8 files changed, 38 insertions, 44 deletions

diff --git a/crates/ra_editor/src/code_actions.rs b/crates/ra_editor/src/code_actions.rs
index 83f7956d2..216d592ff 100644
--- a/crates/ra_editor/src/code_actions.rs
+++ b/crates/ra_editor/src/code_actions.rs
@@ -1,15 +1,13 @@
 use join_to_string::join;
 
 use ra_syntax::{
-    File, TextUnit, TextRange,
+    File, TextUnit, TextRange, Direction,
     ast::{self, AstNode, AttrsOwner, TypeParamsOwner, NameOwner},
     SyntaxKind::{COMMA, WHITESPACE},
     SyntaxNodeRef,
     algo::{
-        Direction, siblings,
         find_leaf_at_offset,
         find_covering_node,
-        ancestors,
     },
 };
 
@@ -25,12 +23,12 @@ pub fn flip_comma<'a>(file: &'a File, offset: TextUnit) -> Option<impl FnOnce()
     let syntax = file.syntax();
 
     let comma = find_leaf_at_offset(syntax, offset).find(|leaf| leaf.kind() == COMMA)?;
-    let left = non_trivia_sibling(comma, Direction::Backward)?;
-    let right = non_trivia_sibling(comma, Direction::Forward)?;
+    let prev = non_trivia_sibling(comma, Direction::Prev)?;
+    let next = non_trivia_sibling(comma, Direction::Next)?;
     Some(move || {
         let mut edit = EditBuilder::new();
-        edit.replace(left.range(), right.text().to_string());
-        edit.replace(right.range(), left.text().to_string());
+        edit.replace(prev.range(), next.text().to_string());
+        edit.replace(next.range(), prev.text().to_string());
         LocalEdit {
             edit: edit.finish(),
             cursor_position: None,
@@ -101,8 +99,8 @@ pub fn add_impl<'a>(file: &'a File, offset: TextUnit) -> Option<impl FnOnce() ->
 
 pub fn introduce_variable<'a>(file: &'a File, range: TextRange) -> Option<impl FnOnce() -> LocalEdit + 'a> {
     let node = find_covering_node(file.syntax(), range);
-    let expr = ancestors(node).filter_map(ast::Expr::cast).next()?;
-    let anchor_stmt = ancestors(expr.syntax()).filter_map(ast::Stmt::cast).next()?;
+    let expr = node.ancestors().filter_map(ast::Expr::cast).next()?;
+    let anchor_stmt = expr.syntax().ancestors().filter_map(ast::Stmt::cast).next()?;
     let indent = anchor_stmt.syntax().prev_sibling()?;
     if indent.kind() != WHITESPACE {
         return None;
@@ -130,7 +128,7 @@ pub fn introduce_variable<'a>(file: &'a File, range: TextRange) -> Option<impl F
 }
 
 fn non_trivia_sibling(node: SyntaxNodeRef, direction: Direction) -> Option<SyntaxNodeRef> {
-    siblings(node, direction)
+    node.siblings(direction)
         .skip(1)
         .find(|node| !node.kind().is_trivia())
 }
diff --git a/crates/ra_editor/src/completion.rs b/crates/ra_editor/src/completion.rs
index ff9de20d3..62a63fb04 100644
--- a/crates/ra_editor/src/completion.rs
+++ b/crates/ra_editor/src/completion.rs
@@ -4,7 +4,6 @@ use ra_syntax::{
     File, TextUnit, AstNode, SyntaxNodeRef, SyntaxKind::*,
     ast::{self, LoopBodyOwner, ModuleItemOwner},
     algo::{
-        ancestors,
         visit::{visitor, Visitor, visitor_ctx, VisitorCtx},
     },
     text_utils::is_subrange,
@@ -59,7 +58,7 @@ fn complete_name_ref(file: &File, name_ref: ast::NameRef, acc: &mut Vec<Completi
         return;
     }
     let mut visited_fn = false;
-    for node in ancestors(name_ref.syntax()) {
+    for node in name_ref.syntax().ancestors() {
         if let Some(items) = visitor()
             .visit::<ast::Root, _>(|it| Some(it.items()))
             .visit::<ast::Module, _>(|it| Some(it.item_list()?.items()))
@@ -92,7 +91,7 @@ fn complete_name_ref(file: &File, name_ref: ast::NameRef, acc: &mut Vec<Completi
 
