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
|
/* mpdscribble (MPD Client)
* Copyright (C) 2008-2019 The Music Player Daemon Project
* Project homepage: http://musicpd.org
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "IniFile.hxx"
#include "system/Error.hxx"
#include "util/CharUtil.hxx"
#include "util/RuntimeError.hxx"
#include "util/ScopeExit.hxx"
#include "util/StringStrip.hxx"
#include "util/StringView.hxx"
#include <stdio.h>
static constexpr bool
IsValidSectionNameChar(char ch) noexcept
{
return IsAlphaNumericASCII(ch) || ch == '_' || ch == '-' || ch == '.';
}
[[gnu::pure]]
static bool
IsValidSectionName(StringView name) noexcept
{
if (name.empty())
return false;
for (char ch : name)
if (!IsValidSectionNameChar(ch))
return false;
return true;
}
static constexpr bool
IsValidKeyChar(char ch) noexcept
{
return IsAlphaNumericASCII(ch) || ch == '_';
}
[[gnu::pure]]
static bool
IsValidKey(StringView name) noexcept
{
if (name.empty())
return false;
for (char ch : name)
if (!IsValidKeyChar(ch))
return false;
return true;
}
namespace {
class IniParser {
IniFile data;
IniFile::iterator section;
public:
void ParseLine(char *line);
auto Commit() noexcept {
return std::move(data);
}
};
void
IniParser::ParseLine(char *line)
{
line = Strip(line);
if (*line == 0 || *line == '#')
/* ignore empty lines and comments */
return;
if (*line == '[') {
/* a new section */
line = StripLeft(line + 1);
char *end = strchr(line, ']');
if (end == nullptr)
throw std::runtime_error("Missing ']'");
StringView name(line, end);
name.StripRight();
if (!IsValidSectionName(name))
throw std::runtime_error("Invalid section name");
line = end + 1;
if (*line != 0)
throw std::runtime_error("Garbage after section");
auto i = data.emplace(std::string(name.data, name.size),
IniSection());
if (!i.second)
throw FormatRuntimeError("Duplicate section name: %.*s",
int(name.size), name.data);
section = i.first;
} else if (IsValidKeyChar(*line)) {
char *eq = strchr(line, '=');
if (eq == nullptr)
throw std::runtime_error("Missing '='");
StringView key(line, eq);
key.StripRight();
if (!IsValidKey(key))
throw std::runtime_error("Invalid key");
StringView value(eq + 1);
value.StripLeft();
// TODO: support quoted values
if (data.empty())
section = data.emplace(std::string(),
IniSection()).first;
auto i = section->second.emplace(std::string(key.data, key.size),
std::string(value.data, value.size));
if (!i.second)
throw FormatRuntimeError("Duplicate key: %.*s",
int(key.size), key.data);
} else
throw std::runtime_error("Syntax error");
}
}
static IniFile
ReadIniFile(const char *path, FILE *file)
{
IniParser parser;
unsigned no = 1;
char buffer[4096];
while (auto line = fgets(buffer, sizeof(buffer), file)) {
try {
parser.ParseLine(line);
} catch (...) {
std::throw_with_nested(FormatRuntimeError("Error on %s line %u",
path, no));
}
++no;
}
return parser.Commit();
}
IniFile
ReadIniFile(const char *path)
{
FILE *file = fopen(path, "r");
if (file == nullptr)
throw FormatErrno("Failed to open %s", path);
AtScopeExit(file) { fclose(file); };
return ReadIniFile(path, file);
}
|
