luau-syntax 0.732.0

Luau lexer, parser, AST, CST, and source utilities
Documentation 
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use super::*;

impl<'source, 'ast, 'name, 'names> Parser<'source, 'ast, 'name, 'names>
where
    'name: 'ast,
{
    pub(in crate::parser) fn recover_match_on_line(
        &mut self,
        expected: Token<'source, 'ast>,
    ) -> bool {
        let expected_kind = expected.kind();
        let line = self.previous_token_end_position().line;
        while self.current.kind() != TokenKind::Eof
            && self.current_token_location().begin.line == line
        {
            if self.current.kind() == expected_kind {
                self.advance();
                return true;
            }
            if self.match_recovery_stops_at_current() {
                return false;
            }
            self.advance();
        }
        false
    }

    pub(in crate::parser) fn with_match_recovery_stop<T>(
        &mut self,
        stop: MatchRecoveryStop,
        parse: impl FnOnce(&mut Self) -> Result<T>,
    ) -> Result<T> {
        self.push_match_recovery_stop(stop);
        let result = parse(self);
        self.pop_match_recovery_stop(stop);
        result
    }

    pub(in crate::parser) fn push_match_recovery_stop(&mut self, stop: MatchRecoveryStop) {
        self.recovery.match_recovery_stops[stop.index()] += 1;
    }

    pub(in crate::parser) fn pop_match_recovery_stop(&mut self, stop: MatchRecoveryStop) {
        let slot = &mut self.recovery.match_recovery_stops[stop.index()];
        debug_assert!(*slot != 0, "parser match recovery stop is balanced");
        *slot -= 1;
    }

    pub(in crate::parser) fn match_recovery_stops_at_current(&self) -> bool {
        match self.current.kind() {
            TokenKind::Equal => {
                self.recovery.match_recovery_stops[MatchRecoveryStop::Equal.index()] != 0
            }
            TokenKind::RightParen => {
                self.recovery.match_recovery_stops[MatchRecoveryStop::RightParen.index()] != 0
            }
            TokenKind::Reserved(R::End) => {
                self.recovery.match_recovery_stops[MatchRecoveryStop::ReservedEnd.index()] != 0
            }
            TokenKind::SkinnyArrow => {
                self.recovery.match_recovery_stops[MatchRecoveryStop::SkinnyArrow.index()] != 0
            }
            _ => false,
        }
    }
}