mirror of
https://github.com/node-red/node-red.git
synced 2023-10-10 13:36:53 +02:00
182 lines
4.6 KiB
JavaScript
182 lines
4.6 KiB
JavaScript
/**
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* Copyright 2014, 2015 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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var clone = require("clone");
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function generateId() {
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return (1+Math.random()*4294967295).toString(16);
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}
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function ensureString(o) {
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if (Buffer.isBuffer(o)) {
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return o.toString();
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} else if (typeof o === "object") {
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return JSON.stringify(o);
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} else if (typeof o === "string") {
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return o;
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}
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return ""+o;
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}
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function ensureBuffer(o) {
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if (Buffer.isBuffer(o)) {
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return o;
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} else if (typeof o === "object") {
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o = JSON.stringify(o);
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} else if (typeof o !== "string") {
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o = ""+o;
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}
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return new Buffer(o);
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}
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function cloneMessage(msg) {
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// Temporary fix for #97
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// TODO: remove this http-node-specific fix somehow
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var req = msg.req;
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var res = msg.res;
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delete msg.req;
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delete msg.res;
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var m = clone(msg);
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if (req) {
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m.req = req;
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msg.req = req;
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}
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if (res) {
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m.res = res;
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msg.res = res;
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}
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return m;
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}
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function compareObjects(obj1,obj2) {
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if (obj1 === obj2) {
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return true;
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}
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if (obj1 == null || obj2 == null) {
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return false;
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}
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if (!(obj1 instanceof Object) && !(obj2 instanceof Object)) {
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return false;
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}
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var isArray1 = Array.isArray(obj1);
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var isArray2 = Array.isArray(obj2);
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if (isArray1 != isArray2) {
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return false;
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}
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if (isArray1 && isArray2) {
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if (obj1.length != obj2.length) {
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return false;
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}
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for (var i=0;i<obj1.length;i++) {
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if (!compareObjects(obj1[i],obj2[i])) {
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return false;
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}
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}
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return true;
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}
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var keys1 = Object.keys(obj1);
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var keys2 = Object.keys(obj2);
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if (keys1.length != keys2.length) {
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return false;
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}
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for (var k in obj1) {
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/* istanbul ignore else */
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if (obj1.hasOwnProperty(k)) {
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if (!compareObjects(obj1[k],obj2[k])) {
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return false;
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}
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}
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}
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return true;
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}
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function getMessageProperty(msg,expr) {
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var result = null;
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if (expr.indexOf('msg.')===0) {
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expr = expr.substring(4);
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}
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var msgPropParts = expr.split(".");
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msgPropParts.reduce(function(obj, i) {
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result = (typeof obj[i] !== "undefined" ? obj[i] : undefined);
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return result;
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}, msg);
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return result;
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}
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function setMessageProperty(msg,prop,value,createMissing) {
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if (typeof createMissing === 'undefined') {
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createMissing = (typeof value !== 'undefined');
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}
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if (prop.indexOf('msg.')===0) {
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prop = prop.substring(4);
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}
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var msgPropParts = prop.split(".");
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var depth = 0;
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msgPropParts.reduce(function(obj, i) {
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if (obj === null) {
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return null;
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}
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depth++;
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if (depth === msgPropParts.length) {
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if (typeof value === "undefined") {
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delete obj[i];
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} else {
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obj[i] = value;
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}
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} else {
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if (!obj[i]) {
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if (createMissing) {
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obj[i] = {};
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} else {
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return null;
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}
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}
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return obj[i];
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}
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}, msg);
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}
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function evaluateNodeProperty(value, type, node, msg) {
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if (type === 'str') {
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return ""+value;
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} else if (type === 'num') {
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return Number(value);
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} else if (type === 'json') {
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return JSON.parse(value);
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} else if (type === 're') {
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return new RegExp(value);
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} else if (type === 'msg' && msg) {
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return getMessageProperty(msg,value);
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} else if (type === 'flow' && node) {
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return node.context().flow.get(value);
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} else if (type === 'global' && node) {
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return node.context().global.get(value);
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}
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return value;
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}
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module.exports = {
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ensureString: ensureString,
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ensureBuffer: ensureBuffer,
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cloneMessage: cloneMessage,
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compareObjects: compareObjects,
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generateId: generateId,
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getMessageProperty: getMessageProperty,
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setMessageProperty: setMessageProperty,
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evaluateNodeProperty: evaluateNodeProperty
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};
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