[270] | 1 | /*
|
---|
| 2 | ** random.c - Random module
|
---|
| 3 | **
|
---|
| 4 | ** See Copyright Notice in mruby.h
|
---|
| 5 | */
|
---|
| 6 |
|
---|
[331] | 7 | #include <mruby.h>
|
---|
| 8 | #include <mruby/variable.h>
|
---|
| 9 | #include <mruby/class.h>
|
---|
| 10 | #include <mruby/data.h>
|
---|
| 11 | #include <mruby/array.h>
|
---|
[270] | 12 | #include "mt19937ar.h"
|
---|
| 13 |
|
---|
| 14 | #include <time.h>
|
---|
| 15 |
|
---|
| 16 | static char const MT_STATE_KEY[] = "$mrb_i_mt_state";
|
---|
| 17 |
|
---|
| 18 | static const struct mrb_data_type mt_state_type = {
|
---|
| 19 | MT_STATE_KEY, mrb_free,
|
---|
| 20 | };
|
---|
| 21 |
|
---|
| 22 | static mrb_value mrb_random_rand(mrb_state *mrb, mrb_value self);
|
---|
| 23 | static mrb_value mrb_random_srand(mrb_state *mrb, mrb_value self);
|
---|
| 24 |
|
---|
| 25 | static void
|
---|
| 26 | mt_srand(mt_state *t, unsigned long seed)
|
---|
| 27 | {
|
---|
| 28 | mrb_random_init_genrand(t, seed);
|
---|
| 29 | }
|
---|
| 30 |
|
---|
| 31 | static unsigned long
|
---|
| 32 | mt_rand(mt_state *t)
|
---|
| 33 | {
|
---|
| 34 | return mrb_random_genrand_int32(t);
|
---|
| 35 | }
|
---|
| 36 |
|
---|
| 37 | static double
|
---|
| 38 | mt_rand_real(mt_state *t)
|
---|
| 39 | {
|
---|
| 40 | return mrb_random_genrand_real1(t);
|
---|
| 41 | }
|
---|
| 42 |
|
---|
| 43 | static mrb_value
|
---|
| 44 | mrb_random_mt_srand(mrb_state *mrb, mt_state *t, mrb_value seed)
|
---|
| 45 | {
|
---|
| 46 | if (mrb_nil_p(seed)) {
|
---|
| 47 | seed = mrb_fixnum_value((mrb_int)(time(NULL) + mt_rand(t)));
|
---|
| 48 | if (mrb_fixnum(seed) < 0) {
|
---|
| 49 | seed = mrb_fixnum_value(0 - mrb_fixnum(seed));
|
---|
| 50 | }
|
---|
| 51 | }
|
---|
| 52 |
|
---|
| 53 | mt_srand(t, (unsigned) mrb_fixnum(seed));
|
---|
| 54 |
|
---|
| 55 | return seed;
|
---|
| 56 | }
|
---|
| 57 |
|
---|
| 58 | static mrb_value
|
---|
| 59 | mrb_random_mt_rand(mrb_state *mrb, mt_state *t, mrb_value max)
|
---|
| 60 | {
|
---|
| 61 | mrb_value value;
|
---|
| 62 |
|
---|
| 63 | if (mrb_fixnum(max) == 0) {
|
---|
| 64 | value = mrb_float_value(mrb, mt_rand_real(t));
|
---|
| 65 | }
|
---|
| 66 | else {
|
---|
| 67 | value = mrb_fixnum_value(mt_rand(t) % mrb_fixnum(max));
|
---|
| 68 | }
|
---|
| 69 |
|
---|
| 70 | return value;
|
---|
| 71 | }
|
---|
| 72 |
|
---|
| 73 | static mrb_value
|
---|
| 74 | get_opt(mrb_state* mrb)
|
---|
| 75 | {
|
---|
| 76 | mrb_value arg;
|
---|
| 77 |
|
---|
| 78 | arg = mrb_nil_value();
|
---|
| 79 | mrb_get_args(mrb, "|o", &arg);
|
---|
| 80 |
|
---|
| 81 | if (!mrb_nil_p(arg)) {
|
---|
[331] | 82 | arg = mrb_check_convert_type(mrb, arg, MRB_TT_FIXNUM, "Fixnum", "to_int");
