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CodeSimplifier

阅读更多

 

 看开源项目源代码或者看项目源码的时候,常常觉得代码看起来比较啰嗦,总觉得有些的应该可以简化的。

 

比如:

 

1 过多的getter、setter 这些显然是没技术含量的,但是它夹杂在类的其他代码中,影响了阅读。我的做法是把去掉其getter、setter,然后它直接改为public 变量。——虽然这有违java封装原则,但是我想这却是有利于代码阅读的。。

 

 

2 过多的注释,一些开源项目往往就是大版大版的注释,注释多是好是坏姑且不论,但是有时候我们只是想看源码,不想看注释,这个时候它就非常讨嫌了!

 

 

3 过多的try catch 等异常扑捉。 这显然也是影响阅读的,试想,如果关键代码就那么一行一个方法20个字符之内,外面却包了3、4个try catch,多烦人啊,最后还有finally。。。 当然,如果想详细了解源码,彻底弄明白其功能,仔细阅读try catch是有必要的,但有时候,我们只想快速的、大致的阅读一下源码,这个时候也有必要简化一下那个类了。

 

4 日志,一般来说,日志只是处理调试信息、警告信息、异常信息等用的, 去掉它并不影响功能

 

5 注解 有些annotation并不是必须的,去掉完全不影响阅读,比如:@Override、@SuppressWarnings..等

众所周知,看源码并不是一件简单的事,因为,我们常常没有那个对应的UML图,功能说明啊等。(不知道为什么都这样。。。)

 

 

要是能简化代码,那么再来阅读就会轻松多了!本想这么个简单的功能,别人应该已经做出来了的。可是,我网上搜索却总也找不到。——难道大家都没有这方面的考虑吗??

 

困扰了我很久,今天有点时间,想起这事,于是自己写了一个简单实现:

 

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Stack;
import java.util.logging.Logger;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import com.luobk.po.VarObject;



/**
 * 代码阅读优化器 CodeSimplifier或者也可以称为 CodePurifier吧
 * goSimplifyProject 只针对 目录
 * 若是 想直接的simplify一个java文件,则用simplifyFile即可
 * 
 */
public class CodeSimplifier {


//	public static String SOURCE_DIR = "D:\\WS\ABC\\src";
	public static String SOURCE_DIR = "D:\\WS\\CodeSimplifier\\src";
	public static String DEST_DIR = "D:\\WS\\CodeSimplifier\\src3";
	public static String SOURCE_FOLDER = "src";
	public static String LOGGER_NAME = "log";
	public static boolean USE_SOURCE_FOLDER = false;
	
	/**
	 * 
	 * @param args
	 * @throws IOException 
	 */
	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		
		goSimplifyProject(SOURCE_DIR,DEST_DIR);
		
//		simplifyFile(new File(SOURCE_DIR), DEST_DIR);
		
//		System.out.println("sfasf".matches("[.]+"));
//		System.out.println("asf " +
//				"a\" f艾丝凡 	f\nasf\nnnbbsa;\"aa".matches("a\"(.|\\s)*;\"aa"));
//		System.out.println("\n".matches("(\\s+)"));
//		System.out.println("sfasf".matches(".*asf")); // .+  。* 是可以自动伸缩的 , 默认的 。。。  非贪婪模式?? 
//		String ss = "System.out. println(\"sfas 	r asfa fas \");\n" +
//				"System.out. println(\"sfas + \n  asfa fas \");";
//		System.out.println("ss .  replaceAll : "+ss.
//				replaceAll("\\s+System\\s*\\.\\s*out\\s*\\.\\s*print(ln)?\\s*\\(\\s*\"(.|\\s)*\"\\s*\\)\\s*;",""));
		
//		StringBuffer sb = new StringBuffer("abcdef\nxyz\n>");
//		sb.deleteCharAt(sb.length()-1);
//		System.out.println("matches++ =  "+"sfaaf".matches(".{6}"));// + 后面的 {n} 失效
//		System.out.println("matches++ =  "+"fasf \n}".matches(".+")); // 匹配任何字符包括' ',但是不包括 \n等
//		System.out.println("sfaf>s]f[s.".replaceAll("]","A"));//  到底要不要转义 [] 啊!!
//		sb.reverse 有用的方法!是String 没有提供的!
//		String filePath =  "D:\\iEMPWorkspaces\\CodePurifier\\src\\po\\";
//		String projectPath = "D:\\iEMPWorkspaces\\CodePurifier\\src2\\Bootstrap.java";
//		String destDir = "D:\\iEMPWorkspaces\\CodePurifier\\src3\\";
		
