Ninja
manifest_parser.h
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00001 // Copyright 2011 Google Inc. All Rights Reserved.
00002 //
00003 // Licensed under the Apache License, Version 2.0 (the "License");
00004 // you may not use this file except in compliance with the License.
00005 // You may obtain a copy of the License at
00006 //
00007 //     http://www.apache.org/licenses/LICENSE-2.0
00008 //
00009 // Unless required by applicable law or agreed to in writing, software
00010 // distributed under the License is distributed on an "AS IS" BASIS,
00011 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00012 // See the License for the specific language governing permissions and
00013 // limitations under the License.
00014 
00015 #ifndef NINJA_MANIFEST_PARSER_H_
00016 #define NINJA_MANIFEST_PARSER_H_
00017 
00018 #include <string>
00019 
00020 using namespace std;
00021 
00022 #include "lexer.h"
00023 
00024 struct BindingEnv;
00025 struct EvalString;
00026 struct State;
00027 
00028 /// Parses .ninja files.
00029 struct ManifestParser {
00030   struct FileReader {
00031     virtual ~FileReader() {}
00032     virtual bool ReadFile(const string& path, string* content, string* err) = 0;
00033   };
00034 
00035   ManifestParser(State* state, FileReader* file_reader);
00036 
00037   /// Load and parse a file.
00038   bool Load(const string& filename, string* err);
00039 
00040   /// Parse a text string of input.  Used by tests.
00041   bool ParseTest(const string& input, string* err) {
00042     return Parse("input", input, err);
00043   }
00044 
00045 private:
00046   /// Parse a file, given its contents as a string.
00047   bool Parse(const string& filename, const string& input, string* err);
00048 
00049   /// Parse various statement types.
00050   bool ParsePool(string* err);
00051   bool ParseRule(string* err);
00052   bool ParseLet(string* key, EvalString* val, string* err);
00053   bool ParseEdge(string* err);
00054   bool ParseDefault(string* err);
00055 
00056   /// Parse either a 'subninja' or 'include' line.
00057   bool ParseFileInclude(bool new_scope, string* err);
00058 
00059   /// If the next token is not \a expected, produce an error string
00060   /// saying "expectd foo, got bar".
00061   bool ExpectToken(Lexer::Token expected, string* err);
00062 
00063   State* state_;
00064   BindingEnv* env_;
00065   FileReader* file_reader_;
00066   Lexer lexer_;
00067 };
00068 
00069 #endif  // NINJA_MANIFEST_PARSER_H_