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1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 // | 4 // |
5 // Scanner class for the Dart language. The scanner reads source text | 5 // Scanner class for the Dart language. The scanner reads source text |
6 // and produces a stream of tokens which is used by the parser. | 6 // and produces a stream of tokens which is used by the parser. |
7 // | 7 // |
8 | 8 |
9 #ifndef VM_SCANNER_H_ | 9 #ifndef VM_SCANNER_H_ |
10 #define VM_SCANNER_H_ | 10 #define VM_SCANNER_H_ |
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34 // TokenDesc defines the kind of a token and its location in | 34 // TokenDesc defines the kind of a token and its location in |
35 // the source text. | 35 // the source text. |
36 struct TokenDescriptor { | 36 struct TokenDescriptor { |
37 Token::Kind kind; | 37 Token::Kind kind; |
38 int offset; // Offset in source string. | 38 int offset; // Offset in source string. |
39 int length; // Length of token in source. | 39 int length; // Length of token in source. |
40 SourcePosition position; // Text position in source. | 40 SourcePosition position; // Text position in source. |
41 String* literal; // Identifier, number or string literal. | 41 String* literal; // Identifier, number or string literal. |
42 }; | 42 }; |
43 | 43 |
| 44 // Dummy token index reflecting an unknown source position. |
| 45 static const intptr_t kDummyTokenIndex = 0; |
| 46 |
44 // Character used to indicate a private identifier. | 47 // Character used to indicate a private identifier. |
45 static const char kPrivateIdentifierStart = '_'; | 48 static const char kPrivateIdentifierStart = '_'; |
46 | 49 |
47 // Character used to separate the private identifier from the key. | 50 // Character used to separate the private identifier from the key. |
48 static const char kPrivateKeySeparator = '@'; | 51 static const char kPrivateKeySeparator = '@'; |
49 | 52 |
50 typedef ZoneGrowableArray<TokenDescriptor> GrowableTokenStream; | 53 typedef ZoneGrowableArray<TokenDescriptor> GrowableTokenStream; |
51 | 54 |
52 // Initializes scanner to scan string source. | 55 // Initializes scanner to scan string source. |
53 Scanner(const String& source, const String& private_key); | 56 Scanner(const String& source, const String& private_key); |
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206 const String& private_key_; | 209 const String& private_key_; |
207 | 210 |
208 SourcePosition c0_pos_; // Source position of lookahead character c0_. | 211 SourcePosition c0_pos_; // Source position of lookahead character c0_. |
209 KeywordTable keywords_[Token::numKeywords]; | 212 KeywordTable keywords_[Token::numKeywords]; |
210 }; | 213 }; |
211 | 214 |
212 | 215 |
213 } // namespace dart | 216 } // namespace dart |
214 | 217 |
215 #endif // VM_SCANNER_H_ | 218 #endif // VM_SCANNER_H_ |
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