/* minisax.js -- Minimum SAX in JavaScript 
 * by M.Hiyama (hiyama{at}chimaira{dot}org) 2005
 * URL: http://www.chimaira.org/
 */

/*
 * Attributes
 */

function Attributes(attrs) {
 // attrs:[Attr*]
 this._attrs = attrs;
}

Attributes.prototype.toString = function() {
 var attrs = this._attrs;
 var s = "";
 for (var i = 0; i < attrs.length; i++) {
   if (i !== 0) s += " ";
   s += attrs[i].toString();
 }
 return s;
};

/* getQName */
Attributes.prototype.getQName = function(index) {
 if (index < 0 || this._attrs.length <= index) {
  return null;
 }
 return this._attrs[index].name;
};

/* getValueFromIndex */
Attributes.prototype.getValueFromIndex = function(index) {
 if (index < 0 || this._attrs.length <= index) {
  return null;
 }
 return this._attrs[index].value;
};

/* getValueFromQName */
Attributes.prototype.getValueFromQName = function(qname) {
 // return:string
 var attrs = this._attrs;
 for (var i = 0; i < attrs.length; i++) {
  if (attrs[i].name == qname) return attrs[i].value;
 }
 return null;
};

/* getValue (index or qname) */
Attributes.prototype.getValue = function(key) {
 if (typeof key == 'number') {
  return this.getValueFromIndex(key);
 } else if (typeof key == 'string') {
  return this.getValueFromQName(key);
 } else {
  return null;
 }
};

/* getIndexFromQName */
Attributes.prototype.getIndexFromQName = function(qname) {
 var attrs = this._attrs;
 for (var i = 0; i < attrs.length; i++) {
  if (attrs[i].name == qname) return i;
 }
 return -1;
};

/*
 * DOMReader 
 */

function DOMReader() {
 this.contentHandler = null;
}

DOMReader.prototype.toString = function() {
 return "[object DOMReader]";
};

DOMReader.prototype.parseNode = function(node) {
 // return:void
 if (!this.contentHandler) {
  return;
 }
 var handler = this.contentHandler;
 
 if (handler.startParsing) {
  handler.startParsing();
 }
 this._parseNode(node);
 if (handler.endParsing) {
  handler.endParsing();
 }
};
 
DOMReader.prototype._parseNode = function(node) {
 var handler = this.contentHandler;
 switch(node.nodeType) {
  case 1: // element
   if (handler.startElement) {
    var attrs = new Attributes(node.attributes);
    handler.startElement(node.tagName, attrs);
   }
   var children = node.childNodes;
   for (var i = 0; i < children.length; i++) {
    this._parseNode(children[i]);
   }
   if (handler.endElement) {
    handler.endElement(node.tagName);
   }
   break;
  case 3: // text
   if (handler.characters) {
    handler.characters(node.data);
   }
   break;
  case 9: // document
   if (handler.startDocument) {
    handler.startDocument();
   }
   var children = node.childNodes;
   for (var i = 0; i < children.length; i++) {
    this._parseNode(children[i]);
   }
   if (handler.endDocument) {
    handler.endDocument();
   }
   break;
  case 11: // document fragment
   if (handler.startDocumentFragment) {
    handler.startDocumentFragment();
   }
   var children = node.childNodes;
   for (var i = 0; i < children.length; i++) {
    this._parseNode(children[i]);
   }
   if (handler.endDocumentFragment) {
    handler.endDocumentFragment();
   }
   break;
  default:
   ; // do nothing
   break;
 }
};