Function parse_order_by_nulls_policy

crates/gitql-parser/src/parse_ordering.rs:109–144

(
    tokens: &[Token],
    position: &mut usize,
    sorting_order: &SortingOrder,
)

}

fn parse_order_by_nulls_policy(
    tokens: &[Token],
    position: &mut usize,
    sorting_order: &SortingOrder,
) -> Result<NullsOrderPolicy, Box<Diagnostic>> {
    // Check for `NULLs FIRST` or `NULLs LAST`
    if is_current_token(tokens, position, TokenKind::Nulls) {
        // Consume `NULLs` keyword
        *position += 1;

        // Consume `FIRST` and return NUlls First policy
        if is_current_token(tokens, position, TokenKind::First) {
            *position += 1;
            return Ok(NullsOrderPolicy::NullsFirst);
        }

        // Consume `LAST` and return NUlls Last policy
        if is_current_token(tokens, position, TokenKind::Last) {
            *position += 1;
            return Ok(NullsOrderPolicy::NullsLast);
        }

        return Err(Diagnostic::error("Unexpected NULL ordering policy")
            .add_note("Null ordering policy must be `FIRST` or `LAST`")
            .add_help("Please use `NULL FIRST` or `NULL LAST`")
            .with_location(tokens[*position].location)
            .as_boxed());
    }

    let default_null_ordering_policy = match sorting_order {
        SortingOrder::Ascending => NullsOrderPolicy::NullsLast,
        SortingOrder::Descending => NullsOrderPolicy::NullsFirst,
    };

    Ok(default_null_ordering_policy)
}

#[inline(always)]
fn is_order_by_using_operator(token: &Token) -> bool {