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
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
|
// ----------------------------------------------------------------------------
// Copyright (C) 2002-2006 Marcin Kalicinski
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// For more information, see www.boost.org
// ----------------------------------------------------------------------------
#ifndef BOOST_PROPERTY_TREE_DETAIL_JSON_PARSER_READ_HPP_INCLUDED
#define BOOST_PROPERTY_TREE_DETAIL_JSON_PARSER_READ_HPP_INCLUDED
//#define BOOST_SPIRIT_DEBUG
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/detail/ptree_utils.hpp>
#include <boost/property_tree/detail/json_parser_error.hpp>
#include <boost/spirit/include/classic.hpp>
#include <boost/limits.hpp>
#include <string>
#include <locale>
#include <istream>
#include <vector>
#include <algorithm>
namespace boost { namespace property_tree { namespace json_parser
{
///////////////////////////////////////////////////////////////////////
// Json parser context
template<class Ptree>
struct context
{
typedef typename Ptree::key_type::value_type Ch;
typedef std::basic_string<Ch> Str;
typedef typename std::vector<Ch>::iterator It;
Str string;
Str name;
Ptree root;
std::vector<Ptree *> stack;
struct a_object_s
{
context &c;
a_object_s(context &c): c(c) { }
void operator()(Ch) const
{
if (c.stack.empty())
c.stack.push_back(&c.root);
else
{
Ptree *parent = c.stack.back();
Ptree *child = &parent->push_back(std::make_pair(c.name, Ptree()))->second;
c.stack.push_back(child);
c.name.clear();
}
}
};
struct a_object_e
{
context &c;
a_object_e(context &c): c(c) { }
void operator()(Ch) const
{
BOOST_ASSERT(c.stack.size() >= 1);
c.stack.pop_back();
}
};
struct a_name
{
context &c;
a_name(context &c): c(c) { }
void operator()(It, It) const
{
c.name.swap(c.string);
c.string.clear();
}
};
struct a_string_val
{
context &c;
a_string_val(context &c): c(c) { }
void operator()(It, It) const
{
BOOST_ASSERT(c.stack.size() >= 1);
c.stack.back()->push_back(std::make_pair(c.name, Ptree(c.string)));
c.name.clear();
c.string.clear();
}
};
struct a_literal_val
{
context &c;
a_literal_val(context &c): c(c) { }
void operator()(It b, It e) const
{
BOOST_ASSERT(c.stack.size() >= 1);
c.stack.back()->push_back(std::make_pair(c.name,
Ptree(Str(b, e))));
c.name.clear();
c.string.clear();
}
};
struct a_char
{
context &c;
a_char(context &c): c(c) { }
void operator()(It b, It e) const
{
c.string += *b;
}
};
struct a_escape
{
context &c;
a_escape(context &c): c(c) { }
void operator()(Ch ch) const
{
switch (ch)
{
case Ch('\"'): c.string += Ch('\"'); break;
case Ch('\\'): c.string += Ch('\\'); break;
case Ch('/'): c.string += Ch('/'); break;
case Ch('b'): c.string += Ch('\b'); break;
case Ch('f'): c.string += Ch('\f'); break;
case Ch('n'): c.string += Ch('\n'); break;
case Ch('r'): c.string += Ch('\r'); break;
case Ch('t'): c.string += Ch('\t'); break;
default: BOOST_ASSERT(0);
}
}
};
struct a_unicode
{
context &c;
a_unicode(context &c): c(c) { }
void operator()(unsigned long u) const
{
//u = (std::min)(u, static_cast<unsigned long>((std::numeric_limits<Ch>::max)()));
c.string += Ch(u);
}
};
};
///////////////////////////////////////////////////////////////////////
// Json grammar
template<class Ptree>
struct json_grammar :
public boost::spirit::classic::grammar<json_grammar<Ptree> >
{
typedef context<Ptree> Context;
typedef typename Ptree::key_type::value_type Ch;
mutable Context c;
template<class Scanner>
struct definition
{
boost::spirit::classic::rule<Scanner>
root, object, member, array, item, value, string, number;
boost::spirit::classic::rule<
typename boost::spirit::classic::lexeme_scanner<Scanner>::type>
