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| 1 // Copyright 2011 the V8 project authors. All rights reserved. | |
| 2 // Redistribution and use in source and binary forms, with or without | |
| 3 // modification, are permitted provided that the following conditions are | |
| 4 // met: | |
| 5 // | |
| 6 // * Redistributions of source code must retain the above copyright | |
| 7 // notice, this list of conditions and the following disclaimer. | |
| 8 // * Redistributions in binary form must reproduce the above | |
| 9 // copyright notice, this list of conditions and the following | |
| 10 // disclaimer in the documentation and/or other materials provided | |
| 11 // with the distribution. | |
| 12 // * Neither the name of Google Inc. nor the names of its | |
| 13 // contributors may be used to endorse or promote products derived | |
| 14 // from this software without specific prior written permission. | |
| 15 // | |
| 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 27 | |
| 28 #ifndef V8_EXTENSIONS_EXPERIMENTAL_LANGUAGE_MATCHER_H_ | |
| 29 #define V8_EXTENSIONS_EXPERIMENTAL_LANGUAGE_MATCHER_H_ | |
| 30 | |
| 31 #include "include/v8.h" | |
| 32 | |
| 33 #include "unicode/uloc.h" | |
| 34 | |
| 35 namespace v8 { | |
| 36 namespace internal { | |
| 37 | |
| 38 struct LocaleIDMatch { | |
| 39 LocaleIDMatch(); | |
| 40 | |
| 41 LocaleIDMatch& operator=(const LocaleIDMatch& rhs); | |
| 42 | |
| 43 // Bcp47 locale id - "de-Latn-DE-u-co-phonebk". | |
| 44 char bcp47_id[ULOC_FULLNAME_CAPACITY]; | |
| 45 | |
| 46 // ICU locale id - "de_Latn_DE@collation=phonebk". | |
| 47 char icu_id[ULOC_FULLNAME_CAPACITY]; | |
| 48 | |
| 49 // Score for this locale. | |
| 50 int score; | |
| 51 }; | |
| 52 | |
| 53 class LanguageMatcher { | |
| 54 public: | |
| 55 // Default locale. | |
| 56 static const char* const kDefaultLocale; | |
| 57 | |
| 58 // Finds best supported locale for a given a list of locale identifiers. | |
| 59 // It preserves the extension for the locale id. | |
| 60 static void GetBestMatchForPriorityList( | |
| 61 v8::Handle<v8::Array> locale_list, LocaleIDMatch* result); | |
| 62 | |
| 63 // Finds best supported locale for a single locale identifier. | |
| 64 // It preserves the extension for the locale id. | |
| 65 static void GetBestMatchForString( | |
| 66 v8::Handle<v8::String> locale_id, LocaleIDMatch* result); | |
| 67 | |
| 68 private: | |
| 69 // If langauge subtags match add this amount to the score. | |
| 70 static const unsigned int kLanguageWeight; | |
| 71 | |
| 72 // If script subtags match add this amount to the score. | |
| 73 static const unsigned int kScriptWeight; | |
| 74 | |
| 75 // If region subtags match add this amount to the score. | |
| 76 static const unsigned int kRegionWeight; | |
| 77 | |
| 78 // LocaleID match score has to be over this number to accept the match. | |
| 79 static const unsigned int kThreshold; | |
| 80 | |
| 81 // For breaking ties in priority queue. | |
| 82 static const unsigned int kPositionBonus; | |
| 83 | |
| 84 LanguageMatcher(); | |
| 85 | |
| 86 // Compares locale_id to the supported list of locales and returns best | |
| 87 // match. | |
| 88 // Returns false if it fails to convert locale id from ICU to BCP47 format. | |
| 89 static bool CompareToSupportedLocaleIDList(v8::Handle<v8::String> locale_id, | |
| 90 LocaleIDMatch* result); | |
| 91 }; | |
| 92 | |
| 93 } } // namespace v8::internal | |
| 94 | |
| 95 #endif // V8_EXTENSIONS_EXPERIMENTAL_LANGUAGE_MATCHER_H_ | |
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