/*==============================================================================

                             HTML2XHTML Converter 1.0
                             ========================
                       Copyright (c) 2004 Vyacheslav Smolin


Author:
-------
Vyacheslav Smolin (http://www.richarea.com, http://html2xhtml.richarea.com,
re@richarea.com)

About the script:
-----------------
HTML2XHTML Converter (H2X) generates a well formed XHTML string from a HTML DOM
object.

Requirements:
-------------
H2X works in  MS IE 5.0 for Windows or above,  in Netscape 7.1,  Mozilla 1.3 or
above. It should work in all Mozilla based browsers.

Usage:
------
Please see description of function get_xhtml below.

Demo:
-----
http://html2xhtml.richarea.com/, http://www.richarea.com/demo/

License:
--------
Free for non-commercial using. Please contact author for commercial licenses.


==============================================================================*/


//add \n before opening tag
var need_nl_before = '|div|p|table|tbody|tr|td|th|title|head|body|script|comment|li|meta|h1|h2|h3|h4|h5|h6|hr|ul|ol|option|';
//add \n after opening tag
var need_nl_after = '|html|head|body|p|th|style|';

var re_comment = new RegExp();
re_comment.compile("^<!--(.*)-->$");

var re_hyphen = new RegExp();
re_hyphen.compile("-$");


var lv_EscNam = new Array(
	"quot",
	"amp",
	"lt",
	"gt", 
	"nbsp",
	"copy",
	"Agrave",
	"Aacute",
	"Acirc",
	"Atilde",
	"Auml",
	"Aring",
	"AElig",
	"Ccedil",
	"Egrave",
	"Eacute",
	"Ecirc",
	"Euml",
	"Igrave",
	"Iacute",
	"Icirc",
	"Iuml",
	"ETH",
	"Ntilde",
	"Ograve",
	"Oacute",
	"Ocirc",
	"Otilde",
	"Ouml",
	"Oslash",
	"Ugrave",
	"Uacute",
	"Ucirc",
	"Uuml",
	"Yacute",
	"THORN",
	"szlig",
	"agrave",
	"aacute",
	"acirc",
	"atilde",
	"auml",
	"aring",
	"aelig",
	"ccedil",
	"egrave",
	"eacute",
	"ecirc",
	"euml",
	"igrave",
	"iacute",
	"icirc",
	"iuml",
	"eth",
	"ntilde",
	"ograve",
	"oacute",
	"ocirc",
	"otilde",
	"ouml",
	"oslash",
	"ugrave",
	"uacute",
	"ucirc",
	"uuml",
	"yacute",
	"thorn",
	"yuml",
	"euro"
);

var lv_EscCod = new Array(
	34,
	38,
	60,
	62, 
	160,
	169,
	192,
	193,
	194,
	195,
	196,
	197,
	198,
	199,
	200,
	201,
	202,
	203,
	204,
	205,
	206,
	207,
	208,
	209,
	210,
	211,
	212,
	213,
	214,
	216,
	217,
	218,
	219,
	220,
	221,
	222,
	223,
	224,
	225,
	226,
	227,
	228,
	229,
	230,
	231,
	232,
	233,
	234,
	235,
	236,
	237,
	238,
	239,
	240,
	241,
	242,
	243,
	244,
	245,
	246,
	248,
	249,
	250,
	251,
	252,
	253,
	254,
	255,
	8364
);

// Convert inner text of node to xhtml
// Call: get_xhtml(node);
//       get_xhtml(node, lang, encoding) -- to convert whole page
// other parameters are for inner usage and should be omitted
// Parameters:
// node - dom node to convert
// lang - document lang (need it if whole page converted)
// encoding - document charset (need it if whole page converted)
// need_nl - if true, add \n before a tag if it is in list need_nl_before
// inside_pre - if true, do not change content, as it is inside a <pre>
function get_xhtml(node, lang, encoding, need_nl, inside_pre) {
	var i;
	var text = '';
	var children = node.childNodes;
	var child_length = children.length;
	var tag_name;
	var do_nl = need_nl ? true : false;
	var page_mode = true;
	
	for (i = 0; i < child_length; i++) {
		var child = children[i];
		
		switch (child.nodeType) {
			case 1: { //ELEMENT_NODE
				var tag_name = String(child.tagName).toLowerCase();
				
				if (tag_name.indexOf("/") == 0) break;
				
				if (tag_name == '') break;
				
				if (tag_name == 'meta') {
					var meta_name = String(child.name).toLowerCase();
					if (meta_name == 'generator') break;
				}
				
				if (!need_nl && tag_name == 'body') { //html fragment mode
					page_mode = false;
				}
				
				if (tag_name == '!') { //COMMENT_NODE in IE 5.0/5.5
					//get comment inner text
					var parts = re_comment.exec(child.text);
					
					if (parts) {
						//the last char of the comment text must not be a hyphen
						var inner_text = parts[1];
						text += fix_comment(inner_text);
					}
				} else {
					if (tag_name == 'html') {
						text = '<?xml version="1.0" encoding="'+encoding+'"?>\n<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">\n';
					}
					
					/*
					//inset \n to make code more neat
					if (need_nl_before.indexOf('|'+tag_name+'|') != -1) {
						if ((do_nl || text != '') && !inside_pre) text += '\n';
					} else {
						do_nl = true;
					}
					*/
					
					text += '<'+tag_name;
					
