TrainSignManage/WebFrame/bower_components/moment/src/lib/units/offset.js

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import zeroFill from '../utils/zero-fill';
import { createDuration } from '../duration/create';
import { addSubtract } from '../moment/add-subtract';
import { isMoment, copyConfig } from '../moment/constructor';
import { addFormatToken } from '../format/format';
import { addRegexToken, matchOffset, matchShortOffset } from '../parse/regex';
import { addParseToken } from '../parse/token';
import { createLocal } from '../create/local';
import { prepareConfig } from '../create/from-anything';
import { createUTC } from '../create/utc';
import isDate from '../utils/is-date';
import toInt from '../utils/to-int';
import isUndefined from '../utils/is-undefined';
import compareArrays from '../utils/compare-arrays';
import { hooks } from '../utils/hooks';

// FORMATTING

function offset (token, separator) {
    addFormatToken(token, 0, 0, function () {
        var offset = this.utcOffset();
        var sign = '+';
        if (offset < 0) {
            offset = -offset;
            sign = '-';
        }
        return sign + zeroFill(~~(offset / 60), 2) + separator + zeroFill(~~(offset) % 60, 2);
    });
}

offset('Z', ':');
offset('ZZ', '');

// PARSING

addRegexToken('Z',  matchShortOffset);
addRegexToken('ZZ', matchShortOffset);
addParseToken(['Z', 'ZZ'], function (input, array, config) {
    config._useUTC = true;
    config._tzm = offsetFromString(matchShortOffset, input);
});

// HELPERS

// timezone chunker
// '+10:00' > ['10',  '00']
// '-1530'  > ['-15', '30']
var chunkOffset = /([\+\-]|\d\d)/gi;

function offsetFromString(matcher, string) {
    var matches = (string || '').match(matcher);

    if (matches === null) {
        return null;
    }

    var chunk   = matches[matches.length - 1] || [];
    var parts   = (chunk + '').match(chunkOffset) || ['-', 0, 0];
    var minutes = +(parts[1] * 60) + toInt(parts[2]);