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 and 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 { |spec| spec.full_name }
  end
end