mirror of https://github.com/node-red/node-red.git
93 lines
3.7 KiB
JavaScript
93 lines
3.7 KiB
JavaScript
/**
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* Copyright 2013 IBM Corp.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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**/
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module.exports = function(RED) {
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"use strict";
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function ChangeNode(n) {
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RED.nodes.createNode(this, n);
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this.action = n.action;
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this.property = n.property || "";
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this.from = n.from || "";
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this.to = n.to || "";
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this.reg = (n.reg === null || n.reg);
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if (this.reg === false) {
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this.from = this.from.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&");
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}
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var valid = true;
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if (this.action === "change") {
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try {
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this.re = new RegExp(this.from, "g");
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} catch (e) {
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valid = false;
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this.error("Invalid 'from' property: "+e.message);
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}
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}
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if (valid) {
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var node = this;
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this.on('input', function(msg) {
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var propertyParts;
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var depth = 0;
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propertyParts = node.property.split(".");
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try {
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propertyParts.reduce(function(obj, i) {
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var to = node.to;
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// Set msg from property to another msg property
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if (node.action === "replace" && node.to.indexOf("msg.") === 0) {
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var parts = to.substring(4);
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var msgPropParts = parts.split(".");
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try {
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msgPropParts.reduce(function(ob, j) {
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to = (typeof ob[j] !== "undefined" ? ob[j] : undefined);
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return to;
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}, msg);
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} catch (err) {}
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}
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if (++depth === propertyParts.length) {
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if (node.action === "change") {
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if (typeof obj[i] === "string") {
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obj[i] = obj[i].replace(node.re, node.to);
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}
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} else if (node.action === "replace") {
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if (typeof to === "undefined") {
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delete(obj[i]);
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} else {
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obj[i] = to;
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}
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} else if (node.action === "delete") {
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delete(obj[i]);
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}
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} else {
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// to property doesn't exist, don't create empty object
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if (typeof to === "undefined") {
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return;
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// setting a non-existent multilevel object, create empty parent
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} else if (!obj[i]) {
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obj[i] = {};
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}
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return obj[i];
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}
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}, msg);
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} catch (err) {}
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node.send(msg);
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});
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}
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}
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RED.nodes.registerType("change", ChangeNode);
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};
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