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/* Copyright (C) 1995,1996,1998,1999,2000,2001, 2003, 2006 Free Software Foundation, Inc.
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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#include "libguile/_scm.h"
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#include "libguile/eval.h"
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#include "libguile/ports.h"
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#include "libguile/procprop.h"
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#include "libguile/root.h"
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#include "libguile/smob.h"
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#include "libguile/strings.h"
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#include "libguile/validate.h"
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#include "libguile/hooks.h"
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* Currently, this implementation is separate from the Scheme level
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* hooks. The possibility exists to implement the Scheme level hooks
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* using C level hooks.
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scm_c_hook_init (scm_t_c_hook *hook, void *hook_data, scm_t_c_hook_type type)
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hook->data = hook_data;
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scm_c_hook_add (scm_t_c_hook *hook,
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scm_t_c_hook_function func,
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scm_t_c_hook_entry *entry = scm_malloc (sizeof (scm_t_c_hook_entry));
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scm_t_c_hook_entry **loc = &hook->first;
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entry->data = func_data;
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scm_c_hook_remove (scm_t_c_hook *hook,
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scm_t_c_hook_function func,
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scm_t_c_hook_entry **loc = &hook->first;
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if ((*loc)->func == func && (*loc)->data == func_data)
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scm_t_c_hook_entry *entry = *loc;
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fprintf (stderr, "Attempt to remove non-existent hook function\n");
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scm_c_hook_run (scm_t_c_hook *hook, void *data)
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scm_t_c_hook_entry *entry = hook->first;
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scm_t_c_hook_type type = hook->type;
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res = (entry->func) (hook->data, entry->data, data);
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if (type == SCM_C_HOOK_OR)
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if (type == SCM_C_HOOK_AND)
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/* Scheme level hooks
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* A hook is basically a list of procedures to be called at well defined
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* Hook arity is not a full member of this type and therefore lacks an
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* accessor. It exists to aid debugging and is not intended to be used in
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scm_t_bits scm_tc16_hook;
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hook_print (SCM hook, SCM port, scm_print_state *pstate)
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scm_puts ("#<hook ", port);
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scm_intprint (SCM_HOOK_ARITY (hook), 10, port);
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scm_putc (' ', port);
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scm_uintprint (SCM_UNPACK (hook), 16, port);
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ls = SCM_HOOK_PROCEDURES (hook);
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while (SCM_NIMP (ls))
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scm_putc (' ', port);
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name = scm_procedure_name (SCM_CAR (ls));
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if (scm_is_true (name))
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scm_iprin1 (name, port, pstate);
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scm_putc ('?', port);
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scm_putc ('>', port);
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SCM_DEFINE (scm_make_hook, "make-hook", 0, 1, 0,
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"Create a hook for storing procedure of arity @var{n_args}.\n"
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"@var{n_args} defaults to zero. The returned value is a hook\n"
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"object to be used with the other hook procedures.")
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#define FUNC_NAME s_scm_make_hook
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if (SCM_UNBNDP (n_args))
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n = scm_to_unsigned_integer (n_args, 0, 16);
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SCM_RETURN_NEWSMOB (scm_tc16_hook + (n << 16), SCM_UNPACK (SCM_EOL));
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SCM_DEFINE (scm_hook_p, "hook?", 1, 0, 0,
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"Return @code{#t} if @var{x} is a hook, @code{#f} otherwise.")
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#define FUNC_NAME s_scm_hook_p
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return scm_from_bool (SCM_HOOKP (x));
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SCM_DEFINE (scm_hook_empty_p, "hook-empty?", 1, 0, 0,
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"Return @code{#t} if @var{hook} is an empty hook, @code{#f}\n"
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#define FUNC_NAME s_scm_hook_empty_p
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SCM_VALIDATE_HOOK (1, hook);
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return scm_from_bool (scm_is_null (SCM_HOOK_PROCEDURES (hook)));
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SCM_DEFINE (scm_add_hook_x, "add-hook!", 2, 1, 0,
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(SCM hook, SCM proc, SCM append_p),
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"Add the procedure @var{proc} to the hook @var{hook}. The\n"
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"procedure is added to the end if @var{append_p} is true,\n"
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"otherwise it is added to the front. The return value of this\n"
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"procedure is not specified.")
