[331] | 1 | #include <mruby.h>
|
---|
| 2 | #include <mruby/range.h>
|
---|
[270] | 3 | #include <math.h>
|
---|
[331] | 4 | #include <float.h>
|
---|
[270] | 5 |
|
---|
| 6 | static mrb_bool
|
---|
| 7 | r_le(mrb_state *mrb, mrb_value a, mrb_value b)
|
---|
| 8 | {
|
---|
| 9 | mrb_value r = mrb_funcall(mrb, a, "<=>", 1, b); /* compare result */
|
---|
| 10 | /* output :a < b => -1, a = b => 0, a > b => +1 */
|
---|
| 11 |
|
---|
| 12 | if (mrb_fixnum_p(r)) {
|
---|
| 13 | mrb_int c = mrb_fixnum(r);
|
---|
| 14 | if (c == 0 || c == -1) return TRUE;
|
---|
| 15 | }
|
---|
| 16 |
|
---|
| 17 | return FALSE;
|
---|
| 18 | }
|
---|
| 19 |
|
---|
| 20 | static mrb_bool
|
---|
| 21 | r_lt(mrb_state *mrb, mrb_value a, mrb_value b)
|
---|
| 22 | {
|
---|
| 23 | mrb_value r = mrb_funcall(mrb, a, "<=>", 1, b);
|
---|
| 24 | /* output :a < b => -1, a = b => 0, a > b => +1 */
|
---|
| 25 |
|
---|
| 26 | return mrb_fixnum_p(r) && mrb_fixnum(r) == -1;
|
---|
| 27 | }
|
---|
| 28 |
|
---|
| 29 | /*
|
---|
| 30 | * call-seq:
|
---|
| 31 | * rng.cover?(obj) -> true or false
|
---|
| 32 | *
|
---|
| 33 | * Returns <code>true</code> if +obj+ is between the begin and end of
|
---|
| 34 | * the range.
|
---|
| 35 | *
|
---|
| 36 | * This tests <code>begin <= obj <= end</code> when #exclude_end? is +false+
|
---|
| 37 | * and <code>begin <= obj < end</code> when #exclude_end? is +true+.
|
---|
| 38 | *
|
---|
| 39 | * ("a".."z").cover?("c") #=> true
|
---|
| 40 | * ("a".."z").cover?("5") #=> false
|
---|
| 41 | * ("a".."z").cover?("cc") #=> true
|
---|
| 42 | */
|
---|
| 43 | static mrb_value
|
---|
| 44 | mrb_range_cover(mrb_state *mrb, mrb_value range)
|
---|
| 45 | {
|
---|
| 46 | mrb_value val;
|
---|
[331] | 47 | struct RRange *r = mrb_range_ptr(mrb, range);
|
---|
[270] | 48 | mrb_value beg, end;
|
---|
| 49 |
|
---|
| 50 | mrb_get_args(mrb, "o", &val);
|
---|
| 51 |
|
---|
| 52 | beg = r->edges->beg;
|
---|
| 53 | end = r->edges->end;
|
---|
| 54 |
|
---|
| 55 | if (r_le(mrb, beg, val)) {
|
---|
| 56 | if (r->excl) {
|
---|
| 57 | if (r_lt(mrb, val, end))
|
---|
| 58 | return mrb_true_value();
|
---|
| 59 | }
|
---|
| 60 | else {
|
---|
| 61 | if (r_le(mrb, val, end))
|
---|
| 62 | return mrb_true_value();
|
---|
| 63 | }
|
---|
| 64 | }
|
---|
| 65 |
|
---|
| 66 | return mrb_false_value();
|
---|
| 67 | }
|
---|
| 68 |
|
---|
| 69 | /*
|
---|
| 70 | * call-seq:
|
---|
| 71 | * rng.last -> obj
|
---|
| 72 | * rng.last(n) -> an_array
|
---|
| 73 | *
|
---|
| 74 | * Returns the last object in the range,
|
---|
| 75 | * or an array of the last +n+ elements.
|
---|
| 76 | *
|
---|
| 77 | * Note that with no arguments +last+ will return the object that defines
|
---|
| 78 | * the end of the range even if #exclude_end? is +true+.
