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Versions: 15
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Contents
module Enumerators
def reverse(e)
e.reverse_each
end
def has_next(e)
begin
e.peek
true
rescue StopIteration
false
end
end
def enumerator(fn, init)
Enumerator.new do |y|
value = init
y << value
loop do
value = fn.(value)
y << value
end
end.lazy
end
def repeat_enumerator(value)
Enumerators.repeat_fn_enumerator(returns(value))
end
def repeat_fn_enumerator(fn)
Enumerator.new do |y|
loop do
y << fn.()
end
end.lazy
end
def character_enumerator(string)
Enumerator.new do |y|
index = 0
loop do
raise StopIteration.new unless index < string.size
y << string[index]
index = index + 1
end
end.lazy
end
def flatten_enumerator(enumerator)
Enumerator.new do |y|
current_enumerator = empty_enumerator
loop do
until has_next(current_enumerator)
unless has_next(enumerator)
current_enumerator = empty_enumerator
break
end
current_enumerator = enumerator.next.enumerator
end
if has_next(current_enumerator)
y << current_enumerator.next
else
raise StopIteration.new
end
end
end.lazy
end
def empty_enumerator
[].lazy
end
end
Version data entries
15 entries across 15 versions & 1 rubygems