winnow 1.0.2

A byte-oriented, zero-copy, parser combinators library
Documentation 
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

use winnow::combinator::seq;
use winnow::prelude::*;
use winnow::{ascii::line_ending, combinator::repeat, token::take_while};

pub(crate) type Stream<'i> = &'i [u8];

#[rustfmt::skip]
#[derive(Debug)]
#[allow(dead_code)]
pub(crate) struct Request<'a> {
  method:  &'a [u8],
  uri:     &'a [u8],
  version: &'a [u8],
}

#[derive(Debug)]
#[allow(dead_code)]
pub(crate) struct Header<'a> {
    name: &'a [u8],
    value: Vec<&'a [u8]>,
}

pub(crate) fn parse(data: &[u8]) -> Option<Vec<(Request<'_>, Vec<Header<'_>>)>> {
    let mut buf = data;
    let mut v = Vec::new();
    loop {
        match request(&mut buf) {
            Ok(r) => {
                v.push(r);

                if buf.is_empty() {
                    //println!("{}", i);
                    break;
                }
            }
            Err(e) => {
                println!("error: {e:?}");
                return None;
            }
        }
    }

    Some(v)
}

fn request<'s>(input: &mut Stream<'s>) -> ModalResult<(Request<'s>, Vec<Header<'s>>)> {
    let req = request_line(input)?;
    let h = repeat(1.., message_header).parse_next(input)?;
    let _ = line_ending.parse_next(input)?;

    Ok((req, h))
}

fn request_line<'s>(input: &mut Stream<'s>) -> ModalResult<Request<'s>> {
    seq!( Request {
        method: take_while(1.., is_token),
        _: take_while(1.., is_space),
        uri: take_while(1.., is_not_space),
        _: take_while(1.., is_space),
        version: http_version,
        _: line_ending,
    })
    .parse_next(input)
}

fn http_version<'s>(input: &mut Stream<'s>) -> ModalResult<&'s [u8]> {
    let _ = "HTTP/".parse_next(input)?;
    let version = take_while(1.., is_version).parse_next(input)?;

    Ok(version)
}

fn message_header_value<'s>(input: &mut Stream<'s>) -> ModalResult<&'s [u8]> {
    let _ = take_while(1.., is_horizontal_space).parse_next(input)?;
    let data = take_while(1.., till_line_ending).parse_next(input)?;
    let _ = line_ending.parse_next(input)?;

    Ok(data)
}

fn message_header<'s>(input: &mut Stream<'s>) -> ModalResult<Header<'s>> {
    seq!(Header {
        name: take_while(1.., is_token),
        _: ':',
        value: repeat(1.., message_header_value),
    })
    .parse_next(input)
}

#[rustfmt::skip]
#[allow(clippy::match_same_arms)]
#[allow(clippy::match_like_matches_macro)]
fn is_token(c: u8) -> bool {
  match c {
    128..=255 => false,
    0..=31    => false,
    b'('      => false,
    b')'      => false,
    b'<'      => false,
    b'>'      => false,
    b'@'      => false,
    b','      => false,
    b';'      => false,
    b':'      => false,
    b'\\'     => false,
    b'"'      => false,
    b'/'      => false,
    b'['      => false,
    b']'      => false,
    b'?'      => false,
    b'='      => false,
    b'{'      => false,
    b'}'      => false,
    b' '      => false,
    _         => true,
  }
}

fn is_version(c: u8) -> bool {
    c.is_ascii_digit() || c == b'.'
}

fn till_line_ending(c: u8) -> bool {
    c != b'\r' && c != b'\n'
}

fn is_space(c: u8) -> bool {
    c == b' '
}

fn is_not_space(c: u8) -> bool {
    c != b' '
}

fn is_horizontal_space(c: u8) -> bool {
    c == b' ' || c == b'\t'
}