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_int n = mrb_cmp(mrb, a, b);
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9 |
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10 | if (n == 0 || n == -1) return TRUE;
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11 | return FALSE;
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12 | }
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13 |
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14 | static mrb_bool
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15 | r_lt(mrb_state *mrb, mrb_value a, mrb_value b)
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16 | {
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17 | return mrb_cmp(mrb, a, b) == -1;
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18 | }
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19 |
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20 | /*
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21 | * call-seq:
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22 | * rng.cover?(obj) -> true or false
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23 | *
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24 | * Returns <code>true</code> if +obj+ is between the begin and end of
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25 | * the range.
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26 | *
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27 | * This tests <code>begin <= obj <= end</code> when #exclude_end? is +false+
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28 | * and <code>begin <= obj < end</code> when #exclude_end? is +true+.
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29 | *
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30 | * ("a".."z").cover?("c") #=> true
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31 | * ("a".."z").cover?("5") #=> false
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32 | * ("a".."z").cover?("cc") #=> true
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33 | */
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34 | static mrb_value
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35 | range_cover(mrb_state *mrb, mrb_value range)
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36 | {
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37 | mrb_value val;
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38 | struct RRange *r = mrb_range_ptr(mrb, range);
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39 | mrb_value beg, end;
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40 |
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41 | mrb_get_args(mrb, "o", &val);
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42 |
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43 | beg = RANGE_BEG(r);
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44 | end = RANGE_END(r);
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45 |
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46 | if (r_le(mrb, beg, val)) {
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47 | if (RANGE_EXCL(r)) {
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48 | if (r_lt(mrb, val, end))
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49 | return mrb_true_value();
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50 | }
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51 | else {
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52 | if (r_le(mrb, val, end))
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53 | return mrb_true_value();
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54 | }
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55 | }
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56 |
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57 | return mrb_false_value();
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58 | }
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59 |
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60 | /*
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61 | * call-seq:
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62 | * rng.last -> obj
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63 | * rng.last(n) -> an_array
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64 | *
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65 | * Returns the last object in the range,
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66 | * or an array of the last +n+ elements.
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67 | *
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68 | * Note that with no arguments +last+ will return the object that defines
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69 | * the end of the range even if #exclude_end? is +true+.
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70 | *
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71 | * (10..20).last #=> 20
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72 | * (10...20).last #=> 20
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73 | * (10..20).last(3) #=> [18, 19, 20]
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74 | * (10...20).last(3) #=> [17, 18, 19]
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75 | */
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76 | static mrb_value
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77 | range_last(mrb_state *mrb, mrb_value range)
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78 | {
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79 | mrb_value num;
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80 | mrb_value array;
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81 |
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82 | if (mrb_get_args(mrb, "|o", &num) == 0) {
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83 | return mrb_range_end(mrb, range);
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84 | }
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85 |
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86 | array = mrb_funcall(mrb, range, "to_a", 0);
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87 | return mrb_funcall(mrb, array, "last", 1, mrb_to_int(mrb, num));
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88 | }
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89 |
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90 | /*
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91 | * call-seq:
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92 | * rng.size -> num
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93 | *
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94 | * Returns the number of elements in the range. Both the begin and the end of
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95 | * the Range must be Numeric, otherwise nil is returned.
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96 | *
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97 | * (10..20).size #=> 11
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98 | * ('a'..'z').size #=> nil
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99 | */
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100 |
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101 | #ifndef MRB_WITHOUT_FLOAT
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102 | static mrb_value
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103 | range_size(mrb_state *mrb, mrb_value range)
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104 | {
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105 | struct RRange *r = mrb_range_ptr(mrb, range);
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106 | mrb_value beg, end;
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107 | mrb_float beg_f, end_f;
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108 | mrb_bool num_p = TRUE;
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109 | mrb_bool excl;
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110 |
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111 | beg = RANGE_BEG(r);
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112 | end = RANGE_END(r);
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113 | excl = RANGE_EXCL(r);
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114 | if (mrb_fixnum_p(beg)) {
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115 | beg_f = (mrb_float)mrb_fixnum(beg);
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116 | }
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117 | else if (mrb_float_p(beg)) {
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118 | beg_f = mrb_float(beg);
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119 | }
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120 | else {
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121 | num_p = FALSE;
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122 | }
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123 | if (mrb_fixnum_p(end)) {
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124 | end_f = (mrb_float)mrb_fixnum(end);
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125 | }
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126 | else if (mrb_float_p(end)) {
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127 | end_f = mrb_float(end);
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128 | }
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129 | else {
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130 | num_p = FALSE;
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131 | }
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132 | if (num_p) {
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133 | mrb_float n = end_f - beg_f;
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134 | mrb_float err = (fabs(beg_f) + fabs(end_f) + fabs(end_f-beg_f)) * MRB_FLOAT_EPSILON;
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135 |
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136 | if (err>0.5) err=0.5;
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137 | if (excl) {
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138 | if (n<=0) return mrb_fixnum_value(0);
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139 | if (n<1)
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140 | n = 0;
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141 | else
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142 | n = floor(n - err);
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143 | }
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144 | else {
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145 | if (n<0) return mrb_fixnum_value(0);
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146 | n = floor(n + err);
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147 | }
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148 | if (isinf(n+1))
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149 | return mrb_float_value(mrb, INFINITY);
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150 | return mrb_fixnum_value((mrb_int)n+1);
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151 | }
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152 | return mrb_nil_value();
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153 | }
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154 | #else
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155 | static mrb_value
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156 | range_size(mrb_state *mrb, mrb_value range)
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157 | {
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158 | struct RRange *r = mrb_range_ptr(mrb, range);
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159 | mrb_value beg, end;
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160 | mrb_int excl;
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161 |
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162 | beg = RANGE_BEG(r);
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163 | end = RANGE_END(r);
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164 | excl = RANGE_EXCL(r) ? 0 : 1;
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165 |
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166 | if (mrb_fixnum_p(beg) && mrb_fixnum_p(end)) {
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167 | mrb_int a = mrb_fixnum(beg);
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168 | mrb_int b = mrb_fixnum(end);
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169 | mrb_int c = b - a + excl;
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170 |
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171 | return mrb_fixnum_value(c);
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172 | }
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173 | return mrb_nil_value();
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174 | }
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175 | #endif /* MRB_WITHOUT_FLOAT */
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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?", range_cover, MRB_ARGS_REQ(1));
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183 | mrb_define_method(mrb, s, "last", range_last, MRB_ARGS_OPT(1));
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184 | mrb_define_method(mrb, s, "size", range_size, MRB_ARGS_NONE());
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185 | }
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186 |
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187 | void
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188 | mrb_mruby_range_ext_gem_final(mrb_state* mrb)
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189 | {
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190 | }
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