Java壓縮html

從網上找的一段程式碼，可以壓縮html,不過是java的，等不忙時，把它轉為C#的。

import java.io.StringReader;
import java.io.StringWriter;
import java.util.*;
import java.util.regex.*;

/*******************************************
 * 壓縮jsp,html中的程式碼，去掉所有空白符、換行符
 * @author  bearrui(ak-47)
 * @version 0.1
 * @date     2010-5-13
 *******************************************/
public class HtmlCompressor {
 private static String tempPreBlock = "%%%HTMLCOMPRESS~PRE&&&";
 private static String tempTextAreaBlock = "%%%HTMLCOMPRESS~TEXTAREA&&&";
 private static String tempScriptBlock = "%%%HTMLCOMPRESS~SCRIPT&&&";
 private static String tempStyleBlock = "%%%HTMLCOMPRESS~STYLE&&&";
 private static String tempJspBlock = "%%%HTMLCOMPRESS~JSP&&&";
 
 private static Pattern commentPattern = Pattern.compile("<!--\\s*[^\\[].*?-->", Pattern.DOTALL | Pattern.CASE_INSENSITIVE | Pattern.MULTILINE);
 private static Pattern itsPattern = Pattern.compile(">\\s+?<", Pattern.DOTALL | Pattern.CASE_INSENSITIVE | Pattern.MULTILINE);
 private static Pattern prePattern = Pattern.compile("<pre[^>]*?>.*?</pre>", Pattern.DOTALL | Pattern.CASE_INSENSITIVE | Pattern.MULTILINE);
 private static Pattern taPattern = Pattern.compile("<textarea[^>]*?>.*?</textarea>", Pattern.DOTALL | Pattern.CASE_INSENSITIVE | Pattern.MULTILINE);
 private static Pattern jspPattern = Pattern.compile("<%([^-@][\\w\\W]*?)%>", Pattern.DOTALL | Pattern.CASE_INSENSITIVE | Pattern.MULTILINE);
 // <script></script>
 private static Pattern scriptPattern = Pattern.compile("(?:<script\\s*>|<script type=['\"]text/javascript['\"]\\s*>)(.*?)</script>", Pattern.DOTALL | Pattern.CASE_INSENSITIVE | Pattern.MULTILINE);
 private static Pattern stylePattern = Pattern.compile("<style[^>()]*?>(.+)</style>", Pattern.DOTALL | Pattern.CASE_INSENSITIVE | Pattern.MULTILINE);

 // 單行註釋，
 private static Pattern signleCommentPattern = Pattern.compile("//.*");
 // 字串匹配
 private static Pattern stringPattern = Pattern.compile("(\"[^\"\\n]*?\"|'[^'\\n]*?')");
 // trim去空格和換行符
 private static Pattern trimPattern = Pattern.compile("\\n\\s*",Pattern.MULTILINE);
 private static Pattern trimPattern2 = Pattern.compile("\\s*\\r",Pattern.MULTILINE);
 // 多行註釋
 private static Pattern multiCommentPattern = Pattern.compile("/\\*.*?\\*/", Pattern.DOTALL | Pattern.CASE_INSENSITIVE | Pattern.MULTILINE);

 private static String tempSingleCommentBlock = "%%%HTMLCOMPRESS~SINGLECOMMENT&&&";  // //佔位符
 private static String tempMulitCommentBlock1 = "%%%HTMLCOMPRESS~MULITCOMMENT1&&&";  // /*佔位符
 private static String tempMulitCommentBlock2 = "%%%HTMLCOMPRESS~MULITCOMMENT2&&&";  // */佔位符
 
 
 public static String compress(String html) throws Exception {
  if(html == null || html.length() == 0) {
   return html;
  }
  
  List<String> preBlocks = new ArrayList<String>();
  List<String> taBlocks = new ArrayList<String>();
  List<String> scriptBlocks = new ArrayList<String>();
  List<String> styleBlocks = new ArrayList<String>();
  List<String> jspBlocks = new ArrayList<String>();
  
  String result = html;
  
  //preserve inline java code
  Matcher jspMatcher = jspPattern.matcher(result);
  while(jspMatcher.find()) {
   jspBlocks.add(jspMatcher.group(0));
  }
  result = jspMatcher.replaceAll(tempJspBlock);
  
  //preserve PRE tags
  Matcher preMatcher = prePattern.matcher(result);
  while(preMatcher.find()) {
   preBlocks.add(preMatcher.group(0));
  }
  result = preMatcher.replaceAll(tempPreBlock);
  
  //preserve TEXTAREA tags
  Matcher taMatcher = taPattern.matcher(result);
  while(taMatcher.find()) {
   taBlocks.add(taMatcher.group(0));
  }
  result = taMatcher.replaceAll(tempTextAreaBlock);
  
  //preserve SCRIPT tags
  Matcher scriptMatcher = scriptPattern.matcher(result);
  while(scriptMatcher.find()) {
   scriptBlocks.add(scriptMatcher.group(0));
  }
  result = scriptMatcher.replaceAll(tempScriptBlock);
  
  // don't process inline css
  Matcher styleMatcher = stylePattern.matcher(result);
  while(styleMatcher.find()) {
   styleBlocks.add(styleMatcher.group(0));
  }
  result = styleMatcher.replaceAll(tempStyleBlock);
  
  //process pure html
  result = processHtml(result);
  
