/*
 *  R : A Computer Langage for Statistical Data Analysis
 *  Copyright (C) 1995, 1996  Robert Gentleman and Ross Ihaka
 *  Copyright (C) 1998-2000   The R Development Core Team.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "Defn.h"

SEXP do_debug(SEXP call, SEXP op, SEXP args, SEXP rho)
{
    checkArity(op,args);
#define find_char_fun \
    if (isValidString(CAR(args))) {				\
	SEXP s;							\
	PROTECT(s = install(CHAR(STRING_ELT(CAR(args), 0))));	\
	SETCAR(args, findFun(s, rho));				\
	UNPROTECT(1);						\
    }
    find_char_fun

    if (TYPEOF(CAR(args)) != CLOSXP)
	errorcall(call, "argument must be a function");
    switch(PRIMVAL(op)) {
    case 0:
	SET_DEBUG(CAR(args), 1);
	break;
    case 1:
	if( DEBUG(CAR(args)) != 1 )
	    warningcall(call, "argument is not being debugged");
	SET_DEBUG(CAR(args), 0);
	break;
    }
    return R_NilValue;
}

SEXP do_trace(SEXP call, SEXP op, SEXP args, SEXP rho)
{
    checkArity(op, args);

    find_char_fun

    if (TYPEOF(CAR(args)) != CLOSXP &&
	TYPEOF(CAR(args)) != BUILTINSXP &&
	TYPEOF(CAR(args)) != SPECIALSXP)
	    errorcall(call, "argument must be a function");

    switch(PRIMVAL(op)) {
    case 0:
	SET_TRACE(CAR(args), 1);
	break;
    case 1:
	SET_TRACE(CAR(args), 0);
	break;
    }
    return R_NilValue;
}


/* maintain global trace state */

static Rboolean tracing_state = TRUE;
#define GET_TRACE_STATE tracing_state
#define SET_TRACE_STATE(value) tracing_state = value

SEXP R_traceOnOff(SEXP onOff) {
    SEXP value;
    Rboolean prev = GET_TRACE_STATE;
    if(length(onOff) > 0) {
        Rboolean new = asLogical(onOff);
        if(new == TRUE || new == FALSE)
            SET_TRACE_STATE(new);
        else
            error("Value for tracingState must be TRUE or FALSE");
    }
    value = allocVector(LGLSXP, 1);
    LOGICAL(value)[0] = prev;
    return value;
}

Rboolean R_current_trace_state() { return GET_TRACE_STATE; }