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