//		System.out.println("ddasfasf aa\n =  asf   qwf".replaceAll("\\s{2}", "X"));
//		System.out.println("ddasfasf aa\n =  2asf   qwf".replaceAll("\\s[2]", "X"));
//		System.out.println(capitalize("asfaf"));
		
//		File f = new File("D:\\iEMPWorkspaces\\CodePurifier\\src2\\sdaf.java");
//		f.mkdir();
//		FileOutputStream fos = new FileOutputStream(f);
//		BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(fos));
//		bw.write(destDir);// if we don't write sth , the file will never be created,just in mem.
//		bw.close();
//		System.out.println("f.length()=="+f.length()+" f.exists();===+"+f.exists());
//		System.out.println(" is DIR == "+ f.getCanonicalPath()+"\\"+f.getName());
		
	}

	public static void goSimplifyProject(String projectPath,String destprojectPath) throws IOException {

		File destProjectDir = new File(destprojectPath);
		if(!destProjectDir.exists())destProjectDir.mkdir();
		
		if(!projectPath.endsWith("\\")) projectPath = projectPath + "\\";
		if(!destprojectPath.endsWith("\\")) destprojectPath = destprojectPath + "\\";
		
		File sourceDir = null;
		if(USE_SOURCE_FOLDER)sourceDir = new File(projectPath+SOURCE_FOLDER+"\\");
		else sourceDir = new File(projectPath);
		simplifyProject(sourceDir,destprojectPath,true);
	}

	public static void simplifyProject(File fileOrDir,String destDir,boolean isRoot) throws IOException {
		if(fileOrDir.isDirectory()) {
			/**	此种过滤行不通!
			FilenameFilter filter = new FilenameFilter() {
				private String type = ".java";
				@Override
				public boolean accept(File dir, String name) {
					//return true;
					return name.endsWith(type);
				}
			};*/
			File[] files = fileOrDir.listFiles();
			
			
			for (int i = 0; i < files.length; i++) {
				File file = files[i];
				if(isRoot) {
					if(USE_SOURCE_FOLDER)destDir = destDir+SOURCE_FOLDER+"\\";
					File destRootDir = new File(destDir);
					if(!destRootDir.exists())destRootDir.mkdir();
					simplifyProject(file,destDir,false);
				}else {
					// Build the new directory,othewise we'll got: 
					//"java.io.FileNotFoundException: D:\iEMPWorkspaces\CodePurifier\src2\po\Sdfa.java (系统找不到指定的路径。)"
					//System.out.println("lastDir=="+lastDir);
					String lastDir = fileOrDir.getName();
					File directory = new File(destDir+lastDir);
					if(!directory.exists())directory.mkdir();
					
					simplifyProject(file,destDir+lastDir+"\\",false);
				}
			}
			
		}else if(fileOrDir.isFile()){
			if(fileOrDir.getName().endsWith(".java"))simplifyFile(fileOrDir,destDir);
		}
	}
	
	/**
	 * 
	 * FOR JAVA FILE ONLY CURRENTLY
	 * 
	 * REMOVE THE COMMENTS AND THE GETTER/SETTER, AND CHANGE THE MODIFIRE OF RALATED ONE TO 'PUBLIC'
	 * 
	 * ASSUME THAT THE GETTER/SETTER USES PARAMETER AS THE SAME NAME OF THE VARAIBLE 
	 * 
	 * THATS ALL
	 * 
	 * @param file
	 * @throws IOException
	 */
	@SuppressWarnings({ "unchecked", "rawtypes" })
	public static void simplifyFile(File file,String destDir) throws IOException {
		
		FileInputStream fis = new FileInputStream(file);
		
		System.out.println(file.getAbsolutePath());
		
		String outputFile = destDir+file.getName();
		//System.out.println("output FIle Path"+outputFile);
		
		FileOutputStream fos = new FileOutputStream(new File(outputFile));// assume the outputFile is not the input one
		
		BufferedReader br = new BufferedReader(new InputStreamReader(fis));
		BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(fos));
		
		boolean isComments = false;
		boolean isEmptyRow = false;
		String line = "";
		String oline = "";
		List privateVars = new ArrayList();
		StringBuffer sb = new StringBuffer();
		
		while((line=br.readLine())!=null) {
			oline = line;
			line = line.trim().replaceAll("\\s+", " ");

			// white line
			if("".equals(line)) {
				continue;
			}
			
			// 去掉注释
			//if(isComments&&!(line.endsWith("*/"))&&!line.endsWith("*/ "))continue;
			
			//TODO 暂不考虑 行中/*前面还有代码的情况
			
			// 眼考虑 /* */在同一行的情况,—— 如果*/后面还有内容,则不管了 !
			if(line.startsWith("/*")&&(line.endsWith("*/")||line.endsWith("*/ "))) {
				continue;
			}
			if(line.startsWith("/*")) {
				isComments = true;
				continue;
			}
			if(isComments&&!line.endsWith("*/")&&!line.endsWith("*/ "))  {//line.startsWith("*")&&
				//ifComments = true;
				continue;
			}
			
