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
|
/*
* Copyright (C) 2003-2010 The Music Player Daemon Project
* http://www.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 "config.h"
#include "tokenizer.h"
#include <stdbool.h>
#include <assert.h>
#include <string.h>
G_GNUC_CONST
static GQuark
tokenizer_quark(void)
{
return g_quark_from_static_string("tokenizer");
}
static inline bool
valid_word_first_char(char ch)
{
return g_ascii_isalpha(ch);
}
static inline bool
valid_word_char(char ch)
{
return g_ascii_isalnum(ch) || ch == '_';
}
char *
tokenizer_next_word(char **input_p, GError **error_r)
{
char *word, *input;
assert(input_p != NULL);
assert(*input_p != NULL);
word = input = *input_p;
if (*input == 0)
return NULL;
/* check the first character */
if (!valid_word_first_char(*input)) {
g_set_error(error_r, tokenizer_quark(), 0,
"Letter expected");
return NULL;
}
/* now iterate over the other characters until we find a
whitespace or end-of-string */
while (*++input != 0) {
if (g_ascii_isspace(*input)) {
/* a whitespace: the word ends here */
*input = 0;
/* skip all following spaces, too */
input = g_strchug(input + 1);
break;
}
if (!valid_word_char(*input)) {
*input_p = input;
g_set_error(error_r, tokenizer_quark(), 0,
"Invalid word character");
return NULL;
}
}
/* end of string: the string is already null-terminated
here */
*input_p = input;
return word;
}
static inline bool
valid_unquoted_char(char ch)
{
return (unsigned char)ch > 0x20 && ch != '"' && ch != '\'';
}
char *
tokenizer_next_unquoted(char **input_p, GError **error_r)
{
char *word, *input;
assert(input_p != NULL);
assert(*input_p != NULL);
word = input = *input_p;
if (*input == 0)
return NULL;
/* check the first character */
if (!valid_unquoted_char(*input)) {
g_set_error(error_r, tokenizer_quark(), 0,
"Invalid unquoted character");
return NULL;
}
/* now iterate over the other characters until we find a
whitespace or end-of-string */
while (*++input != 0) {
if (g_ascii_isspace(*input)) {
/* a whitespace: the word ends here */
*input = 0;
/* skip all following spaces, too */
input = g_strchug(input + 1);
break;
}
if (!valid_unquoted_char(*input)) {
*input_p = input;
g_set_error(error_r, tokenizer_quark(), 0,
"Invalid unquoted character");
return NULL;
}
}
/* end of string: the string is already null-terminated
here */
*input_p = input;
return word;
}
char *
tokenizer_next_string(char **input_p, GError **error_r)
{
char *word, *dest, *input;
assert(input_p != NULL);
assert(*input_p != NULL);
word = dest = input = *input_p;
if (*input == 0)
/* end of line */
return NULL;
/* check for the opening " */
if (*input != '"') {
g_set_error(error_r, tokenizer_quark(), 0,
"'\"' expected");
return NULL;
}
++input;
/* copy all characters */
while (*input != '"') {
if (*input == '\\')
/* the backslash escapes the following
character */
++input;
if (*input == 0) {
/* return input-1 so the caller can see the
difference between "end of line" and
"error" */
*input_p = input - 1;
g_set_error(error_r, tokenizer_quark(), 0,
"Missing closing '\"'");
return NULL;
}
/* copy one character */
*dest++ = *input++;
}
/* the following character must be a whitespace (or end of
line) */
++input;
if (*input != 0 && !g_ascii_isspace(*input)) {
*input_p = input;
g_set_error(error_r, tokenizer_quark(), 0,
"Space expected after closing '\"'");
return NULL;
}
/* finish the string and return it */
*dest = 0;
*input_p = g_strchug(input);
return word;
}
char *
tokenizer_next_param(char **input_p, GError **error_r)
{
assert(input_p != NULL);
assert(*input_p != NULL);
if (**input_p == '"')
return tokenizer_next_string(input_p, error_r);
else
return tokenizer_next_unquoted(input_p, error_r);
}
|
