001    /**
002     * Copyright (c) 2000-2013 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.servlet.filters.dynamiccss;
016    
017    import com.liferay.portal.kernel.log.Log;
018    import com.liferay.portal.kernel.log.LogFactoryUtil;
019    import com.liferay.portal.kernel.util.StringUtil;
020    import com.liferay.portal.util.ClassLoaderUtil;
021    import com.liferay.portal.util.PropsValues;
022    
023    import java.util.regex.Matcher;
024    import java.util.regex.Pattern;
025    
026    import org.mozilla.javascript.Context;
027    import org.mozilla.javascript.Function;
028    import org.mozilla.javascript.ScriptableObject;
029    
030    /**
031     * @author Eduardo Garcia
032     */
033    public class RTLCSSUtil {
034    
035            public static String getRtlCss(String fileName, String css)
036                    throws Exception {
037    
038                    Context context = Context.enter();
039    
040                    String rtlCss = css;
041    
042                    try {
043                            ScriptableObject scope = context.initStandardObjects();
044    
045                            context.evaluateString(scope, _jsScript, "script", 1, null);
046    
047                            Function function = (Function)scope.get("r2", scope);
048    
049                            Object result = function.call(
050                                    context, scope, scope, new Object[] {css});
051    
052                            rtlCss = (String)Context.jsToJava(result, String.class);
053                    }
054                    catch (Exception e) {
055                            if (_log.isDebugEnabled()) {
056                                    _log.debug("Unable to parse " + fileName + " to RTL");
057                            }
058                    }
059                    finally {
060                            Context.exit();
061                    }
062    
063                    return rtlCss;
064            }
065    
066            public static void init() {
067                    try {
068                            _jsScript = StringUtil.read(
069                                    ClassLoaderUtil.getPortalClassLoader(),
070                                    "com/liferay/portal/servlet/filters/dynamiccss" +
071                                            "/dependencies/r2.js");
072                    }
073                    catch (Exception e) {
074                            _log.error(e, e);
075                    }
076            }
077    
078            public static boolean isExcludedPath(String filePath) {
079                    for (Pattern pattern : _RTL_CSS_EXCLUDED_PATHS_PATTERNS) {
080                            Matcher matcher = pattern.matcher(filePath);
081    
082                            if (matcher.matches()) {
083                                    return true;
084                            }
085                    }
086    
087                    return false;
088            }
089    
090            private static Log _log = LogFactoryUtil.getLog(RTLCSSUtil.class);
091    
092            private static Pattern[] _RTL_CSS_EXCLUDED_PATHS_PATTERNS;
093    
094            static {
095                    String[] rtlCssExcludedPathsRegexp =
096                            PropsValues.RTL_CSS_EXCLUDED_PATHS_REGEXP;
097    
098                    _RTL_CSS_EXCLUDED_PATHS_PATTERNS =
099                            new Pattern[rtlCssExcludedPathsRegexp.length];
100    
101                    for (int i = 0; i < rtlCssExcludedPathsRegexp.length; i++) {
102                            _RTL_CSS_EXCLUDED_PATHS_PATTERNS[i] = Pattern.compile(
103                                    rtlCssExcludedPathsRegexp[i]);
104                    }
105            }
106    
107            private static String _jsScript;
108    
109    }