			//TODO 暂不考虑 行中*/后面还有代码的情况
			if(line.endsWith("*/")||line.endsWith("*/ ")) {
				//System.out.println("line : "+line);
				isComments = false;
				continue;
			}

			if(line.startsWith("//")) {
				continue;
			}
			
			String[] strs = line.replace(';', ' ').trim().split(" ");
			if(line.startsWith("private ") &&strs.length==3 && line.endsWith(";")) {
				//line = line.replaceFirst("private", "public");
				//oline = oline.replaceFirst("private", "public");
				VarObject vo = new VarObject();
				vo.setVar(strs[2]);
				vo.setType(strs[1]);
				privateVars.add(vo);
			}
			
			String regex = "\\s*[\\}\\)\\]>]\\s*";
			if(oline.matches(regex)) {
				if(isEmptyRow) {
					sb.deleteCharAt(sb.length()-1);
					sb.append(line+"\n");
				}
				else sb.append(oline+"\n"); 
				isEmptyRow = true;
			}else {
				isEmptyRow = false;
				sb.append(oline+"\n");
			}
		}
		br.close();
		
		String ret = sb.toString();
		System.out.println("Before:\n" + ret);
		//ret = ret.replaceAll("\\) ",")").replaceAll("\\s?\\(\\s+\\)\\s?", "()");//.replaceAll("\n", "");
		
		ret = filterGetterSetters(ret, privateVars);
		ret = filterLogs(ret);
		ret = filterAnnotations(ret);
		ret = filterTryCatchs(ret);
		
		bw.write(ret);
		bw.close();
		
		System.out.println("After:\n" + ret);
	}
	
	// 无止境的 CLRF 空字符。。。 \\s*	繁琐。。。
	private static String filterAnnotations(String str) {
		String regex = "((@\\s*Override)|(@\\s*SuppressWarnings\\s*\\(.*\\)))\\s*";
		str = str.replaceAll(regex, "");
		return str;
	}

	private static String filterGetterSetters(String str,List privateVars) {
		for (Iterator iterator = privateVars.iterator(); iterator.hasNext();) {
			VarObject vo = (VarObject) iterator.next();
			String getterRegEx = "\\s+public\\s+"+vo.getType()+"\\s+get"+capitalize(vo.getVar())+"\\s*\\(\\s*\\)\\s*\\{\\s*return\\s+"+vo.getVar()+"\\s*;\\s*\\}";
			String setterRegEx = "\\s+public\\s+void\\s+set"+capitalize(vo.getVar())+"\\(\\s*"
					+vo.getType()+"\\s+\\w+\\s*\\)\\s*\\{\\s*(this\\.)?"+vo.getVar()+"\\s*=\\s*\\w+;\\s*\\}";
			Matcher mgetter = Pattern.compile(setterRegEx).matcher(str);
			Matcher msetter = Pattern.compile(getterRegEx).matcher(str);
			if(mgetter.find() && msetter.find()){
				str = mgetter.replaceAll("");
				str = msetter.replaceAll("");
				str = str.replaceFirst("private\\s+"+vo.getType()+"\\s+"+vo.getVar(), "public "+vo.getType()+" "+vo.getVar());
				//oline = oline.replaceFirst("private", "public");
			}
			
		}
		return str;
	}
	
	//  TODO 要考虑 log 里面内容换行的情况 。
	//  TODO 要考虑 System.out.println 里面内容换行的情况 ,但是 如果 是 System.\n out\n .println的情况就不管了,实在太繁琐。。。。。 
	private static String filterLogs(String str) {
		String regexLog = "\\s+((private)|(public))\\s+.+log\\s+=\\s+Logger\\.getLogger.+;";
		String regex = LOGGER_NAME+"\\s*\\.\\s*((debug)|(warn)|(error)|(fatal)|(finest)|(finer)|(fine)|(warning)|(severe))\\s*\\(\\s*\".*\"\\s*\\)\\s*;\\s*";
		//String regex = "log\\s*\\.\\s*[(fine)|(severe)]";
		//String regex4Javalog = "^log\\s*\\.\\s*[(finest)(finer)(fine)(warning)(severe)]\\s*\\(\\s*\".*\"\\s*\\)\\s*;";
		str = str.replaceAll(regexLog, "").replaceAll(regex, "");
		//if(Pattern.compile(regex).matcher(str).find()) {
		//}
		