|
---|
| 79 | *
|
---|
| 80 | * (10..20).last #=> 20
|
---|
| 81 | * (10...20).last #=> 20
|
---|
| 82 | * (10..20).last(3) #=> [18, 19, 20]
|
---|
| 83 | * (10...20).last(3) #=> [17, 18, 19]
|
---|
| 84 | */
|
---|
| 85 | static mrb_value
|
---|
| 86 | mrb_range_last(mrb_state *mrb, mrb_value range)
|
---|
| 87 | {
|
---|
| 88 | mrb_value num;
|
---|
| 89 | mrb_value array;
|
---|
[331] | 90 | struct RRange *r = mrb_range_ptr(mrb, range);
|
---|
[270] | 91 |
|
---|
| 92 | if (mrb_get_args(mrb, "|o", &num) == 0) {
|
---|
| 93 | return r->edges->end;
|
---|
| 94 | }
|
---|
| 95 |
|
---|
| 96 | array = mrb_funcall(mrb, range, "to_a", 0);
|
---|
| 97 | return mrb_funcall(mrb, array, "last", 1, mrb_to_int(mrb, num));
|
---|
| 98 | }
|
---|
| 99 |
|
---|
| 100 | /*
|
---|
| 101 | * call-seq:
|
---|
| 102 | * rng.size -> num
|
---|
| 103 | *
|
---|
| 104 | * Returns the number of elements in the range. Both the begin and the end of
|
---|
| 105 | * the Range must be Numeric, otherwise nil is returned.
|
---|
| 106 | *
|
---|
| 107 | * (10..20).size #=> 11
|
---|
| 108 | * ('a'..'z').size #=> nil
|
---|
| 109 | */
|
---|
| 110 |
|
---|
| 111 | static mrb_value
|
---|
| 112 | mrb_range_size(mrb_state *mrb, mrb_value range)
|
---|
| 113 | {
|
---|
[331] | 114 | struct RRange *r = mrb_range_ptr(mrb, range);
|
---|
[270] | 115 | mrb_value beg, end;
|
---|
[331] | 116 | mrb_float beg_f, end_f;
|
---|
[270] | 117 | mrb_bool num_p = TRUE;
|
---|
[331] | 118 | mrb_bool excl;
|
---|
[270] | 119 |
|
---|
| 120 | beg = r->edges->beg;
|
---|
| 121 | end = r->edges->end;
|
---|
[331] | 122 | excl = r->excl;
|
---|
[270] | 123 | if (mrb_fixnum_p(beg)) {
|
---|
[331] | 124 | beg_f = (mrb_float)mrb_fixnum(beg);
|
---|
[270] | 125 | }
|
---|
| 126 | else if (mrb_float_p(beg)) {
|
---|
| 127 | beg_f = mrb_float(beg);
|
---|
| 128 | }
|
---|
| 129 | else {
|
---|
| 130 | num_p = FALSE;
|
---|
| 131 | }
|
---|
| 132 | if (mrb_fixnum_p(end)) {
|
---|
[331] | 133 | end_f = (mrb_float)mrb_fixnum(end);
|
---|
[270] | 134 | }
|
---|
| 135 | else if (mrb_float_p(end)) {
|
---|
| 136 | end_f = mrb_float(end);
|
---|
| 137 | }
|
---|
| 138 | else {
|
---|
| 139 | num_p = FALSE;
|
---|
| 140 | }
|
---|
| 141 | if (num_p) {
|
---|
[331] | 142 | mrb_float n = end_f - beg_f;
|
---|
| 143 | mrb_float err = (fabs(beg_f) + fabs(end_f) + fabs(end_f-beg_f)) * MRB_FLOAT_EPSILON;
|
---|
[270] | 144 |
|
---|
[331] | 145 | if (err>0.5) err=0.5;
|
---|
| 146 | if (excl) {
|
---|
| 147 | if (n<=0) return mrb_fixnum_value(0);
|
---|
| 148 | if (n<1)
|
---|
| 149 | n = 0;
|
---|
| 150 | else
|
---|
| 151 | n = floor(n - err);
|
---|
[270] | 152 | }
|
---|
[331] | 153 | else {
|
---|
| 154 | if (n<0) return mrb_fixnum_value(0);
|
---|
| 155 | n = floor(n + err);
|
---|
| 156 | }
|
---|
| 157 | if (isinf(n+1))
|
---|
| 158 | return mrb_float_value(mrb, INFINITY);
|
---|
| 159 | return mrb_fixnum_value((mrb_int)n+1);
|
---|
[270] | 160 | }
|
---|
| 161 | return mrb_nil_value();
|
---|
| 162 | }
|
---|
| 163 |
|
---|
| 164 | void
|
---|
| 165 | mrb_mruby_range_ext_gem_init(mrb_state* mrb)
|
---|
| 166 | {
|
---|
| 167 | struct RClass * s = mrb_class_get(mrb, "Range");
|
---|
| 168 |
|
---|
| 169 | mrb_define_method(mrb, s, "cover?", mrb_range_cover, MRB_ARGS_REQ(1));
|
---|
| 170 | mrb_define_method(mrb, s, "last", mrb_range_last, MRB_ARGS_OPT(1));
|
---|
| 171 | mrb_define_method(mrb, s, "size", mrb_range_size, MRB_ARGS_NONE());
|
---|
| 172 | }
|
---|
| 173 |
|
---|
| 174 | void
|
---|
| 175 | mrb_mruby_range_ext_gem_final(mrb_state* mrb)
|
---|
| 176 | {
|
---|
| 177 | }
|
---|