class Gem::Resolver::LockSet

def add(name, version, platform) # :nodoc:
  version = Gem::Version.new version
  specs = [
    Gem::Resolver::LockSpecification.new(self, name, version, @sources, platform),
  ]
  @specs.concat specs
  specs
end

def find_all(req)
  @specs.select do |spec|
    req.match? spec
  end
end

def initialize(sources)
  super()
  @sources = sources.map do |source|
    Gem::Source::Lock.new source
  end
  @specs = []
end

def load_spec(name, version, platform, source) # :nodoc:
  dep = Gem::Dependency.new name, version
  found = @specs.find do |spec|
    dep.matches_spec?(spec) && spec.platform == platform
  end
  tuple = Gem::NameTuple.new found.name, found.version, found.platform
  found.source.fetch_spec tuple
end

def pretty_print(q) # :nodoc:
  q.group 2, "[LockSet", "]" do
    q.breakable
    q.text "source:"
    q.breakable
    q.pp @source
    q.breakable
    q.text "specs:"
    q.breakable
    q.pp @specs.map(&:full_name)
  end
end