libguile/procs.c

   1 /* Copyright (C) 1995, 1996, 1997, 1999, 2000, 2001, 2006, 2008, 2009,
   2  *   2010, 2011, 2012, 2013 Free Software Foundation, Inc.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public License
   6  * as published by the Free Software Foundation; either version 3 of
   7  * the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17  * 02110-1301 USA
  18  */
  19
  20
  21 \f
  22 #ifdef HAVE_CONFIG_H
  23 # include <config.h>
  24 #endif
  25
  26 #include "libguile/_scm.h"
  27
  28 #include "libguile/strings.h"
  29 #include "libguile/vectors.h"
  30 #include "libguile/smob.h"
  31 #include "libguile/deprecation.h"
  32
  33 #include "libguile/validate.h"
  34 #include "libguile/procs.h"
  35 #include "libguile/procprop.h"
  36 #include "libguile/objcodes.h"
  37 #include "libguile/programs.h"
  38 \f
  39
  40
  41 /* {Procedures}
  42  */
  43
  44
  45 SCM_DEFINE (scm_procedure_p, "procedure?", 1, 0, 0,
  46             (SCM obj),
  47             "Return @code{#t} if @var{obj} is a procedure.")
  48 #define FUNC_NAME s_scm_procedure_p
  49 {
  50   return scm_from_bool (SCM_PROGRAM_P (obj)
  51                         || SCM_RTL_PROGRAM_P (obj)
  52                         || (SCM_STRUCTP (obj) && SCM_STRUCT_APPLICABLE_P (obj))
  53                         || (SCM_HAS_TYP7 (obj, scm_tc7_smob)
  54                             && SCM_SMOB_APPLICABLE_P (obj)));
  55 }
  56 #undef FUNC_NAME
  57
  58 SCM_DEFINE (scm_thunk_p, "thunk?", 1, 0, 0,
  59             (SCM obj),
  60             "Return @code{#t} if @var{obj} is a thunk.")
  61 #define FUNC_NAME s_scm_thunk_p
  62 {
  63   int req, opt, rest;
  64   return scm_from_bool (scm_i_procedure_arity (obj, &req, &opt, &rest)
  65                         && req == 0);
  66 }
  67 #undef FUNC_NAME
  68
  69
  70 /* Procedure-with-setter
  71  */
  72
  73 static SCM pws_vtable;
  74
  75
  76 SCM_DEFINE (scm_procedure_with_setter_p, "procedure-with-setter?", 1, 0, 0,
  77             (SCM obj),
  78             "Return @code{#t} if @var{obj} is a procedure with an\n"
  79             "associated setter procedure.")
  80 #define FUNC_NAME s_scm_procedure_with_setter_p
  81 {
  82   return scm_from_bool (SCM_STRUCTP (obj) && SCM_STRUCT_SETTER_P (obj));
  83 }
  84 #undef FUNC_NAME
  85
  86 SCM_DEFINE (scm_make_procedure_with_setter, "make-procedure-with-setter", 2, 0, 0,
  87             (SCM procedure, SCM setter),
  88             "Create a new procedure which behaves like @var{procedure}, but\n"
  89             "with the associated setter @var{setter}.")
  90 #define FUNC_NAME s_scm_make_procedure_with_setter
  91 {
  92   SCM name, ret;
  93   SCM_VALIDATE_PROC (1, procedure);
  94   SCM_VALIDATE_PROC (2, setter);
  95   ret = scm_make_struct (pws_vtable, SCM_INUM0,
  96                          scm_list_2 (procedure, setter));
  97
  98   /* don't use procedure_name, because don't care enough to do a reverse
  99      lookup */
 100   name = scm_procedure_property (procedure, scm_sym_name);
 101   if (scm_is_true (name))
 102     scm_set_procedure_property_x (ret, scm_sym_name, name);
 103   return ret;
 104 }
 105 #undef FUNC_NAME
 106
 107 SCM_DEFINE (scm_procedure, "procedure", 1, 0, 0,
 108             (SCM proc),
 109             "Return the procedure of @var{proc}, which must be an\n"
 110             "applicable struct.")
 111 #define FUNC_NAME s_scm_procedure
 112 {
 113   SCM_ASSERT (SCM_STRUCTP (proc) && SCM_STRUCT_APPLICABLE_P (proc),
 114               proc, SCM_ARG1, FUNC_NAME);
 115   return SCM_STRUCT_PROCEDURE (proc);
 116 }
 117 #undef FUNC_NAME
 118
 119 SCM_PRIMITIVE_GENERIC (scm_setter, "setter", 1, 0, 0,
 120                        (SCM proc),
 121                        "Return the setter of @var{proc}, which must be an\n"
 122                        "applicable struct with a setter.")
 123 #define FUNC_NAME s_scm_setter
 124 {
 125   if (SCM_UNLIKELY (!SCM_STRUCTP (proc)))
 126     return scm_wta_dispatch_1 (g_scm_setter, proc, SCM_ARG1, FUNC_NAME);
 127   if (SCM_STRUCT_SETTER_P (proc))
 128     return SCM_STRUCT_SETTER (proc);
 129   if (SCM_PUREGENERICP (proc)
 130       && SCM_IS_A_P (proc, scm_class_generic_with_setter))
 131     /* FIXME: might not be an accessor */
 132     return SCM_GENERIC_SETTER (proc);
 133   return scm_wta_dispatch_1 (g_scm_setter, proc, SCM_ARG1, FUNC_NAME);
 134   return SCM_BOOL_F; /* not reached */
 135 }
 136 #undef FUNC_NAME
 137
 138 \f
 139 void
 140 scm_init_procs ()
 141 {
 142   pws_vtable =
 143     scm_c_make_struct (scm_applicable_struct_with_setter_vtable_vtable,
 144                        0,
 145                        1,
 146                        SCM_UNPACK (scm_from_latin1_symbol ("pwpw")));
 147
 148 #include "libguile/procs.x"
 149 }
 150
 151 /*
 152   Local Variables:
 153   c-file-style: "gnu"
 154   End:
 155 */