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78a0461a | 1 | /* Copyright (C) 1998, 1999 Free Software Foundation, Inc. |
40cf7e92 MD |
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 | |
15 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, | |
16 | * Boston, MA 02111-1307 USA | |
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. | |
40 | * If you do not wish that, delete this exception notice. */ | |
1bbd0b84 GB |
41 | |
42 | /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999, | |
43 | gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */ | |
44 | ||
40cf7e92 MD |
45 | \f |
46 | ||
47 | #include "_scm.h" | |
48 | #include "eval.h" | |
49 | #include "macros.h" | |
650de6d7 | 50 | #include "modules.h" |
ba11fd4c | 51 | #include "root.h" |
40cf7e92 | 52 | |
b6791b2e | 53 | #include "validate.h" |
40cf7e92 MD |
54 | #include "evalext.h" |
55 | ||
a70fb265 MD |
56 | SCM_SYMBOL (scm_sym_setter, "setter"); |
57 | ||
58 | SCM | |
59 | scm_m_generalized_set_x (SCM xorig, SCM env) | |
60 | { | |
61 | SCM x = SCM_CDR (xorig); | |
62 | SCM_ASSYNT (2 == scm_ilength (x), xorig, scm_s_expression, scm_s_set_x); | |
0c95b57d | 63 | if (SCM_SYMBOLP (SCM_CAR (x))) |
a70fb265 | 64 | return scm_cons (SCM_IM_SET_X, x); |
0c95b57d | 65 | else if (SCM_CONSP (SCM_CAR (x))) |
a70fb265 MD |
66 | return scm_cons (SCM_LIST2 (scm_sym_setter, SCM_CAAR (x)), |
67 | scm_append (SCM_LIST2 (SCM_CDAR (x), SCM_CDR (x)))); | |
68 | return scm_wta (xorig, scm_s_variable, scm_s_set_x); | |
69 | } | |
70 | ||
a1ec6916 | 71 | SCM_DEFINE (scm_definedp, "defined?", 1, 1, 0, |
1bbd0b84 | 72 | (SCM sym, SCM env), |
b380b885 | 73 | "Return @code{#t} if @var{sym} is defined in the top-level environment.") |
1bbd0b84 | 74 | #define FUNC_NAME s_scm_definedp |
40cf7e92 MD |
75 | { |
76 | SCM vcell; | |
77 | ||
3b3b36dd | 78 | SCM_VALIDATE_SYMBOL (1,sym); |
40cf7e92 | 79 | |
b325a6c8 MD |
80 | if (SCM_UNBNDP (env)) |
81 | vcell = scm_sym2vcell(sym, | |
82 | SCM_CDR (scm_top_level_lookup_closure_var), | |
83 | SCM_BOOL_F); | |
84 | else | |
85 | { | |
86 | SCM frames = env; | |
87 | register SCM b; | |
88 | for (; SCM_NIMP (frames); frames = SCM_CDR (frames)) | |
89 | { | |
1bbd0b84 | 90 | SCM_ASSERT (SCM_CONSP (frames), env, SCM_ARG2, FUNC_NAME); |
b325a6c8 MD |
91 | b = SCM_CAR (frames); |
92 | if (SCM_NFALSEP (scm_procedure_p (b))) | |
93 | break; | |
c1bfcf60 | 94 | SCM_ASSERT (SCM_CONSP (b), env, SCM_ARG2, FUNC_NAME); |
b325a6c8 MD |
95 | for (b = SCM_CAR (b); SCM_NIMP (b); b = SCM_CDR (b)) |
96 | { | |
97 | if (SCM_NCONSP (b)) | |
98 | { | |
99 | if (b == sym) | |
100 | return SCM_BOOL_T; | |
101 | else | |
102 | break; | |
103 | } | |
104 | if (SCM_CAR (b) == sym) | |
105 | return SCM_BOOL_T; | |
106 | } | |
107 | } | |
108 | vcell = scm_sym2vcell (sym, | |
109 | SCM_NIMP (frames) ? SCM_CAR (frames) : SCM_BOOL_F, | |
110 | SCM_BOOL_F); | |
111 | } | |
112 | ||
113 | return (vcell == SCM_BOOL_F || SCM_UNBNDP (SCM_CDR (vcell)) | |
114 | ? SCM_BOOL_F | |
115 | : SCM_BOOL_T); | |
40cf7e92 | 116 | } |
1bbd0b84 | 117 | #undef FUNC_NAME |
40cf7e92 | 118 | |
b8229a3b MS |
119 | |
120 | SCM_SYNTAX (s_undefine, "undefine", scm_makacro, scm_m_undefine); | |
40cf7e92 MD |
121 | |
122 | SCM | |
6e8d25a6 | 123 | scm_m_undefine (SCM x, SCM env) |
40cf7e92 MD |
124 | { |
125 | SCM arg1 = x; | |
126 | x = SCM_CDR (x); | |
127 | SCM_ASSYNT (SCM_TOP_LEVEL (env), arg1, "bad placement ", s_undefine); | |
0c95b57d | 128 | SCM_ASSYNT (SCM_CONSP (x) && SCM_CDR (x) == SCM_EOL, |
40cf7e92 MD |
129 | arg1, scm_s_expression, s_undefine); |
130 | x = SCM_CAR (x); | |
0c95b57d | 131 | SCM_ASSYNT (SCM_SYMBOLP (x), arg1, scm_s_variable, s_undefine); |
40cf7e92 MD |
132 | arg1 = scm_sym2vcell (x, scm_env_top_level (env), SCM_BOOL_F); |
133 | SCM_ASSYNT (SCM_NFALSEP (arg1) && !SCM_UNBNDP (SCM_CDR (arg1)), | |
134 | x, "variable already unbound ", s_undefine); | |
135 | #if 0 | |
136 | #ifndef SCM_RECKLESS | |
137 | if (SCM_NIMP (SCM_CDR (arg1)) && ((SCM) SCM_SNAME (SCM_CDR (arg1)) == x)) | |
138 | scm_warn ("undefining built-in ", SCM_CHARS (x)); | |
139 | else | |
140 | #endif | |
141 | if (5 <= scm_verbose && SCM_UNDEFINED != SCM_CDR (arg1)) | |
142 | scm_warn ("redefining ", SCM_CHARS (x)); | |
143 | #endif | |
144 | SCM_SETCDR (arg1, SCM_UNDEFINED); | |
145 | #ifdef SICP | |
146 | return SCM_CAR (arg1); | |
147 | #else | |
148 | return SCM_UNSPECIFIED; | |
149 | #endif | |
150 | } | |
151 | ||
285302e1 | 152 | /* This name is obsolete. Will be removed in 1.5. */ |
1bbd0b84 | 153 | SCM_REGISTER_PROC (s_serial_map, "serial-map", 2, 0, 1, scm_map); |
40cf7e92 | 154 | |
1bbd0b84 | 155 | SCM_REGISTER_PROC (s_map_in_order, "map-in-order", 2, 0, 1, scm_map); |
285302e1 | 156 | |
40cf7e92 MD |
157 | void |
158 | scm_init_evalext () | |
159 | { | |
a70fb265 | 160 | scm_make_synt (scm_s_set_x, scm_makmmacro, scm_m_generalized_set_x); |
40cf7e92 MD |
161 | #include "evalext.x" |
162 | } | |
89e00824 ML |
163 | |
164 | /* | |
165 | Local Variables: | |
166 | c-file-style: "gnu" | |
167 | End: | |
168 | */ |