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382 lines
14 KiB
382 lines
14 KiB
/*
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* YUI Compressor
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* http://developer.yahoo.com/yui/compressor/
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* Author: Julien Lecomte - http://www.julienlecomte.net/
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* Author: Isaac Schlueter - http://foohack.com/
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* Author: Stoyan Stefanov - http://phpied.com/
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* Copyright (c) 2011 Yahoo! Inc. All rights reserved.
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* The copyrights embodied in the content of this file are licensed
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* by Yahoo! Inc. under the BSD (revised) open source license.
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*/
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package com.yahoo.platform.yui.compressor;
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import java.io.IOException;
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import java.io.Reader;
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import java.io.Writer;
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import java.util.regex.Pattern;
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import java.util.regex.Matcher;
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import java.util.ArrayList;
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public class CssCompressor {
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private StringBuffer srcsb = new StringBuffer();
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public CssCompressor(Reader in) throws IOException {
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// Read the stream...
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int c;
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while ((c = in.read()) != -1) {
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srcsb.append((char) c);
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}
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}
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// Leave data urls alone to increase parse performance.
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protected String extractDataUrls(String css, ArrayList preservedTokens) {
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int maxIndex = css.length() - 1;
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int appendIndex = 0;
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StringBuffer sb = new StringBuffer();
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Pattern p = Pattern.compile("url\\(\\s*([\"']?)data\\:");
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Matcher m = p.matcher(css);
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/*
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* Since we need to account for non-base64 data urls, we need to handle
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* ' and ) being part of the data string. Hence switching to indexOf,
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* to determine whether or not we have matching string terminators and
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* handling sb appends directly, instead of using matcher.append* methods.
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*/
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while (m.find()) {
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int startIndex = m.start() + 4; // "url(".length()
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String terminator = m.group(1); // ', " or empty (not quoted)
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if (terminator.length() == 0) {
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terminator = ")";
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}
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boolean foundTerminator = false;
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int endIndex = m.end() - 1;
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while(foundTerminator == false && endIndex+1 <= maxIndex) {
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endIndex = css.indexOf(terminator, endIndex+1);
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if ((endIndex > 0) && (css.charAt(endIndex-1) != '\\')) {
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foundTerminator = true;
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if (!")".equals(terminator)) {
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endIndex = css.indexOf(")", endIndex);
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}
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}
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}
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// Enough searching, start moving stuff over to the buffer
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sb.append(css.substring(appendIndex, m.start()));
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if (foundTerminator) {
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String token = css.substring(startIndex, endIndex);
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token = token.replaceAll("\\s+", "");
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preservedTokens.add(token);
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String preserver = "url(___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.size() - 1) + "___)";
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sb.append(preserver);
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appendIndex = endIndex + 1;
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} else {
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// No end terminator found, re-add the whole match. Should we throw/warn here?
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sb.append(css.substring(m.start(), m.end()));
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appendIndex = m.end();
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}
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}
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sb.append(css.substring(appendIndex));
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return sb.toString();
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}
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public void compress(Writer out, int linebreakpos)
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throws IOException {
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Pattern p;
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Matcher m;
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String css = srcsb.toString();
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int startIndex = 0;
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int endIndex = 0;
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int i = 0;
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int max = 0;
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ArrayList preservedTokens = new ArrayList(0);
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ArrayList comments = new ArrayList(0);
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String token;
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int totallen = css.length();
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String placeholder;
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css = this.extractDataUrls(css, preservedTokens);
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StringBuffer sb = new StringBuffer(css);
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// collect all comment blocks...
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while ((startIndex = sb.indexOf("/*", startIndex)) >= 0) {
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endIndex = sb.indexOf("*/", startIndex + 2);
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if (endIndex < 0) {
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endIndex = totallen;
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}
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token = sb.substring(startIndex + 2, endIndex);
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comments.add(token);
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sb.replace(startIndex + 2, endIndex, "___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_" + (comments.size() - 1) + "___");
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startIndex += 2;
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}
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css = sb.toString();
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// preserve strings so their content doesn't get accidentally minified
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sb = new StringBuffer();
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p = Pattern.compile("(\"([^\\\\\"]|\\\\.|\\\\)*\")|(\'([^\\\\\']|\\\\.|\\\\)*\')");
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m = p.matcher(css);
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while (m.find()) {
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token = m.group();
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char quote = token.charAt(0);
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token = token.substring(1, token.length() - 1);
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// maybe the string contains a comment-like substring?