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#define FUNC_NAME s_scm_add_hook_x
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SCM_VALIDATE_HOOK (1, hook);
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SCM_ASSERT (scm_is_true (arity = scm_i_procedure_arity (proc)),
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proc, SCM_ARG2, FUNC_NAME);
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n_args = SCM_HOOK_ARITY (hook);
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if (scm_to_int (SCM_CAR (arity)) > n_args
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|| (scm_is_false (SCM_CADDR (arity))
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&& (scm_to_int (SCM_CAR (arity)) + scm_to_int (SCM_CADR (arity))
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scm_wrong_type_arg (FUNC_NAME, 2, proc);
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rest = scm_delq_x (proc, SCM_HOOK_PROCEDURES (hook));
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SCM_SET_HOOK_PROCEDURES (hook,
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(!SCM_UNBNDP (append_p) && scm_is_true (append_p)
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? scm_append_x (scm_list_2 (rest, scm_list_1 (proc)))
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: scm_cons (proc, rest)));
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return SCM_UNSPECIFIED;
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SCM_DEFINE (scm_remove_hook_x, "remove-hook!", 2, 0, 0,
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(SCM hook, SCM proc),
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"Remove the procedure @var{proc} from the hook @var{hook}. The\n"
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"return value of this procedure is not specified.")
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#define FUNC_NAME s_scm_remove_hook_x
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SCM_VALIDATE_HOOK (1, hook);
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SCM_SET_HOOK_PROCEDURES (hook,
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scm_delq_x (proc, SCM_HOOK_PROCEDURES (hook)));
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return SCM_UNSPECIFIED;
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SCM_DEFINE (scm_reset_hook_x, "reset-hook!", 1, 0, 0,
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"Remove all procedures from the hook @var{hook}. The return\n"
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"value of this procedure is not specified.")
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#define FUNC_NAME s_scm_reset_hook_x
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SCM_VALIDATE_HOOK (1, hook);
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SCM_SET_HOOK_PROCEDURES (hook, SCM_EOL);
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return SCM_UNSPECIFIED;
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SCM_DEFINE (scm_run_hook, "run-hook", 1, 0, 1,
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(SCM hook, SCM args),
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"Apply all procedures from the hook @var{hook} to the arguments\n"
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"@var{args}. The order of the procedure application is first to\n"
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"last. The return value of this procedure is not specified.")
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#define FUNC_NAME s_scm_run_hook
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SCM_VALIDATE_HOOK (1, hook);
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if (scm_ilength (args) != SCM_HOOK_ARITY (hook))
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SCM_MISC_ERROR ("Hook ~S requires ~A arguments",
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scm_list_2 (hook, scm_from_int (SCM_HOOK_ARITY (hook))));
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scm_c_run_hook (hook, args);
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return SCM_UNSPECIFIED;
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scm_c_run_hook (SCM hook, SCM args)
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SCM procs = SCM_HOOK_PROCEDURES (hook);
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while (SCM_NIMP (procs))
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scm_apply_0 (SCM_CAR (procs), args);
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procs = SCM_CDR (procs);
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SCM_DEFINE (scm_hook_to_list, "hook->list", 1, 0, 0,
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"Convert the procedure list of @var{hook} to a list.")
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#define FUNC_NAME s_scm_hook_to_list
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SCM_VALIDATE_HOOK (1, hook);
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return scm_list_copy (SCM_HOOK_PROCEDURES (hook));
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scm_tc16_hook = scm_make_smob_type ("hook", 0);
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scm_set_smob_mark (scm_tc16_hook, scm_markcdr);
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scm_set_smob_print (scm_tc16_hook, hook_print);
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#include "libguile/hooks.x"