C) 1997-2012, International Business Machines
+*   Copyright (C) 1997-2014, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 *
 *******************************************************************************
 *   file name:  loclikely.cpp
 *   encoding:   US-ASCII
 *   tab size:   8 (not used)
 *   indentation:4
 *
 *   created on: 2010feb25
 *   created by: Markus W. Scherer
 *
 *   Code for likely and minimized locale subtags, separated out from other .cpp files
 *   that then do not depend on resource bundle code and likely-subtags data.
 */
 
 #include "unicode/utypes.h"
+#include "unicode/locid.h"
 #include "unicode/putil.h"
 #include "unicode/uloc.h"
 #include "unicode/ures.h"
+#include "unicode/uscript.h"
 #include "cmemory.h"
 #include "cstring.h"
 #include "ulocimp.h"
 #include "ustr_imp.h"
 
 /**
  * This function looks for the localeID in the likelySubtags resource.
  *
  * @param localeID The tag to find.
  * @param buffer A buffer to hold the matching entry
@@ skipping 1232 matching lines @@
         return -1;
     }
     else {
         return _uloc_minimizeSubtags(
                     localeBuffer,
                     minimizedLocaleID,
                     minimizedLocaleIDCapacity,
                     err);
     }    
 }
+
+// Pairs of (language subtag, + or -) for finding out fast if common languages
+// are LTR (minus) or RTL (plus).
+static const char* LANG_DIR_STRING =
+        "root-en-es-pt-zh-ja-ko-de-fr-it-ar+he+fa+ru-nl-pl-th-tr-";
+
+// Implemented here because this calls uloc_addLikelySubtags().
+U_CAPI UBool U_EXPORT2
+uloc_isRightToLeft(const char *locale) {
+    UErrorCode errorCode = U_ZERO_ERROR;
+    char script[8];
+    int32_t scriptLength = uloc_getScript(locale, script, UPRV_LENGTHOF(script), &errorCode);
+    if (U_FAILURE(errorCode) || errorCode == U_STRING_NOT_TERMINATED_WARNING ||
+            scriptLength == 0) {
+        // Fastpath: We know the likely scripts and their writing direction
+        // for some common languages.
+        errorCode = U_ZERO_ERROR;
+        char lang[8];
+        int32_t langLength = uloc_getLanguage(locale, lang, UPRV_LENGTHOF(lang), &errorCode);
+        if (U_FAILURE(errorCode) || errorCode == U_STRING_NOT_TERMINATED_WARNING ||
+                langLength == 0) {
+            return FALSE;
+        }
+        const char* langPtr = uprv_strstr(LANG_DIR_STRING, lang);
+        if (langPtr != NULL) {
+            switch (langPtr[langLength]) {
+            case '-': return FALSE;
+            case '+': return TRUE;
+            default: break;  // partial match of a longer code
+            }
+        }
+        // Otherwise, find the likely script.
+        errorCode = U_ZERO_ERROR;
+        char likely[ULOC_FULLNAME_CAPACITY];
+        (void)uloc_addLikelySubtags(locale, likely, UPRV_LENGTHOF(likely), &errorCode);
+        if (U_FAILURE(errorCode) || errorCode == U_STRING_NOT_TERMINATED_WARNING) {
+            return FALSE;
+        }
+        scriptLength = uloc_getScript(likely, script, UPRV_LENGTHOF(script), &errorCode);
+        if (U_FAILURE(errorCode) || errorCode == U_STRING_NOT_TERMINATED_WARNING ||
+                scriptLength == 0) {
+            return FALSE;
+        }
+    }
+    UScriptCode scriptCode = (UScriptCode)u_getPropertyValueEnum(UCHAR_SCRIPT, script);
+    return uscript_isRightToLeft(scriptCode);
+}
+
+U_NAMESPACE_BEGIN
+
+UBool
+Locale::isRightToLeft() const {
+    return uloc_isRightToLeft(getBaseName());
+}
+
+U_NAMESPACE_END