    001/*
    002 * YUI Compressor
    003 * http://developer.yahoo.com/yui/compressor/
    004 * Author: Julien Lecomte -  http://www.julienlecomte.net/
    005 * Author: Isaac Schlueter - http://foohack.com/
    006 * Author: Stoyan Stefanov - http://phpied.com/
    007 * Contributor: Dan Beam - http://danbeam.org/
    008 * Copyright (c) 2013 Yahoo! Inc.  All rights reserved.
    009 * The copyrights embodied in the content of this file are licensed
    010 * by Yahoo! Inc. under the BSD (revised) open source license.
    011 */
    012package com.yahoo.platform.yui.compressor;
    013
    014import java.io.IOException;
    015import java.io.Reader;
    016import java.io.Writer;
    017import java.util.regex.Pattern;
    018import java.util.regex.Matcher;
    019import java.util.ArrayList;
    020
    021public class CssCompressor {
    022
    023    private StringBuffer srcsb = new StringBuffer();
    024
    025    public CssCompressor(Reader in) throws IOException {
    026        // Read the stream...
    027        int c;
    028        while ((c = in.read()) != -1) {
    029            srcsb.append((char) c);
    030        }
    031    }
    032
    033    /**
    034     * @param css - full css string
    035     * @param preservedToken - token to preserve
    036     * @param tokenRegex - regex to find token
    037     * @param removeWhiteSpace - remove any white space in the token
    038     * @param preservedTokens - array of token values
    039     * @return
    040     */
    041    protected String preserveToken(String css, String preservedToken,
    042            String tokenRegex, boolean removeWhiteSpace, ArrayList preservedTokens) {
    043
    044        int maxIndex = css.length() - 1;
    045        int appendIndex = 0;
    046
    047        StringBuffer sb = new StringBuffer();
    048
    049        Pattern p = Pattern.compile(tokenRegex);
    050        Matcher m = p.matcher(css);
    051
    052        while (m.find()) {
    053            int startIndex = m.start() + (preservedToken.length() + 1);
    054            String terminator = m.group(1);
    055
    056            // skip this, if CSS was already copied to "sb" upto this position
    057            if (m.start() < appendIndex) {
    058                continue;
    059            }
    060
    061            if (terminator.length() == 0) {
    062                terminator = ")";
    063            }
    064
    065            boolean foundTerminator = false;
    066
    067            int endIndex = m.end() - 1;
    068            while(foundTerminator == false && endIndex+1 <= maxIndex) {
    069                endIndex = css.indexOf(terminator, endIndex+1);
    070
    071                if (endIndex <= 0) {
    072                    break;
    073                } else if ((endIndex > 0) && (css.charAt(endIndex-1) != '\\')) {
    074                    foundTerminator = true;
    075                    if (!")".equals(terminator)) {
    076                        endIndex = css.indexOf(")", endIndex);
    077                    }
    078                }
    079            }
    080
    081            // Enough searching, start moving stuff over to the buffer
    082            sb.append(css.substring(appendIndex, m.start()));
    083
    084            if (foundTerminator) {
    085                String token = css.substring(startIndex, endIndex);
    086                if(removeWhiteSpace)
    087                    token = token.replaceAll("\\s+", "");
    088                preservedTokens.add(token);
    089
    090                String preserver = preservedToken + "(___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.size() - 1) + "___)";
    091                sb.append(preserver);
    092
    093                appendIndex = endIndex + 1;
    094            } else {
    095                // No end terminator found, re-add the whole match. Should we throw/warn here?
    096                sb.append(css.substring(m.start(), m.end()));
    097                appendIndex = m.end();
    098            }
    099        }
    100
    101        sb.append(css.substring(appendIndex));
    102
    103        return sb.toString();
    104    }
    105
    106    public void compress(Writer out, int linebreakpos)
    107            throws IOException {
    108
    109        Pattern p;
    110        Matcher m;
    111        String css = srcsb.toString();
    112
    113        int startIndex = 0;
    114        int endIndex = 0;
    115        int i = 0;
    116        int max = 0;
    117        ArrayList preservedTokens = new ArrayList(0);
    118        ArrayList comments = new ArrayList(0);
    119        String token;
    120        int totallen = css.length();
    121        String placeholder;
    122
    123
    124        StringBuffer sb = new StringBuffer(css);
    125
    126        // collect all comment blocks...
