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var moment = require('moment');
var Parser = require('../parser').Parser;
var ParsedResult = require('../../result').ParsedResult;
var util = require('../../utils/EN');
var PATTERN = new RegExp('' +
'(\\W|^)' +
'(?:within\\s*)?' +
'(' + util.TIME_UNIT_PATTERN + ')' +
'(?:ago|before|earlier)(?=(?:\\W|$))', 'i');
var STRICT_PATTERN = new RegExp('' +
'(\\W|^)' +
'(?:within\\s*)?' +
'(' + util.TIME_UNIT_STRICT_PATTERN + ')' +
'ago(?=(?:\\W|$))', 'i');
exports.Parser = function ENTimeAgoFormatParser(){
Parser.apply(this, arguments);
this.pattern = function() {
return this.isStrictMode()? STRICT_PATTERN : PATTERN;
};
this.extract = function(text, ref, match, opt){
if (match.index > 0 && text[match.index-1].match(/\w/)) return null;
var text = match[0];
text = match[0].substr(match[1].length, match[0].length - match[1].length);
var index = match.index + match[1].length;
var result = new ParsedResult({
index: index,
text: text,
ref: ref
});
var fragments = util.extractDateTimeUnitFragments(match[2]);
var date = moment(ref);
for (var key in fragments) {
date.add(-fragments[key], key);
}
if (fragments['hour'] > 0 || fragments['minute'] > 0 || fragments['second'] > 0) {
result.start.assign('hour', date.hour());
result.start.assign('minute', date.minute());
result.start.assign('second', date.second());
result.tags['ENTimeAgoFormatParser'] = true;
}
if (fragments['d'] > 0 || fragments['month'] > 0 || fragments['year'] > 0) {
result.start.assign('day', date.date());
result.start.assign('month', date.month() + 1);
result.start.assign('year', date.year());
} else {
if (fragments['week'] > 0) {
result.start.imply('weekday', date.day());
}
result.start.imply('day', date.date());
result.start.imply('month', date.month() + 1);
result.start.imply('year', date.year());
}
return result;
};
}
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