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unless Enumerable.method_defined? :slice_when
require 'backports/tools/arguments'
require 'backports/1.9.1/enumerator/new'
module Enumerable
def slice_when(&block)
raise ArgumentError, 'tried to create Proc object without a block' unless block
enum = self
Enumerator.new do |y|
acc = []
prev = Backports::Undefined
enum.each do |*elem|
elem = elem.first if elem.length == 1
unless prev == Backports::Undefined
if block.call(prev, elem)
y.yield acc
acc = []
end
end
acc << elem
prev = elem
end
y.yield acc unless acc.empty?
end
end
end
end
|