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// one, maybe more? put'em back then
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if (token.indexOf("___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_") >= 0) {
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for (i = 0, max = comments.size(); i < max; i += 1) {
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token = token.replace("___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_" + i + "___", comments.get(i).toString());
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}
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}
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// minify alpha opacity in filter strings
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token = token.replaceAll("(?i)progid:DXImageTransform.Microsoft.Alpha\\(Opacity=", "alpha(opacity=");
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preservedTokens.add(token);
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String preserver = quote + "___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.size() - 1) + "___" + quote;
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m.appendReplacement(sb, preserver);
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}
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m.appendTail(sb);
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css = sb.toString();
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// strings are safe, now wrestle the comments
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for (i = 0, max = comments.size(); i < max; i += 1) {
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token = comments.get(i).toString();
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placeholder = "___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_" + i + "___";
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// ! in the first position of the comment means preserve
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// so push to the preserved tokens while stripping the !
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if (token.startsWith("!")) {
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preservedTokens.add(token);
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css = css.replace(placeholder, "___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.size() - 1) + "___");
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continue;
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}
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// \ in the last position looks like hack for Mac/IE5
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// shorten that to /*\*/ and the next one to /**/
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if (token.endsWith("\\")) {
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preservedTokens.add("\\");
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css = css.replace(placeholder, "___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.size() - 1) + "___");
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i = i + 1; // attn: advancing the loop
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preservedTokens.add("");
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css = css.replace("___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_" + i + "___", "___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.size() - 1) + "___");
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continue;
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}
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// keep empty comments after child selectors (IE7 hack)
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// e.g. html >/**/ body
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if (token.length() == 0) {
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startIndex = css.indexOf(placeholder);
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if (startIndex > 2) {
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if (css.charAt(startIndex - 3) == '>') {
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preservedTokens.add("");
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css = css.replace(placeholder, "___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.size() - 1) + "___");
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}
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}
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}
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// in all other cases kill the comment
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css = css.replace("/*" + placeholder + "*/", "");
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}
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// Normalize all whitespace strings to single spaces. Easier to work with that way.
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css = css.replaceAll("\\s+", " ");
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// Remove the spaces before the things that should not have spaces before them.
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// But, be careful not to turn "p :link {...}" into "p:link{...}"
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// Swap out any pseudo-class colons with the token, and then swap back.
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sb = new StringBuffer();
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p = Pattern.compile("(^|\\})(([^\\{:])+:)+([^\\{]*\\{)");
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m = p.matcher(css);
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while (m.find()) {
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String s = m.group();
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s = s.replaceAll(":", "___YUICSSMIN_PSEUDOCLASSCOLON___");
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s = s.replaceAll( "\\\\", "\\\\\\\\" ).replaceAll( "\\$", "\\\\\\$" );
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m.appendReplacement(sb, s);
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}
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m.appendTail(sb);
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css = sb.toString();
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// Remove spaces before the things that should not have spaces before them.
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css = css.replaceAll("\\s+([!{};:>+\\(\\)\\],])", "$1");
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// bring back the colon
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css = css.replaceAll("___YUICSSMIN_PSEUDOCLASSCOLON___", ":");
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// retain space for special IE6 cases
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css = css.replaceAll(":first\\-(line|letter)(\\{|,)", ":first-$1 $2");
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// no space after the end of a preserved comment
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css = css.replaceAll("\\*/ ", "*/");
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// If there is a @charset, then only allow one, and push to the top of the file.
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css = css.replaceAll("^(.*)(@charset \"[^\"]*\";)", "$2$1");
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css = css.replaceAll("^(\\s*@charset [^;]+;\\s*)+", "$1");
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// Put the space back in some cases, to support stuff like
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// @media screen and (-webkit-min-device-pixel-ratio:0){
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css = css.replaceAll("\\band\\(", "and (");
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// Remove the spaces after the things that should not have spaces after them.
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css = css.replaceAll("([!{}:;>+\\(\\[,])\\s+", "$1");
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// remove unnecessary semicolons
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css = css.replaceAll(";+}", "}");
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// Replace 0(px,em,%) with 0.
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css = css.replaceAll("([\\s:])(0)(px|em|%|in|cm|mm|pc|pt|ex)", "$1$2");
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// Replace 0 0 0 0; with 0.
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css = css.replaceAll(":0 0 0 0(;|})", ":0$1");
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css = css.replaceAll(":0 0 0(;|})", ":0$1");
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css = css.replaceAll(":0 0(;|})", ":0$1");
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// Replace background-position:0; with background-position:0 0;
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// same for transform-origin
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sb = new StringBuffer();
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p = Pattern.compile("(?i)(background-position|transform-origin|webkit-transform-origin|moz-transform-origin|o-transform-origin|ms-transform-origin):0(;|})");
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m = p.matcher(css);
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while (m.find()) {
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m.appendReplacement(sb, m.group(1).toLowerCase() + ":0 0" + m.group(2));
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}
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m.appendTail(sb);
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css = sb.toString();
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// Replace 0.6 to .6, but only when preceded by : or a white-space
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css = css.replaceAll("(:|\\s)0+\\.(\\d+)", "$1.$2");
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// Shorten colors from rgb(51,102,153) to #336699
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// This makes it more likely that it'll get further compressed in the next step.
