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/*
  Copyright (c) 2003 Jan-Klaas Kollhof
  
  This file is part of the JavaScript o lait library(jsolait).
  
  jsolait is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.
 
  This software is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU Lesser General Public License for more details.
 
  You should have received a copy of the GNU Lesser General Public License
  along with this software; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/


/**
   Provides parseXML and an importNode implementation.
*/
Module("xml","1.1.2", function(mod){
    /**
        Thrown if no parser could be instanciated.
    */
    mod.NoXMLParser=Class("NoXMLParser", mod.Exception, function(publ, supr){
        /**
            Initializes the Exception.
            @param trace  The error causing the Exception.
        */
        publ.init=function(trace){
            supr(this).init("Could not create an XML parser.", trace);
        }
    })
    /**
        Thrown if a document could not be parsed.
    */
    mod.ParsingFailed=Class("ParsingFailed", mod.Exception, function(publ, supr){
        /**
            Initializes the Exception.
            @param xml    The xml source which could not be parsed.
            @param trace The error causing this Exception.
        */
        publ.init=function(xml,trace){
             supr(this).init("Failed parsing XML document.",trace);
            this.xml = xml;
        }
        ///The xml source which could not be parsed.
        publ.xml;
    })
    /**
        Parses an xml document.
        @param xml     The xml text.
        @return          A DOM of the xml document.
    */
    mod.parseXML=function(xml){
        var obj=null;
        var isMoz=false;
        var isIE=false;
        var isASV=false;
        
