/*
* GlobalCmd.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: GlobalCmd.java,v 1.2 1999/08/03 02:55:41 mo Exp $
*
*/
using System;
namespace tcl.lang
{

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

  class GlobalCmd : Command
  {
    /// <summary> See Tcl user documentation for details.</summary>

    public TCL.CompletionCode cmdProc( Interp interp, TclObject[] objv )
    {
      if ( objv.Length < 2 )
      {
        throw new TclNumArgsException( interp, 1, objv, "varName ?varName ...?" );
      }

      //  If we are not executing inside a Tcl procedure, just return.

      if ( ( interp.varFrame == null ) || !interp.varFrame.isProcCallFrame )
      {
        return TCL.CompletionCode.RETURN;
      }

      for ( int i = 1; i < objv.Length; i++ )
      {

        // Make a local variable linked to its counterpart in the global ::
        // namespace.

        TclObject obj = objv[i];

        string varName = obj.ToString();

        // The variable name might have a scope qualifier, but the name for
        // the local "link" variable must be the simple name at the tail.

        int tail = varName.Length;

        tail -= 1; // tail should start on the last index of the string

        while ( ( tail > 0 ) && ( ( varName[tail] != ':' ) || ( varName[tail - 1] != ':' ) ) )
        {
          tail--;
        }
        if ( varName[tail] == ':' )
        {
          tail++;
        }

        // Link to the variable "varName" in the global :: namespace.

        Var.makeUpvar( interp, null, varName, null, TCL.VarFlag.GLOBAL_ONLY, varName.Substring( tail ), 0 );
      }
      return TCL.CompletionCode.RETURN;
    }
  }
}