84 lines
2.8 KiB
C
84 lines
2.8 KiB
C
/***********************************************************************/
|
|
/* */
|
|
/* MLTk, Tcl/Tk interface of Objective Caml */
|
|
/* */
|
|
/* Francois Rouaix, Francois Pessaux, Jun Furuse and Pierre Weis */
|
|
/* projet Cristal, INRIA Rocquencourt */
|
|
/* Jacques Garrigue, Kyoto University RIMS */
|
|
/* */
|
|
/* Copyright 2002 Institut National de Recherche en Informatique et */
|
|
/* en Automatique and Kyoto University. All rights reserved. */
|
|
/* This file is distributed under the terms of the GNU Library */
|
|
/* General Public License, with the special exception on linking */
|
|
/* described in file LICENSE found in the Objective Caml source tree. */
|
|
/* */
|
|
/***********************************************************************/
|
|
|
|
/* $Id$ */
|
|
|
|
#include <tcl.h>
|
|
#include <tk.h>
|
|
#include <mlvalues.h>
|
|
#include <alloc.h>
|
|
#include <callback.h>
|
|
#include <fail.h>
|
|
#include "camltk.h"
|
|
|
|
value * tkerror_exn = NULL;
|
|
value * handler_code = NULL;
|
|
|
|
/* The Tcl command for evaluating callback in Caml */
|
|
int CamlCBCmd(ClientData clientdata, Tcl_Interp *interp, int argc, char **argv)
|
|
{
|
|
CheckInit();
|
|
|
|
/* Assumes no result */
|
|
Tcl_SetResult(interp, NULL, NULL);
|
|
if (argc >= 2) {
|
|
int id;
|
|
if (Tcl_GetInt(interp, argv[1], &id) != TCL_OK)
|
|
return TCL_ERROR;
|
|
callback2(*handler_code,Val_int(id),copy_string_list(argc - 2,&argv[2]));
|
|
/* Never fails (Caml would have raised an exception) */
|
|
/* but result may have been set by callback */
|
|
return TCL_OK;
|
|
}
|
|
else
|
|
return TCL_ERROR;
|
|
}
|
|
|
|
/* Callbacks are always of type _ -> unit, to simplify storage
|
|
* But a callback can nevertheless return something (to Tcl) by
|
|
* using the following. TCL_VOLATILE ensures that Tcl will make
|
|
* a copy of the string
|
|
*/
|
|
CAMLprim value camltk_return (value v)
|
|
{
|
|
CheckInit();
|
|
|
|
Tcl_SetResult(cltclinterp, String_val(v), TCL_VOLATILE);
|
|
return Val_unit;
|
|
}
|
|
|
|
/* Note: raise_with_string WILL copy the error message */
|
|
CAMLprim void tk_error(char *errmsg)
|
|
{
|
|
raise_with_string(*tkerror_exn, errmsg);
|
|
}
|
|
|
|
|
|
/* The initialisation of the C global variables pointing to Caml values
|
|
must be made accessible from Caml, so that we are sure that it *always*
|
|
takes place during loading of the protocol module
|
|
*/
|
|
|
|
CAMLprim value camltk_init(value v)
|
|
{
|
|
/* Initialize the Caml pointers */
|
|
if (tkerror_exn == NULL)
|
|
tkerror_exn = caml_named_value("tkerror");
|
|
if (handler_code == NULL)
|
|
handler_code = caml_named_value("camlcb");
|
|
return Val_unit;
|
|
}
|