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node-red/nodes/logic/10-switch.js

65 lines
1.9 KiB
JavaScript

/**
* 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.
**/
var RED = require("../../red/red");
var operators = {
'eq':function(a,b) { return a == b; },
'neq':function(a,b) { return a != b; },
'lt':function(a,b) { return a < b; },
'lte':function(a,b) { return a <= b; },
'gt':function(a,b) { return a > b; },
'gte':function(a,b) { return a >= b; },
'btwn':function(a,b,c) { return a >= b && a <= c; },
'cont':function(a,b) { return (a+"").indexOf(b) != -1; },
'regex': function(a,b) { return (a+"").match(new RegExp(b)); },
'true': function(a) { return a === true; },
'false': function(a) { return a === false; },
'null': function(a) { return a === null; },
'nnull': function(a) { return a !== null; }
};
function SwitchNode(n) {
RED.nodes.createNode(this,n);
this.rules = n.rules;
this.property = n.property;
var propertyParts = n.property.split(".");
var node = this;
this.on('input',function(msg) {
var onward = [];
var prop = propertyParts.reduce(function(obj,i) {
return obj[i]
},msg);
for (var i=0;i<node.rules.length;i+=1) {
var rule = node.rules[i];
if (operators[rule.t](prop,rule.v,rule.v2)) {
onward.push(msg);
} else {
onward.push(null);
}
}
this.send(onward);
});
}
RED.nodes.registerType("switch",SwitchNode);