package rexExp;
 
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
 
public class CodeCounter {
 //三个静态变量存储行数
 static long normalLines = 0;
 static long commentLines = 0;
 static long whileLines = 0;
 
 public static void main(String[] args) {
 String pathname = "E:\\testeclipseworkspace\\JavaLearn\\src\\collection";
 File file = new File(pathname);
 File[] codeFiles = file.listFiles();//找到文件夹下面的所有子文件
 //文件必须是以.java结尾，用正则表达式来验证
 for(File child : codeFiles){
  if (child.getName().matches(".*\\.java$")) {
  parse(child);
  }
 }
 
 
 System.out.println("normalLines:" + normalLines);
 System.out.println("commentLines:" + commentLines);
 System.out.println("whileLines:" + whileLines);
 
 }
 
 private static void parse(File file) {
 BufferedReader bReader = null;
 boolean comment = false;
 try {
  bReader = new BufferedReader(new FileReader(file));
  //读其中的每一行
  String line = "";
  while((line=bReader.readLine()) != null){
  line = line.trim();//去掉首尾空格
  //统计空行的行数
  if (line.matches("^[\\s&&[^\\n]]*$")) {
   whileLines++;
  }
  //统计注释的行数
  else if (line.startsWith("/*") && !line.endsWith("*/")) {
   commentLines++;
   //如果遇到"/*"，说明注释开始了
   comment = true;
  }
  else if (line.startsWith("/*") && line.endsWith("*/")) {
   commentLines++;
  }
  else if (true == comment) {
   commentLines++;
   if (line.endsWith("*/")) {
   comment = false;
   }
  }
  else if(line.startsWith("//")){
   commentLines++;
  }
  else {
   normalLines++;
  }
  }
 } catch (FileNotFoundException e) {
  e.printStackTrace();
 } catch (IOException e) {
  e.printStackTrace();
 }finally {
  if (bReader != null) {
  try {
   bReader.close();
  } catch (IOException e) {
   e.printStackTrace();
  }
  }
 }
 }
}