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node-red/red/runtime/util.js

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