text: // Utility functions for parsing and handling shortcodes in Javascript.
  
  // Ensure the global `wp` object exists.
  window.wp = window.wp || {};
  
  (function(){
  	wp.shortcode = {
  		// ### Find the next matching shortcode
  		//
  		// Given a shortcode `tag`, a block of `text`, and an optional starting
  		// `index`, returns the next matching shortcode or `undefined`.
  		//
  		// Shortcodes are formatted as an object that contains the match
  		// `content`, the matching `index`, and the parsed `shortcode` object.
  		next: function( tag, text, index ) {
  			var re = wp.shortcode.regexp( tag ),
  				match, result;
  
  			re.lastIndex = index || 0;
  			match = re.exec( text );
  
  			if ( ! match ) {
  				return;
  			}
  
  			// If we matched an escaped shortcode, try again.
  			if ( '[' === match[1] && ']' === match[7] ) {
  				return wp.shortcode.next( tag, text, re.lastIndex );
  			}
  
  			result = {
  				index:     match.index,
  				content:   match[0],
  				shortcode: wp.shortcode.fromMatch( match )
  			};
  
  			// If we matched a leading `[`, strip it from the match
  			// and increment the index accordingly.
  			if ( match[1] ) {
  				result.content = result.content.slice( 1 );
  				result.index++;
  			}
  
  			// If we matched a trailing `]`, strip it from the match.
  			if ( match[7] ) {
  				result.content = result.content.slice( 0, -1 );
  			}
  
  			return result;
  		},
  
  		// ### Replace matching shortcodes in a block of text
  		//
  		// Accepts a shortcode `tag`, content `text` to scan, and a `callback`
  		// to process the shortcode matches and return a replacement string.
  		// Returns the `text` with all shortcodes replaced.
  		//
  		// Shortcode matches are objects that contain the shortcode `tag`,
  		// a shortcode `attrs` object, the `content` between shortcode tags,
  		// and a boolean flag to indicate if the match was a `single` tag.
  		replace: function( tag, text, callback ) {
  			return text.replace( wp.shortcode.regexp( tag ), function( match, left, tag, attrs, slash, content, closing, right ) {
  				// If both extra brackets exist, the shortcode has been
  				// properly escaped.
  				if ( left === '[' && right === ']' ) {
  					return match;
  				}
  
  				// Create the match object and pass it through the callback.
  				var result = callback( wp.shortcode.fromMatch( arguments ) );
  
  				// Make sure to return any of the extra brackets if they
  				// weren't used to escape the shortcode.
  				return result ? left + result + right : match;
  			});
  		},
  
  		// ### Generate a string from shortcode parameters
  		//
  		// Creates a `wp.shortcode` instance and returns a string.
  		//
  		// Accepts the same `options` as the `wp.shortcode()` constructor,
  		// containing a `tag` string, a string or object of `attrs`, a boolean
  		// indicating whether to format the shortcode using a `single` tag, and a
  		// `content` string.
  		string: function( options ) {
  			return new wp.shortcode( options ).string();
  		},
  
  		// ### Generate a RegExp to identify a shortcode
  		//
  		// The base regex is functionally equivalent to the one found in
  		// `get_shortcode_regex()` in `wp-includes/shortcodes.php`.
  		//
  		// Capture groups:
  		//
  		// 1. An extra `[` to allow for escaping shortcodes with double `[[]]`
  		// 2. The shortcode name
  		// 3. The shortcode argument list
  		// 4. The self closing `/`
  		// 5. The content of a shortcode when it wraps some content.
  		// 6. The closing tag.
  		// 7. An extra `]` to allow for escaping shortcodes with double `[[]]`
  		regexp: _.memoize( function( tag ) {
  			return new RegExp( '\\[(\\[?)(' + tag + ')(?![\\w-])([^\\]\\/]*(?:\\/(?!\\])[^\\]\\/]*)*?)(?:(\\/)\\]|\\](?:([^\\[]*(?:\\[(?!\\/\\2\\])[^\\[]*)*)(\\[\\/\\2\\]))?)(\\]?)', 'g' );
  		}),
  
