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Contents
module Representable
# Allows to implement a pipeline of filters where a value gets passed in and the result gets
# passed to the next callable object.
class Pipeline < Array
Stop = Class.new
# options is mutable.
def call(input, options)
inject(input) do |memo, block|
res = evaluate(block, memo, options)
return(Stop) if Stop == res
res
end
end
private
def evaluate(block, input, options)
block.call(input, options)
end
module Macros # TODO: explicit test.
# Macro to quickly modify an array of functions via Pipeline::Insert and return a
# Pipeline instance.
def insert(functions, new_function, options)
Pipeline.new(Pipeline::Insert.(functions, new_function, options))
end
end
extend Macros
end # Pipeline
# Collect applies a pipeline to each element of input.
class Collect < Pipeline
# when stop, the element is skipped. (should that be Skip then?)
def call(input, options)
arr = []
input.each_with_index do |item_fragment, i|
result = super(item_fragment, options.merge(index: i)) # DISCUSS: NO :fragment set.
Pipeline::Stop == result ? next : arr << result
end
arr
end
class Hash < Pipeline
def call(input, options)
{}.tap do |hsh|
input.each { |key, item_fragment|
hsh[key] = super(item_fragment, options) }# DISCUSS: NO :fragment set.
end
end
end
end
end
Version data entries
5 entries across 5 versions & 3 rubygems