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
22struct FileReader;
23struct State;
24
25/// Base class for parsers.
26struct Parser {
27 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
33protected:
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
42private:
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