 fn param_completions(ctx: SyntaxNodeRef, acc: &mut Vec<CompletionItem>) {
     let mut params = HashMap::new();
-    for node in ancestors(ctx) {
+    for node in ctx.ancestors() {
         let _ = visitor_ctx(&mut params)
             .visit::<ast::Root, _>(process)
             .visit::<ast::ItemList, _>(process)
@@ -123,7 +122,7 @@ fn param_completions(ctx: SyntaxNodeRef, acc: &mut Vec<CompletionItem>) {
 }
 
 fn is_node<'a, N: AstNode<'a>>(node: SyntaxNodeRef<'a>) -> bool {
-    match ancestors(node).filter_map(N::cast).next() {
+    match node.ancestors().filter_map(N::cast).next() {
         None => false,
         Some(n) => n.syntax().range() == node.range(),
     }
@@ -152,7 +151,7 @@ fn complete_expr_keywords(file: &File, fn_def: ast::FnDef, name_ref: ast::NameRe
 }
 
 fn is_in_loop_body(name_ref: ast::NameRef) -> bool {
-    for node in ancestors(name_ref.syntax()) {
+    for node in name_ref.syntax().ancestors() {
         if node.kind() == FN_DEF || node.kind() == LAMBDA_EXPR {
             break;
         }
@@ -171,7 +170,7 @@ fn is_in_loop_body(name_ref: ast::NameRef) -> bool {
 }
 
 fn complete_return(fn_def: ast::FnDef, name_ref: ast::NameRef) -> Option<CompletionItem> {
-    // let is_last_in_block = ancestors(name_ref.syntax()).filter_map(ast::Expr::cast)
+    // let is_last_in_block = name_ref.syntax().ancestors().filter_map(ast::Expr::cast)
     //     .next()
     //     .and_then(|it| it.syntax().parent())
     //     .and_then(ast::Block::cast)
@@ -181,7 +180,7 @@ fn complete_return(fn_def: ast::FnDef, name_ref: ast::NameRef) -> Option<Complet
     //     return None;
     // }
 
-    let is_stmt = match ancestors(name_ref.syntax()).filter_map(ast::ExprStmt::cast).next() {
+    let is_stmt = match name_ref.syntax().ancestors().filter_map(ast::ExprStmt::cast).next() {
         None => false,
         Some(expr_stmt) => expr_stmt.syntax().range() == name_ref.syntax().range()
     };
diff --git a/crates/ra_editor/src/extend_selection.rs b/crates/ra_editor/src/extend_selection.rs
index dc914a26a..b00a457b9 100644
--- a/crates/ra_editor/src/extend_selection.rs
+++ b/crates/ra_editor/src/extend_selection.rs
@@ -1,7 +1,7 @@
 use ra_syntax::{
-    File, TextRange, SyntaxNodeRef, TextUnit,
+    File, TextRange, SyntaxNodeRef, TextUnit, Direction,
     SyntaxKind::*,
-    algo::{find_leaf_at_offset, LeafAtOffset, find_covering_node, ancestors, Direction, siblings},
+    algo::{find_leaf_at_offset, LeafAtOffset, find_covering_node},
 };
 
 pub fn extend_selection(file: &File, range: TextRange) -> Option<TextRange> {
@@ -30,7 +30,7 @@ pub(crate) fn extend(root: SyntaxNodeRef, range: TextRange) -> Option<TextRange>
         }
     }
 