|
---|
| 83 | if (mrb_nil_p(arg)) {
|
---|
[270] | 84 | mrb_raise(mrb, E_ARGUMENT_ERROR, "invalid argument type");
|
---|
| 85 | }
|
---|
| 86 | if (mrb_fixnum(arg) < 0) {
|
---|
| 87 | arg = mrb_fixnum_value(0 - mrb_fixnum(arg));
|
---|
| 88 | }
|
---|
| 89 | }
|
---|
| 90 | return arg;
|
---|
| 91 | }
|
---|
| 92 |
|
---|
| 93 | static mrb_value
|
---|
| 94 | get_random(mrb_state *mrb) {
|
---|
| 95 | return mrb_const_get(mrb,
|
---|
| 96 | mrb_obj_value(mrb_class_get(mrb, "Random")),
|
---|
| 97 | mrb_intern_lit(mrb, "DEFAULT"));
|
---|
| 98 | }
|
---|
| 99 |
|
---|
| 100 | static mt_state *
|
---|
| 101 | get_random_state(mrb_state *mrb)
|
---|
| 102 | {
|
---|
| 103 | mrb_value random_val = get_random(mrb);
|
---|
| 104 | return DATA_GET_PTR(mrb, random_val, &mt_state_type, mt_state);
|
---|
| 105 | }
|
---|
| 106 |
|
---|
| 107 | static mrb_value
|
---|
| 108 | mrb_random_g_rand(mrb_state *mrb, mrb_value self)
|
---|
| 109 | {
|
---|
| 110 | mrb_value random = get_random(mrb);
|
---|
| 111 | return mrb_random_rand(mrb, random);
|
---|
| 112 | }
|
---|
| 113 |
|
---|
| 114 | static mrb_value
|
---|
| 115 | mrb_random_g_srand(mrb_state *mrb, mrb_value self)
|
---|
| 116 | {
|
---|
| 117 | mrb_value random = get_random(mrb);
|
---|
| 118 | return mrb_random_srand(mrb, random);
|
---|
| 119 | }
|
---|
| 120 |
|
---|
| 121 | static mrb_value
|
---|
| 122 | mrb_random_init(mrb_state *mrb, mrb_value self)
|
---|
| 123 | {
|
---|
| 124 | mrb_value seed;
|
---|
| 125 | mt_state *t;
|
---|
| 126 |
|
---|
[331] | 127 | seed = get_opt(mrb);
|
---|
| 128 |
|
---|
[270] | 129 | /* avoid memory leaks */
|
---|
| 130 | t = (mt_state*)DATA_PTR(self);
|
---|
| 131 | if (t) {
|
---|
| 132 | mrb_free(mrb, t);
|
---|
| 133 | }
|
---|
| 134 | mrb_data_init(self, NULL, &mt_state_type);
|
---|
| 135 |
|
---|
| 136 | t = (mt_state *)mrb_malloc(mrb, sizeof(mt_state));
|
---|
| 137 | t->mti = N + 1;
|
---|
| 138 |
|
---|
| 139 | seed = mrb_random_mt_srand(mrb, t, seed);
|
---|
| 140 | if (mrb_nil_p(seed)) {
|
---|
| 141 | t->has_seed = FALSE;
|
---|
| 142 | }
|
---|
| 143 | else {
|
---|
| 144 | mrb_assert(mrb_fixnum_p(seed));
|
---|
| 145 | t->has_seed = TRUE;
|
---|
| 146 | t->seed = mrb_fixnum(seed);
|
---|
| 147 | }
|
---|
| 148 |
|
---|
| 149 | mrb_data_init(self, t, &mt_state_type);
|
---|
| 150 |
|
---|
| 151 | return self;
|
---|
| 152 | }
|
---|
| 153 |
|
---|
| 154 | static void
|
---|
| 155 | mrb_random_rand_seed(mrb_state *mrb, mt_state *t)
|
---|
| 156 | {
|
---|
| 157 | if (!t->has_seed) {
|
---|
| 158 | mrb_random_mt_srand(mrb, t, mrb_nil_value());
|
---|
