node-nlp/examples/microsoft-bot/node_modules/chrono-node/src/refiners/OverlapRemovalRefiner.js

Library for NLU (Natural Language Understanding) done in Node.js

/*
  
*/
var Refiner = require('./refiner').Refiner;

exports.Refiner = function OverlapRemovalRefiner() {
	Refiner.call(this);
	

	this.refine = function(text, results, opt) { 

        if (results.length < 2) return results;
        
        var filteredResults = [];
        var prevResult = results[0];
        
        for (var i=1; i<results.length; i++){
            
            var result = results[i];
            
            // If overlap, compare the length and discard the shorter one
            if (result.index < prevResult.index + prevResult.text.length) {

                if (result.text.length > prevResult.text.length){
                    prevResult = result;
                }
                
            } else {
                filteredResults.push(prevResult);
                prevResult = result;
            }
        }
        
        // The last one
        if (prevResult != null) {
            filteredResults.push(prevResult);
        }

        return filteredResults;
    }
}