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  2/**
  3 * Utility functions for parsing and handling shortcodes in JavaScript.
  4 *
  5 * @output wp-includes/js/shortcode.js
  6 */
  7
  8/**
  9 * Ensure the global `wp` object exists.
 10 *
 11 * @namespace wp
 12 */
 13window.wp = window.wp || {};
 14
 15(function(){
 16	wp.shortcode = {
 17		/*
 18		 * ### Find the next matching shortcode.
 19		 *
 20		 * Given a shortcode `tag`, a block of `text`, and an optional starting
 21		 * `index`, returns the next matching shortcode or `undefined`.
 22		 *
 23		 * Shortcodes are formatted as an object that contains the match
 24		 * `content`, the matching `index`, and the parsed `shortcode` object.
 25		 */
 26		next: function( tag, text, index ) {
 27			var re = wp.shortcode.regexp( tag ),
 28				match, result;
 29
 30			re.lastIndex = index || 0;
 31			match = re.exec( text );
 32
 33			if ( ! match ) {
 34				return;
 35			}
 36
 37			// If we matched an escaped shortcode, try again.
 38			if ( '[' === match[1] && ']' === match[7] ) {
 39				return wp.shortcode.next( tag, text, re.lastIndex );
 40			}
 41
 42			result = {
 43				index:     match.index,
 44				content:   match[0],
 45				shortcode: wp.shortcode.fromMatch( match )
 46			};
 47
 48			// If we matched a leading `[`, strip it from the match
 49			// and increment the index accordingly.
 50			if ( match[1] ) {
 51				result.content = result.content.slice( 1 );
 52				result.index++;
 53			}
 54
 55			// If we matched a trailing `]`, strip it from the match.
 56			if ( match[7] ) {
 57				result.content = result.content.slice( 0, -1 );
 58			}
 59
 60			return result;
 61		},
 62
 63		/*
 64		 * ### Replace matching shortcodes in a block of text.
 65		 *
 66		 * Accepts a shortcode `tag`, content `text` to scan, and a `callback`
 67		 * to process the shortcode matches and return a replacement string.
 68		 * Returns the `text` with all shortcodes replaced.
 69		 *
 70		 * Shortcode matches are objects that contain the shortcode `tag`,
 71		 * a shortcode `attrs` object, the `content` between shortcode tags,
 72		 * and a boolean flag to indicate if the match was a `single` tag.
 73		 */
 74		replace: function( tag, text, callback ) {
 75			return text.replace( wp.shortcode.regexp( tag ), function( match, left, tag, attrs, slash, content, closing, right ) {
 76				// If both extra brackets exist, the shortcode has been
 77				// properly escaped.
 78				if ( left === '[' && right === ']' ) {
 79					return match;
 80				}
 81
 82				// Create the match object and pass it through the callback.
 83				var result = callback( wp.shortcode.fromMatch( arguments ) );
 84
 85				// Make sure to return any of the extra brackets if they
 86				// weren't used to escape the shortcode.
 87				return result ? left + result + right : match;
 88			});
 89		},
 90
 91		/*
 92		 * ### Generate a string from shortcode parameters.
 93		 *
 94		 * Creates a `wp.shortcode` instance and returns a string.
 95		 *
 96		 * Accepts the same `options` as the `wp.shortcode()` constructor,
 97		 * containing a `tag` string, a string or object of `attrs`, a boolean
 98		 * indicating whether to format the shortcode using a `single` tag, and a
 99		 * `content` string.
100		 */
101		string: function( options ) {
102			return new wp.shortcode( options ).string();
103		},
104
105		/*
106		 * ### Generate a RegExp to identify a shortcode.
107		 *
108		 * The base regex is functionally equivalent to the one found in
109		 * `get_shortcode_regex()` in `wp-includes/shortcodes.php`.
110		 *
111		 * Capture groups:
112		 *
113		 * 1. An extra `[` to allow for escaping shortcodes with double `[[]]`.
114		 * 2. The shortcode name.
115		 * 3. The shortcode argument list.
116		 * 4. The self closing `/`.
117		 * 5. The content of a shortcode when it wraps some content.
118		 * 6. The closing tag.
119		 * 7. An extra `]` to allow for escaping shortcodes with double `[[]]`.
