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# frozen_string_literal: true
# This module handles elements in a list. All elements
# must have a different class
module Sidebars
module PositionableList
def add_element(list, element)
list << element
end
def insert_element_before(list, before_element, new_element)
index = index_of(list, before_element)
if index
list.insert(index, new_element)
else
list.unshift(new_element)
end
end
def insert_element_after(list, after_element, new_element)
index = index_of(list, after_element)
if index
list.insert(index + 1, new_element)
else
add_element(list, new_element)
end
end
private
def index_of(list, element)
list.index { |e| e.is_a?(element) }
end
end
end
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