Struct ParseCx 

pub struct ParseCx { /* private fields */ }

Cursor over a spanned Algol token stream, driving the Pratt parser with peek, advance, and lookahead operations.

Implementations

impl ParseCx

pub fn new(tokens: Vec<SpannedToken>) -> Self

Creates a cursor positioned at the first of tokens.

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

Returns the current token without consuming it, or None at end of input.

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

Consumes and returns the current token, or None at end of input.

pub fn next_required(&mut self) -> Result<SpannedToken>

Consumes the current token, erroring if the stream is exhausted.

pub fn is_empty(&self) -> bool

Returns true once every token has been consumed.