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_EVALUATOR_H_ 18 #define LIBTEXTCLASSIFIER_UTILS_GRAMMAR_SEMANTICS_EVALUATOR_H_ 19 20 #include "utils/base/arena.h" 21 #include "utils/base/statusor.h" 22 #include "utils/grammar/semantics/eval-context.h" 23 #include "utils/grammar/semantics/expression_generated.h" 24 #include "utils/grammar/semantics/value.h" 25 26 namespace libtextclassifier3::grammar { 27 28 // Interface for a semantic function that evaluates an expression and returns 29 // a semantic value. 30 class SemanticExpressionEvaluator { 31 public: 32 virtual ~SemanticExpressionEvaluator() = default; 33 34 // Applies `expression` to the `context` to produce a semantic value. 35 virtual StatusOr<const SemanticValue*> Apply( 36 const EvalContext& context, const SemanticExpression* expression, 37 UnsafeArena* arena) const = 0; 38 }; 39 40 } // namespace libtextclassifier3::grammar 41 42 #endif // LIBTEXTCLASSIFIER_UTILS_GRAMMAR_SEMANTICS_EVALUATOR_H_ 43