libguile/hooks.h

   1 /* classes: h_files */
   2
   3 #ifndef SCM_HOOKS_H
   4 #define SCM_HOOKS_H
   5
   6 /* Copyright (C) 1995,1996,1999,2000,2001, 2006, 2008 Free Software Foundation, Inc.
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 \f
  24
  25 #include "libguile/__scm.h"
  26
  27 /*
  28  * C level hooks
  29  */
  30
  31 /*
  32  * The interface is designed for and- and or-type hooks which
  33  * both may want to indicate success/failure and return a result.
  34  */
  35
  36 typedef enum scm_t_c_hook_type {
  37   SCM_C_HOOK_NORMAL,
  38   SCM_C_HOOK_OR,
  39   SCM_C_HOOK_AND
  40 } scm_t_c_hook_type;
  41
  42 typedef void  *(*scm_t_c_hook_function) (void *hook_data,
  43                                          void *fn_data,
  44                                          void *data);
  45
  46 typedef struct scm_t_c_hook_entry {
  47   struct scm_t_c_hook_entry *next;
  48   scm_t_c_hook_function func;
  49   void *data;
  50 } scm_t_c_hook_entry;
  51
  52 typedef struct scm_t_c_hook {
  53   scm_t_c_hook_entry *first;
  54   scm_t_c_hook_type type;
  55   void *data;
  56 } scm_t_c_hook;
  57
  58 SCM_API void scm_c_hook_init (scm_t_c_hook *hook,
  59                               void *hook_data,
  60                               scm_t_c_hook_type type);
  61 SCM_API void scm_c_hook_add (scm_t_c_hook *hook,
  62                              scm_t_c_hook_function func,
  63                              void *fn_data,
  64                              int appendp);
  65 SCM_API void scm_c_hook_remove (scm_t_c_hook *hook,
  66                                 scm_t_c_hook_function func,
  67                                 void *fn_data);
  68 SCM_API void *scm_c_hook_run (scm_t_c_hook *hook, void *data);
  69
  70 /*
  71  * Scheme level hooks
  72  */
  73
  74 SCM_API scm_t_bits scm_tc16_hook;
  75
  76 #define SCM_HOOKP(x)                    SCM_SMOB_PREDICATE (scm_tc16_hook, x)
  77 #define SCM_HOOK_ARITY(hook)            SCM_SMOB_FLAGS (hook)
  78 #define SCM_HOOK_PROCEDURES(hook)       SCM_SMOB_OBJECT (hook)
  79 #define SCM_SET_HOOK_PROCEDURES(hook, procs) SCM_SET_SMOB_OBJECT ((hook), (procs))
  80
  81 SCM_API SCM scm_make_hook (SCM n_args);
  82 SCM_API SCM scm_hook_p (SCM x);
  83 SCM_API SCM scm_hook_empty_p (SCM hook);
  84 SCM_API SCM scm_add_hook_x (SCM hook, SCM thunk, SCM appendp);
  85 SCM_API SCM scm_remove_hook_x (SCM hook, SCM thunk);
  86 SCM_API SCM scm_reset_hook_x (SCM hook);
  87 SCM_API SCM scm_run_hook (SCM hook, SCM args);
  88 SCM_API void scm_c_run_hook (SCM hook, SCM args);
  89 SCM_API SCM scm_hook_to_list (SCM hook);
  90 SCM_INTERNAL void scm_init_hooks (void);
  91
  92 #endif  /* SCM_HOOKS_H */
  93
  94 /*
  95   Local Variables:
  96   c-file-style: "gnu"
  97   End:
  98 */