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use {Input, ParseResult};
use primitives::{IntoInner, State};
use primitives::input;
#[derive(Debug, Eq, PartialEq)]
pub enum ParseError<'a, I, E>
where I: 'a {
Error(&'a [I], E),
Incomplete(usize),
}
pub fn parse_only<'a, I, T, E, F>(parser: F, input: &'a [I]) -> Result<T, ParseError<'a, I, E>>
where T: 'a,
E: 'a,
F: FnOnce(Input<'a, I>) -> ParseResult<'a, I, T, E> {
match parser(input::new(input::END_OF_INPUT, input)).into_inner() {
State::Data(_, t) => Ok(t),
State::Error(b, e) => Err(ParseError::Error(b, e)),
State::Incomplete(n) => Err(ParseError::Incomplete(n)),
}
}
#[cfg(test)]
mod test {
use primitives::InputBuffer;
use super::{
ParseError,
parse_only,
};
#[test]
fn inspect_input() {
let mut state = None;
let mut input = None;
assert_eq!(parse_only(|i| {
state = Some(i.is_last_slice());
input = Some(i.buffer());
i.ret::<_, ()>("the result")
}, b"the input"), Ok("the result"));
assert_eq!(input, Some(&b"the input"[..]));
assert_eq!(state, Some(true));
}
#[test]
fn err() {
assert_eq!(parse_only(|i| {
let buf = i.buffer();
i.replace(&buf[4..]).err::<(), _>("my error")
}, b"the input"), Err(ParseError::Error(&b"input"[..], "my error")));
}
#[test]
fn incomplete() {
assert_eq!(parse_only(|i| i.incomplete::<(), ()>(23), b"the input"), Err(ParseError::Incomplete(23)));
}
}