character, escape;
definition(const json_grammar &self)
{
using namespace boost::spirit::classic;
// There's a boost::assertion too, so another explicit using
// here:
using boost::spirit::classic::assertion;
// Assertions
assertion<std::string> expect_root("expected object or array");
assertion<std::string> expect_eoi("expected end of input");
assertion<std::string> expect_objclose("expected ',' or '}'");
assertion<std::string> expect_arrclose("expected ',' or ']'");
assertion<std::string> expect_name("expected object name");
assertion<std::string> expect_colon("expected ':'");
assertion<std::string> expect_value("expected value");
assertion<std::string> expect_escape("invalid escape sequence");
// JSON grammar rules
root
= expect_root(object | array)
>> expect_eoi(end_p)
;
object
= ch_p('{')[typename Context::a_object_s(self.c)]
>> (ch_p('}')[typename Context::a_object_e(self.c)]
| (list_p(member, ch_p(','))
>> expect_objclose(ch_p('}')[typename Context::a_object_e(self.c)])
)
)
;
member
= expect_name(string[typename Context::a_name(self.c)])
>> expect_colon(ch_p(':'))
>> expect_value(value)
;
array
= ch_p('[')[typename Context::a_object_s(self.c)]
>> (ch_p(']')[typename Context::a_object_e(self.c)]
| (list_p(item, ch_p(','))
>> expect_arrclose(ch_p(']')[typename Context::a_object_e(self.c)])
)
)
;
item
= expect_value(value)
;
value
= string[typename Context::a_string_val(self.c)]
| (number | str_p("true") | "false" | "null")[typename Context::a_literal_val(self.c)]
| object
| array
;
number
= !ch_p("-") >>
(ch_p("0") | (range_p(Ch('1'), Ch('9')) >> *digit_p)) >>
!(ch_p(".") >> +digit_p) >>
!(chset_p(detail::widen<Ch>("eE").c_str()) >>
!chset_p(detail::widen<Ch>("-+").c_str()) >>
+digit_p)
;
string
= +(lexeme_d[confix_p('\"', *character, '\"')])
;
character
= (anychar_p - "\\" - "\"")
[typename Context::a_char(self.c)]
| ch_p("\\") >> expect_escape(escape)
;
escape
= chset_p(detail::widen<Ch>("\"\\/bfnrt").c_str())
[typename Context::a_escape(self.c)]
| 'u' >> uint_parser<unsigned long, 16, 4, 4>()
[typename Context::a_unicode(self.c)]
;
// Debug
BOOST_SPIRIT_DEBUG_RULE(root);
BOOST_SPIRIT_DEBUG_RULE(object);
BOOST_SPIRIT_DEBUG_RULE(member);
BOOST_SPIRIT_DEBUG_RULE(array);
BOOST_SPIRIT_DEBUG_RULE(item);
BOOST_SPIRIT_DEBUG_RULE(value);
BOOST_SPIRIT_DEBUG_RULE(string);
BOOST_SPIRIT_DEBUG_RULE(number);
BOOST_SPIRIT_DEBUG_RULE(escape);
BOOST_SPIRIT_DEBUG_RULE(character);
}
const boost::spirit::classic::rule<Scanner> &start() const
{
return root;
}
};
};
template<class It, class Ch>
unsigned long count_lines(It begin, It end)
{
return static_cast<unsigned long>(std::count(begin, end, Ch('\n')) + 1);
}
template<class Ptree>
void read_json_internal(std::basic_istream<typename Ptree::key_type::value_type> &stream,
Ptree &pt,
const std::string &filename)
{
using namespace boost::spirit::classic;
typedef typename Ptree::key_type::value_type Ch;
typedef typename std::vector<Ch>::iterator It;
// Load data into vector
std::vector<Ch> v(std::istreambuf_iterator<Ch>(stream.rdbuf()),
std::istreambuf_iterator<Ch>());
if (!stream.good())
BOOST_PROPERTY_TREE_THROW(json_parser_error("read error", filename, 0));
// Prepare grammar
json_grammar<Ptree> g;
// Parse
try
{
parse_info<It> pi = parse(v.begin(), v.end(), g,
space_p | comment_p("//") | comment_p("/*", "*/"));
if (!pi.hit || !pi.full)
BOOST_PROPERTY_TREE_THROW((parser_error<std::string, It>(v.begin(), "syntax error")));
}
catch (parser_error<std::string, It> &e)
{
BOOST_PROPERTY_TREE_THROW(json_parser_error(e.descriptor, filename, count_lines<It, Ch>(v.begin(), e.where)));
}
// Swap grammar context root and pt
pt.swap(g.c.root);
}
} } }
#endif
|
