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Side by Side Diff: base/json/json_reader.h

Issue 316016: Move the json-related files into a separate json directory. This hopefully al... (Closed) Base URL: svn://chrome-svn/chrome/trunk/src/
Patch Set: '' Created 11 years, 2 months ago
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Added: svn:mergeinfo
Merged /branches/chrome_webkit_merge_branch/base/json_reader.h:r69-2775
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1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2006-2008 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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21 // character, the function skips a Unicode BOM at the beginning of the 21 // character, the function skips a Unicode BOM at the beginning of the
22 // Unicode string (converted from the input UTF-8 string) before parsing it. 22 // Unicode string (converted from the input UTF-8 string) before parsing it.
23 // 23 //
24 // TODO(tc): Add a parsing option to to relax object keys being wrapped in 24 // TODO(tc): Add a parsing option to to relax object keys being wrapped in
25 // double quotes 25 // double quotes
26 // TODO(tc): Add an option to disable comment stripping 26 // TODO(tc): Add an option to disable comment stripping
27 // TODO(aa): Consider making the constructor public and the static Read() method 27 // TODO(aa): Consider making the constructor public and the static Read() method
28 // only a convenience for the common uses with more complex configuration going 28 // only a convenience for the common uses with more complex configuration going
29 // on the instance. 29 // on the instance.
30 30
31 #ifndef BASE_JSON_READER_H_ 31 #ifndef BASE_JSON_JSON_READER_H_
32 #define BASE_JSON_READER_H_ 32 #define BASE_JSON_JSON_READER_H_
33 33
34 #include <string> 34 #include <string>
35 35
36 #include "base/basictypes.h" 36 #include "base/basictypes.h"
37 #include "testing/gtest/include/gtest/gtest_prod.h" 37 #include "testing/gtest/include/gtest/gtest_prod.h"
38 38
39 class Value; 39 class Value;
40 40
41 namespace base {
42
41 class JSONReader { 43 class JSONReader {
42 public: 44 public:
43 // A struct to hold a JS token. 45 // A struct to hold a JS token.
44 class Token { 46 class Token {
45 public: 47 public:
46 enum Type { 48 enum Type {
47 OBJECT_BEGIN, // { 49 OBJECT_BEGIN, // {
48 OBJECT_END, // } 50 OBJECT_END, // }
49 ARRAY_BEGIN, // [ 51 ARRAY_BEGIN, // [
50 ARRAY_END, // ] 52 ARRAY_END, // ]
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112 // array. Otherwise, it can be any valid JSON type. 114 // array. Otherwise, it can be any valid JSON type.
113 // If |allow_trailing_comma| is true, we will ignore trailing commas in 115 // If |allow_trailing_comma| is true, we will ignore trailing commas in
114 // objects and arrays even though this goes against the RFC. 116 // objects and arrays even though this goes against the RFC.
115 Value* JsonToValue(const std::string& json, bool check_root, 117 Value* JsonToValue(const std::string& json, bool check_root,
116 bool allow_trailing_comma); 118 bool allow_trailing_comma);
117 119
118 private: 120 private:
119 static std::string FormatErrorMessage(int line, int column, 121 static std::string FormatErrorMessage(int line, int column,
120 const char* description); 122 const char* description);
121 123
122 DISALLOW_EVIL_CONSTRUCTORS(JSONReader); 124 DISALLOW_COPY_AND_ASSIGN(JSONReader);
123 125
124 FRIEND_TEST(JSONReaderTest, Reading); 126 FRIEND_TEST(JSONReaderTest, Reading);
125 FRIEND_TEST(JSONReaderTest, ErrorMessages); 127 FRIEND_TEST(JSONReaderTest, ErrorMessages);
126 128
127 // Recursively build Value. Returns NULL if we don't have a valid JSON 129 // Recursively build Value. Returns NULL if we don't have a valid JSON
128 // string. If |is_root| is true, we verify that the root element is either 130 // string. If |is_root| is true, we verify that the root element is either
129 // an object or an array. 131 // an object or an array.
130 Value* BuildValue(bool is_root); 132 Value* BuildValue(bool is_root);
131 133
132 // Parses a sequence of characters into a Token::NUMBER. If the sequence of 134 // Parses a sequence of characters into a Token::NUMBER. If the sequence of
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176 // Used to keep track of how many nested lists/dicts there are. 178 // Used to keep track of how many nested lists/dicts there are.
177 int stack_depth_; 179 int stack_depth_;
178 180
179 // A parser flag that allows trailing commas in objects and arrays. 181 // A parser flag that allows trailing commas in objects and arrays.
180 bool allow_trailing_comma_; 182 bool allow_trailing_comma_;
181 183
182 // Contains the error message for the last call to JsonToValue(), if any. 184 // Contains the error message for the last call to JsonToValue(), if any.
183 std::string error_message_; 185 std::string error_message_;
184 }; 186 };
185 187
186 #endif // BASE_JSON_READER_H_ 188 } // namespace base
189
190 #endif // BASE_JSON_JSON_READER_H_
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