-    match ancestors(node).skip_while(|n| n.range() == range).next() {
+    match node.ancestors().skip_while(|n| n.range() == range).next() {
         None => None,
         Some(parent) => Some(parent.range()),
     }
@@ -71,12 +71,12 @@ fn pick_best<'a>(l: SyntaxNodeRef<'a>, r: SyntaxNodeRef<'a>) -> SyntaxNodeRef<'a
 }
 
 fn extend_comments(node: SyntaxNodeRef) -> Option<TextRange> {
-    let left = adj_comments(node, Direction::Backward);
-    let right = adj_comments(node, Direction::Forward);
-    if left != right {
+    let prev = adj_comments(node, Direction::Prev);
+    let next = adj_comments(node, Direction::Next);
+    if prev != next {
         Some(TextRange::from_to(
-            left.range().start(),
-            right.range().end(),
+            prev.range().start(),
+            next.range().end(),
         ))
     } else {
         None
@@ -85,7 +85,7 @@ fn extend_comments(node: SyntaxNodeRef) -> Option<TextRange> {
 
 fn adj_comments(node: SyntaxNodeRef, dir: Direction) -> SyntaxNodeRef {
     let mut res = node;
-    for node in siblings(node, dir) {
+    for node in node.siblings(dir) {
         match node.kind() {
             COMMENT => res = node,
             WHITESPACE if !node.leaf_text().unwrap().as_str().contains("\n\n") => (),
diff --git a/crates/ra_editor/src/folding_ranges.rs b/crates/ra_editor/src/folding_ranges.rs
index 817da28d1..733512368 100644
--- a/crates/ra_editor/src/folding_ranges.rs
+++ b/crates/ra_editor/src/folding_ranges.rs
@@ -3,7 +3,7 @@ use std::collections::HashSet;
 use ra_syntax::{
     File, TextRange, SyntaxNodeRef,
     SyntaxKind,
-    algo::{walk, Direction, siblings},
+    Direction,
 };
 
 #[derive(Debug, PartialEq, Eq)]
@@ -19,12 +19,10 @@ pub struct Fold {
 }
 
 pub fn folding_ranges(file: &File) -> Vec<Fold> {
-    let syntax = file.syntax();
-
     let mut res = vec![];
     let mut visited = HashSet::new();
 
-    for node in walk::preorder(syntax) {
+    for node in file.syntax().descendants() {
         if visited.contains(&node) {
             continue;
         }
@@ -64,7 +62,7 @@ fn contiguous_range_for<'a>(
 
     let left = node;
     let mut right = node;
-    for node in siblings(node, Direction::Forward) {
+    for node in node.siblings(Direction::Next) {
         visited.insert(node);
         match node.kind() {
             SyntaxKind::WHITESPACE if !node.leaf_text().unwrap().as_str().contains("\n\n") => (),
@@ -139,4 +137,4 @@ fn main() {
     }
 
 
-}
\ No newline at end of file
+}
diff --git a/crates/ra_editor/src/lib.rs b/crates/ra_editor/src/lib.rs
index de929d73a..a93924e00 100644
--- a/crates/ra_editor/src/lib.rs
+++ b/crates/ra_editor/src/lib.rs
@@ -21,7 +21,7 @@ mod test_utils;
 use ra_syntax::{
     File, TextUnit, TextRange, SyntaxNodeRef,
     ast::{self, AstNode, NameOwner},
-    algo::{walk, find_leaf_at_offset, ancestors},
+    algo::find_leaf_at_offset,
     SyntaxKind::{self, *},
 };
 pub use ra_syntax::AtomEdit;
@@ -86,7 +86,7 @@ pub fn matching_brace(file: &File, offset: TextUnit) -> Option<TextUnit> {
 
 pub fn highlight(file: &File) -> Vec<HighlightedRange> {
     let mut res = Vec::new();
-    for node in walk::preorder(file.syntax()) {
+    for node in file.syntax().descendants() {
         let tag = match node.kind() {
             ERROR => "error",
             COMMENT | DOC_COMMENT => "comment",
@@ -110,7 +110,7 @@ pub fn highlight(file: &File) -> Vec<HighlightedRange> {
 pub fn diagnostics(file: &File) -> Vec<Diagnostic> {
     let mut res = Vec::new();
 
