96 rindas
2.4 KiB
JavaScript
96 rindas
2.4 KiB
JavaScript
// Licensed under the MIT license, see LICENSE file.
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// Author: Per Malmberg (https://github.com/PerMalmberg)
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module.exports = function(RED) {
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function BooleanLogic(config) {
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RED.nodes.createNode(this,config);
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this.config = config;
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this.state = {};
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var node = this;
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var NodeHelper = require('./NodeHelper.js');
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var h = new NodeHelper( node );
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this.on('input', function(msg) {
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var topic = msg.topic;
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var payload = msg.payload;
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if( topic !== undefined && payload !== undefined ) {
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var value = h.ToBoolean( payload );
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var state = node.state;
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state[topic] = value;
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// Do we have as many inputs as we expect?
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var keyCount = Object.keys(state).length;
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if( keyCount == node.config.inputCount ) {
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var res = CalculateResult();
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h.SetResult( res, node.config.topic );
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}
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else if(keyCount > node.config.inputCount ) {
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node.warn(
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(node.config.name !== undefined && node.config.name.length > 0
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? node.config.name : "BooleanLogic")
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+ " [" + node.config.operation + "]: More than the specified "
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+ node.config.inputCount + " topics received, resetting. Will not output new value until " + node.config.inputCount + " new topics have been received.");
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node.state = {};
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h.DisplayUnkownStatus();
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}
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}
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});
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function CalculateResult() {
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var res;
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if( node.config.operation == "XOR") {
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res = PerformXOR();
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}
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else {
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// We need a starting value to perform AND and OR operations.
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var keys = Object.keys(node.state);
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res = node.state[keys[0]];
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for( var i = 1; i < keys.length; ++i ) {
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var key = keys[i];
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res = PerformSimpleOperation( node.config.operation, res, node.state[key] );
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}
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}
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return res;
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}
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function PerformXOR()
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{
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// XOR = exclusively one input is true. As such, we just count the number of true values and compare to 1.
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var trueCount = 0;
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for( var key in node.state ) {
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if( node.state[key] ) {
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trueCount++;
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}
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}
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return trueCount == 1;
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}
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function PerformSimpleOperation( operation, val1, val2 ) {
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var res;
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if( operation === "AND" ) {
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res = val1 && val2;
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}
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else if( operation === "OR" ) {
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res = val1 || val2;
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}
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else {
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node.error( "Unknown operation: " + operation );
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}
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return res;
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}
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h.DisplayUnkownStatus();
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}
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RED.nodes.registerType("BooleanLogic",BooleanLogic);
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} |