From 3746689e9ddea455d10a41d9fc3af33b22a3707d Mon Sep 17 00:00:00 2001
From: "Jeremy A. Kolb" <jkolb@ara.com>
Date: Thu, 18 Oct 2018 13:40:12 -0400
Subject: Implement Find All References for local variables

---
 crates/ra_analysis/src/imp.rs     | 32 +++++++++++++++++++++++++++++
 crates/ra_analysis/src/lib.rs     |  3 +++
 crates/ra_analysis/tests/tests.rs | 42 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 77 insertions(+)

(limited to 'crates/ra_analysis')

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)
     }
diff --git a/crates/ra_analysis/tests/tests.rs b/crates/ra_analysis/tests/tests.rs
index e0c637d65..0c2c69ea0 100644
--- a/crates/ra_analysis/tests/tests.rs
+++ b/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);
+}
\ No newline at end of file
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