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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'
}
|
