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82a48a57 | 1 | /* Copyright (C) 1999 Free Software Foundation, Inc. |
68a08303 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 | ||
68a08303 MD |
45 | \f |
46 | ||
a0599745 | 47 | #include "libguile/_scm.h" |
68a08303 | 48 | |
a0599745 MD |
49 | #include "libguile/eval.h" |
50 | #include "libguile/macros.h" | |
51 | #include "libguile/root.h" | |
68a08303 | 52 | |
a0599745 | 53 | #include "libguile/validate.h" |
68a08303 MD |
54 | #include "lang.h" |
55 | ||
56 | \f | |
57 | ||
58 | /* {Multi-language support} | |
59 | */ | |
60 | ||
61 | /* Representation of pairs: | |
62 | * | |
63 | * Since we're going to share data with Scheme, we use EOL instead of nil | |
64 | * in all data structures. | |
65 | */ | |
66 | ||
a1ec6916 | 67 | SCM_DEFINE (scm_nil_cons, "nil-cons", 2, 0, 0, |
1bbd0b84 GB |
68 | (SCM x, SCM y), |
69 | "") | |
70 | #define FUNC_NAME s_scm_nil_cons | |
68a08303 MD |
71 | { |
72 | register SCM z; | |
73 | SCM_NEWCELL (z); | |
74 | SCM_SETCAR (z, x); | |
75 | SCM_SETCDR (z, SCM_NIL2EOL (y, y)); | |
76 | return z; | |
77 | } | |
1bbd0b84 | 78 | #undef FUNC_NAME |
68a08303 MD |
79 | |
80 | ||
a1ec6916 | 81 | SCM_DEFINE (scm_nil_car, "nil-car", 1, 0, 0, |
1bbd0b84 | 82 | (SCM x), |
717050c8 | 83 | "") |
1bbd0b84 | 84 | #define FUNC_NAME s_scm_nil_car |
68a08303 MD |
85 | { |
86 | if (SCM_NILP (x)) | |
43a912cf | 87 | return scm_lisp_nil; |
3b3b36dd | 88 | SCM_VALIDATE_CONS (1,x); |
68a08303 MD |
89 | return SCM_CAR (x); |
90 | } | |
1bbd0b84 | 91 | #undef FUNC_NAME |
68a08303 | 92 | |
a1ec6916 | 93 | SCM_DEFINE (scm_nil_cdr, "nil-cdr", 1, 0, 0, |
1bbd0b84 | 94 | (SCM x), |
717050c8 | 95 | "") |
1bbd0b84 | 96 | #define FUNC_NAME s_scm_nil_cdr |
68a08303 MD |
97 | { |
98 | if (SCM_NILP (x)) | |
43a912cf | 99 | return scm_lisp_nil; |
3b3b36dd | 100 | SCM_VALIDATE_CONS (1,x); |
68a08303 MD |
101 | return SCM_EOL2NIL (SCM_CDR (x), x); |
102 | } | |
1bbd0b84 GB |
103 | #undef FUNC_NAME |
104 | ||
43a912cf | 105 | /* GJB:FIXME:: why does this return scm_lisp_nil instead of SCM_BOOL_F? |
1bbd0b84 | 106 | Could use SCM_BOOL, below, otherwise */ |
a1ec6916 | 107 | SCM_DEFINE (scm_null, "null", 1, 0, 0, |
1bbd0b84 | 108 | (SCM x), |
717050c8 | 109 | "") |
1bbd0b84 | 110 | #define FUNC_NAME s_scm_null |
68a08303 | 111 | { |
43a912cf | 112 | return (SCM_NILP (x) || SCM_NULLP (x) || SCM_FALSEP (x)) ? scm_lisp_t : scm_lisp_nil; |
68a08303 | 113 | } |
1bbd0b84 | 114 | #undef FUNC_NAME |
68a08303 MD |
115 | |
116 | SCM | |
117 | scm_m_while (SCM exp, SCM env) | |
118 | { | |
119 | register SCM x = exp = SCM_CDR (exp); | |
120 | SCM z = scm_eval_car (x, env); | |
121 | while (!SCM_NILP (z) && SCM_NFALSEP (z)) | |
122 | { | |
123 | while (SCM_NNULLP (x = SCM_CDR (x))) | |
124 | { | |
125 | if (SCM_NIMP (SCM_CAR (x))) | |
126 | (*scm_ceval_ptr) (SCM_CAR (x), env); | |
127 | } | |
128 | z = scm_eval_car (x = exp, env); | |
129 | } | |
43a912cf | 130 | return scm_lisp_nil; |
68a08303 MD |
131 | } |
132 | ||
43a912cf | 133 | /* GJB:FIXME:: why does this return scm_lisp_nil instead of SCM_BOOL_F? |
1bbd0b84 | 134 | Could use SCM_BOOL, below, otherwise */ |
c3ee7520 | 135 | SCM_DEFINE1 (scm_nil_eq, "nil-eq", scm_tc7_rpsubr, |
1bbd0b84 GB |
136 | (SCM x, SCM y), |
137 | "") | |
138 | #define FUNC_NAME s_scm_nil_eq | |
68a08303 | 139 | { |
54778cd3 | 140 | return ((SCM_EQ_P (x, y) |
68a08303 MD |
141 | || (SCM_NILP (x) && (SCM_NULLP (y) || SCM_FALSEP (y))) |
142 | || (SCM_NILP (y) && (SCM_NULLP (x) || SCM_FALSEP (x)))) | |
43a912cf MD |
143 | ? scm_lisp_t |
144 | : scm_lisp_nil); | |
68a08303 | 145 | } |
1bbd0b84 | 146 | #undef FUNC_NAME |
68a08303 MD |
147 | |
148 | \f | |
149 | ||
150 | void | |
151 | scm_init_lang () | |
152 | { | |
a0599745 | 153 | #include "libguile/lang.x" |
68a08303 MD |
154 | scm_make_synt ("nil-while", scm_makacro, scm_m_while); |
155 | } | |
89e00824 ML |
156 | |
157 | /* | |
158 | Local Variables: | |
159 | c-file-style: "gnu" | |
160 | End: | |
161 | */ |