Add property validate to Change node rule set

Closes #2911

packages/node_modules/@node-red/nodes/core/function/15-change.html

@@ -18,12 +18,43 @@
 </script>
 
 <script type="text/javascript">
+(function() {
+    function validateProperty(v,vt) {
+        if (/msg|flow|global/.test(vt)) {
+            if (!RED.utils.validatePropertyExpression(v)) {
+                return false;
+            }
+        } else if (v[i].vt === "jsonata") {
+            try{jsonata(v);}catch(e){return false;}
+        } else if ([i].vt === "json") {
+            try{JSON.parse(v);}catch(e){return false;}
+        }
+    }
     RED.nodes.registerType('change', {
         color: "#E2D96E",
         category: 'function',
         defaults: {
             name: {value:""},
-            rules:{value:[{t:"set",p:"payload",pt:"msg",to:"",tot:"str"}]},
+            rules:{value:[{t:"set",p:"payload",pt:"msg",to:"",tot:"str"}],validate: function(rules) {
+                if (!rules || rules.length === 0) { return true }
+                for (var i=0;i<rules.length;i++) {
+                    var r = rules[i];
+                    if (r.t === 'set') {
+                        if (!validateProperty(r.p,r.pt) || !validateProperty(r.to,r.tot)) {
+                            return false;
+                        }
+                    } else if (r.t === 'change') {
+                        if (!validateProperty(r.p,r.pt) || !validateProperty(r.from,r.fromt) || !validateProperty(r.to,r.tot)) {
+                            return false;
+                        }
+                    } else if (r.t === 'move') {
+                        if (!validateProperty(r.p,r.pt)) {
+                            return false;
+                        }
+                    }
+                }
+                return true;
+            }},
             // legacy
             action: {value:""},
             property: {value:""},
@@ -323,4 +354,5 @@
             $("#node-input-rule-container").editableList('height',height);
         }
     });
+})();
 </script>