Method: Gem::Resolver.compose_sets

Defined in:
lib/rubygems/resolver.rb

.compose_sets(*sets) ⇒ Object

Combines sets into a ComposedSet that allows specification lookup in a uniform manner. If one of the sets is itself a ComposedSet its sets are flattened into the result ComposedSet.



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# File 'lib/rubygems/resolver.rb', line 59

def self.compose_sets(*sets)
  sets.compact!

  sets = sets.map do |set|
    case set
    when Gem::Resolver::BestSet then
      set
    when Gem::Resolver::ComposedSet then
      set.sets
    else
      set
    end
  end.flatten

  case sets.length
  when 0 then
    raise ArgumentError, "one set in the composition must be non-nil"
  when 1 then
    sets.first
  else
    Gem::Resolver::ComposedSet.new(*sets)
  end
end