1 /* 2 * Copyright (C) 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef LIBTEXTCLASSIFIER_UTILS_GRAMMAR_SEMANTICS_EVALUATORS_MERGE_VALUES_EVAL_H_ 18 #define LIBTEXTCLASSIFIER_UTILS_GRAMMAR_SEMANTICS_EVALUATORS_MERGE_VALUES_EVAL_H_ 19 20 #include "utils/base/arena.h" 21 #include "utils/base/status_macros.h" 22 #include "utils/flatbuffers/mutable.h" 23 #include "utils/grammar/semantics/eval-context.h" 24 #include "utils/grammar/semantics/evaluator.h" 25 #include "utils/grammar/semantics/expression_generated.h" 26 #include "utils/grammar/semantics/value.h" 27 28 namespace libtextclassifier3::grammar { 29 30 // Evaluate the “merge” semantic function expression. 31 // Conceptually, the way this merge evaluator works is that each of the 32 // arguments (semantic value) is merged into a return type semantic value. 33 class MergeValuesEvaluator : public SemanticExpressionEvaluator { 34 public: MergeValuesEvaluator(const SemanticExpressionEvaluator * composer,const reflection::Schema * semantic_values_schema)35 explicit MergeValuesEvaluator( 36 const SemanticExpressionEvaluator* composer, 37 const reflection::Schema* semantic_values_schema) 38 : composer_(composer), semantic_value_builder_(semantic_values_schema) {} 39 40 StatusOr<const SemanticValue*> Apply(const EvalContext& context, 41 const SemanticExpression* expression, 42 UnsafeArena* arena) const override; 43 44 private: 45 const SemanticExpressionEvaluator* composer_; 46 const MutableFlatbufferBuilder semantic_value_builder_; 47 }; 48 } // namespace libtextclassifier3::grammar 49 50 #endif // LIBTEXTCLASSIFIER_UTILS_GRAMMAR_SEMANTICS_EVALUATORS_MERGE_VALUES_EVAL_H_ 51