| 159 | }
|
---|
| 160 | }
|
---|
| 161 |
|
---|
| 162 | static mrb_value
|
---|
| 163 | mrb_random_rand(mrb_state *mrb, mrb_value self)
|
---|
| 164 | {
|
---|
| 165 | mrb_value max;
|
---|
| 166 | mt_state *t = DATA_GET_PTR(mrb, self, &mt_state_type, mt_state);
|
---|
| 167 |
|
---|
| 168 | max = get_opt(mrb);
|
---|
| 169 | mrb_random_rand_seed(mrb, t);
|
---|
| 170 | return mrb_random_mt_rand(mrb, t, max);
|
---|
| 171 | }
|
---|
| 172 |
|
---|
| 173 | static mrb_value
|
---|
| 174 | mrb_random_srand(mrb_state *mrb, mrb_value self)
|
---|
| 175 | {
|
---|
| 176 | mrb_value seed;
|
---|
| 177 | mrb_value old_seed;
|
---|
| 178 | mt_state *t = DATA_GET_PTR(mrb, self, &mt_state_type, mt_state);
|
---|
| 179 |
|
---|
| 180 | seed = get_opt(mrb);
|
---|
| 181 | seed = mrb_random_mt_srand(mrb, t, seed);
|
---|
| 182 | old_seed = t->has_seed? mrb_fixnum_value(t->seed) : mrb_nil_value();
|
---|
| 183 | if (mrb_nil_p(seed)) {
|
---|
| 184 | t->has_seed = FALSE;
|
---|
| 185 | }
|
---|
| 186 | else {
|
---|
| 187 | mrb_assert(mrb_fixnum_p(seed));
|
---|
| 188 | t->has_seed = TRUE;
|
---|
| 189 | t->seed = mrb_fixnum(seed);
|
---|
| 190 | }
|
---|
| 191 |
|
---|
| 192 | return old_seed;
|
---|
| 193 | }
|
---|
| 194 |
|
---|
| 195 | /*
|
---|
| 196 | * call-seq:
|
---|
| 197 | * ary.shuffle! -> ary
|
---|
| 198 | *
|
---|
| 199 | * Shuffles elements in self in place.
|
---|
| 200 | */
|
---|
| 201 |
|
---|
| 202 | static mrb_value
|
---|
| 203 | mrb_ary_shuffle_bang(mrb_state *mrb, mrb_value ary)
|
---|
| 204 | {
|
---|
| 205 | mrb_int i;
|
---|
| 206 | mt_state *random = NULL;
|
---|
| 207 |
|
---|
| 208 | if (RARRAY_LEN(ary) > 1) {
|
---|
| 209 | mrb_get_args(mrb, "|d", &random, &mt_state_type);
|
---|
| 210 |
|
---|
| 211 | if (random == NULL) {
|
---|
| 212 | random = get_random_state(mrb);
|
---|
| 213 | }
|
---|
| 214 | mrb_random_rand_seed(mrb, random);
|
---|
| 215 |
|
---|
| 216 | mrb_ary_modify(mrb, mrb_ary_ptr(ary));
|
---|
| 217 |
|
---|
| 218 | for (i = RARRAY_LEN(ary) - 1; i > 0; i--) {
|
---|
| 219 | mrb_int j;
|
---|
| 220 | mrb_value tmp;
|
---|
| 221 |
|
---|
| 222 | j = mrb_fixnum(mrb_random_mt_rand(mrb, random, mrb_fixnum_value(RARRAY_LEN(ary))));
|
---|
| 223 |
|
---|
| 224 | tmp = RARRAY_PTR(ary)[i];
|
---|
| 225 | mrb_ary_ptr(ary)->ptr[i] = RARRAY_PTR(ary)[j];
|
---|
| 226 | mrb_ary_ptr(ary)->ptr[j] = tmp;
|
---|
| 227 | }
|
---|
| 228 | }
|
---|
| 229 |
|
---|
| 230 | return ary;
|
---|
| 231 | }
|
---|
| 232 |
|
---|
| 233 | /*
|
---|
| 234 | * call-seq:
|
---|
| 235 | * ary.shuffle -> new_ary
|
---|
| 236 | *
|
---|
| 237 | * Returns a new array with elements of self shuffled.
