1 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 2 // -*- mode: C++ -*- 3 // 4 // Copyright 2022-2023 Google LLC 5 // 6 // Licensed under the Apache License v2.0 with LLVM Exceptions (the 7 // "License"); you may not use this file except in compliance with the 8 // License. You may obtain a copy of the License at 9 // 10 // https://llvm.org/LICENSE.txt 11 // 12 // Unless required by applicable law or agreed to in writing, software 13 // distributed under the License is distributed on an "AS IS" BASIS, 14 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 // See the License for the specific language governing permissions and 16 // limitations under the License. 17 // 18 // Author: Giuliano Procida 19 20 #ifndef STG_FILTER_H_ 21 #define STG_FILTER_H_ 22 23 #include <memory> 24 #include <ostream> 25 #include <string> 26 27 namespace stg { 28 29 // Abstract base class for filtering. 30 class Filter { 31 public: 32 virtual ~Filter() = default; 33 // Filter predicate evaluation. 34 virtual bool operator()(const std::string& item) const = 0; 35 }; 36 37 // Tokenise and parse a filter expression. 38 std::unique_ptr<Filter> MakeFilter(const std::string& filter); 39 40 void FilterUsage(std::ostream& os); 41 42 } // namespace stg 43 44 #endif // STG_FILTER_H_ 45