Commit | Line | Data |
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9d5dc023 | 1 | /* Copyright (C) 1995,1996,2000,2001, 2004, 2005 Free Software Foundation, Inc. |
0f2d19dd | 2 | * |
73be1d9e MV |
3 | * This library is free software; you can redistribute it and/or |
4 | * modify it under the terms of the GNU Lesser General Public | |
5 | * License as published by the Free Software Foundation; either | |
6 | * version 2.1 of the License, or (at your option) any later version. | |
0f2d19dd | 7 | * |
73be1d9e MV |
8 | * This library 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 GNU | |
11 | * Lesser General Public License for more details. | |
0f2d19dd | 12 | * |
73be1d9e MV |
13 | * You should have received a copy of the GNU Lesser General Public |
14 | * License along with this library; if not, write to the Free Software | |
92205699 | 15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
73be1d9e | 16 | */ |
1bbd0b84 | 17 | |
1bbd0b84 | 18 | |
0f2d19dd | 19 | \f |
4983cbe4 | 20 | |
a0599745 | 21 | #include "libguile/_scm.h" |
a0599745 | 22 | #include "libguile/validate.h" |
1bbd0b84 | 23 | |
4983cbe4 DH |
24 | #include "libguile/pairs.h" |
25 | ||
0f2d19dd JB |
26 | \f |
27 | ||
0f2d19dd JB |
28 | /* {Pairs} |
29 | */ | |
30 | ||
e81d98ec DH |
31 | #if (SCM_DEBUG_PAIR_ACCESSES == 1) |
32 | ||
ba1b2226 | 33 | #include "libguile/ports.h" |
e81d98ec DH |
34 | #include "libguile/strings.h" |
35 | ||
36 | void scm_error_pair_access (SCM non_pair) | |
37 | { | |
bab246f3 | 38 | static unsigned int running = 0; |
f32632e6 | 39 | SCM message = scm_from_locale_string ("Non-pair accessed with SCM_C[AD]R: `~S'\n"); |
bab246f3 DH |
40 | |
41 | if (!running) | |
42 | { | |
43 | running = 1; | |
44 | scm_simple_format (scm_current_error_port (), | |
1afff620 | 45 | message, scm_list_1 (non_pair)); |
bab246f3 DH |
46 | abort (); |
47 | } | |
e81d98ec DH |
48 | } |
49 | ||
50 | #endif | |
51 | ||
3b3b36dd | 52 | SCM_DEFINE (scm_cons, "cons", 2, 0, 0, |
4983cbe4 | 53 | (SCM x, SCM y), |
1e6808ea MG |
54 | "Return a newly allocated pair whose car is @var{x} and whose\n" |
55 | "cdr is @var{y}. The pair is guaranteed to be different (in the\n" | |
56 | "sense of @code{eq?}) from every previously existing object.") | |
1bbd0b84 | 57 | #define FUNC_NAME s_scm_cons |
0f2d19dd | 58 | { |
228a24ef | 59 | return scm_cell (SCM_UNPACK (x), SCM_UNPACK (y)); |
0f2d19dd | 60 | } |
1bbd0b84 | 61 | #undef FUNC_NAME |
0f2d19dd | 62 | |
1cc91f1b | 63 | |
0f2d19dd | 64 | SCM |
1bbd0b84 | 65 | scm_cons2 (SCM w, SCM x, SCM y) |
0f2d19dd | 66 | { |
16d4699b | 67 | return scm_cons (w, scm_cons (x, y)); |
0f2d19dd JB |
68 | } |
69 | ||
70 | ||
a1ec6916 | 71 | SCM_DEFINE (scm_pair_p, "pair?", 1, 0, 0, |
1bbd0b84 | 72 | (SCM x), |
1e6808ea MG |
73 | "Return @code{#t} if @var{x} is a pair; otherwise return\n" |
74 | "@code{#f}.") | |
1bbd0b84 | 75 | #define FUNC_NAME s_scm_pair_p |
0f2d19dd | 76 | { |
6fcc7d48 | 77 | return scm_from_bool (scm_is_pair (x)); |
0f2d19dd | 78 | } |
1bbd0b84 | 79 | #undef FUNC_NAME |
0f2d19dd | 80 | |
6fcc7d48 MV |
81 | int |
82 | scm_is_pair (SCM x) | |
83 | { | |
84 | return SCM_I_CONSP (x); | |
85 | } | |
86 | ||
87 | SCM | |
88 | scm_car (SCM pair) | |
89 | { | |
90 | if (!scm_is_pair (pair)) | |
91 | scm_wrong_type_arg_msg (NULL, 0, pair, "pair"); | |
92 | return SCM_CAR (pair); | |
93 | } | |
94 | ||
95 | SCM | |
96 | scm_cdr (SCM pair) | |
97 | { | |
98 | if (!scm_is_pair (pair)) | |
99 | scm_wrong_type_arg_msg (NULL, 0, pair, "pair"); | |
100 | return SCM_CDR (pair); | |
101 | } | |
102 | ||
103 | SCM | |
7dab4b37 | 104 | scm_i_chase_pairs (SCM tree, scm_t_uint32 pattern) |
6fcc7d48 MV |
105 | { |
106 | do | |
107 | { | |
108 | if (!scm_is_pair (tree)) | |
109 | scm_wrong_type_arg_msg (NULL, 0, tree, "pair"); | |
110 | tree = (pattern & 1) ? SCM_CAR (tree) : SCM_CDR (tree); | |
