66 lines
2.0 KiB
Rust
66 lines
2.0 KiB
Rust
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//! Span maps for real files and macro expansions.
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use span::Span;
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use syntax::TextRange;
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use triomphe::Arc;
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pub use span::RealSpanMap;
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pub type ExpansionSpanMap = span::SpanMap<Span>;
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/// Spanmap for a macro file or a real file
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#[derive(Clone, Debug, PartialEq, Eq)]
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pub enum SpanMap {
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/// Spanmap for a macro file
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ExpansionSpanMap(Arc<ExpansionSpanMap>),
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/// Spanmap for a real file
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RealSpanMap(Arc<RealSpanMap>),
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}
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#[derive(Copy, Clone)]
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pub enum SpanMapRef<'a> {
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/// Spanmap for a macro file
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ExpansionSpanMap(&'a ExpansionSpanMap),
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/// Spanmap for a real file
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RealSpanMap(&'a RealSpanMap),
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}
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impl mbe::SpanMapper<Span> for SpanMap {
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fn span_for(&self, range: TextRange) -> Span {
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self.span_for_range(range)
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}
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}
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impl mbe::SpanMapper<Span> for SpanMapRef<'_> {
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fn span_for(&self, range: TextRange) -> Span {
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self.span_for_range(range)
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}
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}
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impl SpanMap {
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pub fn span_for_range(&self, range: TextRange) -> Span {
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match self {
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// FIXME: Is it correct for us to only take the span at the start? This feels somewhat
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// wrong. The context will be right, but the range could be considered wrong. See
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// https://github.com/rust-lang/rust/issues/23480, we probably want to fetch the span at
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// the start and end, then merge them like rustc does in `Span::to
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Self::ExpansionSpanMap(span_map) => span_map.span_at(range.start()),
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Self::RealSpanMap(span_map) => span_map.span_for_range(range),
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}
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}
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pub fn as_ref(&self) -> SpanMapRef<'_> {
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match self {
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Self::ExpansionSpanMap(span_map) => SpanMapRef::ExpansionSpanMap(span_map),
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Self::RealSpanMap(span_map) => SpanMapRef::RealSpanMap(span_map),
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}
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}
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}
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impl SpanMapRef<'_> {
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pub fn span_for_range(self, range: TextRange) -> Span {
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match self {
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Self::ExpansionSpanMap(span_map) => span_map.span_at(range.start()),
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Self::RealSpanMap(span_map) => span_map.span_for_range(range),
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}
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}
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}
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