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/*
*/
var moment = require('moment');
var Parser = require('../parser').Parser;
var ParsedResult = require('../../result').ParsedResult;
var DAYS_OFFSET = { 'sunday': 0, 'sun': 0, 'monday': 1, 'mon': 1,'tuesday': 2, 'tues':2, 'tue':2, 'wednesday': 3, 'wed': 3,
'thursday': 4, 'thurs':4, 'thur': 4, 'thu': 4,'friday': 5, 'fri': 5,'saturday': 6, 'sat': 6};
var PATTERN = new RegExp('(\\W|^)' +
'(?:(?:\\,|\\(|\\（)\\s*)?' +
'(?:on\\s*?)?' +
'(?:(this|last|past|next)\\s*)?' +
'(' + Object.keys(DAYS_OFFSET).join('|') + ')' +
'(?:\\s*(?:\\,|\\)|\\）))?' +
'(?:\\s*(this|last|past|next)\\s*week)?' +
'(?=\\W|$)', 'i');
var PREFIX_GROUP = 2;
var WEEKDAY_GROUP = 3;
var POSTFIX_GROUP = 4;
exports.updateParsedComponent = function updateParsedComponent(result, ref, offset, modifier) {
var startMoment = moment(ref);
var startMomentFixed = false;
var refOffset = startMoment.day();
if(modifier == 'last' || modifier == 'past') {
startMoment.day(offset - 7);
startMomentFixed = true;
} else if(modifier == 'next') {
startMoment.day(offset + 7);
startMomentFixed = true;
} else if(modifier == 'this') {
startMoment.day(offset);
} else {
if (Math.abs(offset - 7 - refOffset) < Math.abs(offset - refOffset)) {
startMoment.day(offset - 7);
} else if (Math.abs(offset + 7 - refOffset) < Math.abs(offset - refOffset)) {
startMoment.day(offset + 7);
} else {
startMoment.day(offset);
}
}
result.start.assign('weekday', offset);
if (startMomentFixed) {
result.start.assign('day', startMoment.date());
result.start.assign('month', startMoment.month() + 1);
result.start.assign('year', startMoment.year());
} else {
result.start.imply('day', startMoment.date());
result.start.imply('month', startMoment.month() + 1);
result.start.imply('year', startMoment.year());
}
return result;
};
exports.Parser = function ENWeekdayParser() {
Parser.apply(this, arguments);
this.pattern = function() { return PATTERN; };
this.extract = function(text, ref, match, opt){
var index = match.index + match[1].length;
var text = match[0].substr(match[1].length, match[0].length - match[1].length);
var result = new ParsedResult({
index: index,
text: text,
ref: ref
});
var dayOfWeek = match[WEEKDAY_GROUP].toLowerCase();
var offset = DAYS_OFFSET[dayOfWeek];
if(offset === undefined) {
return null;
}
var prefix = match[PREFIX_GROUP];
var postfix = match[POSTFIX_GROUP];
var norm = prefix || postfix;
norm = norm || '';
norm = norm.toLowerCase();
exports.updateParsedComponent(result, ref, offset, norm);
result.tags['ENWeekdayParser'] = true;
return result;
}
};
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