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Erlend Tobiassen 2019-01-27 14:49:02 +01:00
parent 5052bf9889
commit e2e1f4ceca
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4
crates/ra_syntax/src/algo.rs
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@ -17,14 +17,14 @@ 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 /// 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, /// imprecise: if the cursor is strictly between two nodes of the desired type,
/// as in /// as in
/// ///
/// ```no-run /// ```no-run
/// struct Foo {}|struct Bar; /// struct Foo {}|struct Bar;
/// ``` /// ```
/// ///
/// then the left node will be silently prefered. /// then the left node will be silently preferred.
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))
} }