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1 // Copyright 2010 the V8 project authors. All rights reserved. | 1 // Copyright 2010 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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92 | 92 |
93 | 93 |
94 // Interface for a stream of Unicode characters. | 94 // Interface for a stream of Unicode characters. |
95 class UnicodeInputStream { | 95 class UnicodeInputStream { |
96 public: | 96 public: |
97 virtual ~UnicodeInputStream(); | 97 virtual ~UnicodeInputStream(); |
98 | 98 |
99 // Returns the next Unicode code-point in the input, or a negative value when | 99 // Returns the next Unicode code-point in the input, or a negative value when |
100 // there is no more input in the stream. | 100 // there is no more input in the stream. |
101 virtual int32_t Next() = 0; | 101 virtual int32_t Next() = 0; |
| 102 |
| 103 // Pushes a read character back into the stream, so that it will be the next |
| 104 // to be read by Advance(). The character pushed back must be the most |
| 105 // recently read character that hasn't already been pushed back (i.e., if |
| 106 // pushing back more than one character, they must occur in the opposite order |
| 107 // of the one they were read in). |
| 108 virtual void PushBack(int32_t ch) = 0; |
102 }; | 109 }; |
103 | 110 |
104 | 111 |
105 // Preparse a JavaScript program. The source code is provided as a | 112 // Preparse a JavaScript program. The source code is provided as a |
106 // UnicodeInputStream. The max_stack_size limits the amount of stack | 113 // UnicodeInputStream. The max_stack_size limits the amount of stack |
107 // space that the preparser is allowed to use. If the preparser uses | 114 // space that the preparser is allowed to use. If the preparser uses |
108 // more stack space than the limit provided, the result's stack_overflow() | 115 // more stack space than the limit provided, the result's stack_overflow() |
109 // method will return true. Otherwise the result contains preparser | 116 // method will return true. Otherwise the result contains preparser |
110 // data that can be used by the V8 parser to speed up parsing. | 117 // data that can be used by the V8 parser to speed up parsing. |
111 PreParserData V8EXPORT Preparse(UnicodeInputStream* input, | 118 PreParserData V8EXPORT Preparse(UnicodeInputStream* input, |
112 size_t max_stack_size); | 119 size_t max_stack_size); |
113 | 120 |
114 } // namespace v8. | 121 } // namespace v8. |
115 | 122 |
116 #endif // PREPARSER_H | 123 #endif // PREPARSER_H |
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