/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Sage.
 *
 * The Initial Developer of the Original Code is
 * Peter Andrews <petea@jhu.edu>.
 * Portions created by the Initial Developer are Copyright (C) 2005
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 * Peter Andrews <petea@jhu.edu>
 * Erik Arvidsson <erik@eae.net>
 * Kurosawa Takeshi <taken.spc@gmail.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

function tXSLTProcesser() {
  this._processer = new XSLTProcessor();
  this._processer.reset();
}

tXSLTProcesser.prototype = {
  XSLTNS : 'http://www.w3.org/1999/XSL/Transform',
  output : new Array(),
  importStylesheet : function(aXML) {
    this._processer.importStylesheet(aXML);
    this.inspectXSLT(aXML);
  },
  reset : function() {
    try {
      this._processer.reset();
    } catch(e) {
      throw(e);
    }
  },
  setParameter : function(aNamespaceURI, aLocalName, aValue) {
    try {
      this._processer.setParameter(aNamespaceURI, aLocalName, aValue);
    } catch(e) {
      throw(e);
    }
  },
  getParameter : function(aNamespaceURI, aLocalName) {
    try {
      var result = this._processer.getParameter(aNamespaceURI, aLocalName);
    } catch(e) {
      throw(e);
      return;
    }
    return result;
  },
  clearParameters : function() {
    try {
      this._processer.clearParameter();
    } catch(e) {
      throw(e);
    }
  },
  transformToDocument : function(aXML) {
    try {
      var result = this._processer.transformToDocument(aXML);
    } catch(e) {
      throw (e);
      return;
    }
    switch(this.output['method'])
    {
	    case 'html':
	    	if(this.output['indent'] != 'no') this.xmlIndent(result);
	    	break;
    	case 'text':
    		result = result.childNodes.item(0).firstChild.nodeValue;
    		break;
    	case 'xml':
    	default:
	    	if(this.output['indent'] != 'no') this.xmlIndent(result);
    		if(this.output['OmitXmlDeclaration'] != 'yes') this.addXmlDec(result);
    		break;
	}
	return result;
  },

  transformToFragment : function(aXML,aDoc) {
    try {
      var result = this._processer.transformToFragment(aXML,aDoc);
    } catch(e) {
      throw(e);
      return;
    }
	return result;
  },
  
  inspectXSLT : function(aXML) {
    try {
      var outputElement = aXML.getElementsByTagNameNS(this.XSLTNS, 'output')[0];
    } catch (e){
    }

    if(outputElement) {
      this.output['method'] = outputElement.getAttribute('method');
      this.output['version'] = outputElement.getAttribute('version');
      this.output['encoding'] = outputElement.getAttribute('encoding');
      this.output['omitXmlDeclaration'] = outputElement.getAttribute('omit-xml-declaration');
      this.output['standalone'] = outputElement.getAttribute('standalone');
      this.output['doctypePublic'] = outputElement.getAttribute('doctype-public');
      this.output['doctypeSystem'] = outputElement.getAttribute('doctype-system');
      this.output['cdataSectionElements'] = outputElement.getAttribute('cdata-section-elements');
      this.output['indent'] = outputElement.getAttribute('indent');
      this.output['mediaType'] = outputElement.getAttribute('media-type');
    }
  },
  
  addXmlDec : function(aXML) {
    if(this.output['version'] == null) this.output['version'] = '1.0';
    var dec = 'version="' + this.output['version'] + '"';

    if(this.output['encoding'] != null) dec += ' encoding="' + this.output['encoding'] + '"';
    if(this.output['standalone'] != null) dec += ' standalone="' + this.output['standalone'] + '"';
    var xmlDec = aXML.createProcessingInstruction('xml', dec);

    aXML.insertBefore(xmlDec, aXML.firstChild);
  },

  xmlIndent : function (aDoc) {
  	var treeWalker = aDoc.createTreeWalker(aDoc, NodeFilter.SHOW_ELEMENT, null, true);
  	aDoc._depth = 0;
  	while(treeWalker.nextNode()) {
  		var cNode = treeWalker.currentNode;
  		var pNode = cNode.parentNode;
  		var tmpTextNode;
  
  		if(pNode) {
  			cNode._depth = pNode._depth + 1;
  			if(cNode == aDoc.documentElement) continue;
  			tmpTextNode = aDoc.createTextNode("\n" + getIndent(cNode._depth));
  			pNode.insertBefore(tmpTextNode, cNode);
  		}
  		if(!cNode.nextSibling) {
  			tmpTextNode = aDoc.createTextNode("\n" + getIndent(cNode._depth - 1));
  			pNode.appendChild(tmpTextNode);
  		}
  	}
  	function getIndent(aDepth) {
  		// in some weird case this is NaN
  		if (aDepth < 0 || isNaN(aDepth))
  			return "";
  		var result = new Array( aDepth );
  		return result.join("\t");
  	}
  }
};