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 using namespace std; 21 22 #include "lexer.h" 23 24 struct FileReader; 25 struct State; 26 27 /// Base class for parsers. 28 struct Parser { ParserParser29 Parser(State* state, FileReader* file_reader) 30 : state_(state), file_reader_(file_reader) {} 31 32 /// Load and parse a file. 33 bool Load(const string& filename, string* err, Lexer* parent = NULL); 34 35 protected: 36 /// If the next token is not \a expected, produce an error string 37 /// saying "expected foo, got bar". 38 bool ExpectToken(Lexer::Token expected, string* err); 39 40 State* state_; 41 FileReader* file_reader_; 42 Lexer lexer_; 43 44 private: 45 /// Parse a file, given its contents as a string. 46 virtual bool Parse(const string& filename, const string& input, 47 string* err) = 0; 48 }; 49 50 #endif // NINJA_PARSER_H_ 51