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Detect Doctype (DTD)

Test all different doctypes (DTD).

See source for the example code and below for correct code.

This is a revisioned version of the previous one. The new one is faster and takes less space.

test

// Detects Doctype (DTD);
// syntax:	detectDoctype();
// return:	[Boolean and Object]	boolean if exist and object doctype with specified info;
//			doctype.registration	[String or null or false]	string if excist, null if not found, false if not excist;
//			doctype.organization	[String or null or false]	string if excist, null if not found, false if not excist;
//			doctype.label			[String or Array or null or false]	string if excist, array if multiple, null if not found, false if not excist;
//			doctype.label.host		[String or Array or null or false]	string if excist, array if multiple, null if not found, false if not excist;
//			doctype.label.version	[String or Array or null or false]	string if excist, array if multiple, null if not found, false if not excist;
//			doctype.label.type		[String or Array or null or false]	string if excist, array if multiple, null if not found, false if not excist;
//			doctype.language		[String or null or false]	string if excist, null if not found, false if not excist;
var detectDoctype=function(){
	var regDTD   = /\s*(.*)\/\/\s*(\w*)\/\/\s*(\w*)\s+(.*)\s*\/\/\s*(\w*)\s*/gi;
	var regLabel = /(\w*)\s+([a-zA-Z]*)\s*([\d\.]*)\s*(\w*)/gi;
	window.doctype={};
	 doctype.registration=null;
	 doctype.organization=null;
	 doctype.type=null;
	 doctype.label=[null];
	  doctype.label.host=null;
	  doctype.label.version=null;
	  doctype.label.type=null;
	 doctype.language=null;
	if(document.doctype){
		identifier=document.doctype.publicId;
	}
	else {
		return false;
	}
	if(typeof(identifier)=="string" && identifier.match(regDTD)){
		doctype.registration=RegExp.$1?RegExp.$1:null;
		doctype.organization=RegExp.$2?RegExp.$2:null;
		doctype.type=RegExp.$3?RegExp.$3:null;
		doctype.label=RegExp.$4?RegExp.$4:null;
		doctype.language=RegExp.$5?RegExp.$5:null;
		if(labels=doctype.label.split(/\s*plus\s*/)){
			doctype.label=labels;
			doctype.label.host=[];
			doctype.label.version=[];
			doctype.label.type=[];
			for(var i=0; i<labels.length; i++){
				labels[i].match(regLabel);
				doctype.label.host.push(RegExp.$1?RegExp.$1:null);
				doctype.label.version.push(RegExp.$3?RegExp.$3:null);
				if(RegExp.$2){
					doctype.label.type.push(RegExp.$2?RegExp.$2:null);
				}
				else{
					doctype.label.type.push(RegExp.$4?RegExp.$4:null);
		}	}	}
		return true;
	}
	else{
		doctype.registration=false;
		doctype.organization=false;
		doctype.type=false;
		doctype.label=[false];
		 doctype.label.host=false;
		 doctype.label.version=false;
		 doctype.label.type=false;
		doctype.language=false;
		return false;
	}
};