root/trunk/as2/com/jeroenwijering/feeds/AbstractParser.as @ 1

/**
* General functionality of all feedtype-parsers.
*
* @author       Jeroen Wijering
* @version      1.3
**/


import com.jeroenwijering.utils.StringMagic;


class com.jeroenwijering.feeds.AbstractParser {


        /** All elements that can be parsed without manipulations **/
        private var elements:Object;
        /** Accepted mimetypes for enclosures **/
        private var mimetypes:Object;
        /** Timezone abbreviation offsets **/
        private var timezones:Object = { IDLW:-12,NT:-11,AHST:-10,CAT:-10,HST:-10,
                YST:-9,PST:-8,MST:-7,PDT:-7,CST:-6,EST:-5,CDT:-5,EDT:-4,ADT:-3,WBT:-4,
                AST:-4,NT:-3.5,EBT:-3,AT:-2,WAT:-1,UTC:0,UT:0,GMT:0,WET:0,CET:1,
                CEST:1,EET:2,EEDT:3,MSK:3,IRT:3.5,SAMT:4,YEKT:5,TMT:5,TJT:5,OMST:6,
                NOVT:6,LKT:6,MMT:6.5,KRAT:7,ICT:7,WIT:7,WAST:7,IRKT:8,ULAT:8,CST:8,
                CIT:8,BNT:8,YAKT:9,JST:9,KST:9,EIT:9,ACST:9.5,VLAT:10,ACDT:10.5,
                SAKT:10,GST:10,MAGT:11,IDLE:12,PETT:12,NZST:12
        };      
        /** Supporting array to translate RFC2822 months to number. **/
        private var MONTH_INDEXES:Object = {January:0,February:1,March:2,April:3,
                May:4,June:5,July:6,August:7,September:8,October:9,November:10,
                December:11,Jan:0,Feb:1,Mar:2,Apr:3,May:4,Jun:5,Jul:6,Aug:7,Sep:8,
                Oct:9,Nov:10,Dec:11};


        /** Constructor. **/
        function AbstractParser(pre:String) {
                setElements();
                setMimes();
        };


        /** build an array with all regular elements **/
        private function setElements() {
                elements = new Object();
        };


        /** build an array with all registered mimetypes **/
        private function setMimes() {
                mimetypes = new Object();
                mimetypes["mp3"] = "mp3";
                mimetypes["audio/mpeg"] = "mp3";
                mimetypes["flv"] = "flv";
                mimetypes["video/x-flv"] = "flv";
                mimetypes["jpeg"] = "jpg";
                mimetypes["jpg"] = "jpg";
                mimetypes["image/jpeg"] = "jpg";
                mimetypes["png"] = "png";
                mimetypes["image/png"] = "png";
                mimetypes["gif"] = "gif";
                mimetypes["image/gif"] = "gif";
                mimetypes["rtmp"] = "rtmp";
                mimetypes["swf"] = "swf";
                mimetypes["mov"] = "mov";
                mimetypes["application/x-shockwave-flash"] = "swf";
                mimetypes["rtmp"] = "rtmp";
                mimetypes["application/x-fcs"] = "rtmp";
                mimetypes["audio/x-m4a"] = "m4a";
                mimetypes["audio/x-mp4"] = "mp4";
                mimetypes["video/x-m4v"] = "m4v";
                mimetypes["video/mp4"] = "mp4";
                mimetypes["video/h264"] = "mp4";
                mimetypes["video/3gpp"] = "3gp";
                mimetypes["video/x-3gpp2"] = "3g2";
                mimetypes["audio/x-3gpp2"] = "3g2";
        };


        /** Parse a specific object. **/
        function parse(xml:XML):Array {
                var arr:Array = new Array();
                for(var i=0; i<xml.firstChild.childNodes.length; i++) {
                        arr.push(xml.firstChild.childNodes[i].nodeName);
                }
                return arr;
        };


        /** Translate RFC2822 date strings to timestamp. **/
        private function rfc2Date(dat:String):Number {
                if(isNaN(dat)) {
                        var darr:Array = dat.split(' ');
                        darr[1] == "" ? darr.splice(1,1) : null;
                        var month:Number = MONTH_INDEXES[darr[2]];
                        var date:Number = darr[1].substring(0,2);
                        var year:Number = darr[3];
                        var zone = darr[5];
                        var tarr = darr[4].split(':');
                        var myDate = new Date(year,month,date,tarr[0],tarr[1],tarr[2]);
                        var stamp = Math.round(myDate.valueOf()/1000) - 
                                myDate.getTimezoneOffset()*60;
                        if(isNaN(zone)) { 
                                stamp -= 3600*timezones[zone]; 
                        } else { 
                                stamp -= 3600*Number(zone.substring(0,3)) - 
                                        60*Number(zone.substring(3,2));
                        }
                        return stamp;
                } else {
                        return Number(dat);
                }
        };


        /** Translate ISO8601 date strings to timestamp. **/
        private function iso2Date(dat):Number {
                if(isNaN(dat)) {
                        while(dat.indexOf(" ") > -1) {
                                var idx = dat.indexOf(" ");
                                dat = dat.substr(0,idx) + dat.substr(idx+1);
                        }
                        var myDate = new Date(dat.substr(0,4),dat.substr(5,2)-1,
                                dat.substr(8,2),dat.substr(11,2),dat.substr(14,2),
                                dat.substr(17,2));
                        var stamp = Math.round(myDate.valueOf()/1000) - 
                                myDate.getTimezoneOffset()*60;
                        if(dat.length > 20) { 
                                var hr:Number = Number(dat.substr(20,2));
                                var mn:Number = Number(dat.substr(23,2));
                                if(dat.charAt(19) == "-") {
                                        stamp = stamp - hr*3600 - mn*60;
                                } else {
                                        stamp += hr*3600 + mn*60;
                                }
                        }
                        return stamp;
                } else {
                        return dat;
                }
        };


}