internal: remove dead code

crates/mbe/src/syntax_bridge.rs

@@ -705,8 +705,8 @@ mod tests {
     use crate::tests::parse_macro;
     use parser::TokenSource;
     use syntax::{
-        algo::{insert_children, InsertPosition},
+        ast::{make, AstNode},
-        ast::AstNode,
+        ted,
     };
     use test_utils::assert_eq_text;
 
@@ -772,42 +772,26 @@ mod tests {
 
     #[test]
     fn test_token_tree_last_child_is_white_space() {
-        let source_file = ast::SourceFile::parse("f!({} );").ok().unwrap();
+        let source_file = ast::SourceFile::parse("f!{}").ok().unwrap();
         let macro_call = source_file.syntax().descendants().find_map(ast::MacroCall::cast).unwrap();
         let token_tree = macro_call.token_tree().unwrap();
 
         // Token Tree now is :
         // TokenTree
-        // - T!['(']
         // - TokenTree
         //   - T!['{']
         //   - T!['}']
-        // - WHITE_SPACE
-        // - T![')']
-
-        let rbrace =
-            token_tree.syntax().descendants_with_tokens().find(|it| it.kind() == T!['}']).unwrap();
-        let space = token_tree
-            .syntax()
-            .descendants_with_tokens()
-            .find(|it| it.kind() == SyntaxKind::WHITESPACE)
-            .unwrap();
-
-        // reorder th white space, such that the white is inside the inner token-tree.
-        let token_tree = insert_children(
-            &rbrace.parent().unwrap(),
-            InsertPosition::Last,
-            std::iter::once(space),
-        );
 
+        let token_tree = token_tree.clone_for_update();
+        ted::append_child(token_tree.syntax(), make::tokens::single_space());
+        let token_tree = token_tree.clone_subtree();
         // Token Tree now is :
         // TokenTree
         // - T!['{']
         // - T!['}']
         // - WHITE_SPACE
-        let token_tree = ast::TokenTree::cast(token_tree).unwrap();
-        let tt = syntax_node_to_token_tree(token_tree.syntax()).0;
 
+        let tt = syntax_node_to_token_tree(token_tree.syntax()).0;
         assert_eq!(tt.delimiter_kind(), Some(tt::DelimiterKind::Brace));
     }
 

crates/syntax/src/algo.rs

@@ -8,8 +8,8 @@ use rustc_hash::FxHashMap;
 use text_edit::TextEditBuilder;
 
 use crate::{
-    AstNode, Direction, NodeOrToken, SyntaxElement, SyntaxKind, SyntaxNode, SyntaxNodePtr,
+    AstNode, Direction, NodeOrToken, SyntaxElement, SyntaxKind, SyntaxNode, SyntaxToken, TextRange,
-    SyntaxToken, TextRange, TextSize,
+    TextSize,
 };
 
 /// Returns ancestors of the node at the offset, sorted by length. This should
@@ -92,14 +92,6 @@ pub fn has_errors(node: &SyntaxNode) -> bool {
     node.children().any(|it| it.kind() == SyntaxKind::ERROR)
 }
 
-#[derive(Debug, PartialEq, Eq, Clone, Copy)]
-pub enum InsertPosition<T> {
-    First,
-    Last,
-    Before(T),
-    After(T),
-}
-
 type FxIndexMap<K, V> = IndexMap<K, V, BuildHasherDefault<rustc_hash::FxHasher>>;
 
 #[derive(Debug, Hash, PartialEq, Eq)]
@@ -250,87 +242,6 @@ pub fn diff(from: &SyntaxNode, to: &SyntaxNode) -> TreeDiff {
     }
 }
 
-/// Adds specified children (tokens or nodes) to the current node at the
-/// specific position.
-///
-/// This is a type-unsafe low-level editing API, if you need to use it,
-/// prefer to create a type-safe abstraction on top of it instead.
-pub fn insert_children(
-    parent: &SyntaxNode,
-    position: InsertPosition<SyntaxElement>,
-    to_insert: impl IntoIterator<Item = SyntaxElement>,
-) -> SyntaxNode {
-    let mut to_insert = to_insert.into_iter();
-    _insert_children(parent, position, &mut to_insert)
-}
-
-fn _insert_children(
-    parent: &SyntaxNode,
-    position: InsertPosition<SyntaxElement>,
-    to_insert: &mut dyn Iterator<Item = SyntaxElement>,
-) -> SyntaxNode {
-    let mut delta = TextSize::default();
-    let to_insert = to_insert.map(|element| {
-        delta += element.text_range().len();
-        to_green_element(element)
-    });
-
-    let parent_green = parent.green();
-    let mut old_children = parent_green.children().map(|it| match it {
-        NodeOrToken::Token(it) => NodeOrToken::Token(it.to_owned()),
-        NodeOrToken::Node(it) => NodeOrToken::Node(it.to_owned()),
-    });
-
-    let new_children = match &position {
-        InsertPosition::First => to_insert.chain(old_children).collect::<Vec<_>>(),
-        InsertPosition::Last => old_children.chain(to_insert).collect::<Vec<_>>(),
-        InsertPosition::Before(anchor) | InsertPosition::After(anchor) => {
-            let take_anchor = if let InsertPosition::After(_) = position { 1 } else { 0 };
-            let split_at = position_of_child(parent, anchor.clone()) + take_anchor;
-            let before = old_children.by_ref().take(split_at).collect::<Vec<_>>();
-            before.into_iter().chain(to_insert).chain(old_children).collect::<Vec<_>>()
-        }
-    };
-
-    with_children(parent, new_children)
-}
-
-fn with_children(
-    parent: &SyntaxNode,
-    new_children: Vec<NodeOrToken<rowan::GreenNode, rowan::GreenToken>>,
-) -> SyntaxNode {
-    let _p = profile::span("with_children");
-
-    let new_green = rowan::GreenNode::new(rowan::SyntaxKind(parent.kind() as u16), new_children);
-    with_green(parent, new_green)
-}
-
-fn with_green(syntax_node: &SyntaxNode, green: rowan::GreenNode) -> SyntaxNode {
-    let len = green.children().map(|it| it.text_len()).sum::<TextSize>();
-    let new_root_node = syntax_node.replace_with(green);
-    let new_root_node = SyntaxNode::new_root(new_root_node);
-
-    // FIXME: use a more elegant way to re-fetch the node (#1185), make
-    // `range` private afterwards
-    let mut ptr = SyntaxNodePtr::new(syntax_node);
-    ptr.range = TextRange::at(ptr.range.start(), len);
-    ptr.to_node(&new_root_node)
-}
-
-fn position_of_child(parent: &SyntaxNode, child: SyntaxElement) -> usize {
-    parent
-        .children_with_tokens()
-        .position(|it| it == child)
-        .expect("element is not a child of current element")
-}
-
-fn to_green_element(element: SyntaxElement) -> NodeOrToken<rowan::GreenNode, rowan::GreenToken> {
-    match element {
-        NodeOrToken::Node(it) => it.green().into(),
-        NodeOrToken::Token(it) => it.green().to_owned().into(),
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use expect_test::{expect, Expect};

crates/syntax/src/lib.rs

@@ -47,7 +47,6 @@ use stdx::format_to;
 use text_edit::Indel;
 
 pub use crate::{
-    algo::InsertPosition,
     ast::{AstNode, AstToken},
     parsing::lexer::{lex_single_syntax_kind, lex_single_valid_syntax_kind, tokenize, Token},
     ptr::{AstPtr, SyntaxNodePtr},