Sha256: 04ca9771dfe27e8f8b1a4c878fc86ec55636bb137026eac3f48398f533145d70
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Size: 1.26 KB
Versions: 38
Compression:
Stored size: 1.26 KB
Contents
unless Range.method_defined? :bsearch
require 'backports/tools/float_integer_conversion'
class Range
def bsearch
return to_enum(:bsearch) unless block_given?
from = self.begin
to = self.end
unless from.is_a?(Numeric) && to.is_a?(Numeric)
raise TypeError, "can't do binary search for #{from.class}"
end
midpoint = nil
if from.is_a?(Integer) && to.is_a?(Integer)
convert = Proc.new{ midpoint }
else
from = Backports.float_to_integer(from.to_f)
to = Backports.float_to_integer(to.to_f)
convert = Proc.new{ Backport.integer_to_float(midpoint) }
end
to -= 1 if exclude_end?
satisfied = nil
while from <= to do
midpoint = (from + to).div(2)
result = yield(cur = convert.call)
case result
when Numeric
return cur if result == 0
result = result < 0
when true
satisfied = cur
when nil, false
# nothing to do
else
raise TypeError, "wrong argument type #{result.class} (must be numeric, true, false or nil)"
end
if result
to = midpoint - 1
else
from = midpoint + 1
end
end
satisfied
end
end
end
Version data entries
38 entries across 38 versions & 3 rubygems