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
#![allow(non_snake_case)]
use nom::branch::alt;
use nom::bytes::complete::tag;
use nom::character::complete::char;
use nom::combinator::map;
use nom::multi::many0;
use nom::sequence::tuple;
use nom::{Err, IResult};
pub fn ALPHA(i: &[u8]) -> IResult<&[u8], char> {
if i.is_empty() {
Err(Err::Error((i, nom::error::ErrorKind::Char)))
} else if is_ALPHA(i[0]) {
Ok((&i[1..], i[0] as char))
} else {
Err(Err::Error((i, nom::error::ErrorKind::Char)))
}
}
pub fn is_ALPHA(i: u8) -> bool {
match i as char {
'a'..='z' | 'A'..='Z' => true,
_ => false,
}
}
pub fn BIT(input: &[u8]) -> IResult<&[u8], char> {
nom::character::complete::one_of("01")(input)
}
pub fn CHAR(i: &[u8]) -> IResult<&[u8], &[u8]> {
if i.is_empty() {
Err(Err::Error((i, nom::error::ErrorKind::Char)))
} else if is_CHAR(i[0]) {
Ok((&i[1..], &i[0..1]))
} else {
Err(Err::Error((i, nom::error::ErrorKind::Char)))
}
}
pub fn is_CHAR(i: u8) -> bool {
match i {
0x01..=0x7F => true,
_ => false,
}
}
pub fn CR(input: &[u8]) -> IResult<&[u8], char> {
char('\r')(input)
}
pub fn CRLF(input: &[u8]) -> IResult<&[u8], &[u8]> {
alt((tag("\r\n"), tag("\n")))(input)
}
pub fn CTL(i: &[u8]) -> IResult<&[u8], &[u8]> {
if i.is_empty() {
Err(Err::Error((i, nom::error::ErrorKind::Char)))
} else if is_CTL(i[0]) {
Ok((&i[1..], &i[0..1]))
} else {
Err(Err::Error((i, nom::error::ErrorKind::Char)))
}
}
pub fn is_CTL(i: u8) -> bool {
match i {
0x00..=0x1F | 0x7F => true,
_ => false,
}
}
pub fn DIGIT(input: &[u8]) -> IResult<&[u8], char> {
nom::character::complete::one_of("0123456789")(input)
}
pub fn is_DIGIT(i: u8) -> bool {
match i {
b'0'..=b'9' => true,
_ => false,
}
}
pub fn DQUOTE(input: &[u8]) -> IResult<&[u8], char> {
char('"')(input)
}
pub fn HEXDIG(input: &[u8]) -> IResult<&[u8], char> {
nom::character::complete::one_of("0123456789abcdefABCDEF")(input)
}
pub fn is_HEXDIG(i: u8) -> bool {
match i {
b'0'..=b'9' | b'a'..=b'f' | b'A'..=b'F' => true,
_ => false,
}
}
pub fn HTAB(input: &[u8]) -> IResult<&[u8], char> {
char('\t')(input)
}
pub fn LF(input: &[u8]) -> IResult<&[u8], char> {
char('\n')(input)
}
pub fn LWSP(input: &[u8]) -> IResult<&[u8], Vec<Vec<u8>>> {
let parser = many0(alt((
map(WSP, |c| vec![c as u8]),
map(tuple((CRLF, WSP)), |(crlf, wsp)| {
let mut tmp = Vec::new();
tmp.extend(crlf);
tmp.push(wsp as u8);
tmp
}),
)));
parser(input)
}
pub fn OCTET(i: &[u8]) -> IResult<&[u8], &[u8]> {
if i.is_empty() {
Err(Err::Error((i, nom::error::ErrorKind::Char)))
} else {
Ok((&i[1..], &i[0..1]))
}
}
pub fn SP(input: &[u8]) -> IResult<&[u8], char> {
char(' ')(input)
}
pub fn VCHAR(i: &[u8]) -> IResult<&[u8], char> {
if i.is_empty() {
Err(Err::Error((i, nom::error::ErrorKind::Char)))
} else if is_VCHAR(i[0]) {
Ok((&i[1..], i[0] as char))
} else {
Err(Err::Error((i, nom::error::ErrorKind::Char)))
}
}
pub fn is_VCHAR(i: u8) -> bool {
match i {
0x21..=0x7E => true,
_ => false,
}
}
pub fn WSP(input: &[u8]) -> IResult<&[u8], char> {
alt((SP, HTAB))(input)
}
pub fn is_WSP(i: u8) -> bool {
match i {
0x20 | 0x09 => true,
_ => false,
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_BIT() {
assert_eq!(BIT(b"100"), Ok((&[b'0', b'0'][..], '1')));
assert_eq!(BIT(b"010"), Ok((&[b'1', b'0'][..], '0')));
assert!(BIT(b"").is_err());
assert!(BIT(b"/").is_err());
assert!(BIT(b"2").is_err());
}
#[test]
fn test_HEXDIG() {
assert_eq!(HEXDIG(b"FaA"), Ok((&[b'a', b'A'][..], 'F')));
assert_eq!(HEXDIG(b"0aA"), Ok((&[b'a', b'A'][..], '0')));
assert!(HEXDIG(b"").is_err());
assert!(HEXDIG(b"/").is_err());
assert!(HEXDIG(b":").is_err());
assert!(HEXDIG(b"`").is_err());
assert!(HEXDIG(b"g").is_err());
assert!(HEXDIG(b"@").is_err());
assert!(HEXDIG(b"G").is_err());
}
}