node-nlp/examples/microsoft-bot/node_modules/chrono-node/src/parsers/EN/ENSlashMonthFormatParser.js

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

/*
    Month/Year date format with slash "/" (also "-" and ".") between numbers 
    - 11/05
    - 06/2005
*/
var moment = require('moment');
var Parser = require('../parser').Parser;
var ParsedResult = require('../../result').ParsedResult;

var PATTERN = new RegExp('(^|[^\\d/]\\s+|[^\\w\\s])' +
    '([0-9]|0[1-9]|1[012])/([0-9]{4})' + 
    '([^\\d/]|$)', 'i');

var OPENNING_GROUP = 1;
var ENDING_GROUP = 4;

var MONTH_GROUP = 2;
var YEAR_GROUP = 3;

exports.Parser = function ENSlashMonthFormatParser(argument) {
    Parser.apply(this, arguments);

    this.pattern = function () { return PATTERN; };
    this.extract = function(text, ref, match, opt){
        
        var index = match.index + match[OPENNING_GROUP].length;
        var text = match[0].substr(match[OPENNING_GROUP].length, match[0].length - (1 + match[ENDING_GROUP].length)).trim();

        var result = new ParsedResult({
            text: text,
            index: index,
            ref: ref,
        });

        var date = null;
        var year = match[YEAR_GROUP] ;
        var month = match[MONTH_GROUP];
        var day   = 1;
        
        month = parseInt(month);
        year = parseInt(year);

        result.start.imply('day', day);
        result.start.assign('month', month);
        result.start.assign('year', year);

        result.tags['ENSlashMonthFormatParser'] = true;
        return result;
    };
};