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1   ////////////////////////////////////////////////////////////////////////////////
2   // MillScript: an Open Spice interpreter and batch website creation tool
3   // Copyright (C) 2001-2004 Open World Ltd
4   //
5   // This file is part of MillScript.
6   //
7   // MillScript is free software; you can redistribute it and/or modify it under
8   // the terms of the GNU General Public License as published by the Free
9   // Software Foundation; either version 2 of the License, or (at your option)
10  // any later version.
11  //
12  // MillScript is distributed in the hope that it will be useful, but WITHOUT
13  // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14  // FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
15  // more details.
16  //
17  // You should have received a copy of the GNU General Public License along with
18  // MillScript; if not, write to the Free Software Foundation, Inc., 59 Temple
19  // Place, Suite 330, Boston, MA  02111-1307  USA
20  ////////////////////////////////////////////////////////////////////////////////
21  package org.millscript.millscript.syntax;
22  
23  import org.millscript.millscript.expr.Expr;
24  
25  /**
26   * This class represents postfix syntax, that which follows an expression it
27   * operates on and have an expression follow it. This is a convenience class to
28   * reduce the work required to implement a piece of postfix syntax.
29   */
30  public abstract class PostfixSyntax extends Syntax implements PostfixSyntaxInterface {
31  
32      /**
33       * This syntax's precedence. Higher values represent more tightly bound
34       * syntax.
35       */
36      private int precedence = 0;
37  
38      /**
39       * @see org.millscript.millscript.syntax.PostfixSyntaxInterface#getPrecedence()
40       */
41      public int getPrecedence() {
42          return precedence;
43      }
44  
45      /**
46       * Sets the precedence for this postfix syntax and then returns the syntax
47       * object.
48       *
49       * @param   p   the new value for the precedence
50       * @return  this syntax object
51       */
52      public PostfixSyntax setPrec( final int p ) {
53          precedence = p; return this;
54      }
55  
56      /**
57       * @see org.millscript.millscript.syntax.PostfixSyntaxInterface#postfix(java.lang.String, int, org.millscript.millscript.expr.Expr, org.millscript.millscript.syntax.Parser)
58       */
59      public abstract Expr postfix( final String sym, final int prec, final Expr lhs, final Parser parser );
60  
61  }