node-nlp
Version:
Library for NLU (Natural Language Understanding) done in Node.js
71 lines (49 loc) • 2.04 kB
JavaScript
/*
*/
var moment = require('moment');
var Parser = require('../parser').Parser;
var ParsedResult = require('../../result').ParsedResult;
var PATTERN = /(\W|^)(now|today|tonight|last\s*night|(?:tomorrow|tmr|yesterday)\s*|tomorrow|tmr|yesterday)(?=\W|$)/i;
exports.Parser = function ENCasualDateParser(){
Parser.apply(this, arguments);
this.pattern = function() { return PATTERN; }
this.extract = function(text, ref, match, opt){
var text = match[0].substr(match[1].length);
var index = match.index + match[1].length;
var result = new ParsedResult({
index: index,
text: text,
ref: ref,
});
var refMoment = moment(ref);
var startMoment = refMoment.clone();
var lowerText = text.toLowerCase();
if(lowerText == 'tonight'){
// Normally means this coming midnight
result.start.imply('hour', 22);
result.start.imply('meridiem', 1);
} else if (/^tomorrow|^tmr/.test(lowerText)) {
// Check not "Tomorrow" on late night
if(refMoment.hour() > 1) {
startMoment.add(1, 'day');
}
} else if (/^yesterday/.test(lowerText)) {
startMoment.add(-1, 'day');
} else if(lowerText.match(/last\s*night/)) {
result.start.imply('hour', 0);
if (refMoment.hour() > 6) {
startMoment.add(-1, 'day');
}
} else if (lowerText.match("now")) {
result.start.assign('hour', refMoment.hour());
result.start.assign('minute', refMoment.minute());
result.start.assign('second', refMoment.second());
result.start.assign('millisecond', refMoment.millisecond());
}
result.start.assign('day', startMoment.date())
result.start.assign('month', startMoment.month() + 1)
result.start.assign('year', startMoment.year())
result.tags['ENCasualDateParser'] = true;
return result;
}
}