KPLMLM

public void nt_ClassDecl() :
  {}
      {
        LOOKAHEAD(2) <CLASS> <ID> <LBRACE> (nt_FieldDecl())* (nt_MethodDecl())* <RBRACE>
       | <CLASS> <ID> <EXTENDS> <ID> <LBRACE> (nt_FieldDecl())*
        (nt_MethodDecl())* <RBRACE>
      }

public void nt_FieldDecl() :
  {}
      {
        nt_Type() <ID> <SEMICOLON>
      }

public void nt_MethodDecl() :
  {}
      {
        nt_ProcDecl() | nt_FunDecl()
      }

public void nt_ProcDecl() :
  {}
      {
        <PROC> <ID> <LPAREN> nt_FormalList() <RPAREN> <LBRACE>
        (nt_Statement())* <RBRACE>
      }

public void nt_FunDecl() :
  {}
     {
        <FUN> nt_Type() <ID> <LPAREN> nt_FormalList() <RPAREN>
        <LBRACE> (nt_Statement())* <RETURN> nt_Exp() <SEMICOLON>
        <RBRACE>
     }

public void nt_FormalList() :
  {}
     {
        nt_Type() <ID> (nt_FormalRest())*
     }

public void nt_FormalRest() :
  {}
     {
        <COMMA> nt_Type() <ID>
     }

public void nt_Type() :
  {}
     {
          <ARRAYOF> <LPAREN> nt_Type() <RPAREN>
        | <BOOLEAN>
        | <INT>
        | <ID>
     }

public void nt_Statement() :
  {}
     {
         nt_Block()
        | LOOKAHEAD(2) nt_Type() <ID> <SEMICOLON>
        | LOOKAHEAD(2)nt_Var() <ASSIGN> nt_Exp() <SEMICOLON>
        | LOOKAHEAD(3)nt_PrimaryExp() <LSBRACE> nt_Exp() <RSBRACE>
          <ASSIGN> nt_Exp()<SEMICOLON>
        | <IF> <LPAREN> nt_Exp() <RPAREN> <THEN>
          nt_Block() <ELSE> nt_Block()
        | <WHILE> <LPAREN> nt_Exp() <RPAREN> <DO> nt_Block()
        | <OUTPUT> nt_Exp() <SEMICOLON>
        | LOOKAHEAD(3)nt_PrimaryExp() <DOT> <ID> <LPAREN> nt_ExpList()
          <RPAREN> <SEMICOLON>
     }

public void nt_Block() :
  {}
     {
        <LBRACE> (nt_Statement())* <RBRACE>
     }

public void nt_Exp() :
  {}
     {
        LOOKAHEAD(2)  nt_PrimaryExp() nt_Op() nt_PrimaryExp()
        | LOOKAHEAD(3) nt_PrimaryExp() <LSBRACE> nt_Exp() <RSBRACE>
        | LOOKAHEAD(3) nt_PrimaryExp() <DOT> <LENGTH>
        | LOOKAHEAD(3) nt_PrimaryExp() <DOT> <ID> <LPAREN> nt_ExpList()
          <RPAREN>
        | LOOKAHEAD(3)nt_PrimaryExp()
     }

public void nt_PrimaryExp() :
  {}
     {
          <INTEGER_LITERAL>
        | <TRUE>
        | <FALSE>
        | nt_Var()
        | <SELF>
        | LOOKAHEAD(2) <NEW> <ARRAYOF> <LPAREN> nt_Type()
          <RPAREN> <LSBRACE> nt_Exp() <RSBRACE>
        | LOOKAHEAD(2) <NEW> <OBJECT> <ID> <LPAREN> nt_ExpList() <RPAREN>
        | <NOT> nt_PrimaryExp()
        | <ISNULL> nt_PrimaryExp()
          <LPAREN> nt_Exp() <RPAREN>
     }

public void nt_Var() :
  {}
     {
          <ID>
     }

public void nt_ExpList() :
  {}
     {
        nt_Exp() (nt_ExpRest())*
     }

public void nt_ExpRest() :
  {}
     {
        <COMMA> nt_Exp()
     }

public void nt_Op() :
  {}
     {
          <AND>
        | <LT>
        | <ASSIGN>
        | <DIV>
        | <PLUS>
        | <MINUS>
        | <MULT>
     }