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/**
 * The reveal.js markdown plugin. Handles parsing of
 * markdown inside of presentations as well as loading
 * of external markdown documents.
 */
(function( root, factory ) {
	if (typeof define === 'function' && define.amd) {
		root.marked = require( './marked' );
		root.RevealMarkdown = factory( root.marked );
		root.RevealMarkdown.initialize();
	} else if( typeof exports === 'object' ) {
		module.exports = factory( require( './marked' ) );
	} else {
		// Browser globals (root is window)
		root.RevealMarkdown = factory( root.marked );
		root.RevealMarkdown.initialize();
	}
}( this, function( marked ) {

	var DEFAULT_SLIDE_SEPARATOR = '^\r?\n---\r?\n$',
		DEFAULT_NOTES_SEPARATOR = 'notes?:',
		DEFAULT_ELEMENT_ATTRIBUTES_SEPARATOR = '\\\.element\\\s*?(.+?)$',
		DEFAULT_SLIDE_ATTRIBUTES_SEPARATOR = '\\\.slide:\\\s*?(\\\S.+?)$';

	var SCRIPT_END_PLACEHOLDER = '__SCRIPT_END__';


	/**
	 * Retrieves the markdown contents of a slide section
	 * element. Normalizes leading tabs/whitespace.
	 */
	function getMarkdownFromSlide( section ) {

		// look for a <script> or <textarea data-template> wrapper
		var template = section.querySelector( '[data-template]' ) || section.querySelector( 'script' );

		// strip leading whitespace so it isn't evaluated as code
		var text = ( template || section ).textContent;

		// restore script end tags
		text = text.replace( new RegExp( SCRIPT_END_PLACEHOLDER, 'g' ), '</script>' );

		var leadingWs = text.match( /^\n?(\s*)/ )[1].length,
			leadingTabs = text.match( /^\n?(\t*)/ )[1].length;

		if( leadingTabs > 0 ) {
			text = text.replace( new RegExp('\\n?\\t{' + leadingTabs + '}','g'), '\n' );
		}
		else if( leadingWs > 1 ) {
			text = text.replace( new RegExp('\\n? {' + leadingWs + '}', 'g'), '\n' );
		}

		return text;

	}

	/**
	 * Given a markdown slide section element, this will
	 * return all arguments that aren't related to markdown
	 * parsing. Used to forward any other user-defined arguments
	 * to the output markdown slide.
	 */
	function getForwardedAttributes( section ) {

		var attributes = section.attributes;
		var result = [];

		for( var i = 0, len = attributes.length; i < len; i++ ) {