// script.aculo.us builder.js v1.6.4, Wed Sep 06 11:30:58 CEST 2006

// Copyright (c) 2005 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)

//

// See scriptaculous.js for full license.

var Builder = {

  NODEMAP: {

    AREA: 'map',

    CAPTION: 'table',

    COL: 'table',

    COLGROUP: 'table',

    LEGEND: 'fieldset',

    OPTGROUP: 'select',

    OPTION: 'select',

    PARAM: 'object',

    TBODY: 'table',

    TD: 'table',

    TFOOT: 'table',

    TH: 'table',

    THEAD: 'table',

    TR: 'table'

  },

  // note: For Firefox < 1.5, OPTION and OPTGROUP tags are currently broken,

  //       due to a Firefox bug

  node: function(elementName) {

    elementName = elementName.toUpperCase();

    // try innerHTML approach

    var parentTag = this.NODEMAP[elementName] || 'div';

    var parentElement = document.createElement(parentTag);

    try { // prevent IE "feature": http://dev.rubyonrails.org/ticket/2707

      parentElement.innerHTML = "<" + elementName + "></" + elementName + ">";

    } catch(e) {}

    var element = parentElement.firstChild || null;

    // see if browser added wrapping tags

    if(element && (element.tagName != elementName))

      element = element.getElementsByTagName(elementName)[0];

    // fallback to createElement approach

    if(!element) element = document.createElement(elementName);

    // abort if nothing could be created

    if(!element) return;

    // attributes (or text)

    if(arguments[1])

      if(this._isStringOrNumber(arguments[1]) ||

        (arguments[1] instanceof Array)) {

          this._children(element, arguments[1]);

        } else {

          var attrs = this._attributes(arguments[1]);

          if(attrs.length) {

            try { // prevent IE "feature": http://dev.rubyonrails.org/ticket/2707

              parentElement.innerHTML = "<" +elementName + " " +

                attrs + "></" + elementName + ">";

            } catch(e) {}

            element = parentElement.firstChild || null;

            // workaround firefox 1.0.X bug

            if(!element) {

              element = document.createElement(elementName);

              for(attr in arguments[1]) 

                element[attr == 'class' ? 'className' : attr] = arguments[1][attr];

            }

            if(element.tagName != elementName)

              element = parentElement.getElementsByTagName(elementName)[0];

            }

        } 

    // text, or array of children

    if(arguments[2])

      this._children(element, arguments[2]);

     return element;

  },

  _text: function(text) {

     return document.createTextNode(text);

  },

  _attributes: function(attributes) {

    var attrs = [];

    for(attribute in attributes)

      attrs.push((attribute=='className' ? 'class' : attribute) +

          '="' + attributes[attribute].toString().escapeHTML() + '"');

    return attrs.join(" ");

  },

  _children: function(element, children) {

    if(typeof children=='object') { // array can hold nodes and text

      children.flatten().each( function(e) {

        if(typeof e=='object')

          element.appendChild(e)

        else

          if(Builder._isStringOrNumber(e))

            element.appendChild(Builder._text(e));

      });

    } else

      if(Builder._isStringOrNumber(children)) 

         element.appendChild(Builder._text(children));

  },

  _isStringOrNumber: function(param) {

    return(typeof param=='string' || typeof param=='number');

  },

  dump: function(scope) { 

    if(typeof scope != 'object' && typeof scope != 'function') scope = window; //global scope 

    var tags = ("A ABBR ACRONYM ADDRESS APPLET AREA B BASE BASEFONT BDO BIG BLOCKQUOTE BODY " +

      "BR BUTTON CAPTION CENTER CITE CODE COL COLGROUP DD DEL DFN DIR DIV DL DT EM FIELDSET " +

      "FONT FORM FRAME FRAMESET H1 H2 H3 H4 H5 H6 HEAD HR HTML I IFRAME IMG INPUT INS ISINDEX "+

      "KBD LABEL LEGEND LI LINK MAP MENU META NOFRAMES NOSCRIPT OBJECT OL OPTGROUP OPTION P "+

      "PARAM PRE Q S SAMP SCRIPT SELECT SMALL SPAN STRIKE STRONG STYLE SUB SUP TABLE TBODY TD "+

      "TEXTAREA TFOOT TH THEAD TITLE TR TT U UL VAR").split(/\s+/);

    tags.each( function(tag){ 

      scope[tag] = function() { 

        return Builder.node.apply(Builder, [tag].concat($A(arguments)));  

      } 

    });

  }

}