/*
* ExprCmd.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: ExprCmd.java,v 1.2 1999/05/08 23:59:30 dejong Exp $
*
*/
using System.Text;
namespace tcl.lang
{

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

  class ExprCmd : Command
  {
    /// <summary> Evaluates a Tcl expression. See Tcl user documentation for
    /// details.
    /// </summary>
    /// <exception cref=""> TclException If malformed expression.
    /// </exception>

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

      if ( argv.Length == 2 )
      {

        interp.setResult( interp.expr.eval( interp, argv[1].ToString() ) );
      }
      else
      {
        StringBuilder sbuf = new StringBuilder();

        sbuf.Append( argv[1].ToString() );
        for ( int i = 2; i < argv.Length; i++ )
        {
          sbuf.Append( ' ' );

          sbuf.Append( argv[i].ToString() );
        }
        interp.setResult( interp.expr.eval( interp, sbuf.ToString() ) );
      }
      return TCL.CompletionCode.RETURN;
    }
  }
}