Merge #143

143: Implement Find All References and Rename for local variables r=matklad a=kjeremy

Expose `find_all_refs` in `Analysis`. This currently only works for local variables.

Use this in the LSP to implement find all references and rename.

Co-authored-by: Jeremy A. Kolb <[email protected]>

2 files changed, 35 insertions, 0 deletions

diff --git a/crates/ra_analysis/src/imp.rs b/crates/ra_analysis/src/imp.rs
index f1403cb5d..a67b1717a 100644
--- a/crates/ra_analysis/src/imp.rs
+++ b/crates/ra_analysis/src/imp.rs
@@ -257,6 +257,38 @@ impl AnalysisImpl {
         vec![]
     }
 
+    pub fn find_all_refs(&self, file_id: FileId, offset: TextUnit, _token: &JobToken) -> Vec<(FileId, TextRange)> {
+        let root = self.root(file_id);
+        let file = root.syntax(file_id);
+        let syntax = file.syntax();
+
+        let mut ret = vec![];
+
+        // Find the symbol we are looking for
+        if let Some(name_ref) = find_node_at_offset::<ast::NameRef>(syntax, offset) {
+
+            // We are only handing local references for now
+            if let Some(resolved) = resolve_local_name(&file, offset, name_ref) {
+
+                ret.push((file_id, resolved.1));
+
+                if let Some(fn_def) = find_node_at_offset::<ast::FnDef>(syntax, offset) {
+
+                    let refs : Vec<_> = fn_def.syntax().descendants()
+                        .filter_map(ast::NameRef::cast)
+                        .filter(|n: &ast::NameRef| resolve_local_name(&file, n.syntax().range().start(), *n) == Some(resolved.clone()))
+                        .collect();
+
+                    for r in refs {
+                        ret.push((file_id, r.syntax().range()));
+                    }
+                }
+            }
+        }
+
+        ret
+    }
+
     pub fn diagnostics(&self, file_id: FileId) -> Vec<Diagnostic> {
         let root = self.root(file_id);
         let module_tree = root.module_tree();
diff --git a/crates/ra_analysis/src/lib.rs b/crates/ra_analysis/src/lib.rs
index 2eeacaabe..46cc0722b 100644
--- a/crates/ra_analysis/src/lib.rs
+++ b/crates/ra_analysis/src/lib.rs
@@ -217,6 +217,9 @@ impl Analysis {
         self.imp
             .approximately_resolve_symbol(file_id, offset, token)
     }
+    pub fn find_all_refs(&self, file_id: FileId, offset: TextUnit, token: &JobToken) -> Vec<(FileId, TextRange)> {
+        self.imp.find_all_refs(file_id, offset, token)
+    }
     pub fn parent_module(&self, file_id: FileId) -> Vec<(FileId, FileSymbol)> {
         self.imp.parent_module(file_id)
     }