		// TODO (.|\\s)*此处引起异常
		//str = str.replaceAll("\\s+System\\s*\\.\\s*out\\s*\\.\\s*print(ln)?\\s*\\(\\s*\"(.|\\s)*\"\\s*\\)\\s*;", "");
		return str;
	}

	// 太复杂, 而且可能影响原功能,所以,只做简单处理。。  这显然是会影响原有功能的!!
	private static String filterTryCatchs(String str) {
		// TODO
		String regexTry = "";//"try\\s*\\{\\s*";// 暂不处理
		String regexCatch = "\\}\\s*catch\\s*\\(\\s*\\w+\\s+\\w+\\s*\\)\\s*\\{\\s*.+\\s*";
		String regexFinally = "";//"\\s*\\}\\s*finally\\s*\\{\\s*.+\\s*\\}";// 暂不处理
		//str = str.replaceAll(regexTry, "").replaceAll(regexCatch, "").replaceAll(regexFinally, "");
		
		//  
		if(Pattern.compile(regexCatch).matcher(str).find()) {
			str = str.replaceAll(regexCatch, " }catch(Exception e){e.printStackTrace();");
		}
		
		return str;
	}

	// 将 }\n } \n ) \n) ...  的情况合并成 } } ) )...
	private static String foldEmptyRow(String str) {
		// TODO
		return str;
	}
	
	public static String capitalize(String str) {
		if(str==null)return "";
		if(str.length()==1)return str.toUpperCase();
		Character firstLetter = str.charAt(0);
		return Character.toUpperCase(firstLetter)+str.substring(1);
	}

	@SuppressWarnings("unchecked")
	public static boolean checkParetheis(String str) {
		Matcher matcher = Pattern.compile("[\\(\\{\\[<\\)\\}\\]>\"\']").matcher(str);
		Pattern p = Pattern.compile("[\\)\\}\\]>\"\']");
		Stack stack = new Stack<>();
		while(matcher.find()) {
			String c = matcher.group();
			if(p.matcher(c).matches()) {
				if(stack.size()>0){
					char top = ((String) stack.peek()).charAt(0);
					if(c.charAt(0)==converseChar(top)) {
						stack.pop();
					}else {
						stack.push(c);
					}
				}else {
					stack.push(c);
				}
			}else {
				stack.push(c);
			}
		}
		System.out.println("stack remains :" +stack.toString());
		if(stack.size()>0)return false;
		return true;
	}
	
	@SuppressWarnings("unchecked")
	public static boolean checkParetheis(File f) {
		if(f.exists()) {
			FileInputStream fis = null;
			try {
				fis = new FileInputStream(f);
				char c = 'a';
				int ifEnd = 0;
				Stack stack = new Stack<>();
				while((ifEnd=fis.read())!=-1) {// -1 是可以转换为char的,但是 转换之后 c 已经不再是 -1 !!!
					c = (char)ifEnd;
					System.out.print(c);
					if(c=='('||c=='{'||c=='<'||c=='[')stack.push(c);
					else if(c==')'||c=='}'||c=='>'||c==']') {
						char top = (char) stack.peek();
						if(c==converseChar(top)) {
							stack.pop();
						}else {
							stack.push(c);
						}
					}else if(c=='"'||c=='\'') {
						if(stack.size()>0){
							char top = (char) stack.peek();
							if(c==converseChar(top)) {
								stack.pop();
							}else {
								stack.push(c);
							}
						}else {
							stack.push(c);
						}
					}
				}
				System.out.println("ifEnd :"+ifEnd+"  c :"+ (char)(-1));
				if(stack.size()==0)return true;
				
				System.out.println("stack remains :" +stack.toString());
			} catch (FileNotFoundException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}finally {
				try {
					fis.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			
		}
		
		return false;
	}
	

	public static char converseChar(char c) {
		if(c=='(')return ')';
		if(c=='{')return '}';
		if(c=='<')return '>';
		if(c=='[')return ']';
		if(c=='"')return '"';
		if(c=='\'')return '\'';
		return ' ';
	}
	
}

 

 

VarObject是一个简单javaBean:

 

package com.luobk.po;

/**
 * 
 * @author LBK
 *
 */
public class VarObject {


	
	public String getVar() {
		return var;
	}

	public void setVar(String var)
	//dsfs
	{
		
		this.var = var;
	}

	public String  getType( ) 
	{
		
		return  type;
	}

	public   void setType(String  v) 
	{
		type = v;
	}

	// var name
	private String var;
	
	// var type
	private String type;

}

 

 

写是写出来了,但是还是有很多问题。 比如对try catch块到底如何处理比较好? 对于简单行(单字符行)的处理的处理怎么样才好?而且,程序本身有bug,有些地方只是做了简单处理,复杂情况下则引发bug。而且,没有考虑对其他的类的影响... 

 

 

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