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# frozen_string_literal: true
module Gitlab
module RelativePositioning
IllegalRange = Class.new(ArgumentError)
class Range
attr_reader :lhs, :rhs
def open_on_left?
lhs.nil?
end
def open_on_right?
rhs.nil?
end
def cover?(item_context)
return false unless item_context
return false unless item_context.positioned?
return true if item_context.object == lhs&.object
return true if item_context.object == rhs&.object
pos = item_context.relative_position
return lhs.relative_position < pos if open_on_right?
return pos < rhs.relative_position if open_on_left?
lhs.relative_position < pos && pos < rhs.relative_position
end
def ==(other)
other.is_a?(RelativePositioning::Range) && lhs == other.lhs && rhs == other.rhs
end
end
def self.range(lhs, rhs)
if lhs && rhs
ClosedRange.new(lhs, rhs)
elsif lhs
StartingFrom.new(lhs)
elsif rhs
EndingAt.new(rhs)
else
raise IllegalRange, 'One of rhs or lhs must be provided' unless lhs && rhs
end
end
class ClosedRange < RelativePositioning::Range
def initialize(lhs, rhs)
@lhs, @rhs = lhs, rhs
raise IllegalRange, 'Either lhs or rhs is missing' unless lhs && rhs
raise IllegalRange, 'lhs and rhs cannot be the same object' if lhs == rhs
end
end
class StartingFrom < RelativePositioning::Range
include Gitlab::Utils::StrongMemoize
def initialize(lhs)
@lhs = lhs
raise IllegalRange, 'lhs is required' unless lhs
end
def rhs
strong_memoize(:rhs) { lhs.rhs_neighbour }
end
end
class EndingAt < RelativePositioning::Range
include Gitlab::Utils::StrongMemoize
def initialize(rhs)
@rhs = rhs
raise IllegalRange, 'rhs is required' unless rhs
end
def lhs
strong_memoize(:lhs) { rhs.lhs_neighbour }
end
end
end
end
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