1 | #include "mruby.h"
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2 | #include "mruby/range.h"
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3 | #include <math.h>
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4 |
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5 | static mrb_bool
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6 | r_le(mrb_state *mrb, mrb_value a, mrb_value b)
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7 | {
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8 | mrb_value r = mrb_funcall(mrb, a, "<=>", 1, b); /* compare result */
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9 | /* output :a < b => -1, a = b => 0, a > b => +1 */
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10 |
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11 | if (mrb_fixnum_p(r)) {
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12 | mrb_int c = mrb_fixnum(r);
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13 | if (c == 0 || c == -1) return TRUE;
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14 | }
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15 |
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16 | return FALSE;
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17 | }
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18 |
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19 | static mrb_bool
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20 | r_lt(mrb_state *mrb, mrb_value a, mrb_value b)
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21 | {
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22 | mrb_value r = mrb_funcall(mrb, a, "<=>", 1, b);
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23 | /* output :a < b => -1, a = b => 0, a > b => +1 */
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24 |
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25 | return mrb_fixnum_p(r) && mrb_fixnum(r) == -1;
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26 | }
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27 |
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28 | /*
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29 | * call-seq:
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30 | * rng.cover?(obj) -> true or false
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31 | *
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32 | * Returns <code>true</code> if +obj+ is between the begin and end of
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33 | * the range.
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34 | *
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35 | * This tests <code>begin <= obj <= end</code> when #exclude_end? is +false+
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36 | * and <code>begin <= obj < end</code> when #exclude_end? is +true+.
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37 | *
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38 | * ("a".."z").cover?("c") #=> true
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39 | * ("a".."z").cover?("5") #=> false
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40 | * ("a".."z").cover?("cc") #=> true
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41 | */
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42 | static mrb_value
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43 | mrb_range_cover(mrb_state *mrb, mrb_value range)
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44 | {
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45 | mrb_value val;
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46 | struct RRange *r = mrb_range_ptr(range);
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47 | mrb_value beg, end;
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48 |
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49 | mrb_get_args(mrb, "o", &val);
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50 |
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51 | beg = r->edges->beg;
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52 | end = r->edges->end;
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53 |
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54 | if (r_le(mrb, beg, val)) {
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55 | if (r->excl) {
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56 | if (r_lt(mrb, val, end))
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57 | return mrb_true_value();
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58 | }
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59 | else {
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60 | if (r_le(mrb, val, end))
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61 | return mrb_true_value();
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62 | }
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63 | }
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64 |
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65 | return mrb_false_value();
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66 | }
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67 |
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68 | /*
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69 | * call-seq:
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70 | * rng.first -> obj
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71 | * rng.first(n) -> an_array
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72 | *
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73 | * Returns the first object in the range, or an array of the first +n+
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74 | * elements.
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75 | *
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76 | * (10..20).first #=> 10
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77 | * (10..20).first(3) #=> [10, 11, 12]
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78 | */
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79 | static mrb_value
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80 | mrb_range_first(mrb_state *mrb, mrb_value range)
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81 | {
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82 | mrb_int num;
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83 | mrb_value array;
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84 | struct RRange *r = mrb_range_ptr(range);
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85 |
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86 | if (mrb_get_args(mrb, "|i", &num) == 0) {
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87 | return r->edges->beg;
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88 | }
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89 |
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90 | array = mrb_funcall(mrb, range, "to_a", 0);
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91 | return mrb_funcall(mrb, array, "first", 1, mrb_fixnum_value(num));
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92 | }
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93 |
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94 | /*
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95 | * call-seq:
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96 | * rng.last -> obj
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97 | * rng.last(n) -> an_array
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98 | *
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99 | * Returns the last object in the range,
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100 | * or an array of the last +n+ elements.
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101 | *
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102 | * Note that with no arguments +last+ will return the object that defines
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103 | * the end of the range even if #exclude_end? is +true+.
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104 | *
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105 | * (10..20).last #=> 20
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106 | * (10...20).last #=> 20
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107 | * (10..20).last(3) #=> [18, 19, 20]
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108 | * (10...20).last(3) #=> [17, 18, 19]
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109 | */
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110 | static mrb_value
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111 | mrb_range_last(mrb_state *mrb, mrb_value range)
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112 | {
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113 | mrb_value num;
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114 | mrb_value array;
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115 | struct RRange *r = mrb_range_ptr(range);
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116 |
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117 | if (mrb_get_args(mrb, "|o", &num) == 0) {
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118 | return r->edges->end;
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119 | }
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120 |
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121 | array = mrb_funcall(mrb, range, "to_a", 0);
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122 | return mrb_funcall(mrb, array, "last", 1, mrb_to_int(mrb, num));
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123 | }
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124 |
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125 | /*
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126 | * call-seq:
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127 | * rng.size -> num
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128 | *
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129 | * Returns the number of elements in the range. Both the begin and the end of
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130 | * the Range must be Numeric, otherwise nil is returned.
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131 | *
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132 | * (10..20).size #=> 11
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133 | * ('a'..'z').size #=> nil
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134 | */
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135 |
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136 | static mrb_value
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137 | mrb_range_size(mrb_state *mrb, mrb_value range)
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138 | {
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139 | struct RRange *r = mrb_range_ptr(range);
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140 | mrb_value beg, end;
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141 | double beg_f, end_f;
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142 | mrb_bool num_p = TRUE;
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143 |
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144 | beg = r->edges->beg;
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145 | end = r->edges->end;
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146 | if (mrb_fixnum_p(beg)) {
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147 | beg_f = (double)mrb_fixnum(beg);
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148 | }
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149 | else if (mrb_float_p(beg)) {
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150 | beg_f = mrb_float(beg);
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151 | }
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152 | else {
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153 | num_p = FALSE;
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154 | }
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155 | if (mrb_fixnum_p(end)) {
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156 | end_f = (double)mrb_fixnum(end);
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157 | }
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158 | else if (mrb_float_p(end)) {
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159 | end_f = mrb_float(end);
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160 | }
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161 | else {
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162 | num_p = FALSE;
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163 | }
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164 | if (num_p) {
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165 | double f;
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166 |
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167 | if (beg_f > end_f) return mrb_fixnum_value(0);
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168 | f = end_f - beg_f;
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169 | if (!r->excl) {
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170 | return mrb_fixnum_value((mrb_int)ceil(f + 1));
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171 | }
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172 | return mrb_fixnum_value((mrb_int)ceil(f));
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173 | }
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174 | return mrb_nil_value();
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175 | }
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176 |
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177 | void
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178 | mrb_mruby_range_ext_gem_init(mrb_state* mrb)
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179 | {
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180 | struct RClass * s = mrb_class_get(mrb, "Range");
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181 |
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182 | mrb_define_method(mrb, s, "cover?", mrb_range_cover, MRB_ARGS_REQ(1));
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183 | mrb_define_method(mrb, s, "first", mrb_range_first, MRB_ARGS_OPT(1));
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184 | mrb_define_method(mrb, s, "last", mrb_range_last, MRB_ARGS_OPT(1));
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185 | mrb_define_method(mrb, s, "size", mrb_range_size, MRB_ARGS_NONE());
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186 | }
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187 |
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188 | void
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189 | mrb_mruby_range_ext_gem_final(mrb_state* mrb)
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190 | {
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191 | }
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