    127        while ((startIndex = sb.indexOf("/*", startIndex)) >= 0) {
    128            endIndex = sb.indexOf("*/", startIndex + 2);
    129            if (endIndex < 0) {
    130                endIndex = totallen;
    131            }
    132
    133            token = sb.substring(startIndex + 2, endIndex);
    134            comments.add(token);
    135            sb.replace(startIndex + 2, endIndex, "___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_" + (comments.size() - 1) + "___");
    136            startIndex += 2;
    137        }
    138        css = sb.toString();
    139
    140
    141        css = this.preserveToken(css, "url", "(?i)url\\(\\s*([\"']?)data\\:\\s*image/svg\\+xml", false, preservedTokens);
    142        css = this.preserveToken(css, "url", "(?i)url\\(\\s*([\"']?)data\\:\\s*(?!(image/svg\\+xml))", true, preservedTokens);
    143        css = this.preserveToken(css, "calc",  "(?i)calc\\(\\s*([\"']?)", false, preservedTokens);
    144        css = this.preserveToken(css, "progid:DXImageTransform.Microsoft.Matrix",  "(?i)progid:DXImageTransform.Microsoft.Matrix\\s*([\"']?)", false, preservedTokens);
    145
    146
    147        // preserve strings so their content doesn't get accidentally minified
    148        sb = new StringBuffer();
    149        p = Pattern.compile("(\"([^\\\\\"]|\\\\.|\\\\)*\")|(\'([^\\\\\']|\\\\.|\\\\)*\')");
    150        m = p.matcher(css);
    151        while (m.find()) {
    152            token = m.group();
    153            char quote = token.charAt(0);
    154            token = token.substring(1, token.length() - 1);
    155
    156            // maybe the string contains a comment-like substring?
    157            // one, maybe more? put'em back then
    158            if (token.indexOf("___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_") >= 0) {
    159                for (i = 0, max = comments.size(); i < max; i += 1) {
    160                    token = token.replace("___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_" + i + "___", comments.get(i).toString());
    161                }
    162            }
    163
    164            // minify alpha opacity in filter strings
    165            token = token.replaceAll("(?i)progid:DXImageTransform.Microsoft.Alpha\\(Opacity=", "alpha(opacity=");
    166
    167            preservedTokens.add(token);
    168            String preserver = quote + "___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.size() - 1) + "___" + quote;
    169            m.appendReplacement(sb, preserver);
    170        }
    171        m.appendTail(sb);
    172        css = sb.toString();
    173
    174
    175        // strings are safe, now wrestle the comments
    176        for (i = 0, max = comments.size(); i < max; i += 1) {
    177
    178            token = comments.get(i).toString();
    179            placeholder = "___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_" + i + "___";
    180
    181            // ! in the first position of the comment means preserve
    182            // so push to the preserved tokens while stripping the !
    183            if (token.startsWith("!")) {
    184                preservedTokens.add(token);
    185                css = css.replace(placeholder,  "___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.size() - 1) + "___");
    186                continue;
    187            }
    188
    189            // \ in the last position looks like hack for Mac/IE5
    190            // shorten that to /*\*/ and the next one to /**/
    191            if (token.endsWith("\\")) {
    192                preservedTokens.add("\\");
    193                css = css.replace(placeholder,  "___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.size() - 1) + "___");
    194                i = i + 1; // attn: advancing the loop
    195                preservedTokens.add("");
    196                css = css.replace("___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_" + i + "___",  "___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.size() - 1) + "___");
    197                continue;
    198            }
    199
    200            // keep empty comments after child selectors (IE7 hack)
    201            // e.g. html >/**/ body
    202            if (token.length() == 0) {
    203                startIndex = css.indexOf(placeholder);
    204                if (startIndex > 2) {
    205                    if (css.charAt(startIndex - 3) == '>') {
    206                        preservedTokens.add("");
    207                        css = css.replace(placeholder,  "___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.size() - 1) + "___");
    208                    }
    209                }
    210            }
    211
    212            // in all other cases kill the comment
    213            css = css.replace("/*" + placeholder + "*/", "");
    214        }
    215
    216        // preserve \9 IE hack
    217        final String backslash9 = "\\9";
    218        while (css.indexOf(backslash9) > -1) {
    219            preservedTokens.add(backslash9);
    220            css = css.replace(backslash9,  "___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.size() - 1) + "___");
    221        }
    222
    223        // Normalize all whitespace strings to single spaces. Easier to work with that way.
