Method parse_match_pattern_lhs

crates/ruff_python_parser/src/parser/pattern.rs:164–192

Parses a pattern. See:

(&mut self, allow_star_pattern: AllowStarPattern)

    ///
    /// See: <https://docs.python.org/3/reference/compound_stmts.html#grammar-token-python-grammar-closed_pattern>
    fn parse_match_pattern_lhs(&mut self, allow_star_pattern: AllowStarPattern) -> Pattern {
        let start = self.node_start();

        let mut lhs = match self.current_token_kind() {
            TokenKind::Lbrace => Pattern::MatchMapping(self.parse_match_pattern_mapping()),
            TokenKind::Star => {
                let star_pattern = self.parse_match_pattern_star();
                if allow_star_pattern.is_no() {
                    self.add_error(ParseErrorType::InvalidStarPatternUsage, &star_pattern);
                }
                Pattern::MatchStar(star_pattern)
            }
            TokenKind::Lpar | TokenKind::Lsqb => self.parse_parenthesized_or_sequence_pattern(),
            _ => self.parse_match_pattern_literal(),
        };

        if self.at(TokenKind::Lpar) {
            lhs = Pattern::MatchClass(self.parse_match_pattern_class(lhs, start));
        }

        if matches!(
            self.current_token_kind(),
            TokenKind::Plus | TokenKind::Minus
        ) {
            lhs = Pattern::MatchValue(self.parse_complex_literal_pattern(lhs, start));
        }

        lhs
    }

    /// Parses a mapping pattern.
    ///