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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 // | 4 // |
5 // A JSON parser. Converts strings of JSON into a Value object (see | 5 // A JSON parser. Converts strings of JSON into a Value object (see |
6 // base/values.h). | 6 // base/values.h). |
7 // http://www.ietf.org/rfc/rfc4627.txt?number=4627 | 7 // http://www.ietf.org/rfc/rfc4627.txt?number=4627 |
8 // | 8 // |
9 // Known limitations/deviations from the RFC: | 9 // Known limitations/deviations from the RFC: |
10 // - Only knows how to parse ints within the range of a signed 32 bit int and | 10 // - Only knows how to parse ints within the range of a signed 32 bit int and |
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64 NUMBER, | 64 NUMBER, |
65 BOOL_TRUE, // true | 65 BOOL_TRUE, // true |
66 BOOL_FALSE, // false | 66 BOOL_FALSE, // false |
67 NULL_TOKEN, // null | 67 NULL_TOKEN, // null |
68 LIST_SEPARATOR, // , | 68 LIST_SEPARATOR, // , |
69 OBJECT_PAIR_SEPARATOR, // : | 69 OBJECT_PAIR_SEPARATOR, // : |
70 END_OF_INPUT, | 70 END_OF_INPUT, |
71 INVALID_TOKEN, | 71 INVALID_TOKEN, |
72 }; | 72 }; |
73 | 73 |
74 Token(Type t, const wchar_t* b, int len) | 74 Token(Type t, const char* b, int len) |
75 : type(t), begin(b), length(len) {} | 75 : type(t), begin(b), length(len) {} |
76 | 76 |
77 // Get the character that's one past the end of this token. | 77 // Get the character that's one past the end of this token. |
78 wchar_t NextChar() { | 78 char NextChar() { |
79 return *(begin + length); | 79 return *(begin + length); |
80 } | 80 } |
81 | 81 |
82 static Token CreateInvalidToken() { | 82 static Token CreateInvalidToken() { |
83 return Token(INVALID_TOKEN, 0, 0); | 83 return Token(INVALID_TOKEN, 0, 0); |
84 } | 84 } |
85 | 85 |
86 Type type; | 86 Type type; |
87 | 87 |
88 // A pointer into JSONReader::json_pos_ that's the beginning of this token. | 88 // A pointer into JSONReader::json_pos_ that's the beginning of this token. |
89 const wchar_t* begin; | 89 const char* begin; |
90 | 90 |
91 // End should be one char past the end of the token. | 91 // End should be one char past the end of the token. |
92 int length; | 92 int length; |
93 }; | 93 }; |
94 | 94 |
95 // Error codes during parsing. | 95 // Error codes during parsing. |
96 enum JsonParseError { | 96 enum JsonParseError { |
97 JSON_NO_ERROR = 0, | 97 JSON_NO_ERROR = 0, |
98 JSON_BAD_ROOT_ELEMENT_TYPE, | 98 JSON_BAD_ROOT_ELEMENT_TYPE, |
99 JSON_INVALID_ESCAPE, | 99 JSON_INVALID_ESCAPE, |
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191 Token ParseToken(); | 191 Token ParseToken(); |
192 | 192 |
193 // Increments |json_pos_| past leading whitespace and comments. | 193 // Increments |json_pos_| past leading whitespace and comments. |
194 void EatWhitespaceAndComments(); | 194 void EatWhitespaceAndComments(); |
195 | 195 |
196 // If |json_pos_| is at the start of a comment, eat it, otherwise, returns | 196 // If |json_pos_| is at the start of a comment, eat it, otherwise, returns |
197 // false. | 197 // false. |
198 bool EatComment(); | 198 bool EatComment(); |
199 | 199 |
200 // Checks if |json_pos_| matches str. | 200 // Checks if |json_pos_| matches str. |
201 bool NextStringMatch(const wchar_t* str, size_t length); | 201 bool NextStringMatch(const char* str, size_t length); |
202 | 202 |
203 // Sets the error code that will be returned to the caller. The current | 203 // Sets the error code that will be returned to the caller. The current |
204 // line and column are determined and added into the final message. | 204 // line and column are determined and added into the final message. |
205 void SetErrorCode(const JsonParseError error, const wchar_t* error_pos); | 205 void SetErrorCode(const JsonParseError error, const char* error_pos); |
206 | 206 |
207 // Pointer to the starting position in the input string. | 207 // Pointer to the starting position in the input string. |
208 const wchar_t* start_pos_; | 208 const char* start_pos_; |
209 | 209 |
210 // Pointer to the current position in the input string. | 210 // Pointer to the current position in the input string. |
211 const wchar_t* json_pos_; | 211 const char* json_pos_; |
| 212 |
| 213 // Pointer to the last position in the input string. |
| 214 const char* end_pos_; |
212 | 215 |
213 // Used to keep track of how many nested lists/dicts there are. | 216 // Used to keep track of how many nested lists/dicts there are. |
214 int stack_depth_; | 217 int stack_depth_; |
215 | 218 |
216 // A parser flag that allows trailing commas in objects and arrays. | 219 // A parser flag that allows trailing commas in objects and arrays. |
217 bool allow_trailing_comma_; | 220 bool allow_trailing_comma_; |
218 | 221 |
219 // Contains the error code for the last call to JsonToValue(), if any. | 222 // Contains the error code for the last call to JsonToValue(), if any. |
220 JsonParseError error_code_; | 223 JsonParseError error_code_; |
221 int error_line_; | 224 int error_line_; |
222 int error_col_; | 225 int error_col_; |
223 | 226 |
224 DISALLOW_COPY_AND_ASSIGN(JSONReader); | 227 DISALLOW_COPY_AND_ASSIGN(JSONReader); |
225 }; | 228 }; |
226 | 229 |
227 } // namespace base | 230 } // namespace base |
228 | 231 |
229 #endif // BASE_JSON_JSON_READER_H_ | 232 #endif // BASE_JSON_JSON_READER_H_ |
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