1 /* Copyright (C) 1995,1996 Free Software Foundation, Inc.
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2, or (at your option)
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this software; see the file COPYING. If not, write to
15 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
17 * As a special exception, the Free Software Foundation gives permission
18 * for additional uses of the text contained in its release of GUILE.
20 * The exception is that, if you link the GUILE library with other files
21 * to produce an executable, this does not by itself cause the
22 * resulting executable to be covered by the GNU General Public License.
23 * Your use of that executable is in no way restricted on account of
24 * linking the GUILE library code into it.
26 * This exception does not however invalidate any other reasons why
27 * the executable file might be covered by the GNU General Public License.
29 * This exception applies only to the code released by the
30 * Free Software Foundation under the name GUILE. If you copy
31 * code from other Free Software Foundation releases into a copy of
32 * GUILE, as the General Public License permits, the exception does
33 * not apply to the code that you add in this way. To avoid misleading
34 * anyone as to the status of such modified files, you must delete
35 * this exception notice from them.
37 * If you write modifications of your own for GUILE, it is your choice
38 * whether to permit this exception to apply to your modifications.
39 * If you do not wish that, delete this exception notice.
52 static scm_sizet free_var
SCM_P ((SCM obj
));
63 static int prin_var
SCM_P ((SCM exp
, SCM port
, scm_print_state
*pstate
));
66 prin_var (exp
, port
, pstate
)
69 scm_print_state
*pstate
;
71 scm_gen_puts (scm_regular_string
, "#<variable ", port
);
72 scm_intprint(exp
, 16, port
);
75 val_cell
= SCM_CDR(exp
);
76 if (SCM_CAR (val_cell
) != SCM_UNDEFINED
)
78 scm_gen_puts (scm_regular_string
, " name: ", port
);
79 scm_iprin1 (SCM_CAR (val_cell
), port
, pstate
);
81 scm_gen_puts (scm_regular_string
, " binding: ", port
);
82 scm_iprin1 (SCM_CDR (val_cell
), port
, pstate
);
84 scm_gen_putc('>', port
);
89 static SCM scm_markvar
SCM_P ((SCM ptr
));
95 if (SCM_GC8MARKP (ptr
))
101 static SCM var_equal
SCM_P ((SCM var1
, SCM var2
));
104 var_equal (var1
, var2
)
108 return scm_equal_p (SCM_CDR (var1
), SCM_CDR (var2
));
111 int scm_tc16_variable
;
112 static scm_smobfuns variable_smob
= {scm_markvar
, free_var
, prin_var
, var_equal
};
115 static SCM anonymous_variable_sym
;
118 static SCM make_vcell_variable
SCM_P ((SCM vcell
));
121 make_vcell_variable (vcell
)
127 SCM_SETCAR (answer
, scm_tc16_variable
);
128 SCM_SETCDR (answer
, vcell
);
133 SCM_PROC(s_make_variable
, "make-variable", 1, 1, 0, scm_make_variable
);
136 scm_make_variable (init
, name_hint
)
142 if (name_hint
== SCM_UNDEFINED
)
143 name_hint
= anonymous_variable_sym
;
145 SCM_NEWCELL(val_cell
);
147 SCM_SETCAR (val_cell
, name_hint
);
148 SCM_SETCDR (val_cell
, init
);
150 return make_vcell_variable (val_cell
);
154 SCM_PROC(s_make_undefined_variable
, "make-undefined-variable", 0, 1, 0, scm_make_undefined_variable
);
157 scm_make_undefined_variable (name_hint
)
162 if (name_hint
== SCM_UNDEFINED
)
163 name_hint
= anonymous_variable_sym
;
167 SCM_SETCAR (vcell
, name_hint
);
168 SCM_SETCDR (vcell
, SCM_UNDEFINED
);
170 return make_vcell_variable (vcell
);
174 SCM_PROC(s_variable_p
, "variable?", 1, 0, 0, scm_variable_p
);
180 return ( (SCM_NIMP(obj
) && SCM_VARIABLEP (obj
))
186 SCM_PROC(s_variable_ref
, "variable-ref", 1, 0, 0, scm_variable_ref
);
189 scm_variable_ref (var
)
192 SCM_ASSERT (SCM_NIMP(var
) && SCM_VARIABLEP(var
), var
, SCM_ARG1
, s_variable_ref
);
193 return SCM_CDR (SCM_CDR (var
));
198 SCM_PROC(s_variable_set_x
, "variable-set!", 2, 0, 0, scm_variable_set_x
);
201 scm_variable_set_x (var
, val
)
205 SCM_ASSERT (SCM_NIMP(var
) && SCM_VARIABLEP (var
), var
, SCM_ARG1
, s_variable_set_x
);
206 SCM_SETCDR (SCM_CDR (var
), val
);
207 return SCM_UNSPECIFIED
;
211 SCM_PROC(s_builtin_variable
, "builtin-variable", 1, 0, 0, scm_builtin_variable
);
214 scm_builtin_variable (name
)
220 SCM_ASSERT (SCM_NIMP (name
) && SCM_SYMBOLP (name
), name
, SCM_ARG1
, s_builtin_variable
);
221 vcell
= scm_sym2vcell (name
, SCM_BOOL_F
, SCM_BOOL_T
);
222 if (vcell
== SCM_BOOL_F
)
225 scm_intern_symbol (scm_symhash_vars
, name
);
226 var_slot
= scm_sym2ovcell (name
, scm_symhash_vars
);
229 if ( SCM_IMP (SCM_CDR (var_slot
))
230 || (SCM_VARVCELL (var_slot
) != vcell
))
231 SCM_SETCDR (var_slot
, make_vcell_variable (vcell
));
234 return SCM_CDR (var_slot
);
238 SCM_PROC(s_variable_bound_p
, "variable-bound?", 1, 0, 0, scm_variable_bound_p
);
241 scm_variable_bound_p (var
)
244 SCM_ASSERT (SCM_NIMP(var
) && SCM_VARIABLEP (var
), var
, SCM_ARG1
, s_variable_bound_p
);
245 return (SCM_UNBNDP (SCM_CDR (SCM_VARVCELL (var
)))
256 scm_tc16_variable
= scm_newsmob (&variable_smob
);
257 anonymous_variable_sym
= SCM_CAR (scm_sysintern ("anonymous-variable", SCM_UNDEFINED
));
258 #include "variable.x"