120		 */
121		regexp: _.memoize( function( tag ) {
122			return new RegExp( '\\[(\\[?)(' + tag + ')(?![\\w-])([^\\]\\/]*(?:\\/(?!\\])[^\\]\\/]*)*?)(?:(\\/)\\]|\\](?:([^\\[]*(?:\\[(?!\\/\\2\\])[^\\[]*)*)(\\[\\/\\2\\]))?)(\\]?)', 'g' );
123		}),
124
125
126		/*
127		 * ### Parse shortcode attributes.
128		 *
129		 * Shortcodes accept many types of attributes. These can chiefly be
130		 * divided into named and numeric attributes:
131		 *
132		 * Named attributes are assigned on a key/value basis, while numeric
133		 * attributes are treated as an array.
134		 *
135		 * Named attributes can be formatted as either `name="value"`,
136		 * `name='value'`, or `name=value`. Numeric attributes can be formatted
137		 * as `"value"` or just `value`.
138		 */
139		attrs: _.memoize( function( text ) {
140			var named   = {},
141				numeric = [],
142				pattern, match;
143
144			/*
145			 * This regular expression is reused from `shortcode_parse_atts()`
146			 * in `wp-includes/shortcodes.php`.
147			 *
148			 * Capture groups:
149			 *
150			 * 1. An attribute name, that corresponds to...
151			 * 2. a value in double quotes.
152			 * 3. An attribute name, that corresponds to...
153			 * 4. a value in single quotes.
154			 * 5. An attribute name, that corresponds to...
155			 * 6. an unquoted value.
156			 * 7. A numeric attribute in double quotes.
157			 * 8. A numeric attribute in single quotes.
158			 * 9. An unquoted numeric attribute.
159			 */
160			pattern = /([\w-]+)\s*=\s*"([^"]*)"(?:\s|$)|([\w-]+)\s*=\s*'([^']*)'(?:\s|$)|([\w-]+)\s*=\s*([^\s'"]+)(?:\s|$)|"([^"]*)"(?:\s|$)|'([^']*)'(?:\s|$)|(\S+)(?:\s|$)/g;
161
162			// Map zero-width spaces to actual spaces.
163			text = text.replace( /[\u00a0\u200b]/g, ' ' );
164
165			// Match and normalize attributes.
166			while ( (match = pattern.exec( text )) ) {
167				if ( match[1] ) {
168					named[ match[1].toLowerCase() ] = match[2];
169				} else if ( match[3] ) {
170					named[ match[3].toLowerCase() ] = match[4];
171				} else if ( match[5] ) {
172					named[ match[5].toLowerCase() ] = match[6];
173				} else if ( match[7] ) {
174					numeric.push( match[7] );
175				} else if ( match[8] ) {
176					numeric.push( match[8] );
177				} else if ( match[9] ) {
178					numeric.push( match[9] );
179				}
180			}
181
182			return {
183				named:   named,
184				numeric: numeric
185			};
186		}),
187
188		/*
189		 * ### Generate a Shortcode Object from a RegExp match.
190		 *
191		 * Accepts a `match` object from calling `regexp.exec()` on a `RegExp`
192		 * generated by `wp.shortcode.regexp()`. `match` can also be set
193		 * to the `arguments` from a callback passed to `regexp.replace()`.
194		 */
195		fromMatch: function( match ) {
196			var type;
197
198			if ( match[4] ) {
199				type = 'self-closing';
200			} else if ( match[6] ) {
201				type = 'closed';
202			} else {
203				type = 'single';
204			}
205
206			return new wp.shortcode({
207				tag:     match[2],
208				attrs:   match[3],
209				type:    type,
210				content: match[5]
211			});
212		}
213	};
214
215
216	/*
217	 * Shortcode Objects
218	 * -----------------
219	 *
220	 * Shortcode objects are generated automatically when using the main
221	 * `wp.shortcode` methods: `next()`, `replace()`, and `string()`.
222	 *
223	 * To access a raw representation of a shortcode, pass an `options` object,
224	 * containing a `tag` string, a string or object of `attrs`, a string
225	 * indicating the `type` of the shortcode ('single', 'self-closing',
226	 * or 'closed'), and a `content` string.
227	 */
228	wp.shortcode = _.extend( function( options ) {
229		_.extend( this, _.pick( options || {}, 'tag', 'attrs', 'type', 'content' ) );
230
231		var attrs = this.attrs;
232
233		// Ensure we have a correctly formatted `attrs` object.
