Trait combine::RangeStreamOnce

pub trait RangeStreamOnce: StreamOnce + Resetable {
    // Required methods
    fn uncons_range(
        &mut self,
        size: usize
    ) -> Result<Self::Range, StreamErrorFor<Self>>;
    fn uncons_while<F>(
        &mut self,
        f: F
    ) -> Result<Self::Range, StreamErrorFor<Self>>
       where F: FnMut(Self::Item) -> bool;
    fn distance(&self, end: &Self::Checkpoint) -> usize;

    // Provided method
    fn uncons_while1<F>(
        &mut self,
        f: F
    ) -> FastResult<Self::Range, StreamErrorFor<Self>>
       where F: FnMut(Self::Item) -> bool { ... }
}

A RangeStream is an extension of StreamOnce which allows for zero copy parsing.

Required Methods

fn uncons_range( &mut self, size: usize ) -> Result<Self::Range, StreamErrorFor<Self>>

Takes size elements from the stream. Fails if the length of the stream is less than size.

fn uncons_while<F>(&mut self, f: F) -> Result<Self::Range, StreamErrorFor<Self>>where F: FnMut(Self::Item) -> bool,

Takes items from stream, testing each one with predicate. returns the range of items which passed predicate.

fn distance(&self, end: &Self::Checkpoint) -> usize

Returns the distance between self and end. The returned usize must be so that

let start = stream.checkpoint();
stream.uncons_range(distance);
stream.distance(&start) == distance

Provided Methods

fn uncons_while1<F>( &mut self, f: F ) -> FastResult<Self::Range, StreamErrorFor<Self>>where F: FnMut(Self::Item) -> bool,

Takes items from stream, testing each one with predicate returns a range of at least one items which passed predicate.

Note

This may not return EmptyOk as it should uncons at least one item.

Object Safety

This trait is not object safe.

Implementations on Foreign Types

impl<'a> RangeStreamOnce for &'a str

fn uncons_while<F>(&mut self, f: F) -> Result<&'a str, StreamErrorFor<Self>>where F: FnMut(Self::Item) -> bool,

fn uncons_while1<F>( &mut self, f: F ) -> FastResult<Self::Range, StreamErrorFor<Self>>where F: FnMut(Self::Item) -> bool,

fn uncons_range(&mut self, size: usize) -> Result<&'a str, StreamErrorFor<Self>>

fn distance(&self, end: &Self) -> usize

impl<'a, T> RangeStreamOnce for &'a [T]where T: Clone + PartialEq,

fn uncons_range(&mut self, size: usize) -> Result<&'a [T], StreamErrorFor<Self>>

fn uncons_while<F>(&mut self, f: F) -> Result<&'a [T], StreamErrorFor<Self>>where F: FnMut(Self::Item) -> bool,

fn uncons_while1<F>( &mut self, f: F ) -> FastResult<Self::Range, StreamErrorFor<Self>>where F: FnMut(Self::Item) -> bool,

fn distance(&self, end: &Self) -> usize

Implementors

impl<'a, T> RangeStreamOnce for SliceStream<'a, T>where T: PartialEq + 'a,

impl<I, X, S> RangeStreamOnce for State<I, X>where I: RangeStreamOnce, X: Resetable + RangePositioner<I::Item, I::Range>, S: StreamError<I::Item, I::Range>, I::Error: ParseError<I::Item, I::Range, X::Position, StreamError = S> + ParseError<I::Item, I::Range, I::Position, StreamError = S>, I::Position: Clone + Ord,

impl<S> RangeStreamOnce for Stream<S>where S: RangeStream,

impl<S> RangeStreamOnce for PartialStream<S>where S: RangeStreamOnce,