/*
* UplevelCmd.java --
*
*	Implements the "uplevel" command.
*
* 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: UplevelCmd.java,v 1.3 1999/07/12 02:38:53 mo Exp $
*
*/
using System;
namespace tcl.lang
{

  /*
  * This class implements the built-in "uplevel" command in Tcl.
  */

  class UplevelCmd : Command
  {

    public TCL.CompletionCode cmdProc( Interp interp, TclObject[] objv )
    {
      string optLevel;
      int result;
      CallFrame savedVarFrame, frame;
      int objc = objv.Length;
      int objv_index;
      TclObject cmd;

      if ( objv.Length < 2 )
      {
        throw new TclNumArgsException( interp, 1, objv, "?level? command ?arg ...?" );
      }

      // Find the level to use for executing the command.


      optLevel = objv[1].ToString();
      // Java does not support passing a reference by refernece so use an array
      CallFrame[] frameArr = new CallFrame[1];
      result = CallFrame.getFrame( interp, optLevel, frameArr );
      frame = frameArr[0];

      objc -= ( result + 1 );
      if ( objc == 0 )
      {
        throw new TclNumArgsException( interp, 1, objv, "?level? command ?arg ...?" );
      }
      objv_index = ( result + 1 );

      // Modify the interpreter state to execute in the given frame.

      savedVarFrame = interp.varFrame;
      interp.varFrame = frame;

      // Execute the residual arguments as a command.

      if ( objc == 1 )
      {
        cmd = objv[objv_index];
      }
      else
      {
        cmd = TclString.newInstance( Util.concat( objv_index, objv.Length - 1, objv ) );
      }
      cmd.preserve();

      try
      {
        interp.eval( cmd, 0 );
      }
      catch ( TclException e )
      {
        if ( e.getCompletionCode() == TCL.CompletionCode.ERROR )
        {
          interp.addErrorInfo( "\n    (\"uplevel\" body line " + interp.errorLine + ")" );
        }
        throw;
      }
      finally
      {
        interp.varFrame = savedVarFrame;
        cmd.release();
      }
      return TCL.CompletionCode.RETURN;
    }
  } // end UplevelCmd
}