Function parse_contained_by_expression

crates/gitql-parser/src/parser.rs:2089–2144

(
    context: &mut ParserContext,
    env: &mut Environment,
    tokens: &[Token],
    position: &mut usize,
)

}

fn parse_contained_by_expression(
    context: &mut ParserContext,
    env: &mut Environment,
    tokens: &[Token],
    position: &mut usize,
) -> Result<Box<dyn Expr>, Box<Diagnostic>> {
    let lhs = parse_bitwise_shift_expression(context, env, tokens, position)?;

    if is_current_token(tokens, position, TokenKind::ArrowRightAt) {
        let operator = &tokens[*position];

        // Consume `<@` token
        *position += 1;

        let rhs = parse_bitwise_shift_expression(context, env, tokens, position)?;

        let lhs_type = lhs.expr_type();
        let rhs_type = rhs.expr_type();

        let expected_lhs_types = rhs_type.can_perform_contains_op_with();

        // Can perform this operator between LHS and RHS
        if expected_lhs_types.contains(&lhs_type) {
            return Ok(Box::new(ContainedByExpr {
                left: lhs,
                right: rhs,
            }));
        }

        // Check if can perform the operator with additional implicit casting
        for expected_type in expected_lhs_types.iter() {
            if !expected_type.has_implicit_cast_from(&lhs) {
                continue;
            }

            let casting = Box::new(CastExpr {
                value: lhs,
                result_type: expected_type.clone(),
            });

            return Ok(Box::new(ContainedByExpr {
                left: casting,
                right: rhs,
            }));
        }

        // Return error if this operator can't be performed even with implicit cast
        return Err(Diagnostic::error(&format!(
            "Operator `<@` can't be performed between types `{lhs_type}` and `{rhs_type}`"
        ))
        .with_location(operator.location)
        .as_boxed());
    }

    Ok(lhs)
}

fn parse_bitwise_shift_expression(