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/***********************************************************************/
/* */
/* MLTk, Tcl/Tk interface of OCaml */
/* */
/* 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 OCaml source tree. */
/* */
/***********************************************************************/
/* $Id$ */
/* Alternative to tkwait variable */
#include <string.h>
#include <tcl.h>
#include <tk.h>
#include <mlvalues.h>
#include <memory.h>
#include <alloc.h>
#include <callback.h>
#include "camltk.h"
CAMLprim value camltk_getvar(value var)
{
char *s;
char *stable_var = NULL;
CheckInit();
stable_var = string_to_c(var);
s = (char *)Tcl_GetVar(cltclinterp,stable_var,
TCL_GLOBAL_ONLY|TCL_LEAVE_ERR_MSG);
caml_stat_free(stable_var);
if (s == NULL)
tk_error(Tcl_GetStringResult(cltclinterp));
else
return(tcl_string_to_caml(s));
}
CAMLprim value camltk_setvar(value var, value contents)
{
char *s;
char *stable_var = NULL;
char *utf_contents;
CheckInit();
/* SetVar makes a copy of the contents. */
/* In case we have write traces in OCaml, it's better to make sure that
var doesn't move... */
stable_var = string_to_c(var);
utf_contents = caml_string_to_tcl(contents);
s = (char *)Tcl_SetVar(cltclinterp,stable_var, utf_contents,
TCL_GLOBAL_ONLY|TCL_LEAVE_ERR_MSG);
caml_stat_free(stable_var);
if( s == utf_contents ){
tk_error("camltk_setvar: Tcl_SetVar returned strange result. Call the author of mlTk!");
}
caml_stat_free(utf_contents);
if (s == NULL)
tk_error(Tcl_GetStringResult(cltclinterp));
else
return(Val_unit);
}
/* The appropriate type is
typedef char *(Tcl_VarTraceProc) (ClientData clientData,
Tcl_Interp *interp, char *part1, char *part2, int flags);
*/
static char * tracevar(ClientData clientdata, Tcl_Interp *interp,
const char *name1, const char *name2, int flags)
/* interp -> Interpreter containing variable. */
/* name1 -> Name of variable. */
/* name2 -> Second part of variable name. */
/* flags -> Information about what happened. */
{
Tcl_UntraceVar2(interp, name1, name2,
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
tracevar, clientdata);
caml_callback2(*handler_code,Val_int(clientdata),Val_unit);
return (char *)NULL;
}
/* Sets up a callback upon modification of a variable */
CAMLprim value camltk_trace_var(value var, value cbid)
{
char *cvar = NULL;
CheckInit();
/* Make a copy of var, since Tcl will modify it in place, and we
* don't trust that much what it will do here
*/
cvar = string_to_c(var);
if (Tcl_TraceVar(cltclinterp, cvar,
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
tracevar,
(ClientData) (Long_val(cbid)))
!= TCL_OK) {
caml_stat_free(cvar);
tk_error(Tcl_GetStringResult(cltclinterp));
};
caml_stat_free(cvar);
return Val_unit;
}
CAMLprim value camltk_untrace_var(value var, value cbid)
{
char *cvar = NULL;
CheckInit();
/* Make a copy of var, since Tcl will modify it in place, and we
* don't trust that much what it will do here
*/
cvar = string_to_c(var);
Tcl_UntraceVar(cltclinterp, cvar,
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
tracevar,
(ClientData) (Long_val(cbid)));
caml_stat_free(cvar);
return Val_unit;
}
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