Struct CharScanner 

pub struct CharScanner { /* private fields */ }

A simple char scanner for iterating over source text.

Provides look-ahead operations useful in the OxiLean lexer.

Implementations

impl CharScanner

pub fn new(s: &str) -> Self

Create a new scanner from a string.

pub fn peek(&self) -> Option<char>

Peek at the current character without consuming.

pub fn peek_at(&self, offset: usize) -> Option<char>

Peek at the character offset positions ahead.

pub fn advance(&mut self) -> Option<char>

Consume and return the current character.

pub fn eat(&mut self, expected: char) -> bool

Consume the current character if it equals expected.

pub fn take_while(&mut self, predicate: impl Fn(char) -> bool) -> String

Consume while predicate returns true. Returns consumed string.

pub fn remaining(&self) -> usize

Return the remaining (unconsumed) characters.

pub fn is_eof(&self) -> bool

Check if the scanner is at end of input.

pub fn consumed(&self) -> String

Return all consumed characters as a string.