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f2c9fcb0 | 1 | /* Copyright (C) 1999, 2000 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 | 41 | |
1bbd0b84 | 42 | |
68a08303 MD |
43 | \f |
44 | ||
a0599745 | 45 | #include "libguile/_scm.h" |
68a08303 | 46 | |
a0599745 MD |
47 | #include "libguile/eval.h" |
48 | #include "libguile/macros.h" | |
49 | #include "libguile/root.h" | |
68a08303 | 50 | |
a0599745 | 51 | #include "libguile/validate.h" |
0e850825 | 52 | #include "libguile/lang.h" |
68a08303 MD |
53 | |
54 | \f | |
55 | ||
56 | /* {Multi-language support} | |
57 | */ | |
58 | ||
59 | /* Representation of pairs: | |
60 | * | |
61 | * Since we're going to share data with Scheme, we use EOL instead of nil | |
62 | * in all data structures. | |
63 | */ | |
64 | ||
a1ec6916 | 65 | SCM_DEFINE (scm_nil_cons, "nil-cons", 2, 0, 0, |
1bbd0b84 | 66 | (SCM x, SCM y), |
950ba52d MG |
67 | "Create a new cons cell with @var{x} as the car and @var{y} as\n" |
68 | "the cdr, but convert @var{y} to Scheme's end-of-list if it is\n" | |
69 | "a LISP nil.") | |
1bbd0b84 | 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), |
950ba52d MG |
83 | "Return the car of @var{x}, but convert it to LISP nil if it\n" |
84 | "is Scheme's end-of-list.") | |
1bbd0b84 | 85 | #define FUNC_NAME s_scm_nil_car |
68a08303 MD |
86 | { |
87 | if (SCM_NILP (x)) | |
43a912cf | 88 | return scm_lisp_nil; |
3b3b36dd | 89 | SCM_VALIDATE_CONS (1,x); |
68a08303 MD |
90 | return SCM_CAR (x); |
91 | } | |
1bbd0b84 | 92 | #undef FUNC_NAME |
68a08303 | 93 | |
a1ec6916 | 94 | SCM_DEFINE (scm_nil_cdr, "nil-cdr", 1, 0, 0, |
1bbd0b84 | 95 | (SCM x), |
950ba52d MG |
96 | "Return the cdr of @var{x}, but convert it to LISP nil if it\n" |
97 | "is Scheme's end-of-list.") | |
1bbd0b84 | 98 | #define FUNC_NAME s_scm_nil_cdr |
68a08303 MD |
99 | { |
100 | if (SCM_NILP (x)) | |
43a912cf | 101 | return scm_lisp_nil; |
3b3b36dd | 102 | SCM_VALIDATE_CONS (1,x); |
68a08303 MD |
103 | return SCM_EOL2NIL (SCM_CDR (x), x); |
104 | } | |
1bbd0b84 GB |
105 | #undef FUNC_NAME |
106 | ||
43a912cf | 107 | /* GJB:FIXME:: why does this return scm_lisp_nil instead of SCM_BOOL_F? |
1bbd0b84 | 108 | Could use SCM_BOOL, below, otherwise */ |
a1ec6916 | 109 | SCM_DEFINE (scm_null, "null", 1, 0, 0, |
1bbd0b84 | 110 | (SCM x), |
950ba52d MG |
111 | "Return LISP's @code{t} if @var{x} is nil in the LISP sense,\n" |
112 | "return LISP's nil otherwise.") | |
1bbd0b84 | 113 | #define FUNC_NAME s_scm_null |
68a08303 | 114 | { |
1385d8ae | 115 | return (SCM_NILP (x) || SCM_NULLP (x) || SCM_FALSEP (x)) ? scm_lisp_t : scm_lisp_nil; |
68a08303 | 116 | } |
1bbd0b84 | 117 | #undef FUNC_NAME |
68a08303 MD |
118 | |
119 | SCM | |
120 | scm_m_while (SCM exp, SCM env) | |
121 | { | |
122 | register SCM x = exp = SCM_CDR (exp); | |
123 | SCM z = scm_eval_car (x, env); | |
124 | while (!SCM_NILP (z) && SCM_NFALSEP (z)) | |
125 | { | |
126 | while (SCM_NNULLP (x = SCM_CDR (x))) | |
127 | { | |
128 | if (SCM_NIMP (SCM_CAR (x))) | |
129 | (*scm_ceval_ptr) (SCM_CAR (x), env); | |
130 | } | |
131 | z = scm_eval_car (x = exp, env); | |
132 | } | |
43a912cf | 133 | return scm_lisp_nil; |
68a08303 MD |
134 | } |
135 | ||
43a912cf | 136 | /* GJB:FIXME:: why does this return scm_lisp_nil instead of SCM_BOOL_F? |
1bbd0b84 | 137 | Could use SCM_BOOL, below, otherwise */ |
c3ee7520 | 138 | SCM_DEFINE1 (scm_nil_eq, "nil-eq", scm_tc7_rpsubr, |
1bbd0b84 | 139 | (SCM x, SCM y), |
950ba52d MG |
140 | "Compare @var{x} and @var{y} and return LISP's t if they are\n" |
141 | "@code{eq?}, return LISP's nil otherwise.") | |
1bbd0b84 | 142 | #define FUNC_NAME s_scm_nil_eq |
68a08303 | 143 | { |
54778cd3 | 144 | return ((SCM_EQ_P (x, y) |
68a08303 MD |
145 | || (SCM_NILP (x) && (SCM_NULLP (y) || SCM_FALSEP (y))) |
146 | || (SCM_NILP (y) && (SCM_NULLP (x) || SCM_FALSEP (x)))) | |
1385d8ae | 147 | ? scm_lisp_t |
43a912cf | 148 | : scm_lisp_nil); |
68a08303 | 149 | } |
1bbd0b84 | 150 | #undef FUNC_NAME |
68a08303 MD |
151 | |
152 | \f | |
153 | ||
154 | void | |
155 | scm_init_lang () | |
156 | { | |
8dc9439f | 157 | #ifndef SCM_MAGIC_SNARFER |
a0599745 | 158 | #include "libguile/lang.x" |
8dc9439f | 159 | #endif |
68a08303 MD |
160 | scm_make_synt ("nil-while", scm_makacro, scm_m_while); |
161 | } | |
89e00824 ML |
162 | |
163 | /* | |
164 | Local Variables: | |
165 | c-file-style: "gnu" | |
166 | End: | |
167 | */ |