        try{//to get Adobe's SVG parseXML
            var p=window.parseXML;
            if(p==null){
                throw "No ASV paseXML";
            }
            isASV=true;
        }catch(e){
            try{//to get the mozilla parser
                obj = new DOMParser();
                isMoz=true;
            }catch(e){
                try{//to get the MS XML parser
                    obj = new ActiveXObject("Msxml2.DomDocument.4.0"); 
                    isIE=true;
                }catch(e){
                    try{//to get the MS XML parser
                        obj = new ActiveXObject("Msxml2.DomDocument"); 
                        isIE=true;
                    }catch(e){
                        try{//to get the old MS XML parser
                            obj = new ActiveXObject("microsoft.XMLDOM"); 
                            isIE=true;
                        }catch(e){
                            throw new mod.NoXMLParser(e);
                        }
                    }
                }
            }
        }
        try{
            if(isMoz){
                obj = obj.parseFromString(xml, "text/xml");
                return obj;
            }else if(isIE){
                obj.loadXML(xml);
                return obj;
            }else if(isASV){
                return window.parseXML(xml, null);
            }
        }catch(e){
            throw new mod.ParsingFailed(xml,e);
        }
    }
    /**
        DOM2 implimentation of document.importNode().
        This will import into the current document. In SVG it will create SVG nodes in HTML it will create HTML nodes....
        This might become customizable in the future.
        @param importedNode   The node to import.
        @param deep=true        Import all childNodes recursively.
        @return                      The imported Node.
    */
    mod.importNode=function(importedNode, deep){
        deep = (deep==null) ? true : deep;
        //constants from doom2
        var ELEMENT_NODE = 1;
        var ATTRIBUTE_NODE = 2;
        var TEXT_NODE = 3;
        var CDATA_SECTION_NODE = 4;
        var ENTITY_REFERENCE_NODE = 5;
        var ENTITY_NODE = 6;
        var PROCESSING_INSTRUCTION_NODE = 7;
        var COMMENT_NODE = 8;
        var DOCUMENT_NODE = 9;
        var DOCUMENT_TYPE_NODE = 10;
        var DOCUMENT_FRAGMENT_NODE = 11;
        var NOTATION_NODE = 12;
        var importChildren=function(srcNode, parent){
            if(deep){
                 for(var i=0; i<srcNode.childNodes.length; i++){
                    var n=mod.importNode(srcNode.childNodes.item(i), true);
                    parent.appendChild(n);
                }
            }
        }
        var node=null;
        switch(importedNode.nodeType){
            case ATTRIBUTE_NODE:
                node=document.createAttributeNS(importedNode.namespaceURI, importedNode.nodeName);
                node.value=importedNode.value;
                break;
            case DOCUMENT_FRAGMENT_NODE:
                node=document.createDocumentFragment();
                importChildren(importedNode,node);
                break;
            case ELEMENT_NODE:
                node=document.createElementNS(importedNode.namespaceURI, importedNode.tagName);
                //import all attributes
                for(var i=0; i<importedNode.attributes.length; i++){
                    var attr=this.importNode(importedNode.attributes.item(i), deep);
                    node.setAttributeNodeNS(attr);
                }
                importChildren(importedNode,node);
                break;
            case ENTITY_REFERENCE_NODE:
                node=importedNode;
                break;
            case PROCESSING_INSTRUCTION_NODE:
                node=document.createProcessingInstruction(importedNode.target, importedNode.data);
                break;
            case TEXT_NODE:
            case CDATA_SECTION_NODE:
            case COMMENT_NODE:
                node=document.createTextNode(importedNode.nodeValue);
                break;
            case DOCUMENT_NODE:
                //Document nodes cannot be imported.
            case DOCUMENT_TYPE_NODE:
                //DocumentType nodes cannot be imported.
            case NOTATION_NODE:
                //readonly in DOM2
            case ENTITY_NODE:
                //readonly in DOM2
                throw "not supported in DOM2";
                break;
        }
        return node;
    }
    /**
        Turns an XML document into a String.
        @param node   The node to print.
        @return           A string containing the text for the XML.
    */
    mod.node2XML = function(node){
        var ELEMENT_NODE = 1;
        var ATTRIBUTE_NODE = 2;
        var TEXT_NODE = 3;
        var CDATA_SECTION_NODE = 4;
        var ENTITY_REFERENCE_NODE = 5;
        var ENTITY_NODE = 6;
        var PROCESSING_INSTRUCTION_NODE = 7;
        var COMMENT_NODE = 8;
        var DOCUMENT_NODE = 9;
        var DOCUMENT_TYPE_NODE = 10;
        var DOCUMENT_FRAGMENT_NODE = 11;
        var NOTATION_NODE = 12;
        var s="";
        switch(node.nodeType){
            case ATTRIBUTE_NODE:
                s+=node.nodeName+'="' + node.value + '"';
                break;
            case DOCUMENT_NODE:
                s+=this.node2XML(node.documentElement);
                break;
            case ELEMENT_NODE:
                s+="<" + node.tagName;
                //attributes
                for(var i=0; i<node.attributes.length; i++){
                    s+=" " + this.node2XML(node.attributes.item(i));
                }
                //children
                if(node.childNodes.length==0){
                    s+="/>\n";
                }else{
                    s+=">";
                    for(var i=0; i<node.childNodes.length; i++){
                        s+=this.node2XML(node.childNodes.item(i));
                    }
                    s+="</" + node.tagName+ ">\n";
                }
                break;
            case PROCESSING_INSTRUCTION_NODE:
                s+="<?" + node.target + " " + node.data + " ?>";
                break;
            case TEXT_NODE:
                s+=node.nodeValue;
                break;
            case CDATA_SECTION_NODE:
                s+="<" +"![CDATA[" + node.nodeValue + "]" + "]>";
                break;
            case COMMENT_NODE:
                s+="<!--" + node.nodeValue + "-->";
                break;
            case ENTITY_REFERENCE_NODE:
            case DOCUMENT_FRAGMENT_NODE:
            case DOCUMENT_TYPE_NODE:
            case NOTATION_NODE:
            case ENTITY_NODE:
                throw new mod.Exception("Nodetype(%s) not supported.".format(node.nodeType));
                break;
        }
        return s;
    }
})