Trait Positioner

pub trait Positioner<Item> {
    type Position: Clone + Ord;
    type Checkpoint: Clone;

    // Required methods
    fn position(&self) -> Self::Position;
    fn update(&mut self, token: &Item);
    fn checkpoint(&self) -> Self::Checkpoint;
    fn reset(&mut self, checkpoint: Self::Checkpoint);
}

Trait for tracking the current position of a Stream.

Required Associated Types

type Position: Clone + Ord

The type which keeps track of the position

type Checkpoint: Clone

Required Methods

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

Returns the current position

fn update(&mut self, token: &Item)

Updates the position given that token has been taken from the stream

fn checkpoint(&self) -> Self::Checkpoint

fn reset(&mut self, checkpoint: Self::Checkpoint)

Implementations on Foreign Types

impl<Item, T> Positioner<Item> for &mut T

where Item: Clone, T: ?Sized + Positioner<Item>,

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

type Checkpoint = <T as Positioner<Item>>::Checkpoint

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

fn update(&mut self, item: &Item)

fn checkpoint(&self) -> Self::Checkpoint

fn reset(&mut self, checkpoint: Self::Checkpoint)

Implementors

impl Positioner<char> for SourcePosition

type Position = SourcePosition

type Checkpoint = SourcePosition

impl Positioner<u8> for SourcePosition

type Position = SourcePosition

type Checkpoint = SourcePosition

impl<Item> Positioner<Item> for IndexPositioner

where Item: Clone,

type Position = usize

type Checkpoint = IndexPositioner