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
|
//-----------------------------------------------------------------------------
/** @file libboardgame_base/Reader.cpp
@author Markus Enzenberger
@copyright GNU General Public License version 3 or later */
//-----------------------------------------------------------------------------
#include "Reader.h"
#include <cctype>
#include <cstdio>
#include <fstream>
#include "Assert.h"
namespace libboardgame_base {
//-----------------------------------------------------------------------------
namespace {
/** Replacement for std::isspace() that returns true only for whitespaces
in the ASCII range. */
bool is_ascii_space(int c)
{
return c >= 0 && c < 128 && isspace(c) != 0;
}
} // namespace
//-----------------------------------------------------------------------------
void Reader::consume_char([[maybe_unused]] char expected)
{
[[maybe_unused]] char c = read_char();
LIBBOARDGAME_ASSERT(c == expected);
}
void Reader::consume_whitespace()
{
while (is_ascii_space(peek()))
m_in->get();
}
void Reader::on_begin_node([[maybe_unused]] bool is_root)
{
// Default implementation does nothing
}
void Reader::on_begin_tree([[maybe_unused]] bool is_root)
{
// Default implementation does nothing
}
void Reader::on_end_node()
{
// Default implementation does nothing
}
void Reader::on_end_tree([[maybe_unused]] bool is_root)
{
// Default implementation does nothing
}
void Reader::on_property([[maybe_unused]] const string& id,
[[maybe_unused]] const vector<string>& values)
{
// Default implementation does nothing
}
char Reader::peek()
{
int c = m_in->peek();
if (c == EOF)
throw ReadError("Unexpected end of input");
return char(c);
}
bool Reader::read(istream& in, bool check_single_tree)
{
m_in = ∈
consume_whitespace();
read_tree(true);
while (true)
{
int c = m_in->peek();
if (c == EOF)
return false;
if (c == '(')
{
if (check_single_tree)
throw ReadError("Input has multiple game trees");
return true;
}
if (is_ascii_space(c))
m_in->get();
else
return false;
}
}
void Reader::read(const string& file)
{
ifstream in(file);
if (! in)
throw ReadError("Could not open '" + file + "'");
try
{
read(in);
}
catch (const ReadError& e)
{
throw ReadError("Could not read '" + file + "': " + e.what());
}
}
char Reader::read_char()
{
int c = m_in->get();
if (c == EOF)
throw ReadError("Unexpected end of SGF stream");
if (c == '\r')
{
// Convert CR+LF or single CR into LF
if (peek() == '\n')
m_in->get();
return '\n';
}
return char(c);
}
void Reader::read_expected(char expected)
{
if (read_char() != expected)
throw ReadError(string("Expected '") + expected + "'");
}
void Reader::read_node(bool is_root)
{
read_expected(';');
on_begin_node(is_root);
while (true)
{
consume_whitespace();
char c = peek();
if (c == '(' || c == ')' || c == ';')
break;
read_property();
}
on_end_node();
}
void Reader::read_property()
{
m_id.clear();
while (peek() != '[')
{
char c = read_char();
if (! is_ascii_space(c))
m_id += c;
}
m_values.clear();
while (peek() == '[')
{
consume_char('[');
m_value.clear();
bool escape = false;
while (peek() != ']' || escape)
{
char c = read_char();
if (c == '\\' && ! escape)
{
escape = true;
continue;
}
escape = false;
m_value += c;
}
consume_char(']');
consume_whitespace();
m_values.push_back(m_value);
}
on_property(m_id, m_values);
}
void Reader::read_tree(bool is_root)
{
read_expected('(');
on_begin_tree(is_root);
bool was_root = is_root;
while (true)
{
consume_whitespace();
char c = peek();
if (c == ')')
break;
if (c == ';')
{
read_node(is_root);
is_root = false;
}
else if (c == '(')
read_tree(false);
else
throw ReadError("Extra text before node");
}
read_expected(')');
on_end_tree(was_root);
}
//-----------------------------------------------------------------------------
} // namespace libboardgame_base
|
