From f20ea6792688b97a8d9b50e9eed783e4773d9a86 Mon Sep 17 00:00:00 2001
From: Nathan Dinsmore <nathan@users.noreply.github.com>
Date: Wed, 17 Jun 2015 21:08:12 -0400
Subject: [PATCH] Provide a fallback for browsers that don't support Map

---
 morphic.js | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/morphic.js b/morphic.js
index 5cc40628..fe2cc8b3 100644
--- a/morphic.js
+++ b/morphic.js
@@ -3077,6 +3077,40 @@ Morph.prototype.updateReferences = function (map) {
     }
 };
 
+if (typeof Map === 'undefined') {
+    // use normal objects + stringification if Map doesn't exist
+
+    Morph.prototype.fullCopy = function () {
+        var dict = {}, c;
+        c = this.copyRecordingReferences(dict);
+        c.forAllChildren(function (m) {
+            m.updateReferences(dict);
+        });
+        return c;
+    };
+
+    Morph.prototype.copyRecordingReferences = function (dict) {
+        var c = this.copy();
+        dict[this] = c;
+        this.children.forEach(function (m) {
+            c.add(m.copyRecordingReferences(dict));
+        });
+        return c;
+    };
+
+    Morph.prototype.updateReferences = function (dict) {
+        var property, value, reference;
+        for (var properties = Object.keys(this), l = properties.length, i = 0; i < l; ++i) {
+            property = properties[i];
+            value = this[property];
+            if (value && value.isMorph) {
+                reference = dict[value];
+                if (reference) this[property] = reference;
+            }
+        }
+    };
+}
+
 // Morph dragging and dropping:
 
 Morph.prototype.rootForGrab = function () {