1 files changed, 196 insertions, 0 deletions
diff --git a/jni/ruby/lib/rubygems/stub_specification.rb b/jni/ruby/lib/rubygems/stub_specification.rb
new file mode 100644
index 0000000..b184d29
--- /dev/null
+++ b/jni/ruby/lib/rubygems/stub_specification.rb
@@ -0,0 +1,196 @@
+##
+# 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
+    @name            = nil
+    @spec            = nil
+  end
+
+  ##
+  # True when this gem has been activated
+
+  def activated?
+    @activated ||=
+    begin
+      loaded = Gem.loaded_specs[name]
+      loaded && loaded.version == version
+    end
+  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
+
+  def missing_extensions?
+    return false if default_gem?
+    return false if extensions.empty?
+
+    to_spec.missing_extensions?
+  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 ||= if @data then
+                Gem.loaded_specs.values.find { |spec|
+                  spec.name == name and spec.version == version
+                }
+              end
+
+    @spec ||= Gem::Specification.load(loaded_from)
+    @spec.ignored = @ignored if instance_variable_defined? :@ignored
+
+    @spec
+  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
+