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1   ////////////////////////////////////////////////////////////////////////////////
2   // MillScript: an Open Spice interpreter and batch website creation tool
3   // Copyright (C) 2005 Kevin Rogers
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.functions;
22  
23  import org.millscript.commons.vfs.VEntry;
24  import org.millscript.millscript.alert.Alerts;
25  import org.millscript.millscript.loaders.Loader;
26  import org.millscript.millscript.tools.CastLibrary;
27  import org.millscript.millscript.vm.Machine;
28  import org.millscript.millscript.vm.Package;
29  
30  import java.io.IOException;
31  
32  /**
33   * This class implements the MillScript <code>loadValueFromVEntry</code> function.
34   */
35  public class LoadValueFromVEntryFunction extends Function {
36  
37      /**
38       * The package this function is declared in.
39       */
40      protected final Package pack;
41  
42      /**
43       * Constructs a new LoadValueFromVEntryFunction for the specified package.
44       *
45       * @param pack  the package this function belongs to
46       */
47      public LoadValueFromVEntryFunction( final Package p ) {
48          this.pack = p;
49      }
50  
51      /**
52       * @see org.millscript.millscript.functions.Function#apply(org.millscript.millscript.vm.Machine, int)
53       */
54      @Override
55      public void apply( final Machine mc, final int nargs ) {
56          // We only want a single argument
57          checkNargs( mc, 1, nargs );
58          // Which must be a VEntry
59          final VEntry entry = CastLibrary.toVEntry( mc.popObject() );
60          // Now we must load it.
61          final Loader loader = this.pack.makeLoaderFor( entry );
62          // Get it's value and return it
63          try {
64              mc.pushObject( loader.loadValue() );
65          } catch ( IOException ioex ) {
66              throw(
67                  Alerts.compile( "IOException thrown while loading", null ).
68                  culprit( "file", loader.getOrigin() ).
69                  culprit( "reason", ioex.getMessage() ).
70                  mishap()
71              );
72          }
73      }
74  
75  }