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/* * YUI Compressor * http://developer.yahoo.com/yui/compressor/ * Author: Julien Lecomte - http://www.julienlecomte.net/ * Author: Isaac Schlueter - http://foohack.com/ * Author: Stoyan Stefanov - http://phpied.com/ * Copyright (c) 2011 Yahoo! Inc. All rights reserved. * The copyrights embodied in the content of this file are licensed * by Yahoo! Inc. under the BSD (revised) open source license. */ package com.yahoo.platform.yui.compressor; import java.io.IOException; import java.io.Reader; import java.io.Writer; import java.util.regex.Pattern; import java.util.regex.Matcher; import java.util.ArrayList; public class CssCompressor { private StringBuffer srcsb = new StringBuffer(); public CssCompressor(Reader in) throws IOException { // Read the stream... int c; while ((c = in.read()) != -1) { srcsb.append((char) c); } } // Leave data urls alone to increase parse performance. protected String extractDataUrls(String css, ArrayList preservedTokens) { int maxIndex = css.length() - 1; int appendIndex = 0; StringBuffer sb = new StringBuffer(); Pattern p = Pattern.compile("url\\(\\s*([\"']?)data\\:"); Matcher m = p.matcher(css); /* * Since we need to account for non-base64 data urls, we need to handle * ' and ) being part of the data string. Hence switching to indexOf, * to determine whether or not we have matching string terminators and * handling sb appends directly, instead of using matcher.append* methods. */ while (m.find()) { int startIndex = m.start() + 4; // "url(".length() String terminator = m.group(1); // ', " or empty (not quoted) if (terminator.length() == 0) { terminator = ")"; } boolean foundTerminator = false; int endIndex = m.end() - 1; while(foundTerminator == false && endIndex+1 <= maxIndex) { endIndex = css.indexOf(terminator, endIndex+1); if ((endIndex > 0) && (css.charAt(endIndex-1) != '\\')) { foundTerminator = true; if (!")".equals(terminator)) { endIndex = css.indexOf(")", endIndex); } } } // Enough searching, start moving stuff over to the buffer sb.append(css.substring(appendIndex, m.start())); if (foundTerminator) { String token = css.substring(startIndex, endIndex); token = token.replaceAll("\\s+", ""); preservedTokens.add(token); String preserver = "url(___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.size() - 1) + "___)"; sb.append(preserver); appendIndex = endIndex + 1; } else { // No end terminator found, re-add the whole match. Should we throw/warn here? sb.append(css.substring(m.start(), m.end())); appendIndex = m.end(); } } sb.append(css.substring(appendIndex)); return sb.toString(); } public void compress(Writer out, int linebreakpos) throws IOException { Pattern p; Matcher m; String css = srcsb.toString(); int startIndex = 0; int endIndex = 0; int i = 0; int max = 0; ArrayList preservedTokens = new ArrayList(0); ArrayList comments = new ArrayList(0); String token; int totallen = css.length(); String placeholder; css = this.extractDataUrls(css, preservedTokens); StringBuffer sb = new StringBuffer(css); // collect all comment blocks... while ((startIndex = sb.indexOf("/*", startIndex)) >= 0) { endIndex = sb.indexOf("*/", startIndex + 2); if (endIndex < 0) { endIndex = totallen; } token = sb.substring(startIndex + 2, endIndex); comments.add(token); sb.replace(startIndex + 2, endIndex, "___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_" + (comments.size() - 1) + "___"); startIndex += 2; } css = sb.toString(); // preserve strings so their content doesn't get accidentally minified sb = new StringBuffer(); p = Pattern.compile("(\"([^\\\\\"]|\\\\.|\\\\)*\")|(\'([^\\\\\']|\\\\.|\\\\)*\')"); m = p.matcher(css); while (m.find()) { token = m.group(); char quote = token.charAt(0); token = token.substring(1, token.length() - 1); // maybe the string contains a comment-like substring? // one, maybe more? put'em back then if (token.indexOf("___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_") >= 0) { for (i = 0, max = comments.size(); i < max; i += 1) { token = token.replace("___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_" + i + "___", comments.get(i).toString()); } } // minify alpha opacity in filter strings token = token.replaceAll("(?i)progid:DXImageTransform.Microsoft.Alpha\\(Opacity=", "alpha(opacity="); preservedTokens.add(token); String preserver = quote + "___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.size() - 1) + "___" + quote; m.appendReplacement(sb, preserver); } m.appendTail(sb); css = sb.toString(); // strings are safe, now wrestle the comments for (i = 0, max = comments.size(); i < max; i += 1) { token = comments.get(i).toString(); placeholder = "___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_" + i + "___"; // ! in the first position of the comment means preserve // so push to the preserved tokens while stripping the ! if (token.startsWith("!")) { preservedTokens.add(token); css = css.replace(placeholder, "___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.size() - 1) + "___"); continue; } // \ in the last position looks like hack for Mac/IE5 // shorten that to /*\*/ and the next one to /**/ if (token.endsWith("\\")) { preservedTokens.add("\\"); css = css.replace(placeholder, "___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.size() - 1) + "___"); i = i + 1; // attn: advancing the loop preservedTokens.add(""); css = css.replace("___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_" + i + "___", "___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.size() - 1) + "___"); continue; } // keep empty comments after child selectors (IE7 hack) // e.g. html >/**/ body if (token.length() == 0) { startIndex = css.indexOf(placeholder); if (startIndex > 2) { if (css.charAt(startIndex - 3) == '>') { preservedTokens.add(""); css = css.replace(placeholder, "___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.size() - 1) + "___"); } } } // in all other cases kill the comment css = css.replace("/*" + placeholder + "*/", ""); } // Normalize all whitespace strings to single spaces. Easier to work with that way. css = css.replaceAll("\\s+", " "); // Remove the spaces before the things that should not have spaces before them. // But, be careful not to turn "p :link {...}" into "p:link{...}" // Swap out any pseudo-class colons with the token, and then swap back. sb = new StringBuffer(); p = Pattern.compile("(^|\\})(([^\\{:])+:)+([^\\{]*\\{)"); m = p.matcher(css); while (m.find()) { String s = m.group(); s = s.replaceAll(":", "___YUICSSMIN_PSEUDOCLASSCOLON___"); s = s.replaceAll( "\\\\", "\\\\\\\\" ).replaceAll( "\\$", "\\\\\