234		this.attrs = {
235			named:   {},
236			numeric: []
237		};
238
239		if ( ! attrs ) {
240			return;
241		}
242
243		// Parse a string of attributes.
244		if ( _.isString( attrs ) ) {
245			this.attrs = wp.shortcode.attrs( attrs );
246
247		// Identify a correctly formatted `attrs` object.
248		} else if ( _.difference( _.keys( attrs ), [ 'named', 'numeric' ] ).length === 0 ) {
249			this.attrs = _.defaults( attrs, this.attrs );
250
251		// Handle a flat object of attributes.
252		} else {
253			_.each( options.attrs, function( value, key ) {
254				this.set( key, value );
255			}, this );
256		}
257	}, wp.shortcode );
258
259	_.extend( wp.shortcode.prototype, {
260		/*
261		 * ### Get a shortcode attribute.
262		 *
263		 * Automatically detects whether `attr` is named or numeric and routes
264		 * it accordingly.
265		 */
266		get: function( attr ) {
267			return this.attrs[ _.isNumber( attr ) ? 'numeric' : 'named' ][ attr ];
268		},
269
270		/*
271		 * ### Set a shortcode attribute.
272		 *
273		 * Automatically detects whether `attr` is named or numeric and routes
274		 * it accordingly.
275		 */
276		set: function( attr, value ) {
277			this.attrs[ _.isNumber( attr ) ? 'numeric' : 'named' ][ attr ] = value;
278			return this;
279		},
280
281		// ### Transform the shortcode match into a string.
282		string: function() {
283			var text    = '[' + this.tag;
284
285			_.each( this.attrs.numeric, function( value ) {
286				if ( /\s/.test( value ) ) {
287					text += ' "' + value + '"';
288				} else {
289					text += ' ' + value;
290				}
291			});
292
293			_.each( this.attrs.named, function( value, name ) {
294				text += ' ' + name + '="' + value + '"';
295			});
296
297			// If the tag is marked as `single` or `self-closing`, close the
298			// tag and ignore any additional content.
299			if ( 'single' === this.type ) {
300				return text + ']';
301			} else if ( 'self-closing' === this.type ) {
302				return text + ' /]';
303			}
304
305			// Complete the opening tag.
306			text += ']';
307
308			if ( this.content ) {
309				text += this.content;
310			}
311
312			// Add the closing tag.
313			return text + '[/' + this.tag + ']';
314		}
315	});
316}());
317
318/*
319 * HTML utility functions
320 * ----------------------
321 *
322 * Experimental. These functions may change or be removed in the future.
323 */
324(function(){
325	wp.html = _.extend( wp.html || {}, {
326		/*
327		 * ### Parse HTML attributes.
328		 *
329		 * Converts `content` to a set of parsed HTML attributes.
330		 * Utilizes `wp.shortcode.attrs( content )`, which is a valid superset of
331		 * the HTML attribute specification. Reformats the attributes into an
332		 * object that contains the `attrs` with `key:value` mapping, and a record
333		 * of the attributes that were entered using `empty` attribute syntax (i.e.
334		 * with no value).
335		 */
336		attrs: function( content ) {
337			var result, attrs;
338
339			// If `content` ends in a slash, strip it.
340			if ( '/' === content[ content.length - 1 ] ) {
341				content = content.slice( 0, -1 );
342			}
343
344			result = wp.shortcode.attrs( content );
345			attrs  = result.named;
346
347			_.each( result.numeric, function( key ) {
348				if ( /\s/.test( key ) ) {
349					return;
350				}
351
352				attrs[ key ] = '';
353			});
354
355			return attrs;
356		},
357
358		// ### Convert an HTML-representation of an object to a string.
359		string: function( options ) {
360			var text = '<' + options.tag,
361				content = options.content || '';
362
363			_.each( options.attrs, function( value, attr ) {
364				text += ' ' + attr;
365
366				// Convert boolean values to strings.
367				if ( _.isBoolean( value ) ) {
368					value = value ? 'true' : 'false';
369				}
370
371				text += '="' + value + '"';
372			});
373
374			// Return the result if it is a self-closing tag.
375			if ( options.single ) {
376				return text + ' />';
377			}
378
379			// Complete the opening tag.
380			text += '>';
381
382			// If `content` is an object, recursively call this function.
383			text += _.isObject( content ) ? wp.html.string( content ) : content;
384
385			return text + '</' + options.tag + '>';
386		}
387	});
388}());
389