WordPress/wp-includes/js/shortcode.js

216 lines
6.6 KiB
JavaScript

// Utility functions for parsing and handling shortcodes in Javascript.
// Ensure the global `wp` object exists.
if ( typeof wp === 'undefined' )
var 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[6] === ']' )
return wp.shortcode.next( tag, text, re.lastIndex );
result = {
index: match.index,
content: match[0],
shortcode: new wp.shortcode.Match( match )
};
// If we matched a leading `[`, strip it from the match
// and increment the index accordingly.
if ( match[1] ) {
result.match = result.match.slice( 1 );
result.index++;
}
// If we matched a trailing `]`, strip it from the match.
if ( match[6] )
result.match = result.match.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, closing, content, right, offset ) {
// 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( new wp.shortcode.Match( 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 shortcode RegExp.
//
// 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. An extra `]` to allow for escaping shortcodes with double `[[]]`
regexp: _.memoize( function( tag ) {
return new RegExp( '\\[(\\[?)(' + tag + ')\\b([^\\]\\/]*(?:\\/(?!\\])[^\\]\\/]*)*?)(?:(\\/)\\]|\\](?:([^\\[]*(?:\\[(?!\\/\\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
};
})
};
// Shortcode Matches
// -----------------
//
// Shortcode matches are generated automatically when using
// `wp.shortcode.next()` and `wp.shortcode.replace()`. These two methods
// should handle most shortcode needs.
//
// 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()`.
wp.shortcode.Match = function( match ) {
this.tag = match[2];
this.attrs = wp.shortcode.attrs( match[3] );
this.single = !! match[4];
this.content = match[5];
};
_.extend( wp.shortcode.Match.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 text.
text: 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 singular, self-close the tag and
// ignore any additional content.
if ( this.single )
return text + ' /]';
// Complete the opening tag.
text += ']';
if ( this.content )
text += this.content;
// Add the closing tag.
return text + '[/' + this.tag + ']';
}
});
}());