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