incpa 0.0.3

An INCremental PArser composition crate.
Documentation 
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#[cfg(test)]
mod tests;

use std::fmt::Debug;
use std::marker::PhantomData;

use crate::state::{ParserState, Update};
use crate::{BaseParserError, Parser};

/// Captures all remaining input
///
/// # Warning
///
/// This requires holding all input in memory, by definition.
pub fn remaining<I>() -> impl Parser<I, Output = I::Owned, Error = BaseParserError> + Copy + Debug
where
    I: ?Sized + ToOwned + 'static,
{
    Remaining(PhantomData)
}

struct Remaining<I>(PhantomData<&'static I>)
where
    I: ?Sized + 'static;

impl<I> Parser<I> for Remaining<I>
where
    I: ?Sized + ToOwned + 'static,
{
    type Output = I::Owned;
    type Error = BaseParserError;
    type State = Remaining<I>;

    fn into_parser(self) -> Self::State {
        Remaining(PhantomData)
    }
}

impl<I> ParserState<I> for Remaining<I>
where
    I: ?Sized + ToOwned + 'static,
{
    type Output = I::Owned;
    type Error = BaseParserError;

    fn feed(self, _: &I) -> Result<Update<Self, I::Owned>, Self::Error> {
        use crate::state::Outcome::Next;

        Ok(Update {
            consumed: 0,
            outcome: Next(self),
        })
    }

    fn end_input(self, final_input: &I) -> Result<I::Owned, Self::Error> {
        Ok(final_input.to_owned())
    }
}

impl<I> Copy for Remaining<I> where I: ?Sized {}

impl<I> Clone for Remaining<I>
where
    I: ?Sized,
{
    fn clone(&self) -> Self {
        *self
    }
}

impl<I> Debug for Remaining<I>
where
    I: ?Sized + ToOwned + 'static,
{
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "remaining<I = {}>()", std::any::type_name::<I>())
    }
}