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22a52da1 | 1 | /* Copyright (C) 1995,1996,1997,1998,2000,2001 Free Software Foundation, Inc. |
0f2d19dd JB |
2 | * |
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) | |
6 | * any later version. | |
7 | * | |
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. | |
12 | * | |
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 | |
82892bed JB |
15 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
16 | * Boston, MA 02111-1307 USA | |
0f2d19dd JB |
17 | * |
18 | * As a special exception, the Free Software Foundation gives permission | |
19 | * for additional uses of the text contained in its release of GUILE. | |
20 | * | |
21 | * The exception is that, if you link the GUILE library with other files | |
22 | * to produce an executable, this does not by itself cause the | |
23 | * resulting executable to be covered by the GNU General Public License. | |
24 | * Your use of that executable is in no way restricted on account of | |
25 | * linking the GUILE library code into it. | |
26 | * | |
27 | * This exception does not however invalidate any other reasons why | |
28 | * the executable file might be covered by the GNU General Public License. | |
29 | * | |
30 | * This exception applies only to the code released by the | |
31 | * Free Software Foundation under the name GUILE. If you copy | |
32 | * code from other Free Software Foundation releases into a copy of | |
33 | * GUILE, as the General Public License permits, the exception does | |
34 | * not apply to the code that you add in this way. To avoid misleading | |
35 | * anyone as to the status of such modified files, you must delete | |
36 | * this exception notice from them. | |
37 | * | |
38 | * If you write modifications of your own for GUILE, it is your choice | |
39 | * whether to permit this exception to apply to your modifications. | |
82892bed | 40 | * If you do not wish that, delete this exception notice. */ |
1bbd0b84 | 41 | |
1bbd0b84 | 42 | |
0f2d19dd JB |
43 | \f |
44 | ||
a0599745 MD |
45 | #include "libguile/_scm.h" |
46 | #include "libguile/eq.h" | |
47 | #include "libguile/ports.h" | |
48 | #include "libguile/root.h" | |
49 | #include "libguile/smob.h" | |
86d31dfe | 50 | #include "libguile/deprecation.h" |
a0599745 MD |
51 | |
52 | #include "libguile/validate.h" | |
53 | #include "libguile/variable.h" | |
0f2d19dd | 54 | \f |
1cc91f1b | 55 | |
dbf5dfb3 MV |
56 | void |
57 | scm_i_variable_print (SCM exp, SCM port, scm_print_state *pstate) | |
0f2d19dd | 58 | { |
b7f3516f | 59 | scm_puts ("#<variable ", port); |
22a52da1 | 60 | scm_intprint (SCM_UNPACK (exp), 16, port); |
2b1d120c | 61 | scm_puts (" value: ", port); |
86d31dfe | 62 | scm_iprin1 (SCM_VARIABLE_REF (exp), port, pstate); |
b7f3516f | 63 | scm_putc('>', port); |
0f2d19dd JB |
64 | } |
65 | ||
0f2d19dd JB |
66 | \f |
67 | ||
0f2d19dd | 68 | static SCM |
86d31dfe | 69 | make_variable (SCM init) |
0f2d19dd | 70 | { |
8c494e99 DH |
71 | SCM z; |
72 | SCM_NEWCELL (z); | |
73 | SCM_SET_CELL_WORD_1 (z, SCM_UNPACK (init)); | |
74 | SCM_SET_CELL_TYPE (z, scm_tc7_variable); | |
75 | scm_remember_upto_here_1 (init); | |
76 | return z; | |
0f2d19dd JB |
77 | } |
78 | ||
86d31dfe MV |
79 | SCM_DEFINE (scm_make_variable, "make-variable", 1, 0, 0, |
80 | (SCM init), | |
