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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.office.spreadsheet.formula.syntax;
22  
23  import org.millscript.millscript.expr.Expr;
24  import org.millscript.millscript.syntax.BothfixSyntax;
25  import org.millscript.millscript.syntax.Parser;
26  import org.millscript.office.spreadsheet.formula.expr.AddExpr;
27  
28  /**
29   * This class implements arithmetic syntax. In some ways this is a variation of
30   * {@link InfixSyntax}, as the arithmetic operator sits between it's operands.
31   *
32   * <p>
33   * <code>&lt;expr&gt; -- &lt;expr&gt;</code>
34   * </p>
35   *
36   * @see AddExpr
37   */
38  public final class AddSyntax extends BothfixSyntax {
39  
40      /**
41       * @see org.millscript.millscript.syntax.PostfixSyntaxInterface#postfix(java.lang.String, int, org.millscript.millscript.expr.Expr, org.millscript.millscript.syntax.Parser)
42       */
43      @Override
44      public Expr postfix( final String sym, final int prec, final Expr lhs, final Parser parser ) {
45          // Read the right hand side expression
46          Expr rhs = parser.readExprPrec( prec );
47          // Return a new arithmetic expression for the parsed syntax
48          return new AddExpr( lhs, rhs );
49      }
50  
51      /**
52       * @see org.millscript.millscript.syntax.PrefixSyntaxInterface#prefix(java.lang.String, org.millscript.millscript.syntax.Parser)
53       */
54      @Override
55      public Expr prefix( final String sym, final Parser parser ) {
56          // A plus prefix simply has no effect on the operand
57          return parser.readExpr();
58      }
59  
60  }