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

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/**
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* Copyright 2013, 2015 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);
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this.rules = n.rules;
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if (!this.rules) {
var rule = {
t:(n.action=="replace"?"set":n.action),
p:n.property||""
}
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if (rule.t === "set") {
rule.to = n.to||"";
} else if (rule.t === "change") {
rule.from = n.from||"";
rule.to = n.to||"";
rule.re = (n.reg===null||n.reg);
}
this.rules = [rule];
}
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this.actions = [];
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var valid = true;
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for (var i=0;i<this.rules.length;i++) {
var rule = this.rules[i];
// Migrate to type-aware rules
if (!rule.pt) {
rule.pt = "msg";
}
if (rule.t === "change" && rule.re) {
rule.fromt = 're';
delete rule.re;
}
if (rule.t === "set" && !rule.tot) {
if (rule.to.indexOf("msg.") === 0 && !rule.tot) {
rule.to = rule.to.substring(4);
rule.tot = "msg";
}
}
if (!rule.tot) {
rule.tot = "str";
}
if (!rule.fromt) {
rule.fromt = "str";
}
if (rule.t === "change" && rule.fromt !== 'msg' && rule.fromt !== 'flow' && rule.fromt !== 'global') {
rule.fromRE = rule.from;
if (rule.fromt !== 're') {
rule.fromRE = rule.fromRE.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&");
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}
try {
rule.fromRE = new RegExp(rule.fromRE, "g");
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} catch (e) {
valid = false;
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this.error(RED._("change.errors.invalid-from",{error:e.message}));
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}
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}
if (rule.tot === 'num') {
rule.to = Number(rule.to);
} else if (rule.tot === 'json') {
try {
rule.to = JSON.parse(rule.to);
} catch(e2) {
valid = false;
this.error(RED._("change.errors.invalid-json"));
}
} else if (rule.tot === 'bool') {
rule.to = /^true$/i.test(rule.to);
}
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}
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function applyRule(msg,rule) {
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try {
var property = rule.p;
var value = rule.to;
var current;
var fromValue;
var fromType;
var fromRE;
if (rule.tot === "msg") {
value = RED.util.getMessageProperty(msg,rule.to);
} else if (rule.tot === 'flow') {
value = node.context().flow.get(rule.to);
} else if (rule.tot === 'global') {
value = node.context().global.get(rule.to);
}
if (rule.t === 'change') {
if (rule.fromt === 'msg' || rule.fromt === 'flow' || rule.fromt === 'global') {
if (rule.fromt === "msg") {
fromValue = RED.util.getMessageProperty(msg,rule.from);
} else if (rule.tot === 'flow') {
fromValue = node.context().flow.get(rule.from);
} else if (rule.tot === 'global') {
fromValue = node.context().global.get(rule.from);
}
if (typeof fromValue === 'number' || fromValue instanceof Number) {
fromType = 'num';
} else if (typeof fromValue === 'boolean') {
fromType = 'bool'
} else if (fromValue instanceof RegExp) {
fromType = 're';
fromRE = fromValue;
} else if (typeof fromValue === 'string') {
fromType = 'str';
fromRE = fromValue.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&");
try {
fromRE = new RegExp(fromRE, "g");
} catch (e) {
valid = false;
node.error(RED._("change.errors.invalid-from",{error:e.message}));
return
}
} else {
node.error(RED._("change.errors.invalid-from",{error:"unsupported type: "+(typeof fromValue)}));
return
}
} else {
fromType = rule.fromt;
fromValue = rule.from;
fromRE = rule.fromRE;
}
}
if (rule.pt === 'msg') {
if (rule.t === 'delete') {
RED.util.setMessageProperty(msg,property,undefined);
} else if (rule.t === 'set') {
RED.util.setMessageProperty(msg,property,value);
} else if (rule.t === 'change') {
current = RED.util.getMessageProperty(msg,property);
if (typeof current === 'string') {
if ((fromType === 'num' || fromType === 'bool') && current === fromValue) {
// str representation of exact from number/boolean
// only replace if they match exactly
RED.util.setMessageProperty(msg,property,value);
} else {
current = current.replace(fromRE,value);
RED.util.setMessageProperty(msg,property,current);
}
} else if ((typeof current === 'number' || current instanceof Number) && fromType === 'num') {
if (current == Number(fromValue)) {
RED.util.setMessageProperty(msg,property,value);
}
} else if (typeof current === 'boolean' && fromType === 'bool') {
if (current.toString() === fromValue) {
RED.util.setMessageProperty(msg,property,value);
}
}
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}
} else {
var target;
if (rule.pt === 'flow') {
target = node.context().flow;
} else if (rule.pt === 'global') {
target = node.context().global;
}
if (target) {
if (rule.t === 'delete') {
target.set(property,undefined);
} else if (rule.t === 'set') {
target.set(property,value);
} else if (rule.t === 'change') {
current = target.get(msg,property);
if (typeof current === 'string') {
if ((fromType === 'num' || fromType === 'bool') && current === fromValue) {
// str representation of exact from number/boolean
// only replace if they match exactly
target.set(property,value);
} else {
current = current.replace(fromRE,value);
target.set(property,current);
}
} else if ((typeof current === 'number' || current instanceof Number) && fromType === 'num') {
if (current == Number(fromValue)) {
target.set(property,value);
}
} else if (typeof current === 'boolean' && fromType === 'bool') {
if (current.toString() === fromValue) {
target.set(property,value);
}
}
}
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}
}
} catch(err) {/*console.log(err.stack)*/}
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return msg;
}
if (valid) {
var node = this;
this.on('input', function(msg) {
for (var i=0;i<this.rules.length;i++) {
msg = applyRule(msg,this.rules[i]);
if (msg === null) {
return;
}
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}
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node.send(msg);
});
}
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}
RED.nodes.registerType("change", ChangeNode);
};