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* @name xml
* @description Use these methods to generate XML and XHTML compliant tags and
* escape tag attributes correctly
* @author Bermi Ferrer - http://bermi.org
* @author David Heinemeier Hansson http://loudthinking.com
*/
WYMeditor.XmlHelper = function()
{
  this._entitiesDiv = document.createElement('div');
  return this;
};


/*
* @name tag
* @description
* Returns an empty HTML tag of type *name* which by default is XHTML
* compliant. Setting *open* to true will create an open tag compatible
* with HTML 4.0 and below. Add HTML attributes by passing an attributes
* array to *options*. For attributes with no value like (disabled and
* readonly), give it a value of true in the *options* array.
*
* Examples:
*
*   this.tag('br')
*    # => <br />
*   this.tag ('br', false, true)
*    # => <br>
*   this.tag ('input', jQuery({type:'text',disabled:true }) )
*    # => <input type="text" disabled="disabled" />
*/
WYMeditor.XmlHelper.prototype.tag = function(name, options, open)
{
  options = options || false;
  open = open || false;
  return '<'+name+(options ? this.tagOptions(options) : '')+(open ? '>' : ' />');
};

/*
* @name contentTag
* @description
* Returns a XML block tag of type *name* surrounding the *content*. Add
* XML attributes by passing an attributes array to *options*. For attributes
* with no value like (disabled and readonly), give it a value of true in
* the *options* array. You can use symbols or strings for the attribute names.
*
*   this.contentTag ('p', 'Hello world!' )
*    # => <p>Hello world!</p>
*   this.contentTag('div', this.contentTag('p', "Hello world!"), jQuery({class : "strong"}))
*    # => <div class="strong"><p>Hello world!</p></div>
*   this.contentTag("select", options, jQuery({multiple : true}))
*    # => <select multiple="multiple">...options...</select>
*/
WYMeditor.XmlHelper.prototype.contentTag = function(name, content, options)
{
  options = options || false;
  return '<'+name+(options ? this.tagOptions(options) : '')+'>'+content+'</'+name+'>';
};

/*
* @name cdataSection
* @description
* Returns a CDATA section for the given +content+.  CDATA sections
* are used to escape blocks of text containing characters which would
* otherwise be recognized as markup. CDATA sections begin with the string
* <tt>&lt;![CDATA[</tt> and } with (and may not contain) the string
* <tt>]]></tt>.
*/
WYMeditor.XmlHelper.prototype.cdataSection = function(content)
{
  return '<![CDATA['+content+']]>';
};


/*
* @name escapeOnce
* @description
* Returns the escaped +xml+ without affecting existing escaped entities.
*
*  this.escapeOnce( "1 > 2 &amp; 3")
*    # => "1 &gt; 2 &amp; 3"
*/
WYMeditor.XmlHelper.prototype.escapeOnce = function(xml)
{
  return this._fixDoubleEscape(this.escapeEntities(xml));
};

/*
* @name _fixDoubleEscape
* @description
* Fix double-escaped entities, such as &amp;amp;, &amp;#123;, etc.
*/
WYMeditor.XmlHelper.prototype._fixDoubleEscape = function(escaped)
{
  return escaped.replace(/&amp;([a-z]+|(#\d+));/ig, "&$1;");
};

/*
* @name tagOptions
* @description
* Takes an array like the one generated by Tag.parseAttributes
*  [["src", "http://www.editam.com/?a=b&c=d&amp;f=g"], ["title", "Editam, <Simplified> CMS"]]
* or an object like {src:"http://www.editam.com/?a=b&c=d&amp;f=g", title:"Editam, <Simplified> CMS"}
* and returns a string properly escaped like
* ' src = "http://www.editam.com/?a=b&amp;c=d&amp;f=g" title = "Editam, &lt;Simplified&gt; CMS"'
* which is valid for strict XHTML
*/
WYMeditor.XmlHelper.prototype.tagOptions = function(options)
{
  var xml = this;
  xml._formated_options = '';

  for (var key in options) {
    var formated_options = '';
    var value = options[key];
    if(typeof value != 'function' && value.length > 0) {

      if(parseInt(key) == key && typeof value == 'object'){
        key = value.shift();
        value = value.pop();
      }
      if(key != '' && value != ''){
        xml._formated_options += ' '+key+'="'+xml.escapeOnce(value)+'"';
      }
    }
  }
  return xml._formated_options;
};