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
#[macro_use]
extern crate nom;
use nom::is_digit;
use std::str::FromStr;
use std::net::Ipv4Addr;
named!(dot, tag!("."));
named!(d8<u8>, map!(take_while!(is_digit), |digits: &[u8]| -> u8 {
if digits.len() > 3 {
return 0;
}
let u8_str = match std::str::from_utf8(digits) {
Ok(s) => s,
Err(_) => return 0,
};
match u8::from_str(u8_str) {
Ok(val) => return val,
Err(_) => return 0,
}
}));
named!(pub ipv4_address<&[u8], Ipv4Addr>, chain!(a: d8 ~
dot ~
b: d8 ~
dot ~
c: d8 ~
dot ~
d: d8,
|| { Ipv4Addr::new(a, b, c, d) }));
#[cfg(test)]
mod test {
#[test]
fn check_ipv4_address() {
use super::ipv4_address;
use super::nom::IResult;
use std::net::Ipv4Addr;
let to_parse = b"192.168.1.1";
let exp_out = Ipv4Addr::new(192, 168, 1, 1);
let exp_in = b"";
match ipv4_address(to_parse) {
IResult::Done(in_, out) => {
assert_eq!(out, exp_out);
assert_eq!(in_, exp_in);
},
IResult::Incomplete(x) => panic!("incomplete: {:?}", x),
IResult::Error(e) => panic!("error: {:?}", e),
}
}
}