/**

*/ ;(function(window, document) { /*jshint evil:true */

/** version */
var version = '3.7.0';

/** Preset options */
var options = window.html5 || {};

/** Used to skip problem elements */
var reSkip = /^<|^(?:button|map|select|textarea|object|iframe|option|optgroup)$/i;

/** Not all elements can be cloned in IE **/
var saveClones = /^(?:a|b|code|div|fieldset|h1|h2|h3|h4|h5|h6|i|label|li|ol|p|q|span|strong|style|table|tbody|td|th|tr|ul)$/i;

/** Detect whether the browser supports default html5 styles */
var supportsHtml5Styles;

/** Name of the expando, to work with multiple documents or to re-shiv one document */
var expando = '_html5shiv';

/** The id for the the documents expando */
var expanID = 0;

/** Cached data for each document */
var expandoData = {};

/** Detect whether the browser supports unknown elements */
var supportsUnknownElements;

(function() {
  try {
      var a = document.createElement('a');
      a.innerHTML = '<xyz></xyz>';
      //if the hidden property is implemented we can assume, that the browser supports basic HTML5 Styles
      supportsHtml5Styles = ('hidden' in a);

      supportsUnknownElements = a.childNodes.length == 1 || (function() {
        // assign a false positive if unable to shiv
        (document.createElement)('a');
        var frag = document.createDocumentFragment();
        return (
          typeof frag.cloneNode == 'undefined' ||
          typeof frag.createDocumentFragment == 'undefined' ||
          typeof frag.createElement == 'undefined'
        );
      }());
  } catch(e) {
    // assign a false positive if detection fails => unable to shiv
    supportsHtml5Styles = true;
    supportsUnknownElements = true;
  }

}());

/*--------------------------------------------------------------------------*/

/**
 * Creates a style sheet with the given CSS text and adds it to the document.
 * @private
 * @param {Document} ownerDocument The document.
 * @param {String} cssText The CSS text.
 * @returns {StyleSheet} The style element.
 */
function addStyleSheet(ownerDocument, cssText) {
  var p = ownerDocument.createElement('p'),
      parent = ownerDocument.getElementsByTagName('head')[0] || ownerDocument.documentElement;

  p.innerHTML = 'x<style>' + cssText + '</style>';
  return parent.insertBefore(p.lastChild, parent.firstChild);
}

/**
 * Returns the value of `html5.elements` as an array.
 * @private
 * @returns {Array} An array of shived element node names.
 */
function getElements() {
  var elements = html5.elements;
  return typeof elements == 'string' ? elements.split(' ') : elements;
}

  /**
 * Returns the data associated to the given document
 * @private
 * @param {Document} ownerDocument The document.
 * @returns {Object} An object of data.
 */
function getExpandoData(ownerDocument) {
  var data = expandoData[ownerDocument[expando]];
  if (!data) {
      data = {};
      expanID++;
      ownerDocument[expando] = expanID;
      expandoData[expanID] = data;
  }
  return data;
}

/**
 * returns a shived element for the given nodeName and document
 * @memberOf html5
 * @param {String} nodeName name of the element
 * @param {Document} ownerDocument The context document.
 * @returns {Object} The shived element.
 */
function createElement(nodeName, ownerDocument, data){
  if (!ownerDocument) {
      ownerDocument = document;
  }
  if(supportsUnknownElements){
      return ownerDocument.createElement(nodeName);
  }
  if (!data) {
      data = getExpandoData(ownerDocument);
  }
  var node;

  if (data.cache[nodeName]) {
      node = data.cache[nodeName].cloneNode();
  } else if (saveClones.test(nodeName)) {
      node = (data.cache[nodeName] = data.createElem(nodeName)).cloneNode();
  } else {
      node = data.createElem(nodeName);
  }

  // Avoid adding some elements to fragments in IE < 9 because
  // * Attributes like `name` or `type` cannot be set/changed once an element
  //   is inserted into a document/fragment
  // * Link elements with `src` attributes that are inaccessible, as with
  //   a 403 response, will cause the tab/window to crash
  // * Script elements appended to fragments will execute when their `src`
  //   or `text` property is set
  return node.canHaveChildren && !reSkip.test(nodeName) ? data.frag.appendChild(node) : node;
}

