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#![cfg_attr(not(feature = "std"), no_std)] #[cfg(feature = "alloc")] extern crate alloc; use core::{ future::Future, pin::Pin, task::{Context, Poll}, }; pub mod iter; #[cfg(feature = "nom-adapters")] pub mod nom; pub mod read; pub mod utf8; #[derive(Debug, PartialEq, Eq, Hash)] pub enum Streaming<T> { Item(T), Incomplete, } pub type Parsed<T> = (Option<T>, usize); pub trait Buffer { type Output: ?Sized; fn buffer(&mut self) -> (&Self::Output, &mut usize); fn exhausted(&self) -> bool; } pub trait Advance { type Error; fn advance(&mut self) -> Result<(), Self::Error>; } pub trait AdvanceAsync { type Error; fn poll_advance(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Result<(), Self::Error>>; } pub trait Parse<'i> { type Input: 'i; type Output; type Error; fn parse(&mut self, input: Self::Input) -> Result<Streaming<Parsed<Self::Output>>, Self::Error>; fn parse_eof(&mut self, input: Self::Input) -> Result<Parsed<Self::Output>, Self::Error>; } #[derive(Debug)] #[must_use = "futures do nothing unless you `.await` or poll them"] struct AdvanceAsyncFuture<'a, B: ?Sized>(&'a mut B); impl<B> Future for AdvanceAsyncFuture<'_, B> where B: ?Sized + AdvanceAsync + Unpin, { type Output = Result<(), B::Error>; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let this = &mut *self; Pin::new(&mut *this.0).poll_advance(cx) } } pub(crate) fn advance_async<B>(src: &mut B) -> impl Future<Output = Result<(), B::Error>> + '_ where B: ?Sized + AdvanceAsync + Unpin, { AdvanceAsyncFuture(src) } pub struct StreamParser<P, S> { parser: P, source: S, } impl<P, S> StreamParser<P, S> { pub fn new(parser: P, source: S) -> Self { StreamParser { parser, source } } pub fn advance(&mut self) -> Result<(), S::Error> where S: Advance, { self.source.advance() } pub fn advance_async(&mut self) -> impl Future<Output = Result<(), S::Error>> + '_ where S: AdvanceAsync + Unpin, { advance_async(&mut self.source) } pub fn get(&mut self) -> Result<Option<Streaming<<P as Parse>::Output>>, <P as Parse>::Error> where S: Buffer, for<'i> P: Parse<'i, Input = &'i S::Output>, { let exhausted = self.source.exhausted(); let (input, pos) = self.source.buffer(); match self.parser.parse(input) { Ok(Streaming::Item((output, parsed))) => { *pos += parsed; Ok(output.map(Streaming::Item)) } Ok(Streaming::Incomplete) => { if exhausted { match self.parser.parse_eof(input) { Ok((output, parsed)) => { *pos += parsed; Ok(output.map(Streaming::Item)) } Err(err) => Err(err), } } else { Ok(Some(Streaming::Incomplete)) } } Err(err) => Err(err), } } } #[cfg(all(doctest, feature = "std"))] doc_comment::doctest!("../README.md"); #[cfg(test)] mod tests;