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Aleksey Kladov 2019-01-08 20:47:37 +03:00
parent 13301f284c
commit 0c88360eb4
1 changed files with 9 additions and 0 deletions
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9
crates/ra_syntax/src/algo.rs
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@ -16,6 +16,15 @@ pub fn find_leaf_at_offset(node: &SyntaxNode, offset: TextUnit) -> LeafAtOffset<
} }
} }
/// Finds a node of specific Ast type at offset. Note that this is slightly
/// impercise: if the cursor is strictly betwen two nodes of the desired type,
/// as in
///
/// ```no-run
/// struct Foo {}|struct Bar;
/// ```
///
/// then the left node will be silently prefered.
pub fn find_node_at_offset<N: AstNode>(syntax: &SyntaxNode, offset: TextUnit) -> Option<&N> { pub fn find_node_at_offset<N: AstNode>(syntax: &SyntaxNode, offset: TextUnit) -> Option<&N> {
find_leaf_at_offset(syntax, offset).find_map(|leaf| leaf.ancestors().find_map(N::cast)) find_leaf_at_offset(syntax, offset).find_map(|leaf| leaf.ancestors().find_map(N::cast))
} }