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Diffstat (limited to 'toolkit/components/translation/cld2/internal/compact_lang_det_hint_code.h')
-rw-r--r-- | toolkit/components/translation/cld2/internal/compact_lang_det_hint_code.h | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/toolkit/components/translation/cld2/internal/compact_lang_det_hint_code.h b/toolkit/components/translation/cld2/internal/compact_lang_det_hint_code.h new file mode 100644 index 0000000000..df8948a27f --- /dev/null +++ b/toolkit/components/translation/cld2/internal/compact_lang_det_hint_code.h @@ -0,0 +1,95 @@ +// Copyright 2013 Google Inc. All Rights Reserved. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +// +// Author: dsites@google.com (Dick Sites) +// + +#ifndef I18N_ENCODINGS_COMPACT_LANG_DET_COMPACT_LANG_DET_HINT_CODE_H__ +#define I18N_ENCODINGS_COMPACT_LANG_DET_COMPACT_LANG_DET_HINT_CODE_H__ + + +#include <string> +#include "integral_types.h" +#include "lang_script.h" +#include "../public/encodings.h" + +namespace CLD2 { + +// Packed <Language, weight>, weight in [-32..31] (powers of 2**1.6 ~=3.03) +// Full language in bottom 10 bits, weight in top 6 bits +typedef int16 OneCLDLangPrior; + +const int kMaxOneCLDLangPrior = 14; +typedef struct { + int32 n; + OneCLDLangPrior prior[kMaxOneCLDLangPrior]; +} CLDLangPriors; + +// Reading exposed here; setting hidden in .cc +inline int GetCLDPriorWeight(OneCLDLangPrior olp) { + return olp >> 10; +} +inline Language GetCLDPriorLang(OneCLDLangPrior olp) { + return static_cast<Language>(olp & 0x3ff); +} + +inline int32 GetCLDLangPriorCount(CLDLangPriors* lps) { + return lps->n; +} + +inline void InitCLDLangPriors(CLDLangPriors* lps) { + lps->n = 0; +} + +// Trim language priors to no more than max_entries, keeping largest abs weights +void TrimCLDLangPriors(int max_entries, CLDLangPriors* lps); + +// Trim language tag string to canonical form for each language +// Input is from GetLangTagsFromHtml(), already lowercased +std::string TrimCLDLangTagsHint(const std::string& langtags); + +// Add hints to vector of langpriors +// Input is from GetLangTagsFromHtml(), already lowercased +void SetCLDLangTagsHint(const std::string& langtags, CLDLangPriors* langpriors); + +// Add hints to vector of langpriors +// Input is from HTTP content-language +void SetCLDContentLangHint(const char* contentlang, CLDLangPriors* langpriors); + +// Add hints to vector of langpriors +// Input is from GetTLD(), already lowercased +void SetCLDTLDHint(const char* tld, CLDLangPriors* langpriors); + +// Add hints to vector of langpriors +// Input is from DetectEncoding() +void SetCLDEncodingHint(Encoding enc, CLDLangPriors* langpriors); + +// Add hints to vector of langpriors +// Input is from random source +void SetCLDLanguageHint(Language lang, CLDLangPriors* langpriors); + +// Make printable string of priors +std::string DumpCLDLangPriors(const CLDLangPriors* langpriors); + + +// Get language tag hints from HTML body +// Normalize: remove spaces and make lowercase comma list +std::string GetLangTagsFromHtml(const char* utf8_body, int32 utf8_body_len, + int32 max_scan_bytes); + +} // End namespace CLD2 + +#endif // I18N_ENCODINGS_COMPACT_LANG_DET_COMPACT_LANG_DET_HINT_CODE_H__ + |