/*
?*?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（）;