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d223c3fc | 1 | /* Copyright (C) 1995,1996,1997,1998,2000,2001, 2006, 2008, 2011 Free Software Foundation, Inc. |
0f2d19dd | 2 | * |
73be1d9e | 3 | * This library is free software; you can redistribute it and/or |
53befeb7 NJ |
4 | * modify it under the terms of the GNU Lesser General Public License |
5 | * as published by the Free Software Foundation; either version 3 of | |
6 | * the License, or (at your option) any later version. | |
0f2d19dd | 7 | * |
53befeb7 NJ |
8 | * This library is distributed in the hope that it will be useful, but |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
73be1d9e MV |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
11 | * Lesser General Public License for more details. | |
0f2d19dd | 12 | * |
73be1d9e MV |
13 | * You should have received a copy of the GNU Lesser General Public |
14 | * License along with this library; if not, write to the Free Software | |
53befeb7 NJ |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
16 | * 02110-1301 USA | |
73be1d9e | 17 | */ |
1bbd0b84 | 18 | |
1bbd0b84 | 19 | |
0f2d19dd | 20 | \f |
dbb605f5 LC |
21 | #ifdef HAVE_CONFIG_H |
22 | # include <config.h> | |
23 | #endif | |
0f2d19dd | 24 | |
a0599745 MD |
25 | #include "libguile/_scm.h" |
26 | #include "libguile/eq.h" | |
27 | #include "libguile/ports.h" | |
28 | #include "libguile/root.h" | |
29 | #include "libguile/smob.h" | |
86d31dfe | 30 | #include "libguile/deprecation.h" |
a0599745 MD |
31 | |
32 | #include "libguile/validate.h" | |
33 | #include "libguile/variable.h" | |
0f2d19dd | 34 | \f |
1cc91f1b | 35 | |
dbf5dfb3 MV |
36 | void |
37 | scm_i_variable_print (SCM exp, SCM port, scm_print_state *pstate) | |
0f2d19dd | 38 | { |
0607ebbf | 39 | scm_puts_unlocked ("#<variable ", port); |
0345e278 | 40 | scm_uintprint (SCM_UNPACK (exp), 16, port); |
0607ebbf | 41 | scm_puts_unlocked (" value: ", port); |
86d31dfe | 42 | scm_iprin1 (SCM_VARIABLE_REF (exp), port, pstate); |
0607ebbf | 43 | scm_putc_unlocked('>', port); |
0f2d19dd JB |
44 | } |
45 | ||
0f2d19dd JB |
46 | \f |
47 | ||
0f2d19dd | 48 | static SCM |
86d31dfe | 49 | make_variable (SCM init) |
0f2d19dd | 50 | { |
228a24ef | 51 | return scm_cell (scm_tc7_variable, SCM_UNPACK (init)); |
0f2d19dd JB |
52 | } |
53 | ||
86d31dfe MV |
54 | SCM_DEFINE (scm_make_variable, "make-variable", 1, 0, 0, |
55 | (SCM init), | |
9401323e | 56 | "Return a variable initialized to value @var{init}.") |
1bbd0b84 | 57 | #define FUNC_NAME s_scm_make_variable |
0f2d19dd | 58 | { |
86d31dfe | 59 | return make_variable (init); |
0f2d19dd | 60 | } |
1bbd0b84 | 61 | #undef FUNC_NAME |
0f2d19dd JB |
62 | |
63 | ||
86d31dfe MV |
64 | SCM_DEFINE (scm_make_undefined_variable, "make-undefined-variable", 0, 0, 0, |
65 | (), | |
9401323e | 66 | "Return a variable that is initially unbound.") |
1bbd0b84 | 67 | #define FUNC_NAME s_scm_make_undefined_variable |
0f2d19dd | 68 | { |
86d31dfe | 69 | return make_variable (SCM_UNDEFINED); |
0f2d19dd | 70 | } |
1bbd0b84 | 71 | #undef FUNC_NAME |
0f2d19dd JB |
72 | |
73 | ||