|
---|
| 238 | */
|
---|
| 239 |
|
---|
| 240 | static mrb_value
|
---|
| 241 | mrb_ary_shuffle(mrb_state *mrb, mrb_value ary)
|
---|
| 242 | {
|
---|
| 243 | mrb_value new_ary = mrb_ary_new_from_values(mrb, RARRAY_LEN(ary), RARRAY_PTR(ary));
|
---|
| 244 | mrb_ary_shuffle_bang(mrb, new_ary);
|
---|
| 245 |
|
---|
| 246 | return new_ary;
|
---|
| 247 | }
|
---|
| 248 |
|
---|
| 249 | /*
|
---|
| 250 | * call-seq:
|
---|
| 251 | * ary.sample -> obj
|
---|
| 252 | * ary.sample(n) -> new_ary
|
---|
| 253 | *
|
---|
| 254 | * Choose a random element or +n+ random elements from the array.
|
---|
| 255 | *
|
---|
| 256 | * The elements are chosen by using random and unique indices into the array
|
---|
| 257 | * in order to ensure that an element doesn't repeat itself unless the array
|
---|
| 258 | * already contained duplicate elements.
|
---|
| 259 | *
|
---|
| 260 | * If the array is empty the first form returns +nil+ and the second form
|
---|
| 261 | * returns an empty array.
|
---|
| 262 | */
|
---|
| 263 |
|
---|
| 264 | static mrb_value
|
---|
| 265 | mrb_ary_sample(mrb_state *mrb, mrb_value ary)
|
---|
| 266 | {
|
---|
| 267 | mrb_int n = 0;
|
---|
| 268 | mrb_bool given;
|
---|
| 269 | mt_state *random = NULL;
|
---|
[331] | 270 | mrb_int len;
|
---|
[270] | 271 |
|
---|
| 272 | mrb_get_args(mrb, "|i?d", &n, &given, &random, &mt_state_type);
|
---|
| 273 | if (random == NULL) {
|
---|
| 274 | random = get_random_state(mrb);
|
---|
| 275 | }
|
---|
| 276 | mrb_random_rand_seed(mrb, random);
|
---|
| 277 | mt_rand(random);
|
---|
[331] | 278 | len = RARRAY_LEN(ary);
|
---|
[270] | 279 | if (!given) { /* pick one element */
|
---|
| 280 | switch (len) {
|
---|
| 281 | case 0:
|
---|
| 282 | return mrb_nil_value();
|
---|
| 283 | case 1:
|
---|
| 284 | return RARRAY_PTR(ary)[0];
|
---|
| 285 | default:
|
---|
| 286 | return RARRAY_PTR(ary)[mt_rand(random) % len];
|
---|
| 287 | }
|
---|
| 288 | }
|
---|
| 289 | else {
|
---|
| 290 | mrb_value result;
|
---|
| 291 | mrb_int i, j;
|
---|
| 292 |
|
---|
| 293 | if (n < 0) mrb_raise(mrb, E_ARGUMENT_ERROR, "negative sample number");
|
---|
| 294 | if (n > len) n = len;
|
---|
| 295 | result = mrb_ary_new_capa(mrb, n);
|
---|
| 296 | for (i=0; i<n; i++) {
|
---|
| 297 | mrb_int r;
|
---|
