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Contents
require 'corelib/enumerable'
class Range
include Enumerable
`def.$$is_range = true;`
attr_reader :begin, :end
def initialize(first, last, exclude = false)
raise ArgumentError unless first <=> last
@begin = first
@end = last
@exclude = exclude
end
def ==(other)
%x{
if (!other.$$is_range) {
return false;
}
return self.exclude === other.exclude &&
self.begin == other.begin &&
self.end == other.end;
}
end
def ===(value)
include? value
end
def cover?(value)
@begin <= value && (@exclude ? value < @end : value <= @end)
end
def each(&block)
return enum_for :each unless block_given?
current = @begin
last = @end
while current < last
yield current
current = current.succ
end
yield current if !@exclude && current == last
self
end
def eql?(other)
return false unless Range === other
@exclude === other.exclude_end? &&
@begin.eql?(other.begin) &&
@end.eql?(other.end)
end
def exclude_end?
@exclude
end
alias :first :begin
alias :include? :cover?
alias :last :end
# FIXME: currently hardcoded to assume range holds numerics
def max
if block_given?
super
else
`#@exclude ? #@end - 1 : #@end`
end
end
alias :member? :cover?
def min
if block_given?
super
else
@begin
end
end
alias member? include?
def size
_begin = @begin
_end = @end
_end -= 1 if @exclude
return nil unless Numeric === _begin && Numeric === _end
return 0 if _end < _begin
infinity = Float::INFINITY
return infinity if infinity == _begin.abs || _end.abs == infinity
(`Math.abs(_end - _begin) + 1`).to_i
end
def step(n = 1)
raise NotImplementedError
end
def to_s
`#{@begin.inspect} + (#@exclude ? '...' : '..') + #{@end.inspect}`
end
alias inspect to_s
end
Version data entries
20 entries across 20 versions & 3 rubygems