node-red/nodes/core/logic/15-change.js

/**
 * Copyright 2013 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.
 **/

module.exports = function(RED) {
    function ChangeNode(n) {
        RED.nodes.createNode(this, n);
        this.action = n.action;
        this.property = n.property || "";
        this.from = n.from || " ";
        this.to = n.to || " ";
        this.reg = (n.reg === null || n.reg);
        var node = this;
        if (node.reg === false) {
            this.from = this.from.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&");
        }
        var makeNew = function( stem, path, value ) {
            var lastPart = (arguments.length === 3) ? path.pop() : false;
            for (var i = 0; i < path.length; i++) {
                stem = stem[path[i]] = stem[path[i]] || {};
            }
            if (lastPart) { stem = stem[lastPart] = value; }
            return stem;
        };
    
        this.on('input', function (msg) {
            if (node.action == "change") {
                try {
                    node.re = new RegExp(this.from, "g");
                } catch (e) {
                    node.error(e.message);
                }
                if (typeof msg[node.property] === "string") {
                    msg[node.property] = (msg[node.property]).replace(node.re, node.to);
                }
            }
            //else if (node.action == "replace") {
                //if (node.to.indexOf("msg.") == 0) {
                    //msg[node.property] = eval(node.to);
                //}
                //else {
                    //msg[node.property] = node.to;
                //}
            //}
            else if (node.action == "replace") {
                if (node.to.indexOf("msg.") == 0) {
                    makeNew( msg, node.property.split("."), eval(node.to) );
                }
                else {
                    makeNew( msg, node.property.split("."), node.to );
                }
                //makeNew( msg, node.property.split("."), node.to );
            }
            else if (node.action == "delete") {
                delete(msg[node.property]);
            }
            node.send(msg);
        });
    }
    RED.nodes.registerType("change", ChangeNode);
}