Struct Mark 

pub struct Mark<'a> { /* private fields */ }

A mark struct used to mark positions in a TokenStream for backtracking

Examples

use slk_tokenstream::TokenStream;
use slk_tokenstream::Mark;
 
let tokens = &[1, 2, 3];
let mut token_stream = TokenStream::new(tokens);
let mark: Mark = token_stream.mark();
 
token_stream.advance(5);
assert_eq!(token_stream.peek(), None);
token_stream.reset(&mark);
assert_eq!(token_stream.peek(), Some(&1));

Implementations

impl<'a> Mark<'a>

pub fn position(&self) -> usize

Returns the position

Example

use slk_tokenstream::Mark;
use slk_tokenstream::TokenStream;
 
let mut token_stream = TokenStream::new(&[0; 12]);
token_stream.advance(12);
 

assert_eq!(token_stream.mark().position(), 12);

Trait Implementations

impl<'a> Clone for Mark<'a>

fn clone(&self) -> Mark<'a>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> Copy for Mark<'a>

impl<'a> Debug for Mark<'a>

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

Formats the value using the given formatter.