Add Body AST item and visit_body in visitor

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

src/syn/ast.rs

@@ -1,5 +1,29 @@
 use crate::syn::visit::*;
 
+// TODO : add locations to parsed items
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct Body {
+    pub body: Vec<Stmt>,
+}
+
+//
+// impl Accept for Body
+//
+impl<V: Visit> Accept<V> for Body {
+    fn accept(&self, visitor: &mut V) -> V::Out {
+        visitor.visit_body(self)
+    }
+}
+
+impl<V: Visit<Out=()>> DefaultAccept<V> for Body {
+    fn default_accept(&self, visitor: &mut V) -> V::Out {
+        self.body
+            .iter()
+            .for_each(|stmt| visitor.visit_stmt(stmt));
+    }
+}
+
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub enum Stmt {
     Expr(Expr),

src/syn/visit.rs

@@ -11,6 +11,7 @@ pub trait DefaultAccept<V: Visit + ?Sized> {
 pub trait Visit {
     type Out;
 
+    fn visit_body(&mut self, body: &Body) -> Self::Out;
     fn visit_stmt(&mut self, stmt: &Stmt) -> Self::Out;
     fn visit_assign_stmt(&mut self, assign: &AssignStmt) -> Self::Out;
     fn visit_lhs_expr(&mut self, lhs_expr: &LhsExpr) -> Self::Out;