import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


public class CodeCounter {

    static int blankLine;                           //空白行
    static int commentLine;                  //注释行
    static int validLine;                      //有效行
    static Pattern pBlank = Pattern.compile("^[\\s[^\\n]]*$");
    
    public static void main(String[] args) {
        File f =new File("E:\\Eclipse\\Workspace\\RegExp\\src\\");
        File[] fa = f.listFiles();
        BufferedReader br = null;;
        String line = null;
        for(File child : fa) {
            if(child.getName().matches(".*\\.java$")) {
                try {
                    br = new BufferedReader(new FileReader(child));
                    while((line=br.readLine())!=null) {
                        parse(line);
                    br.close();
                    }
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        System.out.println("blankLine: " + blankLine);
        System.out.println("commentLine: " + commentLine);
        System.out.println("validLine: " + validLine);

    }

    private static void parse(String line) {
        boolean flag = false;
        if(line.matches(pBlank.pattern()))  {
            blankLine++;
        }else if(line.startsWith("/*")&&!line.endsWith("*/")) {
            commentLine++;
            flag = true;
        }else if(flag==true) {
            commentLine++;
            if(line.endsWith("*/"))
                flag = false;
        }else validLine++;
    }
}