class Yalphabetize::Alphabetizer

# File lib/yalphabetize/alphabetizer.rb, line 5
def initialize(stream_node, order_checker_class:)
  @stream_node = stream_node
  @order_checker_class = order_checker_class
end

# File lib/yalphabetize/alphabetizer.rb, line 10
def call
  stream_node.select(&:mapping?).each do |node|
    order_checker = order_checker_class.new_for(node)
    pair_up_children(node)
    alphabetize_children(node, order_checker)
    unpair_children(node)
  end
end

# File lib/yalphabetize/alphabetizer.rb, line 23
def alphabetize_children(node, order_checker)
  node.children.sort! do |a, b|
    order_checker.compare(a.first.value, b.first.value)
  end
end

# File lib/yalphabetize/alphabetizer.rb, line 33
def pair_up_children(node)
  children_clone = node.children.dup

  children_clone.each_slice(2) do |slice|
    node.children.push(slice)
    2.times { node.children.shift }
  end
end

# File lib/yalphabetize/alphabetizer.rb, line 29
def unpair_children(node)
  node.children.flatten!
end