//  StringLiteralsFromSourceFile.java  (c) Kari Laitinen

//  http://www.naturalprogramming.com

//  2014-05-16  File created.
//  2015-01-02  Last modification.

import java.io.* ;
import java.util.* ;


import java.util.regex.Matcher;
import java.util.regex.Pattern;

class StringLiteralsFromSourceFile
{
   public static void main( String[] not_in_use )
   {
      Scanner keyboard = new Scanner( System.in ) ;

      String  file_to_process  =  "Testfile.java" ;

      System.out.print( "\n The following was found in " + file_to_process
                     +  " \n" ) ;

      Pattern string_literals_pattern

         = Pattern.compile( "\"[^\"]*\"" ) ; // manages only simple string literals

      try
      {
         BufferedReader buffered_reader =
             new BufferedReader( new FileReader( file_to_process ) ) ;

         int line_counter  =  0 ;
         boolean  end_of_file_encountered  =  false ;

         while ( end_of_file_encountered  ==  false )
         {
            String text_line_from_file  =  buffered_reader.readLine() ;

            if ( text_line_from_file  ==  null )
            {
               end_of_file_encountered  =  true ;
            }
            else
            {
               line_counter  ++  ;
               
               Matcher string_literals_matcher =
                        string_literals_pattern.matcher( text_line_from_file ) ;

               while ( string_literals_matcher.find() )
               {
                  System.out.print( "\n  " + string_literals_matcher.group() ) ;
               }
            }
         }

         buffered_reader.close() ;
         System.out.print( "\n  " + line_counter + " lines processed.\n" ) ;
      }
      catch ( FileNotFoundException  caught_file_not_found_exception )
      {
         System.out.print( "\n \"" + file_to_process + "\" not found.\n" ) ;
      }
      catch ( IOException  caught_io_exception )
      {
         System.out.print( "\n\n  File reading error.  \n" ) ;
      }
   }
}