[jruby-joni] 138/194: introduce RootNode to enable more consistent ast node swapping

[Hideki Yamane]

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henrich pushed a commit to branch debian/sid
in repository jruby-joni.

commit a665c0b00dac22eb8c4c2fff90f28e33e76e7aa3
Author: Marcin Mielzynski <lopx at gazeta.pl>
Date:   Wed Jan 10 22:03:03 2018 +0100

    introduce RootNode to enable more consistent ast node swapping
---
 src/org/joni/ast/Node.java | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/src/org/joni/ast/Node.java b/src/org/joni/ast/Node.java
index 1d727f5..7ff61ff 100644
--- a/src/org/joni/ast/Node.java
+++ b/src/org/joni/ast/Node.java
@@ -98,4 +98,43 @@ public abstract class Node implements NodeType {
     public final boolean isSimple() {
         return (getType2Bit() & SIMPLE) != 0;
     }
+
+    public static RootNode newRoot(Node root) {
+        return new RootNode(root);
+    }
+
+    public static final class RootNode extends Node {
+        private Node root;
+
+        RootNode(Node root) {
+            super(-1);
+            root.parent = this;
+            setChild(root);
+        }
+
+        public Node getRoot() {
+            return root;
+        }
+
+        @Override
+        public void setChild(Node node) {
+            node.parent = this;
+            root = node;
+        }
+
+        @Override
+        public Node getChild() {
+            return root;
+        }
+
+        @Override
+        public String getName() {
+            return "ROOT";
+        }
+
+        @Override
+        public String toString(int level) {
+            return "\n" + pad(root, level + 1);
+        }
+    }
 }

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