					//add attributes
					var attr = child.attributes;
					var attr_length = attr.length;
					var attr_value;
					
					var attr_lang = false;
					var attr_xml_lang = false;
					var attr_xmlns = false;
					
					var is_alt_attr = false;
					
					for (j = 0; j < attr_length; j++) {
						var attr_name = attr[j].nodeName.toLowerCase();
						
						if (!attr[j].specified && 
							(attr_name != 'selected' || !child.selected) && 
							(attr_name != 'style' || child.style.cssText == '') && 
							attr_name != 'value') continue; //IE 5.0
						
						if (attr_name == '_moz_dirty' || 
							attr_name == '_moz_resizing' || 
							tag_name == 'br' && 
							attr_name == 'type' && 
							child.getAttribute('type') == '_moz') continue;
						
						var valid_attr = true;
						
						switch (attr_name) {
							case "style":
								attr_value = child.style.cssText;
								break;
							case "class":
								attr_value = child.className;
								break;
							case "http-equiv":
								attr_value = child.httpEquiv;
								break;
							case "noshade": break; //this set of choices will extend
							case "checked": break;
							case "selected": break;
							case "multiple": break;
							case "nowrap": break;
							case "disabled": break;
								attr_value = attr_name;
								break;
							default:
								try {
									attr_value = child.getAttribute(attr_name, 2);
								} catch (e) {
									valid_attr = false;
								}
								break;
						}
						
						//html tag attribs
						if (attr_name == 'lang') {
							attr_lang = true;
							attr_value = lang;
						}
						if (attr_name == 'xml:lang') {
							attr_xml_lang = true;
							attr_value = lang;
						}
						if (attr_name == 'xmlns') attr_xmlns = true;
						if (valid_attr) {
							//value attribute set to "0" is not handled correctly in Mozilla
							if (!(tag_name == 'li' && attr_name == 'value')) {
								text += ' '+attr_name+'="'+fix_attribute(attr_value)+'"';
							}
						}
						
						if (attr_name == 'alt') is_alt_attr = true;
					}
					
					if (tag_name == 'img' && !is_alt_attr) {
						text += ' alt=""';
					}
					
					if (tag_name == 'html') {
						if (!attr_lang) text += ' lang="'+lang+'"';
						if (!attr_xml_lang) text += ' xml:lang="'+lang+'"';
						if (!attr_xmlns) text += ' xmlns="http://www.w3.org/1999/xhtml"';
					}
					
					if (child.canHaveChildren || child.hasChildNodes()){
						text += '>';
//						if (need_nl_after.indexOf('|'+tag_name+'|') != -1) {
//							text += '\n';
//						}
						text += get_xhtml(child, lang, encoding, true, inside_pre || tag_name == 'pre' ? true : false);
						text += '</'+tag_name+'>';
					} else {
						if (tag_name == 'style' || tag_name == 'title' || tag_name == 'script') {
							text += '>';
							var inner_text;
							if (tag_name == 'script') {
								inner_text = child.text;
							} else {
								inner_text = child.innerHTML;
							}
							
							if (tag_name == 'style') {
								inner_text = String(inner_text).replace(/[\n]+/g,'\n');
							}
							
							text += inner_text+'</'+tag_name+'>';
						} else {
							text += ' />';
						}
					}
				}
				break;
			}
			case 3: { //TEXT_NODE
				if (!inside_pre) { //do not change text inside <pre> tag
					if (child.nodeValue != '\n') {
						text += fix_text(child.nodeValue);
					}
				} else {
					text += child.nodeValue;
				}
				break;
			}
			case 8: { //COMMENT_NODE
				text += fix_comment(child.nodeValue);
				break;
			}
			default:
				break;
		}
	}
	
	if (!need_nl && !page_mode) { //delete head and body tags from html fragment
		text = text.replace(/<\/?head>[\n]*/gi, "");
		text = text.replace(/<head \/>[\n]*/gi, "");
		text = text.replace(/<\/?body>[\n]*/gi, "");
	}
		
	return text;
}

//fix inner text of a comment
function fix_comment(text) {
	//delete double hyphens from the comment text
	text = text.replace(/--/g, "__");
	
	if(re_hyphen.exec(text)) { //last char must not be a hyphen
		text += " ";
	}
	
	return "<!--"+text+"-->";
}

//fix content of a text node
function fix_text(text) {
	//convert <,> and & to the corresponding entities
	return String(text).replace(/\n{2,}/g, "\n").replace(/\&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;").replace(/\u00A0/g, "&nbsp;");
}

//fix content of attributes href, src or background
function fix_attribute(text) {
	//convert <,>, & and " to the corresponding entities
	return String(text).replace(/\&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;").replace(/\"/g, "&quot;");
}

//fix content of attributes href, src or background
function get_validXhtml(node, lang, encoding, need_nl, inside_pre) {
	var text = get_xhtml(node, lang, encoding, need_nl, inside_pre);
	return text;
	var s = "";
	//alert(text)
	for (var i = 160; i < 256; i++) {
		text = text.replace(new RegExp("\\x" + ("00" + (i).toString(16)).slice(-2), "gim"), "%26#" + ("000" + i).slice(-3) + ";");
		s += "\\x" + ("00" + (i).toString(16)).slice(-2) + "-->" + "&#" + ("000" + i).slice(-3) + ";"
	}
	//alert(s);
	for (var i = 0; i < lv_EscNam.length; i++) {
		text = text.replace(new RegExp("&" + lv_EscNam[i] + ";", "gim"), "#" + ("000" + lv_EscCod[i]).slice(-3) + ";");
	}
	//alert(text)
	return text;
}