  //process preserved blocks
  result = processPreBlocks(result, preBlocks);
  result = processTextareaBlocks(result, taBlocks);
  result = processScriptBlocks(result, scriptBlocks);
  result = processStyleBlocks(result, styleBlocks);
  result = processJspBlocks(result, jspBlocks);
  
  preBlocks = taBlocks = scriptBlocks = styleBlocks = jspBlocks = null;
  
  return result.trim();
 }
 
 private static String processHtml(String html) {
  String result = html;
  
  //remove comments
//  if(removeComments) {
   result = commentPattern.matcher(result).replaceAll("");
//  }
  
  //remove inter-tag spaces
//  if(removeIntertagSpaces) {
   result = itsPattern.matcher(result).replaceAll("><");
//  }
  
  //remove multi whitespace characters
//  if(removeMultiSpaces) {
   result = result.replaceAll("\\s{2,}"," ");
//  }
    
  return result;
 }
 
 private static String processJspBlocks(String html, List<String> blocks){
  String result = html;
  for(int i = 0; i < blocks.size(); i++) {
   blocks.set(i, compressJsp(blocks.get(i)));
  }
  //put preserved blocks back
  while(result.contains(tempJspBlock)) {
   result = result.replaceFirst(tempJspBlock, Matcher.quoteReplacement(blocks.remove(0)));
  }
  
  return result;
 }
 private static String processPreBlocks(String html, List<String> blocks) throws Exception {
  String result = html;
  
  //put preserved blocks back
  while(result.contains(tempPreBlock)) {
   result = result.replaceFirst(tempPreBlock, Matcher.quoteReplacement(blocks.remove(0)));
  }
  
  return result;
 }
 
 private static String processTextareaBlocks(String html, List<String> blocks) throws Exception {
  String result = html;
  
  //put preserved blocks back
  while(result.contains(tempTextAreaBlock)) {
   result = result.replaceFirst(tempTextAreaBlock, Matcher.quoteReplacement(blocks.remove(0)));
  }
  
  return result;
 }
 
 private static String processScriptBlocks(String html, List<String> blocks) throws Exception {
  String result = html;
  
//  if(compressJavaScript) {
   for(int i = 0; i < blocks.size(); i++) {
    blocks.set(i, compressJavaScript(blocks.get(i)));
   }
//  }
  
  //put preserved blocks back
  while(result.contains(tempScriptBlock)) {
   result = result.replaceFirst(tempScriptBlock, Matcher.quoteReplacement(blocks.remove(0)));
  }
  
  return result;
 }
 
 private static String processStyleBlocks(String html, List<String> blocks) throws Exception {
  String result = html;
  
//  if(compressCss) {
   for(int i = 0; i < blocks.size(); i++) {
    blocks.set(i, compressCssStyles(blocks.get(i)));
   }
//  }
  
  //put preserved blocks back
  while(result.contains(tempStyleBlock)) {
   result = result.replaceFirst(tempStyleBlock, Matcher.quoteReplacement(blocks.remove(0)));
  }
  
  return result;
 }
 
 private static String compressJsp(String source)  {
  //check if block is not empty
  Matcher jspMatcher = jspPattern.matcher(source);
  if(jspMatcher.find()) {
   String result = compressJspJs(jspMatcher.group(1));
   return (new StringBuilder(source.substring(0, jspMatcher.start(1))).append(result).append(source.substring(jspMatcher.end(1)))).toString();
  } else {
   return source;
  }
 } 
 private static String compressJavaScript(String source)  {
  //check if block is not empty
  Matcher scriptMatcher = scriptPattern.matcher(source);
  if(scriptMatcher.find()) {
   String result = compressJspJs(scriptMatcher.group(1));
   return (new StringBuilder(source.substring(0, scriptMatcher.start(1))).append(result).append(source.substring(scriptMatcher.end(1)))).toString();
  } else {
   return source;
  }
 }
  
 private static String compressCssStyles(String source)  {
  //check if block is not empty
  Matcher styleMatcher = stylePattern.matcher(source);
  if(styleMatcher.find()) {
   // 去掉註釋，換行
   String result= multiCommentPattern.matcher(styleMatcher.group(1)).replaceAll("");
   result = trimPattern.matcher(result).replaceAll("");
   result = trimPattern2.matcher(result).replaceAll("");
   return (new StringBuilder(source.substring(0, styleMatcher.start(1))).append(result).append(source.substring(styleMatcher.end(1)))).toString();
  } else {
   return source;
  }
 }
 
 private static String compressJspJs(String source){
  String result = source;
  // 因註釋符合有可能出現在字串中，所以要先把字串中的特殊符好去掉
  Matcher stringMatcher = stringPattern.matcher(result);
  while(stringMatcher.find()){
   String tmpStr = stringMatcher.group(0);
   
   if(tmpStr.indexOf("//") != -1 || tmpStr.indexOf("/*") != -1 || tmpStr.indexOf("*/") != -1){
    String blockStr = tmpStr.replaceAll("//", tempSingleCommentBlock).replaceAll("/\\*", tempMulitCommentBlock1)
        .replaceAll("\\*/", tempMulitCommentBlock2);
    result = result.replace(tmpStr, blockStr);
   }
  }
  // 去掉註釋
  result = signleCommentPattern.matcher(result).replaceAll("");
  result = multiCommentPattern.matcher(result).replaceAll("");
  result = trimPattern2.matcher(result).replaceAll("");
  result = trimPattern.matcher(result).replaceAll(" ");
  // 恢復替換掉的字串
  result = result.replaceAll(tempSingleCommentBlock, "//").replaceAll(tempMulitCommentBlock1, "/*")
    .replaceAll(tempMulitCommentBlock2, "*/");
  
  return result;
 }
}