/**
 * returns a shived DocumentFragment for the given document
 * @memberOf html5
 * @param {Document} ownerDocument The context document.
 * @returns {Object} The shived DocumentFragment.
 */
function createDocumentFragment(ownerDocument, data){
  if (!ownerDocument) {
      ownerDocument = document;
  }
  if(supportsUnknownElements){
      return ownerDocument.createDocumentFragment();
  }
  data = data || getExpandoData(ownerDocument);
  var clone = data.frag.cloneNode(),
      i = 0,
      elems = getElements(),
      l = elems.length;
  for(;i<l;i++){
      clone.createElement(elems[i]);
  }
  return clone;
}

/**
 * Shivs the `createElement` and `createDocumentFragment` methods of the document.
 * @private
 * @param {Document|DocumentFragment} ownerDocument The document.
 * @param {Object} data of the document.
 */
function shivMethods(ownerDocument, data) {
  if (!data.cache) {
      data.cache = {};
      data.createElem = ownerDocument.createElement;
      data.createFrag = ownerDocument.createDocumentFragment;
      data.frag = data.createFrag();
  }

  ownerDocument.createElement = function(nodeName) {
    //abort shiv
    if (!html5.shivMethods) {
        return data.createElem(nodeName);
    }
    return createElement(nodeName, ownerDocument, data);
  };

  ownerDocument.createDocumentFragment = Function('h,f', 'return function(){' +
    'var n=f.cloneNode(),c=n.createElement;' +
    'h.shivMethods&&(' +
      // unroll the `createElement` calls
      getElements().join().replace(/[\w\-]+/g, function(nodeName) {
        data.createElem(nodeName);
        data.frag.createElement(nodeName);
        return 'c("' + nodeName + '")';
      }) +
    ');return n}'
  )(html5, data.frag);
}

/*--------------------------------------------------------------------------*/

/**
 * Shivs the given document.
 * @memberOf html5
 * @param {Document} ownerDocument The document to shiv.
 * @returns {Document} The shived document.
 */
function shivDocument(ownerDocument) {
  if (!ownerDocument) {
      ownerDocument = document;
  }
  var data = getExpandoData(ownerDocument);

  if (html5.shivCSS && !supportsHtml5Styles && !data.hasCSS) {
    data.hasCSS = !!addStyleSheet(ownerDocument,
      // corrects block display not defined in IE6/7/8/9
      'article,aside,dialog,figcaption,figure,footer,header,hgroup,main,nav,section{display:block}' +
      // adds styling not present in IE6/7/8/9
      'mark{background:#FF0;color:#000}' +
      // hides non-rendered elements
      'template{display:none}'
    );
  }
  if (!supportsUnknownElements) {
    shivMethods(ownerDocument, data);
  }
  return ownerDocument;
}

/*--------------------------------------------------------------------------*/

/**
 * The `html5` object is exposed so that more elements can be shived and
 * existing shiving can be detected on iframes.
 * @type Object
 * @example
 *
 * // options can be changed before the script is included
 * html5 = { 'elements': 'mark section', 'shivCSS': false, 'shivMethods': false };
 */
var html5 = {

  /**
   * An array or space separated string of node names of the elements to shiv.
   * @memberOf html5
   * @type Array|String
   */
  'elements': options.elements || 'abbr article aside audio bdi canvas data datalist details dialog figcaption figure footer header hgroup main mark meter nav output progress section summary template time video',

  /**
   * current version of html5shiv
   */
  'version': version,

  /**
   * A flag to indicate that the HTML5 style sheet should be inserted.
   * @memberOf html5
   * @type Boolean
   */
  'shivCSS': (options.shivCSS !== false),

  /**
   * Is equal to true if a browser supports creating unknown/HTML5 elements
   * @memberOf html5
   * @type boolean
   */
  'supportsUnknownElements': supportsUnknownElements,

  /**
   * A flag to indicate that the document's `createElement` and `createDocumentFragment`
   * methods should be overwritten.
   * @memberOf html5
   * @type Boolean
   */
  'shivMethods': (options.shivMethods !== false),

  /**
   * A string to describe the type of `html5` object ("default" or "default print").
   * @memberOf html5
   * @type String
   */
  'type': 'default',

  // shivs the document according to the specified `html5` object options
  'shivDocument': shivDocument,

  //creates a shived element
  createElement: createElement,

  //creates a shived documentFragment
  createDocumentFragment: createDocumentFragment
};

/*--------------------------------------------------------------------------*/

// expose html5
window.html5 = html5;

// shiv the document
shivDocument(document);

}(this, document));