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options {  USER_TOKEN_MANAGER = true;}PARSER_BEGIN(CalcInputParser)public class CalcInputParser {}PARSER_END(CalcInputParser)void Input() :	{	  double larg = 0.0;	  double rarg;	}{  (     [      larg=Number() 	{	  CalcGUI.print(larg);	}    ]    (      <ADD>      rarg=Number()	{	  larg = larg + rarg;	  CalcGUI.print(larg);	}    |      <SUB>      rarg=Number()	{	  larg = larg - rarg;	  CalcGUI.print(larg);	}    |      <MUL>      rarg=Number()	{	  larg = larg * rarg;	  CalcGUI.print(larg);	}    |      <DIV>      rarg=Number()	{	  larg = (rarg==0) ? Float.POSITIVE_INFINITY : (larg / rarg);	  CalcGUI.print(larg);	}    )*    <EQ: "=" >  )*}double Number() :	{	  Token t;	  String image = "";	  double value = 0.0;	  double decimalPlace = 1.0;	}{  (    t=<DIGIT>	{	  image += t.image;	  value = value*10 + Integer.parseInt(t.image);	  CalcGUI.print(image);	}  )+  [    <DOT>	{	  image += ".";	  CalcGUI.print(image);	}    (      t=<DIGIT>	{	  image += t.image;	  decimalPlace *= 0.1;	  value = value + Integer.parseInt(t.image)*decimalPlace;	  CalcGUI.print(image);	}    )+  ]	{	  return value;	}|  <DOT>	{	  image = "0.";	  CalcGUI.print(image);	}  (    t=<DIGIT>	{	  image += t.image;	  decimalPlace *= 0.1;	  value = value + Integer.parseInt(t.image)*decimalPlace;	  CalcGUI.print(image);	}  )+	{	  return value;	}}