/**
 * JJTree template file created by SF JavaCC plugin 1.5.17+ wizard for JavaCC 1.5.0+
 */
options
{
  JDK_VERSION = "1.5";
  static = true;

  BUILD_NODE_FILES = true;
  MULTI = true;

  VISITOR = true;
  VISITOR_RETURN_TYPE = "Object";
  VISITOR_EXCEPTION = "";
}

PARSER_BEGIN(EG2)

public class EG2
{
  public static void main(String args [])
  {
    EvaluateVisitor ev = new EvaluateVisitor();
    System.out.println("Reading from standard input...");
    System.out.print("Enter an expression like \"1+(2+3)*var;\" :");
    new EG2(System.in);
    try
    {
      SimpleNode n = EG2.Start();
      System.out.println("Eval: " + (Integer)n.jjtAccept(ev, null));
      //n.dump("");
      System.out.println("Thank you.");
    }
    catch (Exception e)
    {
      System.out.println("Oops.");
      System.out.println(e.getMessage());
    }
  }
}

PARSER_END(EG2)

SKIP :
{
  " "
| "\t"
| "\n"
| "\r"
| < "//" (~[ "\n", "\r" ])*
    (
      "\n"
    | "\r"
    | "\r\n"
    ) >
| < "/*" (~[ "*" ])* "*"
    (
      ~[ "/" ] (~[ "*" ])* "*"
    )*
    "/" >
}

TOKEN : /* LITERALS */
{
  < INTEGER_LITERAL :
    < DECIMAL_LITERAL > ([ "l", "L" ])?
  | < HEX_LITERAL > ([ "l", "L" ])?
  | < OCTAL_LITERAL > ([ "l", "L" ])? 
    >
| < #DECIMAL_LITERAL : [ "1"-"9" ] ([ "0"-"9" ])* >
| < #HEX_LITERAL : "0" [ "x", "X" ] ([ "0"-"9", "a"-"f", "A"-"F" ])+ >
| < #OCTAL_LITERAL : "0" ([ "0"-"7" ])* >
}

TOKEN : /* IDENTIFIERS */
{
  < IDENTIFIER :
    < LETTER >
    (
      < LETTER >
    | < DIGIT >
    )* >
| < #LETTER : [ "_", "a"-"z", "A"-"Z" ] >
| < #DIGIT : [ "0"-"9" ] >
}

SimpleNode Start() :
{}
{
  Expression() ";"
  {
    return jjtThis;
  }
}

void Expression() :
{}
{
  AdditiveExpression()
}

void AdditiveExpression() :
{}
{
  MultiplicativeExpression()
  (
    (
      "+"
    | "-"
    )
    MultiplicativeExpression()
  )*
}

void MultiplicativeExpression() :
{}
{
  UnaryExpression()
  (
    (
      "*"
    | "/"
    | "%"
    )
    UnaryExpression()
  )*
}

void UnaryExpression() :
{}
{
  "(" Expression() ")"
| Identifier()
| Integer()
}

SimpleNode Identifier() :
{ Token t;}
{
  t = < IDENTIFIER >
  {
    jjtThis.jjtSetValue( t.image );
    return jjtThis;
  }
}

SimpleNode Integer() :
{Token t;}
{
  t = < INTEGER_LITERAL >
  {
	jjtThis.jjtSetValue( t.image );
	return jjtThis;
  }
}