Add parser function nodes for XML, JSON and CSV.

Each is dual function - pass in (for example) and get out a js object, pass in a js object and get back out the xml string.
The CSV node must be configured with a column template that specifys the required property names for that column (csv->js), or the properties of the object that should be made into the csv (js->csv)

nodes/core/parsers/70-JSON.js

@@ -0,0 +1,44 @@
+/**
+ * Copyright 2014 IBM Corp.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ **/
+
+var RED = require(process.env.NODE_RED_HOME+"/red/red");
+var util = require("util");
+
+function JSONNode(n) {
+    RED.nodes.createNode(this,n);
+    var node = this;
+    this.on("input", function(msg) {
+        if (msg.hasOwnProperty("payload")) {
+            if (typeof msg.payload === "string") {
+                try {
+                    msg.payload = JSON.parse(msg.payload);
+                    node.send(msg);
+                }
+                catch(e) { node.log(e+ "\n"+msg.payload); }
+            }
+            else if (typeof msg.payload === "object") {
+                if (!Buffer.isBuffer(msg.payload) ) {
+                    if (!util.isArray(msg.payload)) {
+                        msg.payload = JSON.stringify(msg.payload);
+                        node.send(msg);
+                    }
+                }
+            }
+            else { node.log("dropped: "+msg.payload); }
+        }
+    });
+}
+RED.nodes.registerType("json",JSONNode);