--- /dev/null
+/* Copyright (C) 1995,1996,1998,2000,2001,2003,2004, 2006, 2008 Free Software Foundation, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+
+\f
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "libguile/_scm.h"
+
+#include "libguile/alist.h"
+#include "libguile/eval.h"
+#include "libguile/procs.h"
+#include "libguile/gsubr.h"
+#include "libguile/objects.h"
+#include "libguile/smob.h"
+#include "libguile/root.h"
+#include "libguile/vectors.h"
+#include "libguile/hashtab.h"
+
+#include "libguile/validate.h"
+#include "libguile/procprop.h"
+\f
+
+SCM_GLOBAL_SYMBOL (scm_sym_system_procedure, "system-procedure");
+SCM_GLOBAL_SYMBOL (scm_sym_arity, "arity");
+
+SCM
+scm_i_procedure_arity (SCM proc)
+{
+ int a = 0, o = 0, r = 0;
+ if (SCM_IMP (proc))
+ return SCM_BOOL_F;
+ loop:
+ switch (SCM_TYP7 (proc))
+ {
+ case scm_tc7_subr_1o:
+ o = 1;
+ case scm_tc7_subr_0:
+ break;
+ case scm_tc7_subr_2o:
+ o = 1;
+ case scm_tc7_subr_1:
+ case scm_tc7_dsubr:
+ case scm_tc7_cxr:
+ a += 1;
+ break;
+ case scm_tc7_subr_2:
+ a += 2;
+ break;
+ case scm_tc7_subr_3:
+ a += 3;
+ break;
+ case scm_tc7_asubr:
+ case scm_tc7_rpsubr:
+ case scm_tc7_lsubr:
+ r = 1;
+ break;
+ case scm_tc7_lsubr_2:
+ a += 2;
+ r = 1;
+ break;
+ case scm_tc7_smob:
+ if (SCM_SMOB_APPLICABLE_P (proc))
+ {
+ int type = SCM_SMOB_DESCRIPTOR (proc).gsubr_type;
+ a += SCM_GSUBR_REQ (type);
+ o = SCM_GSUBR_OPT (type);
+ r = SCM_GSUBR_REST (type);
+ break;
+ }
+ else
+ {
+ return SCM_BOOL_F;
+ }
+ case scm_tc7_cclo:
+ if (scm_is_eq (SCM_CCLO_SUBR (proc), scm_f_gsubr_apply))
+ {
+ int type = scm_to_int (SCM_GSUBR_TYPE (proc));
+ a += SCM_GSUBR_REQ (type);
+ o = SCM_GSUBR_OPT (type);
+ r = SCM_GSUBR_REST (type);
+ break;
+ }
+ else
+ {
+ proc = SCM_CCLO_SUBR (proc);
+ a -= 1;
+ goto loop;
+ }
+ case scm_tc7_pws:
+ proc = SCM_PROCEDURE (proc);
+ goto loop;
+ case scm_tcs_closures:
+ proc = SCM_CLOSURE_FORMALS (proc);
+ if (scm_is_null (proc))
+ break;
+ while (scm_is_pair (proc))
+ {
+ ++a;
+ proc = SCM_CDR (proc);
+ }
+ if (!scm_is_null (proc))
+ r = 1;
+ break;
+ case scm_tcs_struct:
+ if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC)
+ {
+ r = 1;
+ break;
+ }
+ else if (!SCM_I_OPERATORP (proc))
+ return SCM_BOOL_F;
+ proc = (SCM_I_ENTITYP (proc)
+ ? SCM_ENTITY_PROCEDURE (proc)
+ : SCM_OPERATOR_PROCEDURE (proc));
+ a -= 1;
+ goto loop;
+ default:
+ return SCM_BOOL_F;
+ }
+ return scm_list_3 (scm_from_int (a), scm_from_int (o), scm_from_bool(r));
+}
+
+/* XXX - instead of using a stand-in value for everything except
+ closures, we should find other ways to store the procedure
+ properties for those other kinds of procedures. For example, subrs
+ have their own property slot, which is unused at present.
+*/
+
+static SCM
+scm_stand_in_scm_proc(SCM proc)
+{
+ SCM handle, answer;
+ handle = scm_hashq_get_handle (scm_stand_in_procs, proc);
+ if (scm_is_false (handle))
+ {
+ answer = scm_closure (scm_list_2 (SCM_EOL, SCM_BOOL_F), SCM_EOL);
+ scm_hashq_set_x (scm_stand_in_procs, proc, answer);
+ }
+ else
+ answer = SCM_CDR (handle);
+ return answer;
+}
+
+SCM_DEFINE (scm_procedure_properties, "procedure-properties", 1, 0, 0,
+ (SCM proc),
+ "Return @var{obj}'s property list.")
+#define FUNC_NAME s_scm_procedure_properties
+{
+ SCM_VALIDATE_PROC (1, proc);
+ return scm_acons (scm_sym_arity, scm_i_procedure_arity (proc),
+ SCM_PROCPROPS (SCM_CLOSUREP (proc)
+ ? proc
+ : scm_stand_in_scm_proc (proc)));
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_set_procedure_properties_x, "set-procedure-properties!", 2, 0, 0,
+ (SCM proc, SCM new_val),
+ "Set @var{obj}'s property list to @var{alist}.")
+#define FUNC_NAME s_scm_set_procedure_properties_x
+{
+ if (!SCM_CLOSUREP (proc))
+ proc = scm_stand_in_scm_proc(proc);
+ SCM_VALIDATE_CLOSURE (1, proc);
+ SCM_SETPROCPROPS (proc, new_val);
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_procedure_property, "procedure-property", 2, 0, 0,
+ (SCM p, SCM k),
+ "Return the property of @var{obj} with name @var{key}.")
+#define FUNC_NAME s_scm_procedure_property
+{
+ SCM assoc;
+ if (scm_is_eq (k, scm_sym_arity))
+ {
+ SCM arity;
+ SCM_ASSERT (scm_is_true (arity = scm_i_procedure_arity (p)),
+ p, SCM_ARG1, FUNC_NAME);
+ return arity;
+ }
+ SCM_VALIDATE_PROC (1, p);
+ assoc = scm_sloppy_assq (k,
+ SCM_PROCPROPS (SCM_CLOSUREP (p)
+ ? p
+ : scm_stand_in_scm_proc (p)));
+ return (SCM_NIMP (assoc) ? SCM_CDR (assoc) : SCM_BOOL_F);
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_set_procedure_property_x, "set-procedure-property!", 3, 0, 0,
+ (SCM p, SCM k, SCM v),
+ "In @var{obj}'s property list, set the property named @var{key} to\n"
+ "@var{value}.")
+#define FUNC_NAME s_scm_set_procedure_property_x
+{
+ SCM assoc;
+ if (!SCM_CLOSUREP (p))
+ p = scm_stand_in_scm_proc(p);
+ SCM_VALIDATE_CLOSURE (1, p);
+ if (scm_is_eq (k, scm_sym_arity))
+ SCM_MISC_ERROR ("arity is a read-only property", SCM_EOL);
+ assoc = scm_sloppy_assq (k, SCM_PROCPROPS (p));
+ if (SCM_NIMP (assoc))
+ SCM_SETCDR (assoc, v);
+ else
+ SCM_SETPROCPROPS (p, scm_acons (k, v, SCM_PROCPROPS (p)));
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+\f
+
+
+void
+scm_init_procprop ()
+{
+#include "libguile/procprop.x"
+}
+
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/
projects / lilypond.git / blobdiff