    224        css = css.replaceAll("\\s+", " ");
    225
    226        // Remove the spaces before the things that should not have spaces before them.
    227        // But, be careful not to turn "p :link {...}" into "p:link{...}"
    228        // Swap out any pseudo-class colons with the token, and then swap back.
    229        sb = new StringBuffer();
    230        p = Pattern.compile("(^|\\})((^|([^\\{:])+):)+([^\\{]*\\{)");
    231        m = p.matcher(css);
    232        while (m.find()) {
    233            String s = m.group();
    234            s = s.replaceAll(":", "___YUICSSMIN_PSEUDOCLASSCOLON___");
    235            s = s.replaceAll( "\\\\", "\\\\\\\\" ).replaceAll( "\\$", "\\\\\\$" );
    236            m.appendReplacement(sb, s);
    237        }
    238        m.appendTail(sb);
    239        css = sb.toString();
    240        // Remove spaces before the things that should not have spaces before them.
    241        css = css.replaceAll("\\s+([!{};:>+\\(\\)\\],])", "$1");
    242        // Restore spaces for !important
    243        css = css.replaceAll("!important", " !important");
    244        // bring back the colon
    245        css = css.replaceAll("___YUICSSMIN_PSEUDOCLASSCOLON___", ":");
    246
    247        // retain space for special IE6 cases
    248        sb = new StringBuffer();
    249        p = Pattern.compile("(?i):first\\-(line|letter)(\\{|,)");
    250        m = p.matcher(css);
    251        while (m.find()) {
    252            m.appendReplacement(sb, ":first-" + m.group(1).toLowerCase() + " " + m.group(2));
    253        }
    254        m.appendTail(sb);
    255        css = sb.toString();
    256
    257        // no space after the end of a preserved comment
    258        css = css.replaceAll("\\*/ ", "*/");
    259
    260        // If there are multiple @charset directives, push them to the top of the file.
    261        sb = new StringBuffer();
    262        p = Pattern.compile("(?i)^(.*)(@charset)( \"[^\"]*\";)");
    263        m = p.matcher(css);
    264        while (m.find()) {
    265            String s = m.group(1).replaceAll("\\\\", "\\\\\\\\").replaceAll("\\$", "\\\\\\$");
    266            m.appendReplacement(sb, m.group(2).toLowerCase() + m.group(3) + s);
    267        }
    268        m.appendTail(sb);
    269        css = sb.toString();
    270
    271        // When all @charset are at the top, remove the second and after (as they are completely ignored).
