관리-도구

편집 파일: stub_specification.rb

##
# Gem::StubSpecification reads the stub: line from the gemspec.  This prevents
# us having to eval the entire gemspec in order to find out certain
# information.

class Gem::StubSpecification < Gem::BasicSpecification
  # :nodoc:
  PREFIX = "# stub: "

OPEN_MODE = # :nodoc:
    if Object.const_defined? :Encoding then
      'r:UTF-8:-'
    else
      'r'
    end

class StubLine # :nodoc: all
    attr_reader :parts

def initialize(data)
      @parts = data[PREFIX.length..-1].split(" ")
    end

def name
      @parts[0]
    end

def version
      Gem::Version.new @parts[1]
    end

def platform
      Gem::Platform.new @parts[2]
    end

def require_paths
      @parts[3..-1].join(" ").split("\0")
    end
  end

def initialize(filename)
    self.loaded_from = filename
    @data            = nil
    @extensions      = nil
    @spec            = nil
  end

##
  # True when this gem has been activated

def activated?
    loaded = Gem.loaded_specs[name]
    loaded && loaded.version == version
  end

def build_extensions # :nodoc:
    return if default_gem?
    return if extensions.empty?

to_spec.build_extensions
  end

##
  # If the gemspec contains a stubline, returns a StubLine instance. Otherwise
  # returns the full Gem::Specification.

def data
    unless @data
      @extensions = []

open loaded_from, OPEN_MODE do |file|
        begin
          file.readline # discard encoding line
          stubline = file.readline.chomp
          if stubline.start_with?(PREFIX) then
            @data = StubLine.new stubline

@extensions = $'.split "\0" if
              /\A#{PREFIX}/ =~ file.readline.chomp
          end
        rescue EOFError
        end
      end
    end

@data ||= to_spec
  end

private :data

##
  # Extensions for this gem

def extensions
    return @extensions if @extensions

data # load

@extensions
  end

##
  # If a gem has a stub specification it doesn't need to bother with
  # compatibility with original_name gems.  It was installed with the
  # normalized name.

def find_full_gem_path # :nodoc:
    path = File.expand_path File.join gems_dir, full_name
    path.untaint
    path
  end

##
  # Full paths in the gem to add to <code>$LOAD_PATH</code> when this gem is
  # activated.

def full_require_paths
    @require_paths ||= data.require_paths

super
  end

##
  # Name of the gem

def name
    @name ||= data.name
  end

##
  # Platform of the gem

def platform
    @platform ||= data.platform
  end

##
  # Require paths of the gem

def require_paths
    @require_paths ||= data.require_paths

super
  end

##
  # The full Gem::Specification for this gem, loaded from evalling its gemspec

def to_spec
    @spec ||= Gem::Specification.load(loaded_from)
  end

##
  # Is this StubSpecification valid? i.e. have we found a stub line, OR does
  # the filename contain a valid gemspec?

def valid?
    data
  end

##
  # Version of the gem

def version
    @version ||= data.version
  end

##
  # Is there a stub line present for this StubSpecification?

def stubbed?
    data.is_a? StubLine
  end

end