pymeta 0.1.0-alpha.1

Metaprogramming Rust in Python!
Documentation 
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use proc_macro2::Span;

pub(crate) mod logging;
pub(crate) mod py_source;
pub(crate) mod rust_token;
pub(crate) mod escape;

pub(crate) trait SpanOptionEx {
    fn join_or_fallback(self, other: Self) -> Span;
}
impl SpanOptionEx for Option<Span> {
    fn join_or_fallback(self, other: Self) -> Span {
        match (self, other) {
            (Some(lhs), Some(rhs)) => lhs.join(rhs).unwrap_or_else(Span::call_site),
            (Some(lhs), None) => lhs,
            (None, Some(rhs)) => rhs,
            (None, None) => Span::call_site(),
        }
    }
}

pub(crate) trait SpanEx {
    fn join_or_fallback(self, other: Option<Span>) -> Span;
}
impl SpanEx for Span {
    fn join_or_fallback(self, other: Option<Span>) -> Span {
        Some(self).join_or_fallback(other)
    }
}

macro_rules! match_unwrap {
    ($var:ident in $pattern:pat = $expr:expr) => {{
        let $pattern = $expr else { unreachable!() };
        $var
    }};
}
pub(crate) use match_unwrap;


#[cfg(feature = "nightly_proc_macro_span")]
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
pub(crate) struct LineColumn {
    /// 1-indexed
    pub line: u32,
    /// 0-indexed
    pub column: u32,
}

#[cfg(feature = "nightly_proc_macro_span")]
impl From<proc_macro2::LineColumn> for LineColumn {
    fn from(value: proc_macro2::LineColumn) -> Self {
        Self {
            line: value.line as u32,
            column: value.column as u32,
        }
    }
}

#[cfg(feature = "nightly_proc_macro_span")]
impl From<LineColumn> for proc_macro2::LineColumn {
    fn from(value: LineColumn) -> Self {
        Self {
            line: value.line as usize,
            column: value.column as usize,
        }
    }
}