52 lines
2.1 KiB
C++
52 lines
2.1 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_UTILS_GRAMMAR_SEMANTICS_EVALUATORS_CONSTITUENT_EVAL_H_
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#define LIBTEXTCLASSIFIER_UTILS_GRAMMAR_SEMANTICS_EVALUATORS_CONSTITUENT_EVAL_H_
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#include "utils/base/arena.h"
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#include "utils/grammar/semantics/eval-context.h"
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#include "utils/grammar/semantics/evaluator.h"
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#include "utils/grammar/semantics/expression_generated.h"
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#include "utils/grammar/semantics/value.h"
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namespace libtextclassifier3::grammar {
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// Returns the semantic value of an evaluated constituent.
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class ConstituentEvaluator : public SemanticExpressionEvaluator {
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public:
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StatusOr<const SemanticValue*> Apply(const EvalContext& context,
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const SemanticExpression* expression,
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UnsafeArena*) const override {
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TC3_DCHECK_EQ(expression->expression_type(),
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SemanticExpression_::Expression_ConstituentExpression);
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const ConstituentExpression* constituent_expression =
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expression->expression_as_ConstituentExpression();
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const auto constituent_it =
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context.rule_constituents.find(constituent_expression->id());
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if (constituent_it != context.rule_constituents.end()) {
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return constituent_it->second;
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}
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// The constituent was not present in the rule parse tree, return a
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// null value for it.
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return nullptr;
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}
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};
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} // namespace libtextclassifier3::grammar
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#endif // LIBTEXTCLASSIFIER_UTILS_GRAMMAR_SEMANTICS_EVALUATORS_CONSTITUENT_EVAL_H_
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