111 | pattern >>= 2; | |
112 | } | |
113 | while (pattern); | |
114 | return tree; | |
115 | } | |
4983cbe4 | 116 | |
a1ec6916 | 117 | SCM_DEFINE (scm_set_car_x, "set-car!", 2, 0, 0, |
1bbd0b84 | 118 | (SCM pair, SCM value), |
d7588e54 GB |
119 | "Stores @var{value} in the car field of @var{pair}. The value returned\n" |
120 | "by @code{set-car!} is unspecified.") | |
1bbd0b84 | 121 | #define FUNC_NAME s_scm_set_car_x |
0f2d19dd | 122 | { |
4983cbe4 | 123 | SCM_VALIDATE_CONS (1, pair); |
d65010b8 | 124 | SCM_SETCAR (pair, value); |
9b8721aa | 125 | return SCM_UNSPECIFIED; |
0f2d19dd | 126 | } |
1bbd0b84 | 127 | #undef FUNC_NAME |
0f2d19dd | 128 | |
4983cbe4 | 129 | |
a1ec6916 | 130 | SCM_DEFINE (scm_set_cdr_x, "set-cdr!", 2, 0, 0, |
1bbd0b84 | 131 | (SCM pair, SCM value), |
d7588e54 GB |
132 | "Stores @var{value} in the cdr field of @var{pair}. The value returned\n" |
133 | "by @code{set-cdr!} is unspecified.") | |
1bbd0b84 | 134 | #define FUNC_NAME s_scm_set_cdr_x |
0f2d19dd | 135 | { |
4983cbe4 | 136 | SCM_VALIDATE_CONS (1, pair); |
d65010b8 | 137 | SCM_SETCDR (pair, value); |
9b8721aa | 138 | return SCM_UNSPECIFIED; |
0f2d19dd | 139 | } |
1bbd0b84 | 140 | #undef FUNC_NAME |
0f2d19dd | 141 | |
0f2d19dd JB |
142 | \f |
143 | ||
14b18ed6 DH |
144 | /* Every cxr-pattern is made up of pairs of bits, starting with the two least |
145 | * significant bits. If in a pair of bits the least significant of the two | |
146 | * bits is 0, this means CDR, otherwise CAR. The most significant bits of the | |
147 | * two bits is only needed to indicate when cxr-ing is ready. This is the | |
148 | * case, when all remaining pairs of bits equal 00. */ | |
149 | ||
150 | typedef struct { | |
151 | const char *name; | |
152 | unsigned char pattern; | |
153 | } t_cxr; | |
154 | ||
155 | static const t_cxr cxrs[] = | |
0f2d19dd | 156 | { |
14b18ed6 DH |
157 | {"cdr", 0x02}, /* 00000010 */ |
158 | {"car", 0x03}, /* 00000011 */ | |
159 | {"cddr", 0x0a}, /* 00001010 */ | |
160 | {"cdar", 0x0b}, /* 00001011 */ | |
161 | {"cadr", 0x0e}, /* 00001110 */ | |
162 | {"caar", 0x0f}, /* 00001111 */ | |
163 | {"cdddr", 0x2a}, /* 00101010 */ | |
164 | {"cddar", 0x2b}, /* 00101011 */ | |
165 | {"cdadr", 0x2e}, /* 00101110 */ | |
166 | {"cdaar", 0x2f}, /* 00101111 */ | |
167 | {"caddr", 0x3a}, /* 00111010 */ | |
168 | {"cadar", 0x3b}, /* 00111011 */ | |
169 | {"caadr", 0x3e}, /* 00111110 */ | |
170 | {"caaar", 0x3f}, /* 00111111 */ | |
171 | {"cddddr", 0xaa}, /* 10101010 */ | |
172 | {"cdddar", 0xab}, /* 10101011 */ | |
173 | {"cddadr", 0xae}, /* 10101110 */ | |
174 | {"cddaar", 0xaf}, /* 10101111 */ | |
175 | {"cdaddr", 0xba}, /* 10111010 */ | |
176 | {"cdadar", 0xbb}, /* 10111011 */ | |
177 | {"cdaadr", 0xbe}, /* 10111110 */ | |
178 | {"cdaaar", 0xbf}, /* 10111111 */ | |
179 | {"cadddr", 0xea}, /* 11101010 */ | |
180 | {"caddar", 0xeb}, /* 11101011 */ | |
181 | {"cadadr", 0xee}, /* 11101110 */ | |
182 | {"cadaar", 0xef}, /* 11101111 */ | |
183 | {"caaddr", 0xfa}, /* 11111010 */ | |
184 | {"caadar", 0xfb}, /* 11111011 */ | |
185 | {"caaadr", 0xfe}, /* 11111110 */ | |
186 | {"caaaar", 0xff}, /* 11111111 */ | |
187 | {0, 0} | |
0f2d19dd JB |
188 | }; |
189 | ||
190 | \f | |
1cc91f1b | 191 | |
0f2d19dd JB |
192 | void |
193 | scm_init_pairs () | |
0f2d19dd | 194 | { |
e59bb516 DH |
195 | unsigned int subnr = 0; |
196 | ||
14b18ed6 DH |
197 | for (subnr = 0; cxrs[subnr].name; subnr++) |
198 | { | |
199 | SCM (*pattern) () = (SCM (*) ()) (scm_t_bits) cxrs[subnr].pattern; | |
200 | scm_c_define_subr (cxrs[subnr].name, scm_tc7_cxr, pattern); | |
201 | } | |
e59bb516 | 202 | |
a0599745 | 203 | #include "libguile/pairs.x" |
0f2d19dd JB |
204 | } |
205 | ||
89e00824 ML |
206 | |
207 | /* | |
208 | Local Variables: | |
209 | c-file-style: "gnu" | |
210 | End: | |
211 | */ |