From 94c63d280246971983cad4fa6ce2d333e3ba9f02 Mon Sep 17 00:00:00 2001
From: Edwin Cheng <edwin0cheng@gmail.com>
Date: Tue, 19 Nov 2019 22:56:28 +0800
Subject: Change to use Expansion::file_id and reordering

---
 crates/ra_ide_api/src/expand_macro.rs | 79 +++++++++++++++++------------------
 1 file changed, 39 insertions(+), 40 deletions(-)

(limited to 'crates/ra_ide_api/src/expand_macro.rs')

diff --git a/crates/ra_ide_api/src/expand_macro.rs b/crates/ra_ide_api/src/expand_macro.rs
index 49c096ed5..bd557d455 100644
--- a/crates/ra_ide_api/src/expand_macro.rs
+++ b/crates/ra_ide_api/src/expand_macro.rs
@@ -11,33 +11,20 @@ use ra_syntax::{
     AstNode, NodeOrToken, SyntaxKind, SyntaxNode, WalkEvent,
 };
 
-fn insert_whitespaces(syn: SyntaxNode) -> String {
-    let mut res = String::new();
-
-    let mut token_iter = syn
-        .preorder_with_tokens()
-        .filter_map(|event| {
-            if let WalkEvent::Enter(NodeOrToken::Token(token)) = event {
-                Some(token)
-            } else {
-                None
-            }
-        })
-        .peekable();
+pub(crate) fn expand_macro(db: &RootDatabase, position: FilePosition) -> Option<(String, String)> {
+    let parse = db.parse(position.file_id);
+    let file = parse.tree();
+    let name_ref = find_node_at_offset::<ast::NameRef>(file.syntax(), position.offset)?;
+    let mac = name_ref.syntax().ancestors().find_map(ast::MacroCall::cast)?;
 
-    while let Some(token) = token_iter.next() {
-        res += &token.text().to_string();
-        if token.kind().is_keyword()
-            || token.kind().is_literal()
-            || token.kind() == SyntaxKind::IDENT
-        {
-            if !token_iter.peek().map(|it| it.kind().is_punct()).unwrap_or(false) {
-                res += " ";
-            }
-        }
-    }
+    let source = hir::Source::new(position.file_id.into(), mac.syntax());
+    let expanded = expand_macro_recur(db, source, &mac)?;
 
-    res
+    // FIXME:
+    // macro expansion may lose all white space information
+    // But we hope someday we can use ra_fmt for that
+    let res = insert_whitespaces(expanded);
+    Some((name_ref.text().to_string(), res))
 }
 
 fn expand_macro_recur(
@@ -47,14 +34,14 @@ fn expand_macro_recur(
 ) -> Option<SyntaxNode> {
     let analyzer = hir::SourceAnalyzer::new(db, source, None);
     let expansion = analyzer.expand(db, &macro_call)?;
-    let new_source = expansion.source(db);
-    let expanded: SyntaxNode = db.parse_or_expand(new_source.file_id)?;
+    let macro_file_id = expansion.file_id();
+    let expanded: SyntaxNode = db.parse_or_expand(macro_file_id)?;
 
     let children = expanded.descendants().filter_map(ast::MacroCall::cast);
     let mut replaces = FxHashMap::default();
 
     for child in children.into_iter() {
-        let source = new_source.with_ast(source.ast);
+        let source = hir::Source::new(macro_file_id, source.ast);
         let new_node = expand_macro_recur(db, source, &child)?;
 
         replaces.insert(child.syntax().clone().into(), new_node.into());
@@ -63,21 +50,33 @@ fn expand_macro_recur(
     Some(replace_descendants(&expanded, &replaces))
 }
 
-pub(crate) fn expand_macro(db: &RootDatabase, position: FilePosition) -> Option<(String, String)> {
-    let parse = db.parse(position.file_id);
-    let file = parse.tree();
-    let name_ref = find_node_at_offset::<ast::NameRef>(file.syntax(), position.offset)?;
-    let mac = name_ref.syntax().ancestors().find_map(ast::MacroCall::cast)?;
+fn insert_whitespaces(syn: SyntaxNode) -> String {
+    let mut res = String::new();
 
-    let source = hir::Source::new(position.file_id.into(), mac.syntax());
+    let mut token_iter = syn
+        .preorder_with_tokens()
+        .filter_map(|event| {
+            if let WalkEvent::Enter(NodeOrToken::Token(token)) = event {
+                Some(token)
+            } else {
+                None
+            }
+        })
+        .peekable();
 
-    let expanded = expand_macro_recur(db, source, &mac)?;
+    while let Some(token) = token_iter.next() {
+        res += &token.text().to_string();
+        if token.kind().is_keyword()
+            || token.kind().is_literal()
+            || token.kind() == SyntaxKind::IDENT
+        {
+            if !token_iter.peek().map(|it| it.kind().is_punct()).unwrap_or(false) {
+                res += " ";
+            }
+        }
+    }
 
-    // FIXME:
-    // macro expansion may lose all white space information
-    // But we hope someday we can use ra_fmt for that
-    let res = insert_whitespaces(expanded);
-    Some((name_ref.text().to_string(), res))
+    res
 }
 
 #[cfg(test)]
-- 
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