1 // Copyright 2018 Google Inc. All Rights Reserved. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #ifndef NINJA_PARSER_H_ 16 #define NINJA_PARSER_H_ 17 18 #include <string> 19 20 #include "lexer.h" 21 22 struct FileReader; 23 struct State; 24 25 /// Base class for parsers. 26 struct Parser { ParserParser27 Parser(State* state, FileReader* file_reader) 28 : state_(state), file_reader_(file_reader) {} 29 30 /// Load and parse a file. 31 bool Load(const std::string& filename, std::string* err, Lexer* parent = NULL); 32 33 protected: 34 /// If the next token is not \a expected, produce an error string 35 /// saying "expected foo, got bar". 36 bool ExpectToken(Lexer::Token expected, std::string* err); 37 38 State* state_; 39 FileReader* file_reader_; 40 Lexer lexer_; 41 42 private: 43 /// Parse a file, given its contents as a string. 44 virtual bool Parse(const std::string& filename, const std::string& input, 45 std::string* err) = 0; 46 }; 47 48 #endif // NINJA_PARSER_H_ 49