Struct combine::State

pub struct State<I> where
    I: Stream,
    I::Item: Positioner,  {
    pub position: <I::Item as Positioner>::Position,
    pub input: I,
}

The State<I> struct keeps track of the current position in the stream I using the Positioner trait to update the position.

Fields

position: <I::Item as Positioner>::Position

The current position

input: I

The input stream used when items are requested

Methods

impl<I> State<I> where
    I: Stream,
    I::Item: Positioner, 

fn new(input: I) -> State<I>

Creates a new State<I> from an input stream. Initializes the position to Positioner::start().

Trait Implementations

impl<I: Clone> Clone for State<I> where
    I: Stream,
    I::Item: Positioner,
    I::Item: Clone, 

fn clone(&self) -> State<I>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<I: PartialEq> PartialEq for State<I> where
    I: Stream,
    I::Item: Positioner,
    I::Item: PartialEq, 

fn eq(&self, __arg_0: &State<I>) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, __arg_0: &State<I>) -> bool

This method tests for !=.

impl<I> Debug for State<I> where
    I: Stream + Debug,
    I::Item: Positioner,
    <I::Item as Positioner>::Position: Debug, 

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl<I> StreamOnce for State<I> where
    I: Stream,
    I::Item: Positioner, 

type Item = I::Item

The type of items which is yielded from this stream.

type Range = I::Range

The type of a range of items yielded from this stream. Types which do not a have a way of yielding ranges of items should just use the Self::Item for this type.

type Position = <I::Item as Positioner>::Position

Type which represents the position in a stream. Ord is required to allow parsers to determine which of two positions are further ahead.

fn uncons(&mut self) -> Result<I::Item, Error<I::Item, I::Range>>

Takes a stream and removes its first item, yielding the item and the rest of the elements. Returns Err if no element could be retrieved.

fn position(&self) -> Self::Position

Returns the current position of the stream.

impl<I, E> RangeStream for State<I> where
    I: RangeStream<Item = E>,
    I::Range: Range + Positioner<Position = E::Position>,
    E: Positioner + Clone, 

fn uncons_range(
    &mut self,
    size: usize
) -> Result<I::Range, Error<I::Item, I::Range>>

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

fn uncons_while<F>(
    &mut self,
    predicate: F
) -> Result<I::Range, Error<I::Item, I::Range>> where
    F: FnMut(I::Item) -> bool, 

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