  
  		// ### Parse shortcode attributes
  		//
  		// Shortcodes accept many types of attributes. These can chiefly be
  		// divided into named and numeric attributes:
  		//
  		// Named attributes are assigned on a key/value basis, while numeric
  		// attributes are treated as an array.
  		//
  		// Named attributes can be formatted as either `name="value"`,
  		// `name='value'`, or `name=value`. Numeric attributes can be formatted
  		// as `"value"` or just `value`.
  		attrs: _.memoize( function( text ) {
  			var named   = {},
  				numeric = [],
  				pattern, match;
  
  			// This regular expression is reused from `shortcode_parse_atts()`
  			// in `wp-includes/shortcodes.php`.
  			//
  			// Capture groups:
  			//
  			// 1. An attribute name, that corresponds to...
  			// 2. a value in double quotes.
  			// 3. An attribute name, that corresponds to...
  			// 4. a value in single quotes.
  			// 5. An attribute name, that corresponds to...
  			// 6. an unquoted value.
  			// 7. A numeric attribute in double quotes.
  			// 8. An unquoted numeric attribute.
  			pattern = /(\w+)\s*=\s*"([^"]*)"(?:\s|$)|(\w+)\s*=\s*\'([^\']*)\'(?:\s|$)|(\w+)\s*=\s*([^\s\'"]+)(?:\s|$)|"([^"]*)"(?:\s|$)|(\S+)(?:\s|$)/g;
  
  			// Map zero-width spaces to actual spaces.
  			text = text.replace( /[\u00a0\u200b]/g, ' ' );
  
  			// Match and normalize attributes.
  			while ( (match = pattern.exec( text )) ) {
  				if ( match[1] ) {
  					named[ match[1].toLowerCase() ] = match[2];
  				} else if ( match[3] ) {
  					named[ match[3].toLowerCase() ] = match[4];
  				} else if ( match[5] ) {
  					named[ match[5].toLowerCase() ] = match[6];
  				} else if ( match[7] ) {
  					numeric.push( match[7] );
  				} else if ( match[8] ) {
  					numeric.push( match[8] );
  				}
  			}
  
  			return {
  				named:   named,
  				numeric: numeric
  			};
  		}),
  
  		// ### Generate a Shortcode Object from a RegExp match
  		// Accepts a `match` object from calling `regexp.exec()` on a `RegExp`
  		// generated by `wp.shortcode.regexp()`. `match` can also be set to the
  		// `arguments` from a callback passed to `regexp.replace()`.
  		fromMatch: function( match ) {
  			var type;
  
  			if ( match[4] ) {
  				type = 'self-closing';
  			} else if ( match[6] ) {
  				type = 'closed';
  			} else {
  				type = 'single';
  			}
  
  			return new wp.shortcode({
  				tag:     match[2],
  				attrs:   match[3],
  				type:    type,
  				content: match[5]
  			});
  		}
  	};
  
  
  	// Shortcode Objects
  	// -----------------
  	//
  	// Shortcode objects are generated automatically when using the main
  	// `wp.shortcode` methods: `next()`, `replace()`, and `string()`.
  	//
  	// To access a raw representation of a shortcode, pass an `options` object,
  	// containing a `tag` string, a string or object of `attrs`, a string
  	// indicating the `type` of the shortcode ('single', 'self-closing', or
  	// 'closed'), and a `content` string.
  	wp.shortcode = _.extend( function( options ) {
  		_.extend( this, _.pick( options || {}, 'tag', 'attrs', 'type', 'content' ) );
  
  		var attrs = this.attrs;
  
  		// Ensure we have a correctly formatted `attrs` object.
  		this.attrs = {
  			named:   {},
  			numeric: []
  		};
  
  		if ( ! attrs ) {
  			return;
  		}
  
  		// Parse a string of attributes.
  		if ( _.isString( attrs ) ) {
  			this.attrs = wp.shortcode.attrs( attrs );
  
