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 3 // found in the LICENSE file. 4 5 #ifndef BASE_JSON_JSON_WRITER_H_ 6 #define BASE_JSON_JSON_WRITER_H_ 7 #pragma once 8 9 #include <string> 10 11 #include "base/base_api.h" 12 #include "base/basictypes.h" 13 14 class Value; 15 16 namespace base { 17 18 class BASE_API JSONWriter { 19 public: 20 // Given a root node, generates a JSON string and puts it into |json|. 21 // If |pretty_print| is true, return a slightly nicer formated json string 22 // (pads with whitespace to help readability). If |pretty_print| is false, 23 // we try to generate as compact a string as possible. 24 // TODO(tc): Should we generate json if it would be invalid json (e.g., 25 // |node| is not a DictionaryValue/ListValue or if there are inf/-inf float 26 // values)? 27 static void Write(const Value* const node, bool pretty_print, 28 std::string* json); 29 30 // Same as above, but has an option to not escape the string, preserving its 31 // UTF8 characters. It is useful if you can pass resulting string to the 32 // JSON parser in binary form (as UTF8). 33 static void WriteWithOptionalEscape(const Value* const node, 34 bool pretty_print, 35 bool escape, 36 std::string* json); 37 38 // A static, constant JSON string representing an empty array. Useful 39 // for empty JSON argument passing. 40 static const char* kEmptyArray; 41 42 private: 43 JSONWriter(bool pretty_print, std::string* json); 44 45 // Called recursively to build the JSON string. Whe completed, value is 46 // json_string_ will contain the JSON. 47 void BuildJSONString(const Value* const node, int depth, bool escape); 48 49 // Appends a quoted, escaped, version of (UTF-8) str to json_string_. 50 void AppendQuotedString(const std::string& str); 51 52 // Adds space to json_string_ for the indent level. 53 void IndentLine(int depth); 54 55 // Where we write JSON data as we generate it. 56 std::string* json_string_; 57 58 bool pretty_print_; 59 60 DISALLOW_COPY_AND_ASSIGN(JSONWriter); 61 }; 62 63 } // namespace base 64 65 #endif // BASE_JSON_JSON_WRITER_H_ 66