3b3b36dd | 74 | SCM_DEFINE (scm_variable_p, "variable?", 1, 0, 0, |
d727c64b | 75 | (SCM obj), |
03ba3d5b | 76 | "Return @code{#t} iff @var{obj} is a variable object, else\n" |
9401323e | 77 | "return @code{#f}.") |
1bbd0b84 | 78 | #define FUNC_NAME s_scm_variable_p |
0f2d19dd | 79 | { |
7888309b | 80 | return scm_from_bool (SCM_VARIABLEP (obj)); |
0f2d19dd | 81 | } |
1bbd0b84 | 82 | #undef FUNC_NAME |
0f2d19dd JB |
83 | |
84 | ||
3b3b36dd | 85 | SCM_DEFINE (scm_variable_ref, "variable-ref", 1, 0, 0, |
d727c64b | 86 | (SCM var), |
03ba3d5b MG |
87 | "Dereference @var{var} and return its value.\n" |
88 | "@var{var} must be a variable object; see @code{make-variable}\n" | |
89 | "and @code{make-undefined-variable}.") | |
1bbd0b84 | 90 | #define FUNC_NAME s_scm_variable_ref |
0f2d19dd | 91 | { |
86d31dfe | 92 | SCM val; |
4fd1f652 | 93 | SCM_VALIDATE_VARIABLE (1, var); |
86d31dfe | 94 | val = SCM_VARIABLE_REF (var); |
d223c3fc | 95 | if (scm_is_eq (val, SCM_UNDEFINED)) |
1afff620 | 96 | SCM_MISC_ERROR ("variable is unbound: ~S", scm_list_1 (var)); |
86d31dfe | 97 | return val; |
0f2d19dd | 98 | } |
1bbd0b84 | 99 | #undef FUNC_NAME |
0f2d19dd | 100 | |
3b3b36dd | 101 | SCM_DEFINE (scm_variable_set_x, "variable-set!", 2, 0, 0, |
d727c64b | 102 | (SCM var, SCM val), |
03ba3d5b MG |
103 | "Set the value of the variable @var{var} to @var{val}.\n" |
104 | "@var{var} must be a variable object, @var{val} can be any\n" | |
9401323e | 105 | "value. Return an unspecified value.") |
1bbd0b84 | 106 | #define FUNC_NAME s_scm_variable_set_x |
0f2d19dd | 107 | { |
22a52da1 | 108 | SCM_VALIDATE_VARIABLE (1, var); |
86d31dfe | 109 | SCM_VARIABLE_SET (var, val); |
0f2d19dd JB |
110 | return SCM_UNSPECIFIED; |
111 | } | |
1bbd0b84 | 112 | #undef FUNC_NAME |
0f2d19dd | 113 | |
a8aa4c0b BT |
114 | SCM_DEFINE (scm_variable_unset_x, "variable-unset!", 1, 0, 0, |
115 | (SCM var), | |
116 | "Ensure that @var{var} is not bound to a value.\n" | |
117 | "@var{var} must be a variable object.") | |
118 | #define FUNC_NAME s_scm_variable_unset_x | |
119 | { | |
120 | SCM_VALIDATE_VARIABLE (1, var); | |
121 | SCM_VARIABLE_SET (var, SCM_UNDEFINED); | |
122 | return SCM_UNSPECIFIED; | |
123 | } | |
124 | #undef FUNC_NAME | |
125 | ||
3b3b36dd | 126 | SCM_DEFINE (scm_variable_bound_p, "variable-bound?", 1, 0, 0, |
d727c64b | 127 | (SCM var), |
03ba3d5b | 128 | "Return @code{#t} iff @var{var} is bound to a value.\n" |
9401323e | 129 | "Throws an error if @var{var} is not a variable object.") |
1bbd0b84 | 130 | #define FUNC_NAME s_scm_variable_bound_p |
0f2d19dd | 131 | { |
22a52da1 | 132 | SCM_VALIDATE_VARIABLE (1, var); |
d223c3fc | 133 | return scm_from_bool (!scm_is_eq (SCM_VARIABLE_REF (var), SCM_UNDEFINED)); |
0f2d19dd | 134 | } |
1bbd0b84 | 135 | #undef FUNC_NAME |
0f2d19dd | 136 | |
1cc91f1b | 137 | |
0f2d19dd JB |
138 | void |
139 | scm_init_variable () | |
0f2d19dd | 140 | { |
a0599745 | 141 | #include "libguile/variable.x" |
0f2d19dd JB |
142 | } |
143 | ||
89e00824 ML |
144 | /* |
145 | Local Variables: | |
146 | c-file-style: "gnu" | |
147 | End: | |
148 | */ |