Struct wast::parser::Lookahead1

pub struct Lookahead1<'a> { /* fields omitted */ }

A helpful structure to perform a lookahead of one token to determine what to parse.

For more information see the [Parser::lookahead1] method.

Methods

impl<'_> Lookahead1<'_>

pub fn peek<T: Peek>(&mut self) -> bool

Attempts to see if T is the next token in the [Parser] this [Lookahead1] references.

For more information see [Parser::lookahead1] and [Parser::peek]

pub fn error(self) -> Error

Generates an error message saying that one of the tokens passed to [Lookahead1::peek] method was expected.

Before calling this method you should call [Lookahead1::peek] for all possible tokens you'd like to parse.