/* Copyright (C) 1995,1996,1998,2000,2001 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. */ #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" 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_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_EQ_P (SCM_CCLO_SUBR (proc), scm_f_gsubr_apply)) { int type = SCM_INUM (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_NULLP (proc)) break; while (SCM_CONSP (proc)) { ++a; proc = SCM_CDR (proc); } if (!SCM_NULLP (proc)) r = 1; break; case scm_tcs_cons_gloc: 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_MAKINUM (a), SCM_MAKINUM (o), SCM_BOOL(r)); } static SCM scm_stand_in_scm_proc(SCM proc) { SCM handle, answer; handle = scm_hashq_get_handle (scm_stand_in_procs, proc); if (SCM_FALSEP (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_EQ_P (k, scm_sym_arity)) { SCM arity; SCM_ASSERT (SCM_NFALSEP (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_EQ_P (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 void scm_init_procprop () { #include "libguile/procprop.x" } /* Local Variables: c-file-style: "gnu" End: */