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Contents
module Workarea
class SwappableList
include Enumerable
delegate :to_s, to: :@source
def initialize(source = [])
@source = Array(source)
end
def insert(index, new_val)
index = assert_index(index, :before)
@source.insert(index, new_val)
end
alias_method :insert_before, :insert
def insert_after(index, new_val)
index = assert_index(index, :after)
insert(index + 1, new_val)
end
def swap(target, new_val)
index = assert_index(target, :before)
insert(index, new_val)
@source.delete_at(index + 1)
end
def delete(target)
@source.delete(target)
end
def +(other)
self.class.new(
@source + Array(other)
)
end
def -(other)
self.class.new(
@source - Array(other)
)
end
def method_missing(method, *args, &block)
if @source.respond_to?(method)
@source.send(method, *args, &block)
else
super
end
end
def respond_to_missing?(method_name, include_private = false)
super || @source.respond_to?(method_name)
end
def deep_dup
self.class.new(@source.deep_dup)
end
private
def assert_index(index, where)
i = index.is_a?(Integer) ? index : @source.index(index)
raise "No such list item to insert #{where}: #{index.inspect}" unless i
i
end
end
end
Version data entries
59 entries across 59 versions & 1 rubygems