ActionScriptでISO8601をDateに変換してみた

ちゃんとテストしてない。ていうか、ほとんどテストしてない。そのうえ作る時に考えてない。

parseIso8601

private static const ISO8601_RE:RegExp
    = /^(\d{4})(-?(((\d{2})(-?(\d{2}))?)|(\d{3})|(W(\d{2})-?(\d)))([T ](\d{2})(:?(\d{2})(:?(\d{2})([,\.](\d+))?)?)?(Z|(([+-])(\d{2})(:?(\d{2}))?))?)?)?$/;
public static function parseIso8601(s:String):Date
{
    var year:int = 1970;
    var month:int = 0;
    var date:int = 1;
    var hour:int = 0;
    var minute:int = 0;
    var second:int = 0;
    var millisec:int = 0;
    var offset:int = 0;
    var m:Array = s.match(ISO8601_RE);
    if(!m) return null;
    if(m[1]) year = int(m[1]);
    if(m[3]) date = int(m[3]);
    if(m[5]) month = int(m[5]) - 1;
    if(m[7]) date = int(m[7]);
    if(m[10] && m[11]){
        var first:Date = new Date(year, 0, 1);
        var w:int = (first.day == 0 ? 6 : first.day - 1);
        date = 8 - w + (int(m[11]) - 1) + 7 * (int(m[10]) - 2);
    }
    if(m[13]) hour = int(m[13]) % 24;
    if(m[15]) minute = int(m[15]);
    if(m[17]) second = int(m[17]);
    if(m[19]) millisec = int(m[19]);
    if(m[20] && m[20] == 'Z')
        return new Date(Date.UTC(year, month, date, hour, minute, second, millisec));

    if(m[23]) offset = int(m[23]) * 60;
    if(m[25]) offset += int(m[25]);
    if(m[22] && m[22] == '-') offset = -offset;

     offset *= 60 * 1000;
    return new Date(Date.UTC(year, month, date, hour, minute, second, millisec) - offset);
}