| // Copyright 2020 Google LLC |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| // |
| |
| #ifndef LIBTEXTCLASSIFIER_UTILS_GRAMMAR_SEMANTICS_EVALUATOR_H_ |
| #define LIBTEXTCLASSIFIER_UTILS_GRAMMAR_SEMANTICS_EVALUATOR_H_ |
| |
| #include "utils/base/arena.h" |
| #include "utils/base/statusor.h" |
| #include "utils/grammar/semantics/eval-context.h" |
| #include "utils/grammar/semantics/expression_generated.h" |
| #include "utils/grammar/semantics/value.h" |
| |
| namespace libtextclassifier3::grammar { |
| |
| // Interface for a semantic function that evaluates an expression and returns |
| // a semantic value. |
| class SemanticExpressionEvaluator { |
| public: |
| virtual ~SemanticExpressionEvaluator() = default; |
| |
| // Applies `expression` to the `context` to produce a semantic value. |
| virtual StatusOr<const SemanticValue*> Apply( |
| const EvalContext& context, const SemanticExpression* expression, |
| UnsafeArena* arena) const = 0; |
| }; |
| |
| } // namespace libtextclassifier3::grammar |
| |
| #endif // LIBTEXTCLASSIFIER_UTILS_GRAMMAR_SEMANTICS_EVALUATOR_H_ |
