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

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/**
* 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.
**/
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module.exports = function(RED) {
"use strict";
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function ChangeNode(n) {
RED.nodes.createNode(this, n);
this.action = n.action;
this.property = n.property || "";
this.from = n.from || "";
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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var valid = true;
if (this.action === "change") {
try {
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this.re = new RegExp(this.from, "g");
} catch (e) {
valid = false;
this.error("Invalid 'from' property: "+e.message);
}
}
if (valid) {
var node = this;
this.on('input', function(msg) {
var propertyParts;
var depth = 0;
propertyParts = node.property.split(".");
try {
propertyParts.reduce(function(obj, i) {
var to = node.to;
// Set msg from property to another msg property
if (node.action === "replace" && node.to.indexOf("msg.") === 0) {
var parts = to.substring(4);
var msgPropParts = parts.split(".");
try {
msgPropParts.reduce(function(ob, j) {
to = (typeof ob[j] !== "undefined" ? ob[j] : undefined);
return to;
}, msg);
} catch (err) {}
}
if (++depth === propertyParts.length) {
if (node.action === "change") {
if (typeof obj[i] === "string") {
obj[i] = obj[i].replace(node.re, node.to);
}
} else if (node.action === "replace") {
if (typeof to === "undefined") {
delete(obj[i]);
} else {
obj[i] = to;
}
} else if (node.action === "delete") {
delete(obj[i]);
}
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} else {
// to property doesn't exist, don't create empty object
if (typeof to === "undefined") {
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return;
// setting a non-existent multilevel object, create empty parent
} else if (!obj[i]) {
obj[i] = {};
}
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return obj[i];
}
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}, msg);
} catch (err) {}
node.send(msg);
});
}
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}
RED.nodes.registerType("change", ChangeNode);
};