69 lines
2.8 KiB
C++
69 lines
2.8 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_CONST_EVAL_H_
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#define LIBTEXTCLASSIFIER_UTILS_GRAMMAR_SEMANTICS_EVALUATORS_CONST_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 a constant value of a given type.
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class ConstEvaluator : public SemanticExpressionEvaluator {
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public:
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explicit ConstEvaluator(const reflection::Schema* semantic_values_schema)
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: semantic_values_schema_(semantic_values_schema) {}
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StatusOr<const SemanticValue*> Apply(const EvalContext&,
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const SemanticExpression* expression,
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UnsafeArena* arena) const override {
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TC3_DCHECK_EQ(expression->expression_type(),
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SemanticExpression_::Expression_ConstValueExpression);
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const ConstValueExpression* const_value_expression =
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expression->expression_as_ConstValueExpression();
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const reflection::BaseType base_type =
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static_cast<reflection::BaseType>(const_value_expression->base_type());
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const StringPiece data = StringPiece(
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reinterpret_cast<const char*>(const_value_expression->value()->data()),
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const_value_expression->value()->size());
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if (base_type == reflection::BaseType::Obj) {
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// Resolve the object type.
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const int type_id = const_value_expression->type();
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if (type_id < 0 ||
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type_id >= semantic_values_schema_->objects()->size()) {
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return Status(StatusCode::INVALID_ARGUMENT, "Invalid type.");
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}
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return SemanticValue::Create(semantic_values_schema_->objects()->Get(
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const_value_expression->type()),
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data, arena);
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} else {
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return SemanticValue::Create(base_type, data, arena);
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}
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}
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private:
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const reflection::Schema* semantic_values_schema_;
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};
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} // namespace libtextclassifier3::grammar
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#endif // LIBTEXTCLASSIFIER_UTILS_GRAMMAR_SEMANTICS_EVALUATORS_CONST_EVAL_H_
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