node-nlp/examples/microsoft-bot/node_modules/chrono-node/src/parsers/JP/JPStandardParser.js

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

/*
    
    
*/

var moment = require('moment');

var Parser = require('../parser').Parser;
var ParsedResult = require('../../result').ParsedResult;

var util  = require('../../utils/JP'); 
var PATTERN = /(?:(同|((昭和|平成)?([0-9０-９]{2,4})))年\s*)?([0-9０-９]{1,2})月\s*([0-9０-９]{1,2})日/i;
  
var YEAR_GROUP        = 2;
var ERA_GROUP         = 3;
var YEAR_NUMBER_GROUP = 4;
var MONTH_GROUP       = 5;
var DAY_GROUP         = 6;

exports.Parser = function JPStandardParser(){
    Parser.apply(this, arguments);
    
    this.pattern = function() { return PATTERN; }
    
    this.extract = function(text, ref, match, opt){ 

        var startMoment = moment(ref);
        var result = new ParsedResult({
            text: match[0],
            index: match.index,
            ref: ref,
        });
        
        var month = match[MONTH_GROUP];
        month = util.toHankaku(month);
        month = parseInt(month);

        var day = match[DAY_GROUP];
        day = util.toHankaku(day);
        day = parseInt(day);

        startMoment.set('date', day);
        startMoment.set('month', month - 1);
        result.start.assign('day', startMoment.date());
        result.start.assign('month', startMoment.month() + 1);
            
        if (!match[YEAR_GROUP]) {
            
            //Find the most appropriated year
            startMoment.year(moment(ref).year());
            var nextYear = startMoment.clone().add(1, 'y');
            var lastYear = startMoment.clone().add(-1, 'y');
            if( Math.abs(nextYear.diff(moment(ref))) < Math.abs(startMoment.diff(moment(ref))) ){  
                startMoment = nextYear;
            }
            else if( Math.abs(lastYear.diff(moment(ref))) < Math.abs(startMoment.diff(moment(ref))) ){ 
                startMoment = lastYear;
            }

            result.start.assign('day', startMoment.date());
            result.start.assign('month', startMoment.month() + 1);
            result.start.imply('year', startMoment.year());

        } else if (match[YEAR_GROUP].match('同年')) {

            result.start.assign('year', startMoment.year());

        } else {
            var year = match[YEAR_NUMBER_GROUP];
            year = util.toHankaku(year);
            year = parseInt(year);

            if (match[ERA_GROUP] == '平成') {
                year += 1988;
            } else if (match[ERA_GROUP] == '昭和') {
                year += 1925;
            }

            result.start.assign('year', year);
        }
        

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

}