    272        sb = new StringBuffer();
    273        p = Pattern.compile("(?i)^((\\s*)(@charset)( [^;]+;\\s*))+");
    274        m = p.matcher(css);
    275        while (m.find()) {
    276            m.appendReplacement(sb, m.group(2) + m.group(3).toLowerCase() + m.group(4));
    277        }
    278        m.appendTail(sb);
    279        css = sb.toString();
    280
    281        // lowercase some popular @directives (@charset is done right above)
    282        sb = new StringBuffer();
    283        p = Pattern.compile("(?i)@(font-face|import|(?:-(?:atsc|khtml|moz|ms|o|wap|webkit)-)?keyframe|media|page|namespace)");
    284        m = p.matcher(css);
    285        while (m.find()) {
    286            m.appendReplacement(sb, '@' + m.group(1).toLowerCase());
    287        }
    288        m.appendTail(sb);
    289        css = sb.toString();
    290
    291        // lowercase some more common pseudo-elements
    292        sb = new StringBuffer();
    293        p = Pattern.compile("(?i):(active|after|before|checked|disabled|empty|enabled|first-(?:child|of-type)|focus|hover|last-(?:child|of-type)|link|only-(?:child|of-type)|root|:selection|target|visited)");
    294        m = p.matcher(css);
    295        while (m.find()) {
    296            m.appendReplacement(sb, ':' + m.group(1).toLowerCase());
    297        }
    298        m.appendTail(sb);
    299        css = sb.toString();
    300
    301        // lowercase some more common functions
    302        sb = new StringBuffer();
    303        p = Pattern.compile("(?i):(lang|not|nth-child|nth-last-child|nth-last-of-type|nth-of-type|(?:-(?:moz|webkit)-)?any)\\(");
    304        m = p.matcher(css);
    305        while (m.find()) {
    306            m.appendReplacement(sb, ':' + m.group(1).toLowerCase() + '(');
    307        }
    308        m.appendTail(sb);
    309        css = sb.toString();
    310
    311        // lower case some common function that can be values
    312        // NOTE: rgb() isn't useful as we replace with #hex later, as well as and() is already done for us right after this
    313        sb = new StringBuffer();
    314        p = Pattern.compile("(?i)([:,\\( ]\\s*)(attr|color-stop|from|rgba|to|url|(?:-(?:atsc|khtml|moz|ms|o|wap|webkit)-)?(?:calc|max|min|(?:repeating-)?(?:linear|radial)-gradient)|-webkit-gradient)");
    315        m = p.matcher(css);
    316        while (m.find()) {
    317            m.appendReplacement(sb, m.group(1) + m.group(2).toLowerCase());
    318        }
    319        m.appendTail(sb);
    320        css = sb.toString();
    321
    322        // Put the space back in some cases, to support stuff like
    323        // @media screen and (-webkit-min-device-pixel-ratio:0){
    324        css = css.replaceAll("(?i)\\band\\(", "and (");
    325
    326        // Remove the spaces after the things that should not have spaces after them.
    327        css = css.replaceAll("([!{}:;>+\\(\\[,])\\s+", "$1");
    328
    329        // remove unnecessary semicolons
    330        css = css.replaceAll(";+}", "}");
    331
    332        // Replace 0(px,em,%) with 0.
    333        String oldCss;
    334        p = Pattern.compile("(?i)(^|: ?)((?:[0-9a-z-.]+ )*?)?(?:0?\\.)?0(?:px|em|%|in|cm|mm|pc|pt|ex|deg|g?rad|m?s|k?hz)");
    335        do {
    336          oldCss = css;
    337          m = p.matcher(css);
    338          css = m.replaceAll("$1$20");
    339        } while (!(css.equals(oldCss)));
    340
    341        // Replace 0(px,em,%) with 0 inside groups (e.g. -MOZ-RADIAL-GRADIENT(CENTER 45DEG, CIRCLE CLOSEST-SIDE, ORANGE 0%, RED 100%))
    342        p = Pattern.compile("(?i)\\( ?((?:[0-9a-z-.]+[ ,])*)?(?:0?\\.)?0(?:px|em|%|in|cm|mm|pc|pt|ex|deg|g?rad|m?s|k?hz)");
    343        do {
    344          oldCss = css;
    345          m = p.matcher(css);
    346          css = m.replaceAll("($10");
    347        } while (!(css.equals(oldCss)));
    348
    349        // Replace x.0(px,em,%) with x(px,em,%).
    350        css = css.replaceAll("([0-9])\\.0(px|em|%|in|cm|mm|pc|pt|ex|deg|g?rad|m?s|k?hz| |;)", "$1$2");
    351
    352        // Replace 0 0 0 0; with 0.
    353        css = css.replaceAll(":0 0 0 0(;|})", ":0$1");
    354        css = css.replaceAll(":0 0 0(;|})", ":0$1");
    355        css = css.replaceAll("(?<!flex):0 0(;|})", ":0$1");
    356
    357
    358        // Replace background-position:0; with background-position:0 0;
    359        // same for transform-origin
    360        sb = new StringBuffer();
    361        p = Pattern.compile("(?i)(background-position|webkit-mask-position|transform-origin|webkit-transform-origin|moz-transform-origin|o-transform-origin|ms-transform-origin):0(;|})");
    362        m = p.matcher(css);
    363        while (m.find()) {
    364            m.appendReplacement(sb, m.group(1).toLowerCase() + ":0 0" + m.group(2));
    365        }
    366        m.appendTail(sb);
    367        css = sb.toString();
    368
    369        // Replace 0.6 to .6, but only when preceded by : or a white-space
    370        css = css.replaceAll("(:|\\s)0+\\.(\\d+)", "$1.$2");
    371
    372        // Shorten colors from rgb(51,102,153) to #336699
    373        // This makes it more likely that it'll get further compressed in the next step.
