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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.expr;
22  
23  import org.millscript.millscript.action.ListAction;
24  import org.millscript.millscript.vm.CompilerState;
25  
26  /**
27   * This class implements a list expression. This expression always returns a
28   * single result.
29   *
30   * @see org.millscript.millscript.syntax.ListSyntax
31   * @see ListAction
32   */
33  public final class ListExpr extends Expr< ListAction > implements OneResult {
34  
35      /**
36       * The lists body expression. This expression generates results to populate
37       * the list.
38       */
39      private final Expr< ? > body;
40  
41      /**
42       * Creates a new list expression for the specified body expression. The
43       * body expression generates results to populate the list.
44       *
45       * @param   b   the lists body expression
46       */
47      public ListExpr( final Expr< ? > b ) {
48          body = b;
49      }
50  
51      /**
52       * @see org.millscript.millscript.expr.Expr#compileIt()
53       */
54      @Override
55      public ListAction compileIt() {
56          return new ListAction( body.compile() );
57      }
58  
59      /**
60       * @see org.millscript.millscript.expr.Expr#resolve(org.millscript.millscript.vm.CompilerState)
61       */
62      @Override
63      public void resolve( final CompilerState state ) {
64          this.body.resolve( state );
65      }
66  
67      /**
68       * @see org.millscript.millscript.expr.Expr#showComponents(int)
69       */
70      @Override
71      void showComponents( final int n ) {
72          this.body.show( n );
73      }
74  
75  }