# frozen_string_literal: true ## # The RequirementList is used to hold the requirements being considered # while resolving a set of gems. # # The RequirementList acts like a queue where the oldest items are removed # first. class Gem::Resolver::RequirementList include Enumerable ## # Creates a new RequirementList. def initialize @exact = [] @list = [] end def initialize_copy(other) # :nodoc: @exact = @exact.dup @list = @list.dup end ## # Adds Resolver::DependencyRequest +req+ to this requirements list. def add(req) if req.requirement.exact? @exact.push req else @list.push req end req end ## # Enumerates requirements in the list def each # :nodoc: return enum_for __method__ unless block_given? @exact.each do |requirement| yield requirement end @list.each do |requirement| yield requirement end end ## # How many elements are in the list def size @exact.size + @list.size end ## # Is the list empty? def empty? @exact.empty? && @list.empty? end ## # Remove the oldest DependencyRequest from the list. def remove return @exact.shift unless @exact.empty? @list.shift end ## # Returns the oldest five entries from the list. def next5 x = @exact[0,5] x + @list[0,5 - x.size] end end