81 | "Return a variable initialized to value @var{init}.\n") | |
1bbd0b84 | 82 | #define FUNC_NAME s_scm_make_variable |
0f2d19dd | 83 | { |
86d31dfe | 84 | return make_variable (init); |
0f2d19dd | 85 | } |
1bbd0b84 | 86 | #undef FUNC_NAME |
0f2d19dd JB |
87 | |
88 | ||
86d31dfe MV |
89 | SCM_DEFINE (scm_make_undefined_variable, "make-undefined-variable", 0, 0, 0, |
90 | (), | |
91 | "Return a variable that is initially unbound.\n") | |
1bbd0b84 | 92 | #define FUNC_NAME s_scm_make_undefined_variable |
0f2d19dd | 93 | { |
86d31dfe | 94 | return make_variable (SCM_UNDEFINED); |
0f2d19dd | 95 | } |
1bbd0b84 | 96 | #undef FUNC_NAME |
0f2d19dd JB |
97 | |
98 | ||
3b3b36dd | 99 | SCM_DEFINE (scm_variable_p, "variable?", 1, 0, 0, |
d727c64b | 100 | (SCM obj), |
03ba3d5b MG |
101 | "Return @code{#t} iff @var{obj} is a variable object, else\n" |
102 | "return @code{#f}\n") | |
1bbd0b84 | 103 | #define FUNC_NAME s_scm_variable_p |
0f2d19dd | 104 | { |
4fd1f652 | 105 | return SCM_BOOL (SCM_VARIABLEP (obj)); |
0f2d19dd | 106 | } |
1bbd0b84 | 107 | #undef FUNC_NAME |
0f2d19dd JB |
108 | |
109 | ||
3b3b36dd | 110 | SCM_DEFINE (scm_variable_ref, "variable-ref", 1, 0, 0, |
d727c64b | 111 | (SCM var), |
03ba3d5b MG |
112 | "Dereference @var{var} and return its value.\n" |
113 | "@var{var} must be a variable object; see @code{make-variable}\n" | |
114 | "and @code{make-undefined-variable}.") | |
1bbd0b84 | 115 | #define FUNC_NAME s_scm_variable_ref |
0f2d19dd | 116 | { |
86d31dfe | 117 | SCM val; |
4fd1f652 | 118 | SCM_VALIDATE_VARIABLE (1, var); |
86d31dfe MV |
119 | val = SCM_VARIABLE_REF (var); |
120 | if (val == SCM_UNDEFINED) | |
1afff620 | 121 | SCM_MISC_ERROR ("variable is unbound: ~S", scm_list_1 (var)); |
86d31dfe | 122 | return val; |
0f2d19dd | 123 | } |
1bbd0b84 | 124 | #undef FUNC_NAME |
0f2d19dd | 125 | |
3b3b36dd | 126 | SCM_DEFINE (scm_variable_set_x, "variable-set!", 2, 0, 0, |
d727c64b | 127 | (SCM var, SCM val), |
03ba3d5b MG |
128 | "Set the value of the variable @var{var} to @var{val}.\n" |
129 | "@var{var} must be a variable object, @var{val} can be any\n" | |
130 | "value. Return an unspecified value.\n") | |
1bbd0b84 | 131 | #define FUNC_NAME s_scm_variable_set_x |
0f2d19dd | 132 | { |
22a52da1 | 133 | SCM_VALIDATE_VARIABLE (1, var); |
86d31dfe | 134 | SCM_VARIABLE_SET (var, val); |
0f2d19dd JB |
135 | return SCM_UNSPECIFIED; |
136 | } | |
1bbd0b84 | 137 | #undef FUNC_NAME |
0f2d19dd | 138 | |
3b3b36dd | 139 | SCM_DEFINE (scm_variable_bound_p, "variable-bound?", 1, 0, 0, |
d727c64b | 140 | (SCM var), |
03ba3d5b MG |
141 | "Return @code{#t} iff @var{var} is bound to a value.\n" |
142 | "Throws an error if @var{var} is not a variable object.\n") | |
1bbd0b84 | 143 | #define FUNC_NAME s_scm_variable_bound_p |
0f2d19dd | 144 | { |
22a52da1 | 145 | SCM_VALIDATE_VARIABLE (1, var); |
86d31dfe | 146 | return SCM_BOOL (SCM_VARIABLE_REF (var) != SCM_UNDEFINED); |
0f2d19dd | 147 | } |
1bbd0b84 | 148 | #undef FUNC_NAME |
0f2d19dd | 149 | |
1cc91f1b | 150 | |
0f2d19dd JB |
151 | void |
152 | scm_init_variable () | |
0f2d19dd | 153 | { |
8dc9439f | 154 | #ifndef SCM_MAGIC_SNARFER |
a0599745 | 155 | #include "libguile/variable.x" |
8dc9439f | 156 | #endif |
0f2d19dd JB |
157 | } |
158 | ||
89e00824 ML |
159 | /* |
160 | Local Variables: | |
161 | c-file-style: "gnu" | |
162 | End: | |
163 | */ |