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/* Copyright (C) 1995,1996 Free Software Foundation, Inc.
*
* 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, 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 software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*
* As a special exception, the Free Software Foundation gives permission
* for additional uses of the text contained in its release of GUILE.
*
* The exception is that, if you link the GUILE library with other files
* to produce an executable, this does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* Your use of that executable is in no way restricted on account of
* linking the GUILE library code into it.
*
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*
* This exception applies only to the code released by the
* Free Software Foundation under the name GUILE. If you copy
* code from other Free Software Foundation releases into a copy of
* GUILE, as the General Public License permits, the exception does
* not apply to the code that you add in this way. To avoid misleading
* anyone as to the status of such modified files, you must delete
* this exception notice from them.
*
* If you write modifications of your own for GUILE, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice. */
/* This file and objects.h contains those minimal pieces of the Guile
* Object Oriented Programming System which need to be included in
* libguile. See the comments in objects.h.
*/
#include "_scm.h"
#include "struct.h"
#include "procprop.h"
#include "objects.h"
SCM scm_metaclass_standard;
SCM scm_metaclass_operator;
SCM_PROC (s_set_object_procedure_x, "set-object-procedure!", 1, 0, 1, scm_set_object_procedure_x);
SCM
scm_set_object_procedure_x (SCM obj, SCM procs)
{
SCM proc[4], *pp, p, setp, arity;
int i, a, r;
SCM_ASSERT (SCM_NIMP (obj) && SCM_STRUCTP (obj)
&& ((SCM_CLASS_FLAGS (obj) & SCM_CLASSF_OPERATOR)
|| SCM_I_ENTITYP (obj)),
obj,
SCM_ARG1,
s_set_object_procedure_x);
for (i = 0; i < 4; ++i)
proc[i] = SCM_BOOL_F;
i = 0;
while (SCM_NIMP (procs))
{
if (i == 4)
scm_wrong_num_args (scm_makfrom0str (s_set_object_procedure_x));
p = SCM_CAR (procs);
setp = 0;
SCM_ASSERT (SCM_NIMP (p), p, SCM_ARG2 + i, s_set_object_procedure_x);
if (SCM_CLOSUREP (p))
{
arity = scm_procedure_property (p, scm_sym_arity);
a = SCM_INUM (SCM_CAR (arity));
/* Closures have zero optional args */
r = SCM_NFALSEP (SCM_CADDR (arity));
if (a == 1 || (a <= 1 && r))
{
if (SCM_NFALSEP (proc[0]))
goto ambiguous;
proc[0] = setp = p;
}
if (a == 2 || (a <= 2 && r))
{
if (SCM_NFALSEP (proc[1]))
goto ambiguous;
proc[1] = setp = p;
}
if (a == 3 || (a <= 3 && r))
{
if (SCM_NFALSEP (proc[2]))
goto ambiguous;
proc[2] = setp = p;
}
if (a <= 4 && r)
{
if (SCM_NFALSEP (proc[3]))
goto ambiguous;
proc[3] = setp = p;
}
}
else if (SCM_TYP7 (p) == scm_tc7_subr_1)
{
if (SCM_NFALSEP (proc[0]))
goto ambiguous;
proc[0] = setp = p;
}
else if (SCM_TYP7 (p) == scm_tc7_subr_2)
{
if (SCM_NFALSEP (proc[1]))
goto ambiguous;
proc[1] = setp = p;
}
else if (SCM_TYP7 (p) == scm_tc7_subr_3)
{
if (SCM_NFALSEP (proc[2]))
goto ambiguous;
proc[2] = setp = p;
}
else if (SCM_TYP7 (p) == scm_tc7_lsubr_2)
{
if (SCM_NFALSEP (proc[3]))
{
ambiguous:
SCM_ASSERT (0, p, "Ambiguous procedure arities",
s_set_object_procedure_x);
}
proc[3] = setp = p;
}
SCM_ASSERT (setp, p, SCM_ARG2 + i, s_set_object_procedure_x);
++i;
procs = SCM_CDR (procs);
}
pp = (SCM_I_ENTITYP (obj)
? &SCM_ENTITY_PROC_0 (obj)
: &SCM_OPERATOR_CLASS (obj)->proc0);
for (i = 0; i < 4; ++i)
*pp++ = proc[i];
return SCM_UNSPECIFIED;
}
static SCM
make_class_object (SCM meta,
SCM pl,
SCM layout,
unsigned long flags,
char* subr)
{
SCM c;
SCM_ASSERT (SCM_NIMP (meta) && SCM_STRUCTP (meta), meta, SCM_ARG1, subr);
SCM_ASSERT (SCM_NIMP (layout) && SCM_STRINGP (layout),
layout,
SCM_ARG2,
subr);
layout = scm_make_struct_layout (scm_string_append (SCM_LIST2 (pl, layout)));
c = scm_make_struct (meta,
SCM_INUM0,
SCM_LIST4 (layout, SCM_BOOL_F, SCM_EOL, SCM_EOL));
SCM_SET_CLASS_FLAGS (c, flags);
return c;
}
SCM_PROC (s_make_class_object, "make-class-object", 2, 0, 0, scm_make_class_object);
SCM
scm_make_class_object (SCM metaclass, SCM layout)
{
unsigned long flags = 0;
if (metaclass == scm_metaclass_operator)
flags = SCM_CLASSF_OPERATOR;
return make_class_object (metaclass,
scm_nullstr,
layout,
flags,
s_make_class_object);
}
SCM_PROC (s_make_subclass_object, "make-subclass-object", 2, 0, 0, scm_make_subclass_object);
SCM
scm_make_subclass_object (SCM class, SCM layout)
{
SCM pl;
SCM_ASSERT (SCM_NIMP (class) && SCM_STRUCTP (class),
class,
SCM_ARG1,
s_make_subclass_object);
pl = SCM_STRUCT_DATA (class)[scm_vtable_index_layout];
pl = scm_makfromstr (SCM_CHARS (pl), (scm_sizet) SCM_LENGTH (pl), 0);
return make_class_object (scm_metaclass_standard,
pl,
layout,
SCM_CLASS_FLAGS (class),
s_make_subclass_object);
}
void
scm_init_objects ()
{
SCM ms = scm_makfrom0str (SCM_METACLASS_STANDARD_LAYOUT);
SCM ml = scm_make_struct_layout (ms);
SCM mt = scm_make_vtable_vtable (ml, SCM_INUM0,
SCM_LIST3 (SCM_BOOL_F, SCM_EOL, SCM_EOL));
SCM os = scm_makfrom0str (SCM_METACLASS_OPERATOR_LAYOUT);
SCM ol = scm_make_struct_layout (os);
SCM ot = scm_make_vtable_vtable (ol, SCM_INUM0,
SCM_LIST3 (SCM_BOOL_F, SCM_EOL, SCM_EOL));
SCM es = scm_makfrom0str (SCM_ENTITY_LAYOUT);
SCM el = scm_make_struct_layout (es);
SCM et = scm_make_struct (mt, SCM_INUM0,
SCM_LIST4 (el, SCM_BOOL_F, SCM_EOL, SCM_EOL));
scm_sysintern ("<standard-metaclass>", mt);
scm_metaclass_standard = mt;
scm_sysintern ("<operator-metaclass>", ot);
scm_metaclass_operator = ot;
SCM_SET_CLASS_FLAGS (et, SCM_CLASSF_OPERATOR | SCM_CLASSF_ENTITY);
scm_sysintern ("<entity-class>", et);
#include "objects.x"
}
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