1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
/* Copyright (C) 1995,1996,1997,1998,2000,2001, 2006, 2008, 2011 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 3 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "libguile/_scm.h"
#include "libguile/eq.h"
#include "libguile/ports.h"
#include "libguile/root.h"
#include "libguile/smob.h"
#include "libguile/deprecation.h"
#include "libguile/validate.h"
#include "libguile/variable.h"
void
scm_i_variable_print (SCM exp, SCM port, scm_print_state *pstate)
{
scm_puts_unlocked ("#<variable ", port);
scm_uintprint (SCM_UNPACK (exp), 16, port);
scm_puts_unlocked (" value: ", port);
scm_iprin1 (SCM_VARIABLE_REF (exp), port, pstate);
scm_putc_unlocked('>', port);
}
static SCM
make_variable (SCM init)
{
return scm_cell (scm_tc7_variable, SCM_UNPACK (init));
}
SCM_DEFINE (scm_make_variable, "make-variable", 1, 0, 0,
(SCM init),
"Return a variable initialized to value @var{init}.")
#define FUNC_NAME s_scm_make_variable
{
return make_variable (init);
}
#undef FUNC_NAME
SCM_DEFINE (scm_make_undefined_variable, "make-undefined-variable", 0, 0, 0,
(),
"Return a variable that is initially unbound.")
#define FUNC_NAME s_scm_make_undefined_variable
{
return make_variable (SCM_UNDEFINED);
}
#undef FUNC_NAME
SCM_DEFINE (scm_variable_p, "variable?", 1, 0, 0,
(SCM obj),
"Return @code{#t} iff @var{obj} is a variable object, else\n"
"return @code{#f}.")
#define FUNC_NAME s_scm_variable_p
{
return scm_from_bool (SCM_VARIABLEP (obj));
}
#undef FUNC_NAME
SCM_DEFINE (scm_variable_ref, "variable-ref", 1, 0, 0,
(SCM var),
"Dereference @var{var} and return its value.\n"
"@var{var} must be a variable object; see @code{make-variable}\n"
"and @code{make-undefined-variable}.")
#define FUNC_NAME s_scm_variable_ref
{
SCM val;
SCM_VALIDATE_VARIABLE (1, var);
val = SCM_VARIABLE_REF (var);
if (scm_is_eq (val, SCM_UNDEFINED))
SCM_MISC_ERROR ("variable is unbound: ~S", scm_list_1 (var));
return val;
}
#undef FUNC_NAME
SCM_DEFINE (scm_variable_set_x, "variable-set!", 2, 0, 0,
(SCM var, SCM val),
"Set the value of the variable @var{var} to @var{val}.\n"
"@var{var} must be a variable object, @var{val} can be any\n"
"value. Return an unspecified value.")
#define FUNC_NAME s_scm_variable_set_x
{
SCM_VALIDATE_VARIABLE (1, var);
SCM_VARIABLE_SET (var, val);
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
SCM_DEFINE (scm_variable_unset_x, "variable-unset!", 1, 0, 0,
(SCM var),
"Ensure that @var{var} is not bound to a value.\n"
"@var{var} must be a variable object.")
#define FUNC_NAME s_scm_variable_unset_x
{
SCM_VALIDATE_VARIABLE (1, var);
SCM_VARIABLE_SET (var, SCM_UNDEFINED);
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
SCM_DEFINE (scm_variable_bound_p, "variable-bound?", 1, 0, 0,
(SCM var),
"Return @code{#t} iff @var{var} is bound to a value.\n"
"Throws an error if @var{var} is not a variable object.")
#define FUNC_NAME s_scm_variable_bound_p
{
SCM_VALIDATE_VARIABLE (1, var);
return scm_from_bool (!scm_is_eq (SCM_VARIABLE_REF (var), SCM_UNDEFINED));
}
#undef FUNC_NAME
void
scm_init_variable ()
{
#include "libguile/variable.x"
}
/*
Local Variables:
c-file-style: "gnu"
End:
*/
|