    374        p = Pattern.compile("rgb\\s*\\(\\s*([0-9,\\s]+)\\s*\\)");
    375        m = p.matcher(css);
    376        sb = new StringBuffer();
    377        while (m.find()) {
    378            String[] rgbcolors = m.group(1).split(",");
    379            StringBuffer hexcolor = new StringBuffer("#");
    380            for (i = 0; i < rgbcolors.length; i++) {
    381                int val = Integer.parseInt(rgbcolors[i]);
    382                if (val < 16) {
    383                    hexcolor.append('0');
    384                }
    385
    386                // If someone passes an RGB value that's too big to express in two characters, round down.
    387                // Probably should throw out a warning here, but generating valid CSS is a bigger concern.
    388                if (val > 255) {
    389                    val = 255;
    390                }
    391                hexcolor.append(Integer.toHexString(val));
    392            }
    393            m.appendReplacement(sb, hexcolor.toString());
    394        }
    395        m.appendTail(sb);
    396        css = sb.toString();
    397
    398        // Shorten colors from #AABBCC to #ABC. Note that we want to make sure
    399        // the color is not preceded by either ", " or =. Indeed, the property
    400        //     filter: chroma(color="#FFFFFF");
    401        // would become
    402        //     filter: chroma(color="#FFF");
    403        // which makes the filter break in IE.
    404        // We also want to make sure we're only compressing #AABBCC patterns inside { }, not id selectors ( #FAABAC {} )
    405        // We also want to avoid compressing invalid values (e.g. #AABBCCD to #ABCD)
    406        p = Pattern.compile("(\\=\\s*?[\"']?)?" + "#([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])" + "(:?\\}|[^0-9a-fA-F{][^{]*?\\})");
    407
    408        m = p.matcher(css);
    409        sb = new StringBuffer();
    410        int index = 0;
    411
    412        while (m.find(index)) {
    413
    414            sb.append(css.substring(index, m.start()));
    415
    416            boolean isFilter = (m.group(1) != null && !"".equals(m.group(1)));
    417
    418            if (isFilter) {
    419                // Restore, as is. Compression will break filters
    420                sb.append(m.group(1) + "#" + m.group(2) + m.group(3) + m.group(4) + m.group(5) + m.group(6) + m.group(7));
    421            } else {
    422                if( m.group(2).equalsIgnoreCase(m.group(3)) &&
    423                    m.group(4).equalsIgnoreCase(m.group(5)) &&
    424                    m.group(6).equalsIgnoreCase(m.group(7))) {
    425
    426                    // #AABBCC pattern
    427                    sb.append("#" + (m.group(3) + m.group(5) + m.group(7)).toLowerCase());
    428
    429                } else {
    430
    431                    // Non-compressible color, restore, but lower case.
