Struct Lookahead

pub struct Lookahead { /* private fields */ }

Used to look ahead one token in the lexer.

The lookahead stores up to 10 attempted tokens.

Implementations

impl Lookahead

pub fn new(lexer: &Lexer<'_>) -> Self

Creates a new lookahead from the given lexer.

pub fn peek(&mut self, expected: Token) -> bool

Peeks to see if the next token matches the given token.

pub fn error(self) -> Error

Returns an error based on the attempted tokens.

Panics if no peeks were attempted.