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
|
/*
* Copyright (C) 2009-2014 Max Kellermann <max.kellermann@gmail.com>
*
* 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.
*
* 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
* FOUNDATION 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 "config.h"
#include "Tokenizer.hxx"
#include "CharUtil.hxx"
#include "StringStrip.hxx"
#include <stdexcept>
static inline bool
valid_word_first_char(char ch)
{
return IsAlphaASCII(ch);
}
static inline bool
valid_word_char(char ch)
{
return IsAlphaNumericASCII(ch) || ch == '_';
}
char *
Tokenizer::NextWord()
{
char *const word = input;
if (*input == 0)
return nullptr;
/* check the first character */
if (!valid_word_first_char(*input))
throw std::runtime_error("Letter expected");
/* now iterate over the other characters until we find a
whitespace or end-of-string */
while (*++input != 0) {
if (IsWhitespaceFast(*input)) {
/* a whitespace: the word ends here */
*input = 0;
/* skip all following spaces, too */
input = StripLeft(input + 1);
break;
}
if (!valid_word_char(*input))
throw std::runtime_error("Invalid word character");
}
/* end of string: the string is already null-terminated
here */
return word;
}
static inline bool
valid_unquoted_char(char ch)
{
return (unsigned char)ch > 0x20 && ch != '"' && ch != '\'';
}
char *
Tokenizer::NextUnquoted()
{
char *const word = input;
if (*input == 0)
return nullptr;
/* check the first character */
if (!valid_unquoted_char(*input))
throw std::runtime_error("Invalid unquoted character");
/* now iterate over the other characters until we find a
whitespace or end-of-string */
while (*++input != 0) {
if (IsWhitespaceFast(*input)) {
/* a whitespace: the word ends here */
*input = 0;
/* skip all following spaces, too */
input = StripLeft(input + 1);
break;
}
if (!valid_unquoted_char(*input))
throw std::runtime_error("Invalid unquoted character");
}
/* end of string: the string is already null-terminated
here */
return word;
}
char *
Tokenizer::NextString()
{
char *const word = input, *dest = input;
if (*input == 0)
/* end of line */
return nullptr;
/* check for the opening " */
if (*input != '"')
throw std::runtime_error("'\"' expected");
++input;
/* copy all characters */
while (*input != '"') {
if (*input == '\\')
/* the backslash escapes the following
character */
++input;
if (*input == 0)
throw std::runtime_error("Missing closing '\"'");
/* copy one character */
*dest++ = *input++;
}
/* the following character must be a whitespace (or end of
line) */
++input;
if (!IsWhitespaceFast(*input))
throw std::runtime_error("Space expected after closing '\"'");
/* finish the string and return it */
*dest = 0;
input = StripLeft(input);
return word;
}
char *
Tokenizer::NextParam()
{
if (*input == '"')
return NextString();
else
return NextUnquoted();
}
|
