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import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.File;

import java.io.FileReader;

import java.io.FileWriter;

public class RemoveAnnotation2 {

/**

* @Title AnnotationRemove version2

* @Discription using Finit state machine method

* @author Fred

* @time 2014/12/24 0:19

*/

final int LEN=256;

static String inputFile = "";

static String outputFile = "";

int[][] fsm = new int[10][LEN];

int state = 0;

public static void main(String[] args) {

// TODO Auto-generated method stub

if (args.length >= 2) {

inputFile = args[0];

outputFile = args[1];

}else{

System.out.println("Wrong input!");

return;

}

File input = new File(inputFile);

File output = new File(outputFile);

if(!input.exists()){

System.out.println("File doesn't exist!");

return;

}

RemoveAnnotation2 me = new RemoveAnnotation2();

me.initFSM();

try {

me.handleFile(input, output);

} catch (Exception ex) {

ex.printStackTrace();

}

}

public void initFSM() {

//初始化状态机

for (int i = 0; i <LEN; i++) {

fsm[0][i] = 0;

fsm[1][i] = 0;

fsm[2][i] = 2;

fsm[3][i] = 3;

fsm[4][i] = 3;

fsm[5][i] = 5;

fsm[6][i] = 5;

fsm[7][i] = 7;

fsm[8][i] = 7;

fsm[9][i] = 0;

}

fsm[0]['/'] = 1;

fsm[0]['"'] = 5;

fsm[0]['\''] = 7;

fsm[1]['/'] = 2;

fsm[1]['*'] = 3;

fsm[1]['"'] = 5;

fsm[2]['\n'] = 9;

fsm[3]['*'] = 4;

fsm[4]['/'] = 9;

fsm[4]['*'] = 4;

fsm[5]['"'] = 0;

fsm[5]['\\'] = 6;

fsm[7]['\\'] = 8;

fsm[7]['\''] = 0;

fsm[9]['/'] = 1;

fsm[9]['"'] = 5;

fsm[9]['\''] = 7;

}

public int parseChar(char a) {

int result = a;

return result;

}

public char parseInt(int a) {

char result = (char) a;

return result;

}

public void handleFile(File in, File out) throws Exception {

int c;

String temp = "";

char[] cbuf = null;

BufferedReader br = new BufferedReader(new FileReader(in));

BufferedWriter bw = new BufferedWriter(new FileWriter(out));

while ((c = br.read()) != -1) {

if(c>256){

state =fsm[state][' '];

}else{

state = fsm[state][c];

}

temp = temp + parseInt(c);

switch (state) {

case 0:

bw.write(temp);

temp = "";

break;

case 9:

//注释结束态，将除了换行的字符全部替换为“ ”输出。

cbuf = temp.toCharArray();

for (int i = 0; i < cbuf.length; i++){

if ((cbuf[i] != '\n')&&(cbuf[i] != '\r')) cbuf[i] = ' ';

}

bw.write(cbuf);

temp = "";

cbuf = null;

break;

}

}

br.close();

bw.close();

System.out.println("File has been handled successfully!");

}

}