Function parse_expr

libs/@local/hashql/syntax-jexpr/src/parser/string/expr.rs:182–205

super limited set of expressions that are supported in strings for convenience

(
    input: &mut Input<'heap, 'span, 'source>,
)

// super limited set of expressions that are supported in strings for convenience
pub(crate) fn parse_expr<'heap, 'span, 'source, E>(
    input: &mut Input<'heap, 'span, 'source>,
) -> ModalResult<Expr<'heap>, E>
where
    E: ParserError<Input<'heap, 'span, 'source>>
        + FromExternalError<Input<'heap, 'span, 'source>, ParseIntError>
        + AddContext<Input<'heap, 'span, 'source>, StrContext>,
{
    let alt = alt((
        terminated('_', ws(eof)).span().map(Alt2::Left),
        parse_expr_path.map(Alt2::Right),
    ))
    .context(StrContext::Label("expression"))
    .parse_next(input)?;

    match alt {
        Alt2::Left(span) => Ok(Expr {
            id: NodeId::PLACEHOLDER,
            span: input.state.span(span),
            kind: ExprKind::Underscore,
        }),
        Alt2::Right(right) => Ok(right),
    }
}

#[cfg(test)]
mod tests {