* lib/rubygems: Update to RubyGems master 4bdc4f2. Important changes

in this commit:

  RubyGems now chooses the test server port reliably.  Patch by akr.

  Partial implementation of bundler's Gemfile format.

  Refactorings to improve the new resolver.

  Fixes bugs in the resolver.

* test/rubygems:  Tests for the above.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43643 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rubygems/dependency_resolver/lock_set.rb

@@ -0,0 +1,60 @@
+##
+# A set of gems from a gem dependencies lockfile.
+
+class Gem::DependencyResolver::LockSet < Gem::DependencyResolver::Set
+
+  attr_reader :specs # :nodoc:
+
+  ##
+  # Creates a new LockSet from the given +source+
+
+  def initialize source
+    @source = source
+    @specs  = []
+  end
+
+  ##
+  # Creates a new IndexSpecification in this set using the given +name+,
+  # +version+ and +platform+.
+  #
+  # The specification's set will be the current set, and the source will be
+  # the current set's source.
+
+  def add name, version, platform # :nodoc:
+    version = Gem::Version.new version
+
+    spec =
+      Gem::DependencyResolver::IndexSpecification.new self, name, version,
+                                                      @source, platform
+
+    @specs << spec
+  end
+
+  ##
+  # Returns an Array of IndexSpecification objects matching the
+  # DependencyRequest +req+.
+
+  def find_all req
+    @specs.select do |spec|
+      req.matches_spec? spec
+    end
+  end
+
+  ##
+  # Loads a Gem::Specification with the given +name+, +version+ and
+  # +platform+.  +source+ is ignored.
+
+  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
+
+end
+