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program : program line
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program : program line
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    | ;
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    | ;
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line: NL        { if (interactive) System.out.print (input_str); r.reset(); }
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line: NL            { if (interactive) System.out.print (input_str); r.reset(); }
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    | S NL      { System.out.println ("There are: " + r.getVal() + " apples in the bag!");
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    | S NL          { System.out.println ("There are: " + r.getVal() + " apples in the bag!");
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                  if (interactive) System.out.print (input_str); r.reset(); };
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                      if (interactive) System.out.print (input_str); r.reset(); };
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S : PUT S TAKE S    { System.out.println ("S -> PUT S TAKE S"); }
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S : P S T S         { System.out.println ("S -> P S T S"); }
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    | PUT S         { System.out.println ("S -> PUT S"); r.incVal(); }
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    | P S           { System.out.println ("S -> P S"); }
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    |               { System.out.println ("S -> epsilon"); };
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    |               { System.out.println ("S -> epsilon"); };
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P : PUT             { System.out.println ("P -> p"); r.incVal(); };
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T : TAKE            { System.out.println ("T -> t"); r.decVal(); };
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private Yylex lexer;
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private Yylex lexer;
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static boolean interactive = false;
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static boolean interactive = false;
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static String input_str = "Input: ";
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static String input_str = "Input: ";