package chapter2;

import java.io.*;
import java.net.*;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;

public class WebParser { 

private static String src_File_Path = "c:\\workshop\\ch2\\htmlsrc.html";
private static String dst_File_Path = "c:\\workshop\\ch2\\puresrc.txt";

 public static void main(String[] args) throws IOException {
	 
        try { 
        	
        	Parser();
       } catch (IOException e) { 
           System.err.println("下載失敗，請檢查輸入地址是否正確。");  
           System.exit(1);
       } 
  }
 
 public static void Parser()  throws IOException {
     try { 
    	 
        boolean bContent = true;
        StringBuffer sBuffer = new StringBuffer(8096*2); 
        char[] cBuffer = new char[8096*2]; 
        int nCount = 0;
         
     	File srcfile = new File(src_File_Path);
		FileReader fpReader = new FileReader(srcfile);
		
		File dstfile = new File(dst_File_Path);
		FileWriter fpWriter = new FileWriter(dstfile);

    	nCount = fpReader.read(cBuffer);

		for(int i = 0; i < nCount;i++)
        {
            if( bContent == false )
            {
                if(cBuffer[i] == '>')
                	bContent = true;
                else
                    continue;
            } else {
                if(cBuffer[i] == '<')
                {
                	bContent = false;
                    continue;
                } else if(cBuffer[i] == '\n' || cBuffer[i] == ' ' || cBuffer[i] == '　' ||  cBuffer[i] == '	')
                {
                	continue;
                }else if(  cBuffer[i]   == '&' && cBuffer[i+1] == 'n' 
                	    && cBuffer[i+2] == 'b' && cBuffer[i+3] == 's' 
                	    && cBuffer[i+4] == 'p' && cBuffer[i+5] == ';')
                {
                	i =i+5;
                	continue;
                }
                
            	sBuffer.append(cBuffer[i]);
            }
        }
		
		System.out.println(sBuffer.toString());
		fpWriter.write(sBuffer.toString());

		fpReader.close();
		fpWriter.close(); 
     } catch (UnknownHostException e) {
         System.err.println("無法訪問指定主機."); 
         System.exit(1);
    } catch (IOException e) { 

        throw e;
    }  
 }

}