Handwrite Stmt

crates/ra_syntax/src/ast/generated.rs

@@ -1,6 +1,37 @@
 //! This file is actually hand-written, but the submodules are indeed generated.
+#[rustfmt::skip]
+mod nodes;
+#[rustfmt::skip]
+mod tokens;
 
-#[rustfmt::skip]
-pub(super) mod nodes;
-#[rustfmt::skip]
-pub(super) mod tokens;
+use crate::{
+    AstNode,
+    SyntaxKind::{self, *},
+    SyntaxNode,
+};
+
+pub use {nodes::*, tokens::*};
+
+// Stmt is the only nested enum, so it's easier to just hand-write it
+impl AstNode for Stmt {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            LET_STMT | EXPR_STMT => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxNode) -> Option<Self> {
+        let res = match syntax.kind() {
+            LET_STMT => Stmt::LetStmt(LetStmt { syntax }),
+            EXPR_STMT => Stmt::ExprStmt(ExprStmt { syntax }),
+            _ => return None,
+        };
+        Some(res)
+    }
+    fn syntax(&self) -> &SyntaxNode {
+        match self {
+            Stmt::LetStmt(it) => &it.syntax,
+            Stmt::ExprStmt(it) => &it.syntax,
+        }
+    }
+}