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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. */ | |
41 | \f | |
42 | ||
43 | #include "_scm.h" | |
44 | ||
45 | #include "eval.h" | |
46 | #include "macros.h" | |
47 | ||
48 | #include "lang.h" | |
49 | ||
50 | \f | |
51 | ||
52 | /* {Multi-language support} | |
53 | */ | |
54 | ||
55 | /* Representation of pairs: | |
56 | * | |
57 | * Since we're going to share data with Scheme, we use EOL instead of nil | |
58 | * in all data structures. | |
59 | */ | |
60 | ||
61 | SCM_PROC (s_nil_cons, "nil-cons", 2, 0, 0, scm_nil_cons); | |
62 | ||
63 | SCM | |
64 | scm_nil_cons (SCM x, SCM y) | |
65 | { | |
66 | register SCM z; | |
67 | SCM_NEWCELL (z); | |
68 | SCM_SETCAR (z, x); | |
69 | SCM_SETCDR (z, SCM_NIL2EOL (y, y)); | |
70 | return z; | |
71 | } | |
72 | ||
73 | ||
74 | SCM_PROC (s_nil_car, "nil-car", 1, 0, 0, scm_nil_car); | |
75 | ||
76 | SCM | |
77 | scm_nil_car (SCM x) | |
78 | { | |
79 | if (SCM_NILP (x)) | |
80 | return scm_nil; | |
81 | SCM_ASSERT (SCM_NIMP (x) && SCM_CONSP (x), x, SCM_ARG1, s_nil_car); | |
82 | return SCM_CAR (x); | |
83 | } | |
84 | ||
85 | SCM_PROC (s_nil_cdr, "nil-cdr", 1, 0, 0, scm_nil_cdr); | |
86 | ||
87 | SCM | |
88 | scm_nil_cdr (SCM x) | |
89 | { | |
90 | if (SCM_NILP (x)) | |
91 | return scm_nil; | |
92 | SCM_ASSERT (SCM_NIMP (x) && SCM_CONSP (x), x, SCM_ARG1, s_nil_cdr); | |
93 | return SCM_EOL2NIL (SCM_CDR (x), x); | |
94 | } | |
95 | ||
96 | SCM_PROC (s_null, "null", 1, 0, 0, scm_null); | |
97 | ||
98 | SCM | |
99 | scm_null (SCM x) | |
100 | { | |
101 | return (SCM_NILP (x) || SCM_NULLP (x) || SCM_FALSEP (x)) ? scm_t : scm_nil; | |
102 | } | |
103 | ||
104 | SCM | |
105 | scm_m_while (SCM exp, SCM env) | |
106 | { | |
107 | register SCM x = exp = SCM_CDR (exp); | |
108 | SCM z = scm_eval_car (x, env); | |
109 | while (!SCM_NILP (z) && SCM_NFALSEP (z)) | |
110 | { | |
111 | while (SCM_NNULLP (x = SCM_CDR (x))) | |
112 | { | |
113 | if (SCM_NIMP (SCM_CAR (x))) | |
114 | (*scm_ceval_ptr) (SCM_CAR (x), env); | |
115 | } | |
116 | z = scm_eval_car (x = exp, env); | |
117 | } | |
118 | return scm_nil; | |
119 | } | |
120 | ||
121 | SCM_PROC1 (s_nil_eq, "nil-eq", scm_tc7_rpsubr, scm_nil_eq); | |
122 | ||
123 | SCM | |
124 | scm_nil_eq (SCM x, SCM y) | |
125 | { | |
126 | return (((x==y) | |
127 | || (SCM_NILP (x) && (SCM_NULLP (y) || SCM_FALSEP (y))) | |
128 | || (SCM_NILP (y) && (SCM_NULLP (x) || SCM_FALSEP (x)))) | |
129 | ? scm_t | |
130 | : scm_nil); | |
131 | } | |
132 | ||
133 | \f | |
134 | ||
135 | void | |
136 | scm_init_lang () | |
137 | { | |
138 | #include "lang.x" | |
139 | scm_make_synt ("nil-while", scm_makacro, scm_m_while); | |
140 | } |