source: trunk/admin/inc/ckeditor/_source/plugins/stylesheetparser/plugin.js@ 428

/*
Copyright (c) 2003-2011, CKSource - Frederico Knabben. All rights reserved.
For licensing, see LICENSE.html or http://ckeditor.com/license
*/

/**
 * @stylesheetParser plugin.
 */

(function()
{
        // We want to extract only the elements with classes defined in the stylesheets:
        function parseClasses( aRules, skipSelectors, validSelectors )
        {
                // aRules are just the different rules in the style sheets
                // We want to merge them and them split them by commas, so we end up with only
                // the selectors
                var s = aRules.join(' ');
                // Remove selectors splitting the elements, leave only the class selector (.)
                s = s.replace( /(,|>|\+|~)/g, ' ' );
                // Remove attribute selectors: table[border="0"]
                s = s.replace( /\[[^\]]*/g, '' );
                // Remove Ids: div#main
                s = s.replace( /#[^\s]*/g, '' );
                // Remove pseudo-selectors and pseudo-elements: :hover :nth-child(2n+1) ::before
                s = s.replace( /\:{1,2}[^\s]*/g, '' );

                s = s.replace( /\s+/g, ' ' );

                var aSelectors = s.split( ' ' ),
                        aClasses = [];

                for ( var i = 0; i < aSelectors.length ; i++ )
                {
                        var selector = aSelectors[ i ];

                        if ( validSelectors.test( selector ) && !skipSelectors.test( selector ) )
                        {
                                // If we still don't know about this one, add it
                                if ( CKEDITOR.tools.indexOf( aClasses, selector ) == -1 )
                                        aClasses.push( selector );
                        }
                }

                return aClasses;
        }

        function LoadStylesCSS( theDoc, skipSelectors, validSelectors )
        {
                var styles = [],
                        // It will hold all the rules of the applied stylesheets (except those internal to CKEditor)
                        aRules = [],
                        i;

                for ( i = 0; i < theDoc.styleSheets.length; i++ )
                {
                        var sheet = theDoc.styleSheets[ i ],
                                node = sheet.ownerNode || sheet.owningElement;

                        // Skip the internal stylesheets
                        if ( node.getAttribute( 'data-cke-temp' ) )
                                continue;

                        // Exclude stylesheets injected by extensions
                        if ( sheet.href && sheet.href.substr(0, 9) == 'chrome://' )
                                continue;

                        var sheetRules = sheet.cssRules || sheet.rules;
                        for ( var j = 0; j < sheetRules.length; j++ )
                                aRules.push( sheetRules[ j ].selectorText );
                }

                var aClasses = parseClasses( aRules, skipSelectors, validSelectors );

                // Add each style to our "Styles" collection.
                for ( i = 0; i < aClasses.length; i++ )
                {
                        var oElement = aClasses[ i ].split( '.' ),
                                element = oElement[ 0 ].toLowerCase(),
                                sClassName = oElement[ 1 ];

                        styles.push( {
                                name : element + '.' + sClassName,
                                element : element,
                                attributes : {'class' : sClassName}
                        });
                }

                return styles;
        }

        // Register a plugin named "stylesheetparser".
        CKEDITOR.plugins.add( 'stylesheetparser',
        {
                requires: [ 'styles' ],
                onLoad : function()
                {
                        var obj = CKEDITOR.editor.prototype;
                        obj.getStylesSet = CKEDITOR.tools.override( obj.getStylesSet,  function( org )
                        {
                                return function( callback )
                                {
                                        var self = this;
                                        org.call( this, function( definitions )
                                        {
                                                // Rules that must be skipped
                                                var skipSelectors = self.config.stylesheetParser_skipSelectors || ( /(^body\.|^\.)/i ),
                                                        // Rules that are valid
                                                        validSelectors = self.config.stylesheetParser_validSelectors || ( /\w+\.\w+/ );

                                                callback( ( self._.stylesDefinitions = definitions.concat( LoadStylesCSS( self.document.$, skipSelectors, validSelectors ) ) ) );
                                        });
                                };
                        });

                }
        });
})();


/**
 * A regular expression that defines whether a CSS rule will be
 * skipped by the Stylesheet Parser plugin. A CSS rule matching
 * the regular expression will be ignored and will not be available
 * in the Styles drop-down list.
 * @name CKEDITOR.config.stylesheetParser_skipSelectors
 * @type RegExp
 * @default /(^body\.|^\.)/i
 * @since 3.6
 * @see CKEDITOR.config.stylesheetParser_validSelectors
 * @example
 * // Ignore rules for body and caption elements, classes starting with "high", and any class defined for no specific element.
 * config.stylesheetParser_skipSelectors = /(^body\.|^caption\.|\.high|^\.)/i;
 */

 /**
 * A regular expression that defines which CSS rules will be used
 * by the Stylesheet Parser plugin. A CSS rule matching the regular
 * expression will be available in the Styles drop-down list.
 * @name CKEDITOR.config.stylesheetParser_validSelectors
 * @type RegExp
 * @default /\w+\.\w+/
 * @since 3.6
 * @see CKEDITOR.config.stylesheetParser_skipSelectors
 * @example
 * // Only add rules for p and span elements.
 * config.stylesheetParser_validSelectors = /\^(p|span)\.\w+/;
 */