[331] | 1 | #include <mruby.h>
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| 2 | #include <mruby/range.h>
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[270] | 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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[439] | 8 | mrb_int n = mrb_cmp(mrb, a, b);
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[270] | 9 |
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[439] | 10 | if (n == 0 || n == -1) return TRUE;
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[270] | 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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[439] | 17 | return mrb_cmp(mrb, a, b) == -1;
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[270] | 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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[439] | 35 | range_cover(mrb_state *mrb, mrb_value range)
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[270] | 36 | {
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| 37 | mrb_value val;
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[331] | 38 | struct RRange *r = mrb_range_ptr(mrb, range);
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[270] | 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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[439] | 43 | beg = RANGE_BEG(r);
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| 44 | end = RANGE_END(r);
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[270] | 45 |
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| 46 | if (r_le(mrb, beg, val)) {
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[439] | 47 | if (RANGE_EXCL(r)) {
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[270] | 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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[439] | 77 | range_last(mrb_state *mrb, mrb_value range)
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[270] | 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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[439] | 83 | return mrb_range_end(mrb, range);
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[270] | 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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[439] | 101 | #ifndef MRB_WITHOUT_FLOAT
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[270] | 102 | static mrb_value
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[439] | 103 | range_size(mrb_state *mrb, mrb_value range)
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[270] | 104 | {
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[331] | 105 | struct RRange *r = mrb_range_ptr(mrb, range);
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[270] | 106 | mrb_value beg, end;
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[331] | 107 | mrb_float beg_f, end_f;
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[270] | 108 | mrb_bool num_p = TRUE;
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[331] | 109 | mrb_bool excl;
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[270] | 110 |
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[439] | 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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[270] | 114 | if (mrb_fixnum_p(beg)) {
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[331] | 115 | beg_f = (mrb_float)mrb_fixnum(beg);
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[270] | 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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[331] | 124 | end_f = (mrb_float)mrb_fixnum(end);
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[270] | 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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[331] | 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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[270] | 135 |
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[331] | 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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[270] | 143 | }
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[331] | 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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[270] | 151 | }
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| 152 | return mrb_nil_value();
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| 153 | }
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[439] | 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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[270] | 161 |
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[439] | 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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[270] | 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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[439] | 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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[270] | 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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