| 298 |
|
---|
| 299 | for (;;) {
|
---|
| 300 | retry:
|
---|
| 301 | r = mt_rand(random) % len;
|
---|
| 302 |
|
---|
| 303 | for (j=0; j<i; j++) {
|
---|
| 304 | if (mrb_fixnum(RARRAY_PTR(result)[j]) == r) {
|
---|
| 305 | goto retry; /* retry if duplicate */
|
---|
| 306 | }
|
---|
| 307 | }
|
---|
| 308 | break;
|
---|
| 309 | }
|
---|
| 310 | mrb_ary_push(mrb, result, mrb_fixnum_value(r));
|
---|
| 311 | }
|
---|
| 312 | for (i=0; i<n; i++) {
|
---|
| 313 | mrb_ary_set(mrb, result, i, RARRAY_PTR(ary)[mrb_fixnum(RARRAY_PTR(result)[i])]);
|
---|
| 314 | }
|
---|
| 315 | return result;
|
---|
| 316 | }
|
---|
| 317 | }
|
---|
| 318 |
|
---|
| 319 |
|
---|
| 320 | void mrb_mruby_random_gem_init(mrb_state *mrb)
|
---|
| 321 | {
|
---|
| 322 | struct RClass *random;
|
---|
| 323 | struct RClass *array = mrb->array_class;
|
---|
| 324 |
|
---|
| 325 | mrb_define_method(mrb, mrb->kernel_module, "rand", mrb_random_g_rand, MRB_ARGS_OPT(1));
|
---|
| 326 | mrb_define_method(mrb, mrb->kernel_module, "srand", mrb_random_g_srand, MRB_ARGS_OPT(1));
|
---|
| 327 |
|
---|
| 328 | random = mrb_define_class(mrb, "Random", mrb->object_class);
|
---|
| 329 | MRB_SET_INSTANCE_TT(random, MRB_TT_DATA);
|
---|
| 330 | mrb_define_class_method(mrb, random, "rand", mrb_random_g_rand, MRB_ARGS_OPT(1));
|
---|
| 331 | mrb_define_class_method(mrb, random, "srand", mrb_random_g_srand, MRB_ARGS_OPT(1));
|
---|
| 332 |
|
---|
| 333 | mrb_define_method(mrb, random, "initialize", mrb_random_init, MRB_ARGS_OPT(1));
|
---|
| 334 | mrb_define_method(mrb, random, "rand", mrb_random_rand, MRB_ARGS_OPT(1));
|
---|
| 335 | mrb_define_method(mrb, random, "srand", mrb_random_srand, MRB_ARGS_OPT(1));
|
---|
| 336 |
|
---|
| 337 | mrb_define_method(mrb, array, "shuffle", mrb_ary_shuffle, MRB_ARGS_OPT(1));
|
---|
| 338 | mrb_define_method(mrb, array, "shuffle!", mrb_ary_shuffle_bang, MRB_ARGS_OPT(1));
|
---|
| 339 | mrb_define_method(mrb, array, "sample", mrb_ary_sample, MRB_ARGS_OPT(2));
|
---|
| 340 |
|
---|
| 341 | mrb_const_set(mrb, mrb_obj_value(random), mrb_intern_lit(mrb, "DEFAULT"),
|
---|
| 342 | mrb_obj_new(mrb, random, 0, NULL));
|
---|
| 343 | }
|
---|
| 344 |
|
---|
| 345 | void mrb_mruby_random_gem_final(mrb_state *mrb)
|
---|
| 346 | {
|
---|
| 347 | }
|
---|