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-rw-r--r--crates/ide/src/expand_macro.rs23
1 files changed, 9 insertions, 14 deletions
diff --git a/crates/ide/src/expand_macro.rs b/crates/ide/src/expand_macro.rs
index be0ee03bf..eebae5ebe 100644
--- a/crates/ide/src/expand_macro.rs
+++ b/crates/ide/src/expand_macro.rs
@@ -3,9 +3,7 @@ use std::iter;
3use hir::Semantics; 3use hir::Semantics;
4use ide_db::RootDatabase; 4use ide_db::RootDatabase;
5use syntax::{ 5use syntax::{
6 algo::{find_node_at_offset, SyntaxRewriter}, 6 algo::find_node_at_offset, ast, ted, AstNode, NodeOrToken, SyntaxKind, SyntaxKind::*,
7 ast, AstNode, NodeOrToken, SyntaxKind,
8 SyntaxKind::*,
9 SyntaxNode, WalkEvent, T, 7 SyntaxNode, WalkEvent, T,
10}; 8};
11 9
@@ -46,26 +44,23 @@ fn expand_macro_recur(
46 sema: &Semantics<RootDatabase>, 44 sema: &Semantics<RootDatabase>,
47 macro_call: &ast::MacroCall, 45 macro_call: &ast::MacroCall,
48) -> Option<SyntaxNode> { 46) -> Option<SyntaxNode> {
49 let mut expanded = sema.expand(macro_call)?; 47 let expanded = sema.expand(macro_call)?.clone_for_update();
50 48
51 let children = expanded.descendants().filter_map(ast::MacroCall::cast); 49 let children = expanded.descendants().filter_map(ast::MacroCall::cast);
52 let mut rewriter = SyntaxRewriter::default(); 50 let mut replacements = Vec::new();
53 51
54 for child in children.into_iter() { 52 for child in children {
55 if let Some(new_node) = expand_macro_recur(sema, &child) { 53 if let Some(new_node) = expand_macro_recur(sema, &child) {
56 // Replace the whole node if it is root 54 // check if the whole original syntax is replaced
57 // `replace_descendants` will not replace the parent node
58 // but `SyntaxNode::descendants include itself
59 if expanded == *child.syntax() { 55 if expanded == *child.syntax() {
60 expanded = new_node; 56 return Some(new_node);
61 } else {
62 rewriter.replace(child.syntax(), &new_node)
63 } 57 }
58 replacements.push((child, new_node));
64 } 59 }
65 } 60 }
66 61
67 let res = rewriter.rewrite(&expanded); 62 replacements.into_iter().rev().for_each(|(old, new)| ted::replace(old.syntax(), new));
68 Some(res) 63 Some(expanded)
69} 64}
70 65
71// FIXME: It would also be cool to share logic here and in the mbe tests, 66// FIXME: It would also be cool to share logic here and in the mbe tests,