/*
* UpvarCmd.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: UpvarCmd.java,v 1.3 1999/07/12 02:38:53 mo Exp $
*
*/
using System;
namespace tcl.lang
{

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

  class UpvarCmd : Command
  {
    /// <summary> Tcl_UpvarObjCmd -> UpvarCmd.cmdProc
    /// 
    /// This procedure is invoked to process the "upvar" Tcl command.
    /// See the user documentation for details on what it does.
    /// </summary>

    public TCL.CompletionCode cmdProc( Interp interp, TclObject[] objv )
    {
      CallFrame frame;
      string frameSpec, otherVarName, myVarName;
      int p;
      int objc = objv.Length, objv_index;
      int result;

      if ( objv.Length < 3 )
      {
        throw new TclNumArgsException( interp, 1, objv, "?level? otherVar localVar ?otherVar localVar ...?" );
      }

      // Find the call frame containing each of the "other variables" to be
      // linked to. 


      frameSpec = 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, frameSpec, frameArr );
      frame = frameArr[0];
      objc -= ( result + 1 );
      if ( ( objc & 1 ) != 0 )
      {
        throw new TclNumArgsException( interp, 1, objv, "?level? otherVar localVar ?otherVar localVar ...?" );
      }
      objv_index = result + 1;


      // Iterate over each (other variable, local variable) pair.
      // Divide the other variable name into two parts, then call
      // MakeUpvar to do all the work of linking it to the local variable.

      for ( ; objc > 0; objc -= 2, objv_index += 2 )
      {

        myVarName = objv[objv_index + 1].ToString();

        otherVarName = objv[objv_index].ToString();

        int otherLength = otherVarName.Length;
        p = otherVarName.IndexOf( (System.Char)'(' );
        if ( ( p != -1 ) && ( otherVarName[otherLength - 1] == ')' ) )
        {
          // This is an array variable name
          Var.makeUpvar( interp, frame, otherVarName.Substring( 0, ( p ) - ( 0 ) ), otherVarName.Substring( p + 1, ( otherLength - 1 ) - ( p + 1 ) ), 0, myVarName, 0 );
        }
        else
        {
          // This is a scalar variable name
          Var.makeUpvar( interp, frame, otherVarName, null, 0, myVarName, 0 );
        }
      }
      interp.resetResult();
      return TCL.CompletionCode.RETURN;
    }
  }
}