1 files changed, 119 insertions, 0 deletions
diff --git a/lib/rubygems/resolver/dependency_request.rb b/lib/rubygems/resolver/dependency_request.rb
new file mode 100644
index 0000000000..60b338277f
--- /dev/null
+++ b/lib/rubygems/resolver/dependency_request.rb
@@ -0,0 +1,119 @@
+# frozen_string_literal: true
+
+##
+# Used Internally. Wraps a Dependency object to also track which spec
+# contained the Dependency.
+
+class Gem::Resolver::DependencyRequest
+  ##
+  # The wrapped Gem::Dependency
+
+  attr_reader :dependency
+
+  ##
+  # The request for this dependency.
+
+  attr_reader :requester
+
+  ##
+  # Creates a new DependencyRequest for +dependency+ from +requester+.
+  # +requester may be nil if the request came from a user.
+
+  def initialize(dependency, requester)
+    @dependency = dependency
+    @requester  = requester
+  end
+
+  def ==(other) # :nodoc:
+    case other
+    when Gem::Dependency
+      @dependency == other
+    when Gem::Resolver::DependencyRequest
+      @dependency == other.dependency
+    else
+      false
+    end
+  end
+
+  ##
+  # Is this dependency a development dependency?
+
+  def development?
+    @dependency.type == :development
+  end
+
+  ##
+  # Does this dependency request match +spec+?
+  #
+  # NOTE:  #match? only matches prerelease versions when #dependency is a
+  # prerelease dependency.
+
+  def match?(spec, allow_prerelease = false)
+    @dependency.match? spec, nil, allow_prerelease
+  end
+
+  ##
+  # Does this dependency request match +spec+?
+  #
+  # NOTE:  #matches_spec? matches prerelease versions.  See also #match?
+
+  def matches_spec?(spec)
+    @dependency.matches_spec? spec
+  end
+
+  ##
+  # The name of the gem this dependency request is requesting.
+
+  def name
+    @dependency.name
+  end
+
+  def type
+    @dependency.type
+  end
+
+  ##
+  # Indicate that the request is for a gem explicitly requested by the user
+
+  def explicit?
+    @requester.nil?
+  end
+
+  ##
+  # Indicate that the request is for a gem requested as a dependency of
+  # another gem
+
+  def implicit?
+    !explicit?
+  end
+
+  ##
+  # Return a String indicating who caused this request to be added (only
+  # valid for implicit requests)
+
+  def request_context
+    @requester ? @requester.request : "(unknown)"
+  end
+
+  def pretty_print(q) # :nodoc:
+    q.group 2, "[Dependency request ", "]" do
+      q.breakable
+      q.text @dependency.to_s
+
+      q.breakable
+      q.text " requested by "
+      q.pp @requester
+    end
+  end
+
+  ##
+  # The version requirement for this dependency request
+
+  def requirement
+    @dependency.requirement
+  end
+
+  def to_s # :nodoc:
+    @dependency.to_s
+  end
+end