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Diffstat (limited to 'libguile/variable.c')
| -rw-r--r-- | libguile/variable.c | 282 |
1 files changed, 282 insertions, 0 deletions
diff --git a/libguile/variable.c b/libguile/variable.c new file mode 100644 index 000000000..984de26db --- /dev/null +++ b/libguile/variable.c @@ -0,0 +1,282 @@ +/* Copyright (C) 1995,1996 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, 675 Mass Ave, Cambridge, MA 02139, 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. + */ + + +#include <stdio.h> +#include "_scm.h" + + +#ifdef __STDC__ +static scm_sizet +free_var (SCM obj) +#else +static scm_sizet +free_var (obj) + SCM obj; +#endif +{ + return 0; +} + + +#ifdef __STDC__ +static int +prin_var (SCM exp, SCM port, int writing) +#else +static int +prin_var (exp, port, writing) + SCM exp; + SCM port; + int writing; +#endif +{ + scm_gen_puts (scm_regular_string, "#<variable ", port); + scm_intprint(exp, 16, port); + { + SCM val_cell; + val_cell = SCM_CDR(exp); + if (SCM_CAR (val_cell) != SCM_UNDEFINED) + { + scm_gen_puts (scm_regular_string, " name: ", port); + scm_iprin1 (SCM_CAR (val_cell), port, writing); + } + scm_gen_puts (scm_regular_string, " binding: ", port); + scm_iprin1 (SCM_CDR (val_cell), port, writing); + } + scm_gen_putc('>', port); + return 1; +} + +#ifdef __STDC__ +static SCM +scm_markvar (SCM ptr) +#else +static SCM +scm_markvar (ptr) + SCM ptr; +#endif +{ + if (SCM_GC8MARKP (ptr)) + return SCM_BOOL_F; + SCM_SETGC8MARK (ptr); + return SCM_CDR (ptr); +} + +int scm_tc16_variable; +static scm_smobfuns variable_smob = {scm_markvar, free_var, prin_var, 0}; + + +static SCM variable_sym; + +#ifdef __STDC__ +static SCM +make_vcell_variable (SCM vcell) +#else +static SCM +make_vcell_variable (vcell) + SCM vcell; +#endif +{ + SCM answer; + SCM_NEWCELL(answer); + SCM_REDEFER_INTS; + SCM_CAR(answer) = scm_tc16_variable; + SCM_CDR(answer) = vcell; + SCM_REALLOW_INTS; + return answer; +} + +SCM_PROC(s_make_variable, "make-variable", 2, 0, 0, scm_make_variable); +#ifdef __STDC__ +SCM +scm_make_variable (SCM init, SCM name_hint) +#else +SCM +scm_make_variable (init, name_hint) + SCM init; + SCM name_hint; +#endif +{ + SCM val_cell; + SCM_NEWCELL(val_cell); + SCM_DEFER_INTS; + SCM_CAR(val_cell) = name_hint; + SCM_CDR(val_cell) = init; + SCM_ALLOW_INTS; + return make_vcell_variable (val_cell); +} + + +SCM_PROC(s_make_undefined_variable, "make-undefined-variable", 0, 1, 0, scm_make_undefined_variable); +#ifdef __STDC__ +SCM +scm_make_undefined_variable (SCM name_hint) +#else +SCM +scm_make_undefined_variable (name_hint) + SCM name_hint; +#endif +{ + SCM vcell; + + if (name_hint == SCM_UNDEFINED) + name_hint = variable_sym; + + SCM_NEWCELL (vcell); + SCM_DEFER_INTS; + SCM_CAR (vcell) = name_hint; + SCM_CDR (vcell) = SCM_UNDEFINED; + SCM_ALLOW_INTS; + return make_vcell_variable (vcell); +} + + +SCM_PROC(s_variable_p, "variable?", 1, 0, 0, scm_variable_p); +#ifdef __STDC__ +SCM +scm_variable_p (SCM obj) +#else +SCM +scm_variable_p (obj) + SCM obj; +#endif +{ + return ( (SCM_NIMP(obj) && SCM_VARIABLEP (obj)) + ? SCM_BOOL_T + : SCM_BOOL_F); +} + + +SCM_PROC(s_variable_ref, "variable-ref", 1, 0, 0, scm_variable_ref); +#ifdef __STDC__ +SCM +scm_variable_ref (SCM var) +#else +SCM +scm_variable_ref (var) + SCM var; +#endif +{ + SCM_ASSERT (SCM_NIMP(var) && SCM_VARIABLEP(var), var, SCM_ARG1, s_variable_ref); + return SCM_CDR (SCM_CDR (var)); +} + + + +SCM_PROC(s_variable_set_x, "variable-set!", 2, 0, 0, scm_variable_set_x); +#ifdef __STDC__ +SCM +scm_variable_set_x (SCM var, SCM val) +#else +SCM +scm_variable_set_x (var, val) + SCM var; + SCM val; +#endif +{ + SCM_ASSERT (SCM_NIMP(var) && SCM_VARIABLEP (var), var, SCM_ARG1, s_variable_set_x); + SCM_CDR (SCM_CDR (var)) = val; + return SCM_UNSPECIFIED; +} + + +SCM_PROC(s_builtin_variable, "builtin-variable", 1, 0, 0, scm_builtin_variable); +#ifdef __STDC__ +SCM +scm_builtin_variable (SCM name) +#else +SCM +scm_builtin_variable (name) + SCM name; +#endif +{ + SCM vcell; + SCM var_slot; + + SCM_ASSERT (SCM_NIMP (name) && SCM_SYMBOLP (name), name, SCM_ARG1, s_builtin_variable); + vcell = scm_sym2vcell (name, SCM_BOOL_F, SCM_BOOL_T); + if (vcell == SCM_BOOL_F) + return SCM_BOOL_F; + + scm_intern_symbol (scm_symhash_vars, name); + var_slot = scm_sym2ovcell (name, scm_symhash_vars); + + SCM_DEFER_INTS; + if ( SCM_IMP (SCM_CDR (var_slot)) + || (SCM_VARVCELL (var_slot) != vcell)) + SCM_CDR (var_slot) = make_vcell_variable (vcell); + SCM_ALLOW_INTS; + + return SCM_CDR (var_slot); +} + + +SCM_PROC(s_variable_bound_p, "variable-bound?", 1, 0, 0, scm_variable_bound_p); +#ifdef __STDC__ +SCM +scm_variable_bound_p (SCM var) +#else +SCM +scm_variable_bound_p (var) + SCM var; +#endif +{ + SCM_ASSERT (SCM_NIMP(var) && SCM_VARIABLEP (var), var, SCM_ARG1, s_variable_bound_p); + return (SCM_UNBNDP (SCM_CDR (SCM_VARVCELL (var))) + ? SCM_BOOL_F + : SCM_BOOL_T); +} + + + +#ifdef __STDC__ +void +scm_init_variable (void) +#else +void +scm_init_variable () +#endif +{ + scm_tc16_variable = scm_newsmob (&variable_smob); + variable_sym = SCM_CAR (scm_sysintern ("anonymous-variable", SCM_UNDEFINED)); +#include "variable.x" +} + |