/*
* ForCmd.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: ForCmd.java,v 1.1.1.1 1998/10/14 21:09:19 cvsadmin Exp $
*
*/
using System;
namespace tcl.lang
{

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

  class ForCmd : Command
  {
    /*
    * This procedure is invoked to process the "for" Tcl command.
    * See the user documentation for details on what it does.
    *
    * @param interp the current interpreter.
    * @param argv command arguments.
    * @exception TclException if script causes error.
    */

    public TCL.CompletionCode cmdProc( Interp interp, TclObject[] argv )
    {
      if ( argv.Length != 5 )
      {
        throw new TclNumArgsException( interp, 1, argv, "start test next command" );
      }

      TclObject start = argv[1];

      string test = argv[2].ToString();
      TclObject next = argv[3];
      TclObject command = argv[4];

      bool done = false;
      try
      {
        interp.eval( start, 0 );
      }
      catch ( TclException e )
      {
        interp.addErrorInfo( "\n    (\"for\" initial command)" );
        throw;
      }

      while ( !done )
      {
        if ( !interp.expr.evalBoolean( interp, test ) )
        {
          break;
        }

        try
        {
          interp.eval( command, 0 );
        }
        catch ( TclException e )
        {
          switch ( e.getCompletionCode() )
          {

            case TCL.CompletionCode.BREAK:
              done = true;
              break;


            case TCL.CompletionCode.CONTINUE:
              break;


            case TCL.CompletionCode.ERROR:
              interp.addErrorInfo( "\n    (\"for\" body line " + interp.errorLine + ")" );
              throw;


            default:
              throw;

          }
        }

        if ( !done )
        {
          try
          {
            interp.eval( next, 0 );
          }
          catch ( TclException e )
          {
            switch ( e.getCompletionCode() )
            {

              case TCL.CompletionCode.BREAK:
                done = true;
                break;


              case TCL.CompletionCode.CONTINUE:
                break;


              default:
                interp.addErrorInfo( "\n    (\"for\" loop-end command)" );
                throw;

            }
          }
        }
      }

      interp.resetResult();
      return TCL.CompletionCode.RETURN;
    }
  }
}