Implement Find All References for local variables

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();

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)
     }

crates/ra_analysis/tests/tests.rs

@@ -10,6 +10,8 @@ use std::sync::Arc;
 use ra_analysis::{
     Analysis, AnalysisHost, CrateGraph, CrateId, FileId, FileResolver, FnDescriptor, JobHandle,
 };
+use ra_syntax::TextRange;
+
 use relative_path::{RelativePath, RelativePathBuf};
 use rustc_hash::FxHashMap;
 use test_utils::{assert_eq_dbg, extract_offset};
@@ -225,3 +227,43 @@ fn bar() {
     assert_eq!(desc.ret_type, None);
     assert_eq!(param, Some(1));
 }
+
+fn get_all_refs(text: &str) -> Vec<(FileId, TextRange)> {
+    let (offset, code) = extract_offset(text);
+    let code = code.as_str();
+
+    let (_handle, token) = JobHandle::new();
+    let snap = analysis(&[("/lib.rs", code)]);
+
+    snap.find_all_refs(FileId(1), offset, &token)
+}
+
+#[test]
+fn test_find_all_refs_for_local() {
+    let code = r#"
+    fn main() {
+        let mut i = 1;
+        let j = 1;
+        i = i<|> + j;
+
+        {
+            i = 0;
+        }
+
+        i = 5;
+    }"#;
+
+    let refs = get_all_refs(code);
+    assert_eq!(refs.len(), 5);
+}
+
+#[test]
+fn test_find_all_refs_for_param_inside() {
+    let code = r#"
+    fn foo(i : u32) -> u32 {
+        i<|>
+    }"#;
+
+    let refs = get_all_refs(code);
+    assert_eq!(refs.len(), 2);
+}

crates/ra_editor/src/scope/fn_scope.rs

@@ -270,7 +270,6 @@ pub fn resolve_local_name<'a>(
         .filter(|entry| shadowed.insert(entry.name()))
         .filter(|entry| entry.name() == name_ref.text())
         .nth(0);
-    eprintln!("ret = {:?}", ret);
     ret
 }
 

crates/ra_lsp_server/src/caps.rs

@@ -27,7 +27,7 @@ pub fn server_capabilities() -> ServerCapabilities {
         definition_provider: Some(true),
         type_definition_provider: None,
         implementation_provider: None,
-        references_provider: None,
+        references_provider: Some(true),
         document_highlight_provider: None,
         document_symbol_provider: Some(true),
         workspace_symbol_provider: Some(true),

crates/ra_lsp_server/src/main_loop/handlers.rs

@@ -460,6 +460,22 @@ pub fn handle_signature_help(
     }
 }
 
+pub fn handle_references(
+    world: ServerWorld,
+    params: req::ReferenceParams,
+    token: JobToken,
+) -> Result<Option<Vec<Location>>> {
+    let file_id = params.text_document.try_conv_with(&world)?;
+    let line_index = world.analysis().file_line_index(file_id);
+    let offset = params.position.conv_with(&line_index);
+
+    let refs = world.analysis().find_all_refs(file_id, offset, &token);
+
+    Ok(Some(refs.into_iter()
+        .filter_map(|r| to_location(r.0, r.1, &world, &line_index).ok())
+        .collect()))
+}
+
 pub fn handle_code_action(
     world: ServerWorld,
     params: req::CodeActionParams,

crates/ra_lsp_server/src/main_loop/mod.rs

@@ -248,6 +248,7 @@ fn on_request(
         .on::<req::CodeActionRequest>(handlers::handle_code_action)?
         .on::<req::FoldingRangeRequest>(handlers::handle_folding_range)?
         .on::<req::SignatureHelpRequest>(handlers::handle_signature_help)?
+        .on::<req::References>(handlers::handle_references)?
         .finish();
     match req {
         Ok((id, handle)) => {

crates/ra_lsp_server/src/req.rs

@@ -7,7 +7,7 @@ pub use languageserver_types::{
     CompletionResponse, DocumentOnTypeFormattingParams, DocumentSymbolParams,
     DocumentSymbolResponse, ExecuteCommandParams, Hover, InitializeResult,
     PublishDiagnosticsParams, SignatureHelp, TextDocumentEdit, TextDocumentPositionParams,
-    TextEdit, WorkspaceSymbolParams,
+    TextEdit, WorkspaceSymbolParams, ReferenceParams,
 };
 
 pub enum SyntaxTree {}