    432                    sb.append("#" + (m.group(2) + m.group(3) + m.group(4) + m.group(5) + m.group(6) + m.group(7)).toLowerCase());
    433                }
    434            }
    435
    436            index = m.end(7);
    437        }
    438
    439        sb.append(css.substring(index));
    440        css = sb.toString();
    441
    442        // Replace #f00 -> red
    443        css = css.replaceAll("(:|\\s)(#f00)(;|})", "$1red$3");
    444        // Replace other short color keywords
    445        css = css.replaceAll("(:|\\s)(#000080)(;|})", "$1navy$3");
    446        css = css.replaceAll("(:|\\s)(#808080)(;|})", "$1gray$3");
    447        css = css.replaceAll("(:|\\s)(#808000)(;|})", "$1olive$3");
    448        css = css.replaceAll("(:|\\s)(#800080)(;|})", "$1purple$3");
    449        css = css.replaceAll("(:|\\s)(#c0c0c0)(;|})", "$1silver$3");
    450        css = css.replaceAll("(:|\\s)(#008080)(;|})", "$1teal$3");
    451        css = css.replaceAll("(:|\\s)(#ffa500)(;|})", "$1orange$3");
    452        css = css.replaceAll("(:|\\s)(#800000)(;|})", "$1maroon$3");
    453
    454        // border: none -> border:0
    455        sb = new StringBuffer();
    456        p = Pattern.compile("(?i)(border|border-top|border-right|border-bottom|border-left|outline|background):none(;|})");
    457        m = p.matcher(css);
    458        while (m.find()) {
    459            m.appendReplacement(sb, m.group(1).toLowerCase() + ":0" + m.group(2));
    460        }
    461        m.appendTail(sb);
    462        css = sb.toString();
    463
    464        // shorter opacity IE filter
    465        css = css.replaceAll("(?i)progid:DXImageTransform.Microsoft.Alpha\\(Opacity=", "alpha(opacity=");
    466
    467        // Find a fraction that is used for Opera's -o-device-pixel-ratio query
    468        // Add token to add the "\" back in later
    469        css = css.replaceAll("\\(([\\-A-Za-z]+):([0-9]+)\\/([0-9]+)\\)", "($1:$2___YUI_QUERY_FRACTION___$3)");
    470
    471        // Remove empty rules.
    472        css = css.replaceAll("[^\\}\\{/;]+\\{\\}", "");
    473
    474        // Add "\" back to fix Opera -o-device-pixel-ratio query
    475        css = css.replaceAll("___YUI_QUERY_FRACTION___", "/");
    476
    477        // TODO: Should this be after we re-insert tokens. These could alter the break points. However then
    478        // we'd need to make sure we don't break in the middle of a string etc.
    479        if (linebreakpos >= 0) {
    480            // Some source control tools don't like it when files containing lines longer
    481            // than, say 8000 characters, are checked in. The linebreak option is used in
    482            // that case to split long lines after a specific column.
    483            i = 0;
    484            int linestartpos = 0;
    485            sb = new StringBuffer(css);
    486            while (i < sb.length()) {
    487                char c = sb.charAt(i++);
    488                if (c == '}' && i - linestartpos > linebreakpos) {
    489                    sb.insert(i, '\n');
    490                    linestartpos = i;
    491                }
    492            }
    493
    494            css = sb.toString();
    495        }
    496
    497        // Replace multiple semi-colons in a row by a single one
    498        // See SF bug #1980989
    499        css = css.replaceAll(";;+", ";");
    500
    501        // restore preserved comments and strings
    502        for(i = 0, max = preservedTokens.size(); i < max; i++) {
    503            css = css.replace("___YUICSSMIN_PRESERVED_TOKEN_" + i + "___", preservedTokens.get(i).toString());
    504        }
    505
    506        // Add spaces back in between operators for css calc function
    507        // https://developer.mozilla.org/en-US/docs/Web/CSS/calc
    508        // Added by Eric Arnol-Martin (earnolmartin@gmail.com)
    509        sb = new StringBuffer();
    510        p = Pattern.compile("calc\\([^\\)]*\\)");
    511        m = p.matcher(css);
    512        while (m.find()) {
    513            String s = m.group();
    514
    515            s = s.replaceAll("(?<=[-|%|px|em|rem|vw|\\d]+)\\+", " + ");
    516            s = s.replaceAll("(?<=[-|%|px|em|rem|vw|\\d]+)\\-", " - ");
    517            s = s.replaceAll("(?<=[-|%|px|em|rem|vw|\\d]+)\\*", " * ");
    518            s = s.replaceAll("(?<=[-|%|px|em|rem|vw|\\d]+)\\/", " / ");
    519
    520            m.appendReplacement(sb, s);
    521        }
    522        m.appendTail(sb);
    523        css = sb.toString();
    524
    525        // Trim the final string (for any leading or trailing white spaces)
    526        css = css.trim();
    527
    528        // Write the output...
    529        out.write(css);
    530    }
    531}