  		// Identify a correctly formatted `attrs` object.
  		} else if ( _.isEqual( _.keys( attrs ), [ 'named', 'numeric' ] ) ) {
  			this.attrs = attrs;
  
  		// Handle a flat object of attributes.
  		} else {
  			_.each( options.attrs, function( value, key ) {
  				this.set( key, value );
  			}, this );
  		}
  	}, wp.shortcode );
  
  	_.extend( wp.shortcode.prototype, {
  		// ### Get a shortcode attribute
  		//
  		// Automatically detects whether `attr` is named or numeric and routes
  		// it accordingly.
  		get: function( attr ) {
  			return this.attrs[ _.isNumber( attr ) ? 'numeric' : 'named' ][ attr ];
  		},
  
  		// ### Set a shortcode attribute
  		//
  		// Automatically detects whether `attr` is named or numeric and routes
  		// it accordingly.
  		set: function( attr, value ) {
  			this.attrs[ _.isNumber( attr ) ? 'numeric' : 'named' ][ attr ] = value;
  			return this;
  		},
  
  		// ### Transform the shortcode match into a string
  		string: function() {
  			var text    = '[' + this.tag;
  
  			_.each( this.attrs.numeric, function( value ) {
  				if ( /\s/.test( value ) ) {
  					text += ' "' + value + '"';
  				} else {
  					text += ' ' + value;
  				}
  			});
  
  			_.each( this.attrs.named, function( value, name ) {
  				text += ' ' + name + '="' + value + '"';
  			});
  
  			// If the tag is marked as `single` or `self-closing`, close the
  			// tag and ignore any additional content.
  			if ( 'single' === this.type ) {
  				return text + ']';
  			} else if ( 'self-closing' === this.type ) {
  				return text + ' /]';
  			}
  
  			// Complete the opening tag.
  			text += ']';
  
  			if ( this.content ) {
  				text += this.content;
  			}
  
  			// Add the closing tag.
  			return text + '[/' + this.tag + ']';
  		}
  	});
  }());
  
  // HTML utility functions
  // ----------------------
  //
  // Experimental. These functions may change or be removed in the future.
  (function(){
  	wp.html = _.extend( wp.html || {}, {
  		// ### Parse HTML attributes.
  		//
  		// Converts `content` to a set of parsed HTML attributes.
  		// Utilizes `wp.shortcode.attrs( content )`, which is a valid superset of
  		// the HTML attribute specification. Reformats the attributes into an
  		// object that contains the `attrs` with `key:value` mapping, and a record
  		// of the attributes that were entered using `empty` attribute syntax (i.e.
  		// with no value).
  		attrs: function( content ) {
  			var result, attrs;
  
  			// If `content` ends in a slash, strip it.
  			if ( '/' === content[ content.length - 1 ] ) {
  				content = content.slice( 0, -1 );
  			}
  
  			result = wp.shortcode.attrs( content );
  			attrs  = result.named;
  
  			_.each( result.numeric, function( key ) {
  				if ( /\s/.test( key ) ) {
  					return;
  				}
  
  				attrs[ key ] = '';
  			});
  
  			return attrs;
  		},
  
  		// ### Convert an HTML-representation of an object to a string.
  		string: function( options ) {
  			var text = '<' + options.tag,
  				content = options.content || '';
  
  			_.each( options.attrs, function( value, attr ) {
  				text += ' ' + attr;
  
  				// Use empty attribute notation where possible.
  				if ( '' === value ) {
  					return;
  				}
  
  				// Convert boolean values to strings.
  				if ( _.isBoolean( value ) ) {
  					value = value ? 'true' : 'false';
  				}
  
  				text += '="' + value + '"';
  			});
  
  			// Return the result if it is a self-closing tag.
  			if ( options.single ) {
  				return text + ' />';
  			}
  
  			// Complete the opening tag.
  			text += '>';
  
  			// If `content` is an object, recursively call this function.
  			text += _.isObject( content ) ? wp.html.string( content ) : content;
  
  			return text + '</' + options.tag + '>';
  		}
  	});
  }());