/*
* CatchCmd.java
*
* Copyright (c) 1997 Cornell University.
* Copyright (c) 1997 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and
* redistribution of this file, and for a DISCLAIMER OF ALL
* WARRANTIES.
* 
* Included in SQLite3 port to C# for use in testharness only;  2008 Noah B Hart
*
* RCS @(#) $Id: CatchCmd.java,v 1.2 2000/08/20 06:08:42 mo Exp $
*
*/
using System;
namespace tcl.lang
{

  /// <summary> This class implements the built-in "catch" command in Tcl.</summary>

  class CatchCmd : Command
  {
    /// <summary> This procedure is invoked to process the "catch" Tcl command.
    /// See the user documentation for details on what it does.
    /// 
    /// </summary>
    /// <param name="interp">the current interpreter.
    /// </param>
    /// <param name="argv">command arguments.
    /// </param>
    /// <exception cref=""> TclException if wrong number of arguments.
    /// </exception>

    public TCL.CompletionCode cmdProc( Interp interp, TclObject[] argv )
    {
      if ( argv.Length != 2 && argv.Length != 3 )
      {
        throw new TclNumArgsException( interp, 1, argv, "command ?varName?" );
      }

      TclObject result;
      TCL.CompletionCode code = TCL.CompletionCode.OK;

      try
      {
        interp.eval( argv[1], 0 );
      }
      catch ( TclException e )
      {
        code = e.getCompletionCode();
      }

      result = interp.getResult();

      if ( argv.Length == 3 )
      {
        try
        {
          interp.setVar( argv[2], result, 0 );
        }
        catch ( TclException e )
        {
          throw new TclException( interp, "couldn't save command result in variable" );
        }
      }

      interp.resetResult();
      interp.setResult( TclInteger.newInstance( (int)code ) );
      return TCL.CompletionCode.RETURN;
    }
  }
}