From 702bdacb03b498f36ed9ccf4f37ca923affb1e9c Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Tue, 8 Jan 2019 20:44:31 +0300
Subject: move node at offset to aglo already
---
crates/ra_syntax/src/algo.rs | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
(limited to 'crates/ra_syntax')
diff --git a/crates/ra_syntax/src/algo.rs b/crates/ra_syntax/src/algo.rs
index 13f50d2ef..2826ec7f2 100644
--- a/crates/ra_syntax/src/algo.rs
+++ b/crates/ra_syntax/src/algo.rs
@@ -2,7 +2,7 @@ pub mod visit;
use rowan::TransparentNewType;
-use crate::{SyntaxNode, TextRange, TextUnit};
+use crate::{SyntaxNode, TextRange, TextUnit, AstNode};
pub use rowan::LeafAtOffset;
@@ -16,6 +16,10 @@ pub fn find_leaf_at_offset(node: &SyntaxNode, offset: TextUnit) -> LeafAtOffset<
}
}
+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))
+}
+
pub fn find_covering_node(root: &SyntaxNode, range: TextRange) -> &SyntaxNode {
SyntaxNode::from_repr(root.0.covering_node(range))
}
--
cgit v1.2.3
From 0c88360eb46c44935421c5d4bc36910ce3e96782 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Tue, 8 Jan 2019 20:47:37 +0300
Subject: add comment
---
crates/ra_syntax/src/algo.rs | 9 +++++++++
1 file changed, 9 insertions(+)
(limited to 'crates/ra_syntax')
diff --git a/crates/ra_syntax/src/algo.rs b/crates/ra_syntax/src/algo.rs
index 2826ec7f2..45747e21d 100644
--- a/crates/ra_syntax/src/algo.rs
+++ b/crates/ra_syntax/src/algo.rs
@@ -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> {
find_leaf_at_offset(syntax, offset).find_map(|leaf| leaf.ancestors().find_map(N::cast))
}
--
cgit v1.2.3