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1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 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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134 | 134 |
135 class V8JavaScriptScanner : public JavaScriptScanner { | 135 class V8JavaScriptScanner : public JavaScriptScanner { |
136 public: | 136 public: |
137 explicit V8JavaScriptScanner(UnicodeCache* unicode_cache) | 137 explicit V8JavaScriptScanner(UnicodeCache* unicode_cache) |
138 : JavaScriptScanner(unicode_cache) {} | 138 : JavaScriptScanner(unicode_cache) {} |
139 | 139 |
140 void Initialize(UC16CharacterStream* source); | 140 void Initialize(UC16CharacterStream* source); |
141 }; | 141 }; |
142 | 142 |
143 | 143 |
144 class JsonScanner : public Scanner { | |
145 public: | |
146 explicit JsonScanner(UnicodeCache* unicode_cache); | |
147 | |
148 void Initialize(UC16CharacterStream* source); | |
149 | |
150 // Returns the next token. | |
151 Token::Value Next(); | |
152 | |
153 // Returns the value of a number token. | |
154 double number() { | |
155 return number_; | |
156 } | |
157 | |
158 | |
159 protected: | |
160 // Skip past JSON whitespace (only space, tab, newline and carrige-return). | |
161 bool SkipJsonWhiteSpace(); | |
162 | |
163 // Scan a single JSON token. The JSON lexical grammar is specified in the | |
164 // ECMAScript 5 standard, section 15.12.1.1. | |
165 // Recognizes all of the single-character tokens directly, or calls a function | |
166 // to scan a number, string or identifier literal. | |
167 // The only allowed whitespace characters between tokens are tab, | |
168 // carriage-return, newline and space. | |
169 void ScanJson(); | |
170 | |
171 // A JSON number (production JSONNumber) is a subset of the valid JavaScript | |
172 // decimal number literals. | |
173 // It includes an optional minus sign, must have at least one | |
174 // digit before and after a decimal point, may not have prefixed zeros (unless | |
175 // the integer part is zero), and may include an exponent part (e.g., "e-10"). | |
176 // Hexadecimal and octal numbers are not allowed. | |
177 Token::Value ScanJsonNumber(); | |
178 | |
179 // A JSON string (production JSONString) is subset of valid JavaScript string | |
180 // literals. The string must only be double-quoted (not single-quoted), and | |
181 // the only allowed backslash-escapes are ", /, \, b, f, n, r, t and | |
182 // four-digit hex escapes (uXXXX). Any other use of backslashes is invalid. | |
183 Token::Value ScanJsonString(); | |
184 | |
185 // Used to recognizes one of the literals "true", "false", or "null". These | |
186 // are the only valid JSON identifiers (productions JSONBooleanLiteral, | |
187 // JSONNullLiteral). | |
188 Token::Value ScanJsonIdentifier(const char* text, Token::Value token); | |
189 | |
190 // Holds the value of a scanned number token. | |
191 double number_; | |
192 }; | |
193 | |
194 } } // namespace v8::internal | 144 } } // namespace v8::internal |
195 | 145 |
196 #endif // V8_SCANNER_H_ | 146 #endif // V8_SCANNER_H_ |
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