-    for node in walk::preorder(file.syntax()) {
+    for node in file.syntax().descendants() {
         if node.kind() == ERROR {
             res.push(Diagnostic {
                 range: node.range(),
@@ -130,7 +130,7 @@ pub fn syntax_tree(file: &File) -> String {
 }
 
 pub fn runnables(file: &File) -> Vec<Runnable> {
-    walk::preorder(file.syntax())
+    file.syntax().descendants()
         .filter_map(ast::FnDef::cast)
         .filter_map(|f| {
             let name = f.name()?.text();
@@ -159,7 +159,7 @@ pub fn find_node_at_offset<'a, N: AstNode<'a>>(
     let leaf = leaves.clone()
         .find(|leaf| !leaf.kind().is_trivia())
         .or_else(|| leaves.right_biased())?;
-    ancestors(leaf)
+    leaf.ancestors()
         .filter_map(N::cast)
         .next()
 }
diff --git a/crates/ra_editor/src/scope/fn_scope.rs b/crates/ra_editor/src/scope/fn_scope.rs
index 3ae5276a2..eddd87495 100644
--- a/crates/ra_editor/src/scope/fn_scope.rs
+++ b/crates/ra_editor/src/scope/fn_scope.rs
@@ -6,7 +6,7 @@ use std::{
 use ra_syntax::{
     SyntaxNodeRef, SyntaxNode, SmolStr, AstNode,
     ast::{self, NameOwner, LoopBodyOwner, ArgListOwner},
-    algo::{ancestors, generate, walk::preorder}
+    algo::{generate}
 };
 
 type ScopeId = usize;
@@ -51,7 +51,7 @@ impl FnScopes {
         res
     }
     fn add_bindings(&mut self, scope: ScopeId, pat: ast::Pat) {
-        let entries = preorder(pat.syntax())
+        let entries = pat.syntax().descendants()
             .filter_map(ast::BindPat::cast)
             .filter_map(ScopeEntry::new);
         self.scopes[scope].entries.extend(entries);
@@ -66,7 +66,7 @@ impl FnScopes {
         self.scope_for.insert(node.owned(), scope);
     }
     fn scope_for(&self, node: SyntaxNodeRef) -> Option<ScopeId> {
-        ancestors(node)
+        node.ancestors()
             .filter_map(|it| self.scope_for.get(&it.owned()).map(|&scope| scope))
             .next()
     }
diff --git a/crates/ra_editor/src/symbols.rs b/crates/ra_editor/src/symbols.rs
index 917984177..e5cc5ca28 100644
--- a/crates/ra_editor/src/symbols.rs
+++ b/crates/ra_editor/src/symbols.rs
@@ -3,7 +3,7 @@ use ra_syntax::{
     ast::{self, NameOwner},
     algo::{
         visit::{visitor, Visitor},
-        walk::{walk, WalkEvent, preorder},
+        walk::{walk, WalkEvent},
     },
 };
 use TextRange;
@@ -25,7 +25,7 @@ pub struct FileSymbol {
 }
 
 pub fn file_symbols(file: &File) -> Vec<FileSymbol> {
-    preorder(file.syntax())
+    file.syntax().descendants()
         .filter_map(to_symbol)
         .collect()
 }
diff --git a/crates/ra_editor/src/typing.rs b/crates/ra_editor/src/typing.rs
index 0f4e7e0d0..512076941 100644
--- a/crates/ra_editor/src/typing.rs
+++ b/crates/ra_editor/src/typing.rs
@@ -4,7 +4,6 @@ use ra_syntax::{
     TextUnit, TextRange, SyntaxNodeRef, File, AstNode, SyntaxKind,
     ast,
     algo::{
-        walk::preorder,
         find_covering_node,
     },
     text_utils::{intersect, contains_offset_nonstrict},
@@ -33,7 +32,7 @@ pub fn join_lines(file: &File, range: TextRange) -> LocalEdit {
     };
     let node = find_covering_node(file.syntax(), range);
     let mut edit = EditBuilder::new();
-    for node in preorder(node) {
+    for node in node.descendants() {
         let text = match node.leaf_text() {
             Some(text) => text,
             None => continue,