1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "base/json_writer.h"
#include "base/logging.h"
#include "base/string_util.h"
#include "base/values.h"
#include "base/string_escape.h"
const char kPrettyPrintLineEnding[] = "\r\n";
/* static */
void JSONWriter::Write(const Value* const node, bool pretty_print,
std::string* json) {
json->clear();
// Is there a better way to estimate the size of the output?
json->reserve(1024);
JSONWriter writer(pretty_print, json);
writer.BuildJSONString(node, 0);
if (pretty_print)
json->append(kPrettyPrintLineEnding);
}
JSONWriter::JSONWriter(bool pretty_print, std::string* json)
: pretty_print_(pretty_print),
json_string_(json) {
DCHECK(json);
}
void JSONWriter::BuildJSONString(const Value* const node, int depth) {
switch(node->GetType()) {
case Value::TYPE_NULL:
json_string_->append("null");
break;
case Value::TYPE_BOOLEAN:
{
bool value;
bool result = node->GetAsBoolean(&value);
DCHECK(result);
json_string_->append(value ? "true" : "false");
break;
}
case Value::TYPE_INTEGER:
{
int value;
bool result = node->GetAsInteger(&value);
DCHECK(result);
StringAppendF(json_string_, "%d", value);
break;
}
case Value::TYPE_REAL:
{
double value;
bool result = node->GetAsReal(&value);
DCHECK(result);
std::string real = StringPrintf("%g", value);
// Ensure that the number has a .0 if there's no decimal or 'e'. This
// makes sure that when we read the JSON back, it's interpreted as a
// real rather than an int.
if (real.find('.') == std::string::npos &&
real.find('e') == std::string::npos &&
real.find('E') == std::string::npos) {
real.append(".0");
}
json_string_->append(real);
break;
}
case Value::TYPE_STRING:
{
std::wstring value;
bool result = node->GetAsString(&value);
DCHECK(result);
AppendQuotedString(value);
break;
}
case Value::TYPE_LIST:
{
json_string_->append("[");
if (pretty_print_)
json_string_->append(" ");
const ListValue* list = static_cast<const ListValue*>(node);
for (size_t i = 0; i < list->GetSize(); ++i) {
if (i != 0) {
json_string_->append(",");
if (pretty_print_)
json_string_->append(" ");
}
Value* value = NULL;
bool result = list->Get(i, &value);
DCHECK(result);
BuildJSONString(value, depth);
}
if (pretty_print_)
json_string_->append(" ");
json_string_->append("]");
break;
}
case Value::TYPE_DICTIONARY:
{
json_string_->append("{");
if (pretty_print_)
json_string_->append(kPrettyPrintLineEnding);
const DictionaryValue* dict =
static_cast<const DictionaryValue*>(node);
for (DictionaryValue::key_iterator key_itr = dict->begin_keys();
key_itr != dict->end_keys();
++key_itr) {
if (key_itr != dict->begin_keys()) {
json_string_->append(",");
if (pretty_print_)
json_string_->append(kPrettyPrintLineEnding);
}
Value* value = NULL;
bool result = dict->Get(*key_itr, &value);
DCHECK(result);
if (pretty_print_)
IndentLine(depth + 1);
AppendQuotedString(*key_itr);
if (pretty_print_) {
json_string_->append(": ");
} else {
json_string_->append(":");
}
BuildJSONString(value, depth + 1);
}
if (pretty_print_) {
json_string_->append(kPrettyPrintLineEnding);
IndentLine(depth);
json_string_->append("}");
} else {
json_string_->append("}");
}
break;
}
default:
// TODO(jhughes): handle TYPE_BINARY
NOTREACHED() << "unknown json type";
}
}
void JSONWriter::AppendQuotedString(const std::wstring& str) {
string_escape::JavascriptDoubleQuote(str, true, json_string_);
}
void JSONWriter::IndentLine(int depth) {
// It may be faster to keep an indent string so we don't have to keep
// reallocating.
json_string_->append(std::string(depth * 3, ' '));
}
|
