* lib/rubygems: Import RubyGems 2.1

* test/rubygems:  Ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41873 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rubygems/basic_specification.rb

@@ -0,0 +1,139 @@
+module Gem
+  # BasicSpecification is an abstract class which implements some common code used by
+  # both Specification and StubSpecification.
+  class BasicSpecification
+    def self.default_specifications_dir
+      File.join(Gem.default_dir, "specifications", "default")
+    end
+
+    ##
+    # Name of the gem
+
+    def name
+      raise NotImplementedError
+    end
+
+    ##
+    # Version of the gem
+
+    def version
+      raise NotImplementedError
+    end
+
+    ##
+    # Platform of the gem
+
+    def platform
+      raise NotImplementedError
+    end
+
+    ##
+    # Require paths of the gem
+
+    def require_paths
+      raise NotImplementedError
+    end
+
+    ##
+    # True when the gem has been activated
+
+    def activated?
+      raise NotImplementedError
+    end
+
+    ##
+    # Return a Gem::Specification from this gem
+
+    def to_spec
+      raise NotImplementedError
+    end
+
+    ##
+    # The filename of the gem specification
+    attr_reader :filename
+
+    ##
+    # Set the filename of the Specification was loaded from. +path+ is converted
+    # to a String.
+
+    def filename= path
+      @filename      = path && path.to_s
+
+      @full_gem_path = nil
+      @gems_dir      = nil
+      @base_dir      = nil
+    end
+
+    ##
+    # Return true if this spec can require +file+.
+
+    def contains_requirable_file? file
+      root     = full_gem_path
+      suffixes = Gem.suffixes
+
+      require_paths.any? do |lib|
+        base = "#{root}/#{lib}/#{file}"
+        suffixes.any? { |suf| File.file? "#{base}#{suf}" }
+      end
+    end
+
+    ##
+    # The full path to the gem (install path + full name).
+
+    def full_gem_path
+      # TODO: This is a heavily used method by gems, so we'll need
+      # to aleast just alias it to #gem_dir rather than remove it.
+      @full_gem_path ||= find_full_gem_path
+    end
+
+    # :nodoc:
+    def find_full_gem_path
+      # TODO: also, shouldn't it default to full_name if it hasn't been written?
+      path = File.expand_path File.join(gems_dir, full_name)
+      path.untaint
+      path if File.directory? path
+    end
+    private :find_full_gem_path
+
+    ##
+    # Returns the full path to the gems directory containing this spec's
+    # gem directory. eg: /usr/local/lib/ruby/1.8/gems
+
+    def gems_dir
+      # TODO: this logic seems terribly broken, but tests fail if just base_dir
+      @gems_dir ||= File.join(filename && base_dir || Gem.dir, "gems")
+    end
+
+    ##
+    # Returns the full path to the base gem directory.
+    #
+    # eg: /usr/local/lib/ruby/gems/1.8
+
+    def base_dir
+      return Gem.dir unless filename
+      @base_dir ||= if default_gem? then
+                      File.dirname File.dirname File.dirname filename
+                    else
+                      File.dirname File.dirname filename
+                    end
+    end
+
+    def default_gem?
+      filename &&
+        File.dirname(filename) == self.class.default_specifications_dir
+    end
+
+    ##
+    # Returns the full name (name-version) of this Gem.  Platform information
+    # is included (name-version-platform) if it is specified and not the
+    # default Ruby platform.
+
+    def full_name
+      if platform == Gem::Platform::RUBY or platform.nil? then
+        "#{name}-#{version}".untaint
+      else
+        "#{name}-#{version}-#{platform}".untaint
+      end
+    end
+  end
+end