3 files changed, 79 insertions, 2 deletions

diff --git a/crates/ra_syntax/src/ast.rs b/crates/ra_syntax/src/ast.rs
index 7f986d322..2a3bd27e2 100644
--- a/crates/ra_syntax/src/ast.rs
+++ b/crates/ra_syntax/src/ast.rs
@@ -482,6 +482,37 @@ impl<'a> PrefixExpr<'a> {
     }
 }
 
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
+pub enum SelfParamFlavor {
+    /// self
+    Owned,
+    /// &self
+    Ref,
+    /// &mut self
+    MutRef,
+}
+
+impl<'a> SelfParam<'a> {
+    pub fn flavor(&self) -> SelfParamFlavor {
+        let borrowed = self.syntax().children().any(|n| n.kind() == AMP);
+        if borrowed {
+            // check for a `mut` coming after the & -- `mut &self` != `&mut self`
+            if self
+                .syntax()
+                .children()
+                .skip_while(|n| n.kind() != AMP)
+                .any(|n| n.kind() == MUT_KW)
+            {
+                SelfParamFlavor::MutRef
+            } else {
+                SelfParamFlavor::Ref
+            }
+        } else {
+            SelfParamFlavor::Owned
+        }
+    }
+}
+
 #[test]
 fn test_doc_comment_of_items() {
     let file = SourceFileNode::parse(
diff --git a/crates/ra_syntax/src/ast/generated.rs b/crates/ra_syntax/src/ast/generated.rs
index 91de17ddf..7df6a9c46 100644
--- a/crates/ra_syntax/src/ast/generated.rs
+++ b/crates/ra_syntax/src/ast/generated.rs
@@ -3488,6 +3488,43 @@ impl<'a> ReturnExpr<'a> {
     }
 }
 
+// SelfKw
+#[derive(Debug, Clone, Copy,)]
+pub struct SelfKwNode<R: TreeRoot<RaTypes> = OwnedRoot> {
+    pub(crate) syntax: SyntaxNode<R>,
+}
+pub type SelfKw<'a> = SelfKwNode<RefRoot<'a>>;
+
+impl<R1: TreeRoot<RaTypes>, R2: TreeRoot<RaTypes>> PartialEq<SelfKwNode<R1>> for SelfKwNode<R2> {
+    fn eq(&self, other: &SelfKwNode<R1>) -> bool { self.syntax == other.syntax }
+}
+impl<R: TreeRoot<RaTypes>> Eq for SelfKwNode<R> {}
+impl<R: TreeRoot<RaTypes>> Hash for SelfKwNode<R> {
+    fn hash<H: Hasher>(&self, state: &mut H) { self.syntax.hash(state) }
+}
+
+impl<'a> AstNode<'a> for SelfKw<'a> {
+    fn cast(syntax: SyntaxNodeRef<'a>) -> Option<Self> {
+        match syntax.kind() {
+            SELF_KW => Some(SelfKw { syntax }),
+            _ => None,
+        }
+    }
+    fn syntax(self) -> SyntaxNodeRef<'a> { self.syntax }
+}
+
+impl<R: TreeRoot<RaTypes>> SelfKwNode<R> {
+    pub fn borrowed(&self) -> SelfKw {
+        SelfKwNode { syntax: self.syntax.borrowed() }
+    }
+    pub fn owned(&self) -> SelfKwNode {
+        SelfKwNode { syntax: self.syntax.owned() }
+    }
+}
+
+
+impl<'a> SelfKw<'a> {}
+
 // SelfParam
 #[derive(Debug, Clone, Copy,)]
 pub struct SelfParamNode<R: TreeRoot<RaTypes> = OwnedRoot> {
@@ -3523,7 +3560,15 @@ impl<R: TreeRoot<RaTypes>> SelfParamNode<R> {
 }
 
 
-impl<'a> SelfParam<'a> {}
+impl<'a> SelfParam<'a> {
+    pub fn type_ref(self) -> Option<TypeRef<'a>> {
+        super::child_opt(self)
+    }
+
+    pub fn self_kw(self) -> Option<SelfKw<'a>> {
+        super::child_opt(self)
+    }
+}
 
 // SlicePat
 #[derive(Debug, Clone, Copy,)]
diff --git a/crates/ra_syntax/src/grammar.ron b/crates/ra_syntax/src/grammar.ron
index 688a4af1e..c55e9e07a 100644
--- a/crates/ra_syntax/src/grammar.ron
+++ b/crates/ra_syntax/src/grammar.ron
@@ -534,7 +534,8 @@ Grammar(
                 ["params", "Param"]
             ]
         ),
-        "SelfParam": (),
+        "SelfParam": (options: ["TypeRef", "SelfKw"]),
+        "SelfKw": (),
         "Param": (
             options: [ "Pat", "TypeRef" ],
         ),