97 lines
3.3 KiB
Rust
97 lines
3.3 KiB
Rust
//! Span maps for real files and macro expansions.
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use span::{FileId, HirFileId, HirFileIdRepr, Span};
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use syntax::{AstNode, TextRange};
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use triomphe::Arc;
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pub use span::RealSpanMap;
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use crate::db::ExpandDatabase;
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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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#[inline]
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pub(crate) fn new(db: &dyn ExpandDatabase, file_id: HirFileId) -> SpanMap {
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match file_id.repr() {
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HirFileIdRepr::FileId(file_id) => SpanMap::RealSpanMap(db.real_span_map(file_id)),
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HirFileIdRepr::MacroFile(m) => {
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SpanMap::ExpansionSpanMap(db.parse_macro_expansion(m).value.1)
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}
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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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pub(crate) fn real_span_map(db: &dyn ExpandDatabase, file_id: FileId) -> Arc<RealSpanMap> {
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use syntax::ast::HasModuleItem;
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let mut pairs = vec![(syntax::TextSize::new(0), span::ROOT_ERASED_FILE_AST_ID)];
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let ast_id_map = db.ast_id_map(file_id.into());
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let tree = db.parse(file_id).tree();
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// FIXME: Descend into modules and other item containing items that are not annotated with attributes
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// and allocate pairs for those as well. This gives us finer grained span anchors resulting in
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// better incrementality
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pairs.extend(
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tree.items()
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.map(|item| (item.syntax().text_range().start(), ast_id_map.ast_id(&item).erase())),
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);
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Arc::new(RealSpanMap::from_file(
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file_id,
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pairs.into_boxed_slice(),
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tree.syntax().text_range().end(),
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))
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}
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