[270] | 1 | ##
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| 2 | # Numeric
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| 3 | #
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| 4 | # ISO 15.2.7
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| 5 | class Numeric
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| 6 | include Comparable
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| 7 | ##
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| 8 | # Returns the receiver simply.
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| 9 | #
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| 10 | # ISO 15.2.7.4.1
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| 11 | def +@
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| 12 | self
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| 13 | end
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| 14 |
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| 15 | ##
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| 16 | # Returns the receiver's value, negated.
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| 17 | #
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| 18 | # ISO 15.2.7.4.2
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| 19 | def -@
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| 20 | 0 - self
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| 21 | end
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| 22 |
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| 23 | ##
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| 24 | # Returns the absolute value of the receiver.
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| 25 | #
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| 26 | # ISO 15.2.7.4.3
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| 27 | def abs
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| 28 | if self < 0
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| 29 | -self
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| 30 | else
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| 31 | self
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| 32 | end
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| 33 | end
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| 34 | end
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| 35 |
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| 36 | ##
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| 37 | # Integral
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| 38 | #
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| 39 | # mruby special - module to share methods between Floats and Integers
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| 40 | # to make them compatible
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| 41 | module Integral
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| 42 | ##
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| 43 | # Calls the given block once for each Integer
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| 44 | # from +self+ downto +num+.
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| 45 | #
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| 46 | # ISO 15.2.8.3.15
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| 47 | def downto(num, &block)
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| 48 | return to_enum(:downto, num) unless block_given?
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| 49 |
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| 50 | i = self.to_i
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| 51 | while i >= num
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| 52 | block.call(i)
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| 53 | i -= 1
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| 54 | end
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| 55 | self
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| 56 | end
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| 57 |
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| 58 | ##
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| 59 | # Returns self + 1
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| 60 | #
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| 61 | # ISO 15.2.8.3.19
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| 62 | def next
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| 63 | self + 1
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| 64 | end
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| 65 | # ISO 15.2.8.3.21
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| 66 | alias succ next
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| 67 |
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| 68 | ##
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| 69 | # Calls the given block +self+ times.
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| 70 | #
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| 71 | # ISO 15.2.8.3.22
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| 72 | def times &block
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| 73 | return to_enum :times unless block_given?
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| 74 |
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| 75 | i = 0
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| 76 | while i < self
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| 77 | block.call i
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| 78 | i += 1
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| 79 | end
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| 80 | self
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| 81 | end
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| 82 |
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| 83 | ##
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| 84 | # Calls the given block once for each Integer
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| 85 | # from +self+ upto +num+.
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| 86 | #
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| 87 | # ISO 15.2.8.3.27
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| 88 | def upto(num, &block)
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| 89 | return to_enum(:upto, num) unless block_given?
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| 90 |
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| 91 | i = self.to_i
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| 92 | while i <= num
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| 93 | block.call(i)
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| 94 | i += 1
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| 95 | end
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| 96 | self
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| 97 | end
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| 98 |
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| 99 | ##
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| 100 | # Calls the given block from +self+ to +num+
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| 101 | # incremented by +step+ (default 1).
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| 102 | #
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| 103 | def step(num, step = 1, &block)
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| 104 | raise ArgumentError, "step can't be 0" if step == 0
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| 105 | return to_enum(:step, num, step) unless block_given?
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| 106 |
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| 107 | i = if num.kind_of? Float then self.to_f else self end
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| 108 | if step > 0
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| 109 | while i <= num
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| 110 | block.call(i)
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| 111 | i += step
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| 112 | end
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| 113 | else
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| 114 | while i >= num
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| 115 | block.call(i)
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| 116 | i += step
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| 117 | end
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| 118 | end
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| 119 | self
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| 120 | end
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| 121 | end
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| 122 |
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| 123 | ##
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| 124 | # Integer
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| 125 | #
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| 126 | # ISO 15.2.8
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| 127 | class Integer
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| 128 | include Integral
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| 129 | ##
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| 130 | # Returns the receiver simply.
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| 131 | #
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| 132 | # ISO 15.2.8.3.14
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| 133 | def ceil
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| 134 | self
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| 135 | end
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| 136 |
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| 137 | ##
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| 138 | # Returns the receiver simply.
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| 139 | #
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| 140 | # ISO 15.2.8.3.17
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| 141 | def floor
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| 142 | self
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| 143 | end
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| 144 |
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| 145 | ##
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| 146 | # Returns the receiver simply.
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| 147 | #
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| 148 | # ISO 15.2.8.3.24
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| 149 | alias round floor
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| 150 |
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| 151 | ##
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| 152 | # Returns the receiver simply.
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| 153 | #
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| 154 | # ISO 15.2.8.3.26
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| 155 | alias truncate floor
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| 156 | end
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| 157 |
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| 158 | ##
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| 159 | # Float
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| 160 | #
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| 161 | # ISO 15.2.9
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| 162 | class Float
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| 163 | include Integral
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| 164 | # mruby special - since mruby integers may be upgraded to floats,
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| 165 | # floats should be compatible to integers.
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| 166 | def >> other
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| 167 | n = self.to_i
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| 168 | other = other.to_i
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| 169 | if other < 0
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| 170 | n << -other
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| 171 | else
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| 172 | other.times { n /= 2 }
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| 173 | if n.abs < 1
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| 174 | if n >= 0
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| 175 | 0
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| 176 | else
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| 177 | -1
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| 178 | end
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| 179 | else
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| 180 | n.to_i
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| 181 | end
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| 182 | end
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| 183 | end
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| 184 | def << other
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| 185 | n = self.to_i
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| 186 | other = other.to_i
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| 187 | if other < 0
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| 188 | n >> -other
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| 189 | else
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| 190 | other.times { n *= 2 }
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| 191 | n
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| 192 | end
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| 193 | end
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| 194 | end
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