65 lines
2.2 KiB
C++
65 lines
2.2 KiB
C++
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef LIBTEXTCLASSIFIER_ANNOTATOR_GRAMMAR_DATES_PARSER_H_
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#define LIBTEXTCLASSIFIER_ANNOTATOR_GRAMMAR_DATES_PARSER_H_
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#include <vector>
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#include "annotator/grammar/dates/annotations/annotation-options.h"
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#include "annotator/grammar/dates/annotations/annotation.h"
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#include "annotator/grammar/dates/dates_generated.h"
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#include "annotator/grammar/dates/utils/date-match.h"
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#include "utils/grammar/lexer.h"
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#include "utils/grammar/rules-utils.h"
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#include "utils/i18n/locale.h"
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#include "utils/strings/stringpiece.h"
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#include "utils/utf8/unilib.h"
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namespace libtextclassifier3::dates {
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// Parses datetime expressions in the input with the datetime grammar and
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// constructs, validates, deduplicates and normalizes date time annotations.
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class DateParser {
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public:
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explicit DateParser(const UniLib* unilib, const DatetimeRules* datetime_rules)
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: unilib_(*unilib),
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lexer_(unilib, datetime_rules->rules()),
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datetime_rules_(datetime_rules),
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rules_locales_(ParseRulesLocales(datetime_rules->rules())) {}
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// Parses the dates in the input. Makes sure that the results do not
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// overlap.
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std::vector<DatetimeParseResultSpan> Parse(
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StringPiece text, const std::vector<Token>& tokens,
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const std::vector<Locale>& locales,
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const DateAnnotationOptions& options) const;
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private:
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const UniLib& unilib_;
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const grammar::Lexer lexer_;
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// The datetime grammar.
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const DatetimeRules* datetime_rules_;
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// Pre-parsed locales of the rules.
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const std::vector<std::vector<Locale>> rules_locales_;
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};
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} // namespace libtextclassifier3::dates
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#endif // LIBTEXTCLASSIFIER_ANNOTATOR_GRAMMAR_DATES_PARSER_H_
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