Make siblings an inherent method

crates/ra_syntax/src/algo/mod.rs

@@ -94,22 +94,6 @@ pub fn find_covering_node(root: SyntaxNodeRef, range: TextRange) -> SyntaxNodeRe
     common_ancestor(left, right)
 }
 
-#[derive(Debug)]
-pub enum Direction {
-    Forward,
-    Backward,
-}
-
-pub fn siblings<'a>(
-    node: SyntaxNodeRef<'a>,
-    direction: Direction
-) -> impl Iterator<Item=SyntaxNodeRef<'a>> {
-    generate(Some(node), move |&node| match direction {
-        Direction::Forward => node.next_sibling(),
-        Direction::Backward => node.prev_sibling(),
-    })
-}
-
 fn common_ancestor<'a>(n1: SyntaxNodeRef<'a>, n2: SyntaxNodeRef<'a>) -> SyntaxNodeRef<'a> {
     for p in n1.ancestors() {
         if n2.ancestors().any(|a| a == p) {

crates/ra_syntax/src/lib.rs

@@ -51,7 +51,7 @@ pub use {
     ast::AstNode,
     lexer::{tokenize, Token},
     syntax_kinds::SyntaxKind,
-    yellow::{SyntaxNode, SyntaxNodeRef, OwnedRoot, RefRoot, TreeRoot, SyntaxError},
+    yellow::{SyntaxNode, SyntaxNodeRef, OwnedRoot, RefRoot, TreeRoot, SyntaxError, Direction},
     reparsing::AtomEdit,
 };
 

crates/ra_syntax/src/yellow/mod.rs

@@ -58,6 +58,13 @@ impl SyntaxNode {
         SyntaxNode(::rowan::SyntaxNode::new(green, errors))
     }
 }
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Direction {
+    Next,
+    Prev,
+}
+
 impl<'a> SyntaxNodeRef<'a> {
     pub fn leaf_text(self) -> Option<&'a SmolStr> {
         self.0.leaf_text()
@@ -71,6 +78,12 @@ impl<'a> SyntaxNodeRef<'a> {
             ::algo::walk::WalkEvent::Exit(_) => None,
         })
     }
+    pub fn siblings(self, direction: Direction) -> impl Iterator<Item=SyntaxNodeRef<'a>> {
+        ::algo::generate(Some(self), move |&node| match direction {
+            Direction::Next => node.next_sibling(),
+            Direction::Prev => node.prev_sibling(),
+        })
+    }
 }
 
 impl<R: TreeRoot<RaTypes>> SyntaxNode<R> {