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/loader.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_STRUCTP (obj) && SCM_STRUCT_APPLICABLE_P (obj))
  52                         || (SCM_HAS_TYP7 (obj, scm_tc7_smob)
  53                             && SCM_SMOB_APPLICABLE_P (obj)));
  54 }
  55 #undef FUNC_NAME
  56
  57 SCM_DEFINE (scm_thunk_p, "thunk?", 1, 0, 0,
  58             (SCM obj),
  59             "Return @code{#t} if @var{obj} is a thunk.")
  60 #define FUNC_NAME s_scm_thunk_p
  61 {
  62   int req, opt, rest;
  63   return scm_from_bool (scm_i_procedure_arity (obj, &req, &opt, &rest)
  64                         && req == 0);
  65 }
  66 #undef FUNC_NAME
  67
  68
  69 /* Procedure-with-setter
  70  */
  71
  72 static SCM pws_vtable;
  73
  74
  75 SCM_DEFINE (scm_procedure_with_setter_p, "procedure-with-setter?", 1, 0, 0,
  76             (SCM obj),
  77             "Return @code{#t} if @var{obj} is a procedure with an\n"
  78             "associated setter procedure.")
  79 #define FUNC_NAME s_scm_procedure_with_setter_p
  80 {
  81   return scm_from_bool (SCM_STRUCTP (obj) && SCM_STRUCT_SETTER_P (obj));
  82 }
  83 #undef FUNC_NAME
  84
  85 SCM_DEFINE (scm_make_procedure_with_setter, "make-procedure-with-setter", 2, 0, 0,
  86             (SCM procedure, SCM setter),
  87             "Create a new procedure which behaves like @var{procedure}, but\n"
  88             "with the associated setter @var{setter}.")
  89 #define FUNC_NAME s_scm_make_procedure_with_setter
  90 {
  91   SCM_VALIDATE_PROC (1, procedure);
  92   SCM_VALIDATE_PROC (2, setter);
  93   return scm_make_struct (pws_vtable, SCM_INUM0,
  94                           scm_list_2 (procedure, setter));
  95 }
  96 #undef FUNC_NAME
  97
  98 SCM_DEFINE (scm_procedure, "procedure", 1, 0, 0,
  99             (SCM proc),
 100             "Return the procedure of @var{proc}, which must be an\n"
 101             "applicable struct.")
 102 #define FUNC_NAME s_scm_procedure
 103 {
 104   SCM_ASSERT (SCM_STRUCTP (proc) && SCM_STRUCT_APPLICABLE_P (proc),
 105               proc, SCM_ARG1, FUNC_NAME);
 106   return SCM_STRUCT_PROCEDURE (proc);
 107 }
 108 #undef FUNC_NAME
 109
 110 SCM_PRIMITIVE_GENERIC (scm_setter, "setter", 1, 0, 0,
 111                        (SCM proc),
 112                        "Return the setter of @var{proc}, which must be an\n"
 113                        "applicable struct with a setter.")
 114 #define FUNC_NAME s_scm_setter
 115 {
 116   if (SCM_UNLIKELY (!SCM_STRUCTP (proc)))
 117     return scm_wta_dispatch_1 (g_scm_setter, proc, SCM_ARG1, FUNC_NAME);
 118   if (SCM_STRUCT_SETTER_P (proc))
 119     return SCM_STRUCT_SETTER (proc);
 120   return scm_wta_dispatch_1 (g_scm_setter, proc, SCM_ARG1, FUNC_NAME);
 121 }
 122 #undef FUNC_NAME
 123
 124 \f
 125 void
 126 scm_init_procs ()
 127 {
 128   pws_vtable =
 129     scm_c_make_struct (scm_applicable_struct_with_setter_vtable_vtable,
 130                        0,
 131                        1,
 132                        SCM_UNPACK (scm_from_latin1_symbol ("pwpw")));
 133
 134 #include "libguile/procs.x"
 135 }
 136
 137 /*
 138   Local Variables:
 139   c-file-style: "gnu"
 140   End:
 141 */