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/** * Utility functions for parsing and handling shortcodes in JavaScript. * * @output site-inc/js/shortcode.js */ /** * Ensure the global `wp` object exists. * * @namespace wp */ 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 `site-inc/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 `site-inc/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. A numeric attribute in single quotes. // 9. An unquoted numeric attribute. pattern = /([\w-]+)\s*=\s*"([^"]*)"(?:\s|$)|([\w-]+)\s*=\s*'([^']*)'(?:\s|$)|([\w-]+)\s*=\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] ); } else if ( match[9] ) { numeric.push( match[9] ); } } 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; // 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 + '>'; } }); }());
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