Function parse_operand

src/expr-parser/src/parser.rs:958–989

(input: ParseStream)

    }

    pub fn parse_operand(input: ParseStream) -> Result {
        let lookahead = input.lookahead1();
        if lookahead.peek(syn::Token![#]) {
            parse_column(input)
        } else if lookahead.peek(syn::Lit) || lookahead.peek(kw::null) {
            parse_literal_ok(input)
        } else if lookahead.peek(kw::error) {
            parse_literal_err(input)
        } else if lookahead.peek(kw::array) {
            parse_array(input)
        } else if lookahead.peek(kw::list) {
            parse_list(input)
        } else if lookahead.peek(kw::case) {
            parse_case(input)
        } else if lookahead.peek(syn::Ident) {
            parse_apply(input)
        } else if lookahead.peek(syn::token::Brace) {
            let inner;
            syn::braced!(inner in input);
            parse_literal_array(&inner)
        } else if lookahead.peek(syn::token::Bracket) {
            let inner;
            syn::bracketed!(inner in input);
            parse_literal_list(&inner)
        } else if lookahead.peek(syn::token::Paren) {
            let inner;
            syn::parenthesized!(inner in input);
            parse_expr(&inner)
        } else {
            Err(lookahead.error())
        }
    }

    /// Parses `case when {cond} then {then} else {els} end`.
    fn parse_case(input: ParseStream) -> Result {