/* Copyright (C) 1995, 1996, 1998, 1999 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. */ /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999, gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */ #include #include "_scm.h" #include "eval.h" #include "procprop.h" #include "smob.h" #include "scm_validate.h" #include "feature.h" #ifdef HAVE_STRING_H #include #endif static SCM *scm_loc_features; void scm_add_feature (const char *str) { *scm_loc_features = scm_cons (SCM_CAR (scm_intern (str, strlen (str))), *scm_loc_features); } SCM_DEFINE (scm_program_arguments, "program-arguments", 0, 0, 0, (), "") #define FUNC_NAME s_scm_program_arguments { return scm_progargs; } #undef FUNC_NAME /* Set the value returned by program-arguments, given ARGC and ARGV. If FIRST is non-zero, make it the first element; we do this in situations where other code (like getopt) has parsed out a few arguments, but we still want the script name to be the first element. */ void scm_set_program_arguments (int argc, char **argv, char *first) { scm_progargs = scm_makfromstrs (argc, argv); if (first) scm_progargs = scm_cons (scm_makfrom0str (first), scm_progargs); } /* Hooks * * A hook is basically a list of procedures to be called at well defined * points in time. * * Hook name and arity are not full members of this type and therefore * lack accessors. They are added to aid debugging and are not * intended to be used in programs. * */ long scm_tc16_hook; static SCM make_hook (SCM name, SCM n_args, const char *subr) { int n; SCM_ASSERT (SCM_FALSEP (name) || (SCM_SYMBOLP (name)), name, SCM_ARG1, subr); if (SCM_UNBNDP (n_args)) n = 0; else { SCM_ASSERT (SCM_INUMP (n_args), n_args, SCM_ARGn, subr); n = SCM_INUM (n_args); } SCM_ASSERT (n >= 0 && n <= 16, n_args, SCM_OUTOFRANGE, subr); SCM_RETURN_NEWSMOB (scm_tc16_hook + (n << 16), SCM_LIST1 (name)); } static int print_hook (SCM hook, SCM port, scm_print_state *pstate) { SCM ls, name; scm_puts ("#', port); return 1; } SCM scm_create_hook (const char* name, int n_args) { SCM vcell = scm_sysintern0 (name); SCM hook = make_hook (SCM_CAR (vcell), SCM_MAKINUM (n_args), "scm_create_hook"); SCM_SETCDR (vcell, hook); scm_protect_object (vcell); return hook; } /* This function is deprecated. It will be removed in next release. */ SCM scm_make_named_hook (const char* name, int n_args) { return scm_create_hook (name, n_args); } SCM_DEFINE (scm_make_hook_with_name, "make-hook-with-name", 1, 1, 0, (SCM name, SCM n_args), "") #define FUNC_NAME s_scm_make_hook_with_name { return make_hook (name, n_args, FUNC_NAME); } #undef FUNC_NAME SCM_DEFINE (scm_make_hook, "make-hook", 0, 1, 0, (SCM n_args), "") #define FUNC_NAME s_scm_make_hook { return make_hook (SCM_BOOL_F, n_args, FUNC_NAME); } #undef FUNC_NAME SCM_DEFINE (scm_hook_p, "hook?", 1, 0, 0, (SCM x), "") #define FUNC_NAME s_scm_hook_p { return SCM_BOOL(SCM_HOOKP (x)); } #undef FUNC_NAME SCM_DEFINE (scm_hook_empty_p, "hook-empty?", 1, 0, 0, (SCM hook), "") #define FUNC_NAME s_scm_hook_empty_p { SCM_VALIDATE_HOOK (1,hook); return SCM_BOOL(SCM_NULLP (SCM_HOOK_PROCEDURES (hook))); } #undef FUNC_NAME SCM_DEFINE (scm_add_hook_x, "add-hook!", 2, 1, 0, (SCM hook, SCM proc, SCM append_p), "") #define FUNC_NAME s_scm_add_hook_x { SCM arity, rest; int n_args; SCM_VALIDATE_HOOK (1,hook); SCM_ASSERT (SCM_NFALSEP (arity = scm_i_procedure_arity (proc)), proc, SCM_ARG2, FUNC_NAME); n_args = SCM_HOOK_ARITY (hook); if (SCM_INUM (SCM_CAR (arity)) > n_args || (SCM_FALSEP (SCM_CADDR (arity)) && (SCM_INUM (SCM_CAR (arity)) + SCM_INUM (SCM_CADR (arity)) < n_args))) scm_wrong_type_arg (FUNC_NAME, 2, proc); rest = scm_delq_x (proc, SCM_HOOK_PROCEDURES (hook)); SCM_SET_HOOK_PROCEDURES (hook, (!SCM_UNBNDP (append_p) && SCM_NFALSEP (append_p) ? scm_append_x (SCM_LIST2 (rest, SCM_LIST1 (proc))) : scm_cons (proc, rest))); return SCM_UNSPECIFIED; } #undef FUNC_NAME SCM_DEFINE (scm_remove_hook_x, "remove-hook!", 2, 0, 0, (SCM hook, SCM proc), "") #define FUNC_NAME s_scm_remove_hook_x { SCM_VALIDATE_HOOK (1,hook); SCM_SET_HOOK_PROCEDURES (hook, scm_delq_x (proc, SCM_HOOK_PROCEDURES (hook))); return SCM_UNSPECIFIED; } #undef FUNC_NAME SCM_DEFINE (scm_reset_hook_x, "reset-hook!", 1, 0, 0, (SCM hook), "") #define FUNC_NAME s_scm_reset_hook_x { SCM_VALIDATE_HOOK (1,hook); SCM_SET_HOOK_PROCEDURES (hook, SCM_EOL); return SCM_UNSPECIFIED; } #undef FUNC_NAME SCM_DEFINE (scm_run_hook, "run-hook", 1, 0, 1, (SCM hook, SCM args), "") #define FUNC_NAME s_scm_run_hook { SCM_VALIDATE_HOOK (1,hook); if (SCM_UNBNDP (args)) args = SCM_EOL; if (scm_ilength (args) != SCM_HOOK_ARITY (hook)) SCM_MISC_ERROR ("Hook ~S requires ~A arguments", SCM_LIST2 (hook,SCM_MAKINUM (SCM_HOOK_ARITY (hook)))); scm_c_run_hook (hook, args); return SCM_UNSPECIFIED; } #undef FUNC_NAME void scm_c_run_hook (SCM hook, SCM args) { SCM procs = SCM_HOOK_PROCEDURES (hook); while (SCM_NIMP (procs)) { scm_apply (SCM_CAR (procs), args, SCM_EOL); procs = SCM_CDR (procs); } } SCM_DEFINE (scm_hook_to_list, "hook->list", 1, 0, 0, (SCM hook), "") #define FUNC_NAME s_scm_hook_to_list { SCM_VALIDATE_HOOK (1,hook); return scm_list_copy (SCM_HOOK_PROCEDURES (hook)); } #undef FUNC_NAME void scm_init_feature() { scm_loc_features = SCM_CDRLOC (scm_sysintern ("*features*", SCM_EOL)); #ifdef SCM_RECKLESS scm_add_feature("reckless"); #endif #ifndef _Windows scm_add_feature("system"); #endif #ifdef vms scm_add_feature(s_ed); #endif #ifdef SICP scm_add_feature("sicp"); #endif #ifndef GO32 scm_add_feature("char-ready?"); #endif #ifndef CHEAP_CONTINUATIONS scm_add_feature ("full-continuation"); #endif #ifdef USE_THREADS scm_add_feature ("threads"); #endif scm_sysintern ("char-code-limit", SCM_MAKINUM (SCM_CHAR_CODE_LIMIT)); scm_tc16_hook = scm_make_smob_type ("hook", 0); scm_set_smob_mark (scm_tc16_hook, scm_markcdr); scm_set_smob_print (scm_tc16_hook, print_hook); #include "feature.x" }