class Gem::Source::Local

# File lib/rubygems/source_local.rb, line 4
def initialize
  @uri = nil
end

# File lib/rubygems/source_local.rb, line 83
def download(spec, cache_dir=nil)
  load_specs :complete

  @specs.each do |name, data|
    return data[0] if data[1].spec == spec
  end

  raise Gem::Exception, "Unable to find file for '#{spec.full_name}'"
end

# File lib/rubygems/source_local.rb, line 73
def fetch_spec(name)
  load_specs :complete

  if data = @specs[name]
    data.last.spec
  else
    raise Gem::Exception, "Unable to find spec for '#{name}'"
  end
end

# File lib/rubygems/source_local.rb, line 50
def find_gem(gem_name, version=Gem::Requirement.default,
             prerelease=false)
  load_specs :complete

  found = []

  @specs.each do |n, data|
    if n.name == gem_name
      s = data[1].spec

      if version.satisfied_by?(s.version)
        if prerelease
          found << s
        elsif !s.version.prerelease?
          found << s
        end
      end
    end
  end

  found.sort_by { |s| s.version }.last
end

# File lib/rubygems/source_local.rb, line 8
def load_specs(type)
  names = []

  @specs = {}

  Dir["*.gem"].each do |file|
    begin
      pkg = Gem::Package.new(file)
    rescue SystemCallError, Gem::Package::FormatError
      # ignore
    else
      tup = pkg.spec.name_tuple
      @specs[tup] = [File.expand_path(file), pkg]

      case type
      when :released
        unless pkg.spec.version.prerelease?
          names << pkg.spec.name_tuple
        end
      when :prerelease
        if pkg.spec.version.prerelease?
          names << pkg.spec.name_tuple
        end
      when :latest
        tup = pkg.spec.name_tuple

        cur = names.find { |x| x.name == tup.name }
        if !cur
          names << tup
        elsif cur.version < tup.version
          names.delete cur
          names << tup
        end
      else
        names << pkg.spec.name_tuple
      end
    end
  end

  names
end