| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * 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. |
| */ |
| |
| #ifndef LIBTEXTCLASSIFIER_DATETIME_PARSER_H_ |
| #define LIBTEXTCLASSIFIER_DATETIME_PARSER_H_ |
| |
| #include <memory> |
| #include <string> |
| #include <unordered_map> |
| #include <vector> |
| |
| #include "model_generated.h" |
| #include "types.h" |
| #include "util/base/integral_types.h" |
| #include "util/calendar/calendar.h" |
| #include "util/utf8/unilib.h" |
| |
| namespace libtextclassifier2 { |
| |
| // Parses datetime expressions in the input and resolves them to actual absolute |
| // time. |
| class DatetimeParser { |
| public: |
| static std::unique_ptr<DatetimeParser> Instance(const DatetimeModel* model, |
| const UniLib& unilib); |
| |
| // Parses the dates in 'input' and fills result. Makes sure that the results |
| // do not overlap. |
| bool Parse(const std::string& input, int64 reference_time_ms_utc, |
| const std::string& reference_timezone, const std::string& locales, |
| std::vector<DatetimeParseResultSpan>* results) const; |
| |
| // Same as above but takes UnicodeText. |
| bool Parse(const UnicodeText& input, int64 reference_time_ms_utc, |
| const std::string& reference_timezone, const std::string& locales, |
| std::vector<DatetimeParseResultSpan>* results) const; |
| |
| protected: |
| DatetimeParser(const DatetimeModel* model, const UniLib& unilib); |
| |
| // Returns a list of locale ids for given locale spec string (comma-separated |
| // locale names). |
| std::vector<int> ParseLocales(const std::string& locales) const; |
| bool ParseWithRule(const UniLib::RegexPattern& regex, |
| const DatetimeModelPattern* pattern, |
| const UnicodeText& input, int64 reference_time_ms_utc, |
| const std::string& reference_timezone, const int locale_id, |
| std::vector<DatetimeParseResultSpan>* result) const; |
| |
| // Converts the current match in 'matcher' into DatetimeParseResult. |
| bool ExtractDatetime(const UniLib::RegexMatcher& matcher, |
| int64 reference_time_ms_utc, |
| const std::string& reference_timezone, int locale_id, |
| DatetimeParseResult* result) const; |
| |
| private: |
| bool initialized_; |
| const UniLib& unilib_; |
| std::vector<const DatetimeModelPattern*> rule_id_to_pattern_; |
| std::vector<std::unique_ptr<UniLib::RegexPattern>> rules_; |
| std::unordered_map<int, std::vector<int>> locale_to_rules_; |
| std::vector<std::unique_ptr<UniLib::RegexPattern>> extractor_rules_; |
| std::unordered_map<DatetimeExtractorType, std::unordered_map<int, int>> |
| type_and_locale_to_extractor_rule_; |
| std::unordered_map<std::string, int> locale_string_to_id_; |
| CalendarLib calendar_lib_; |
| }; |
| |
| } // namespace libtextclassifier2 |
| |
| #endif // LIBTEXTCLASSIFIER_DATETIME_PARSER_H_ |