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Version of the attoparsec example using the parser combinator Combine version 1.0.0.
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extern crate combine; | |
use combine::*; | |
use combine::primitives::Error; | |
use std::fs::File; | |
use std::env; | |
#[derive(Debug)] | |
struct Request { | |
method: Vec<u8>, | |
uri: Vec<u8>, | |
version: Vec<u8>, | |
} | |
#[derive(Debug)] | |
struct Header { | |
name: Vec<u8>, | |
value: Vec<Vec<u8>>, | |
} | |
fn is_token(c: u8) -> bool { | |
// roughly follows the order of ascii chars: "\"(),/:;<=>?@[\\]{} \t" | |
c < 128 && c > 32 && c != b'\t' && c != b'"' && c != b'(' && c != b')' && | |
c != b',' && c != b'/' && !(c > 57 && c < 65) && !(c > 90 && c < 94) && | |
c != b'{' && c != b'}' | |
} | |
fn is_horizontal_space(c: u8) -> bool { c == b' ' || c == b'\t' } | |
fn is_space(c: u8) -> bool { c == b' ' } | |
fn is_not_space(c: u8) -> bool { c != b' ' } | |
fn is_http_version(c: u8) -> bool { c >= b'0' && c <= b'9' || c == b'.' } | |
fn main() { | |
let mut contents: Vec<u8> = Vec::new(); | |
{ | |
use std::io::Read; | |
let mut file = File::open(env::args().nth(1).expect("File to read")).ok().expect("Failed to open file"); | |
let _ = file.read_to_end(&mut contents).unwrap(); | |
} | |
// Making a closure, because parser instances cannot be reused | |
let end_of_line = || (satisfy(|c| c == b'\r').skip(satisfy(|c| c == b'\n'))).or(satisfy(|c| c == b'\n')); | |
// let mut http_version = string(&b"HTTP/"[..]) | |
let mut http_version = satisfy(|c| c == b'H') | |
.with(satisfy(|c| c == b'T')) | |
.with(satisfy(|c| c == b'T')) | |
.with(satisfy(|c| c == b'P')) | |
.with(satisfy(|c| c == b'/')) | |
.with(many1(satisfy(|c| is_http_version(c)))); | |
let request_line = parser(|input| ( | |
// dereferencing pointers before checking if it is a token | |
many1(satisfy(|c| is_token(c))), | |
skip_many1(satisfy(|c| is_space(c))), | |
many1(satisfy(|c| is_not_space(c))), | |
skip_many1(satisfy(|c| is_space(c))), | |
&mut http_version, | |
).map(|(method, _, uri, _, version)| Request { | |
method: method, | |
uri: uri, | |
version: version, | |
}) | |
.parse_lazy(input) | |
); | |
let message_header = parser(|input| { | |
let message_header_line = ( | |
skip_many1(satisfy(|c| is_horizontal_space(c))), | |
many1(satisfy(|c| c != b'\r' && c != b'\n')), | |
end_of_line() | |
).map(|(_, line, _)| line); | |
( | |
many1(satisfy(|c| is_token(c))), | |
satisfy(|c| c == b':'), | |
many1(message_header_line) | |
).map(|(name, _, value)| Header { | |
name: name, | |
value: value, | |
}) | |
.parse_lazy(input) | |
}); | |
let mut request = ( | |
request_line, | |
end_of_line(), | |
many(message_header), | |
end_of_line() | |
).map(|(request, _, headers, _)| (request, headers)); | |
let mut i = 0; | |
let mut buf = &contents[..]; | |
loop { | |
// Needed for inferrence for many(message_header) | |
let r: Result<((Request, Vec<Header>), _), _> = request.parse(buf); | |
match r { | |
Ok(((_, _), b)) => { | |
i = i + 1; | |
buf = b | |
}, | |
Err(e) => { | |
if e.errors[0] == Error::end_of_input() { | |
return | |
} | |
panic!("{:?}", e); | |
} | |
} | |
if buf.is_empty() { | |
break; | |
} | |
} | |
println!("num: {}", i); | |
} |
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