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p = Pattern.compile("rgb\\s*\\(\\s*([0-9,\\s]+)\\s*\\)");
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m = p.matcher(css);
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sb = new StringBuffer();
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while (m.find()) {
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String[] rgbcolors = m.group(1).split(",");
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StringBuffer hexcolor = new StringBuffer("#");
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for (i = 0; i < rgbcolors.length; i++) {
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int val = Integer.parseInt(rgbcolors[i]);
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if (val < 16) {
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hexcolor.append("0");
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}
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hexcolor.append(Integer.toHexString(val));
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}
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m.appendReplacement(sb, hexcolor.toString());
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}
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m.appendTail(sb);
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css = sb.toString();
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// Shorten colors from #AABBCC to #ABC. Note that we want to make sure
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// the color is not preceded by either ", " or =. Indeed, the property
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// filter: chroma(color="#FFFFFF");
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// would become
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// filter: chroma(color="#FFF");
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// which makes the filter break in IE.
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// We also want to make sure we're only compressing #AABBCC patterns inside { }, not id selectors ( #FAABAC {} )
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// We also want to avoid compressing invalid values (e.g. #AABBCCD to #ABCD)
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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{][^{]*?\\})");
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m = p.matcher(css);
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sb = new StringBuffer();
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int index = 0;
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while (m.find(index)) {
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sb.append(css.substring(index, m.start()));
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boolean isFilter = (m.group(1) != null && !"".equals(m.group(1)));
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if (isFilter) {
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// Restore, as is. Compression will break filters
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sb.append(m.group(1) + "#" + m.group(2) + m.group(3) + m.group(4) + m.group(5) + m.group(6) + m.group(7));
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} else {
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if( m.group(2).equalsIgnoreCase(m.group(3)) &&
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m.group(4).equalsIgnoreCase(m.group(5)) &&
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m.group(6).equalsIgnoreCase(m.group(7))) {
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// #AABBCC pattern
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sb.append("#" + (m.group(3) + m.group(5) + m.group(7)).toLowerCase());
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} else {
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// Non-compressible color, restore, but lower case.
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sb.append("#" + (m.group(2) + m.group(3) + m.group(4) + m.group(5) + m.group(6) + m.group(7)).toLowerCase());
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}
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}
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index = m.end(7);
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}
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sb.append(css.substring(index));
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css = sb.toString();
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// border: none -> border:0
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sb = new StringBuffer();
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p = Pattern.compile("(?i)(border|border-top|border-right|border-bottom|border-right|outline|background):none(;|})");
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m = p.matcher(css);
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while (m.find()) {
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m.appendReplacement(sb, m.group(1).toLowerCase() + ":0" + m.group(2));
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}
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m.appendTail(sb);
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css = sb.toString();
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// shorter opacity IE filter
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css = css.replaceAll("(?i)progid:DXImageTransform.Microsoft.Alpha\\(Opacity=", "alpha(opacity=");
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// Remove empty rules.
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css = css.replaceAll("[^\\}\\{/;]+\\{\\}", "");
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// TODO: Should this be after we re-insert tokens. These could alter the break points. However then
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// we'd need to make sure we don't break in the middle of a string etc.
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if (linebreakpos >= 0) {
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// Some source control tools don't like it when files containing lines longer
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// than, say 8000 characters, are checked in. The linebreak option is used in
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// that case to split long lines after a specific column.
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i = 0;
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int linestartpos = 0;
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sb = new StringBuffer(css);
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while (i < sb.length()) {
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char c = sb.charAt(i++);
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if (c == '}' && i - linestartpos > linebreakpos) {
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sb.insert(i, '\n');
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linestartpos = i;
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}
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}
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css = sb.toString();
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}
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// Replace multiple semi-colons in a row by a single one
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// See SF bug #1980989
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css = css.replaceAll(";;+", ";");
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// restore preserved comments and strings
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for(i = 0, max = preservedTokens.size(); i < max; i++) {
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css = css.replace("___YUICSSMIN_PRESERVED_TOKEN_" + i + "___", preservedTokens.get(i).toString());
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}
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// Trim the final string (for any leading or trailing white spaces)
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css = css.trim();
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// Write the output...
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out.write(css);
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}
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}
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