1 files changed, 77 insertions, 0 deletions
diff --git a/lib/bundler/resolver/package.rb b/lib/bundler/resolver/package.rb
new file mode 100644
index 0000000000..0461328683
--- /dev/null
+++ b/lib/bundler/resolver/package.rb
@@ -0,0 +1,77 @@
+# frozen_string_literal: true
+
+module Bundler
+  class Resolver
+    #
+    # Represents a gem being resolved, in a format PubGrub likes.
+    #
+    # The class holds the following information:
+    #
+    # * Platforms this gem will be resolved on.
+    # * The locked version of this gem resolution should favor (if any).
+    # * Whether the gem should be unlocked to its latest version.
+    # * The dependency explicit set in the Gemfile for this gem (if any).
+    #
+    class Package
+      attr_reader :name, :platforms, :dependency, :locked_version
+
+      def initialize(name, platforms, locked_specs:, unlock:, prerelease: false, dependency: nil)
+        @name = name
+        @platforms = platforms
+        @locked_version = locked_specs[name].first&.version
+        @unlock = unlock
+        @dependency = dependency || Dependency.new(name, @locked_version)
+        @top_level = !dependency.nil?
+        @prerelease = @dependency.prerelease? || @locked_version&.prerelease? || prerelease ? :consider_first : :ignore
+      end
+
+      def to_s
+        @name.delete("\0")
+      end
+
+      def root?
+        false
+      end
+
+      def top_level?
+        @top_level
+      end
+
+      def meta?
+        @name.end_with?("\0")
+      end
+
+      def ==(other)
+        self.class == other.class && @name == other.name
+      end
+
+      def hash
+        @name.hash
+      end
+
+      def unlock?
+        @unlock.empty? || @unlock.include?(name)
+      end
+
+      def ignores_prereleases?
+        @prerelease == :ignore
+      end
+
+      def prerelease_specified?
+        @prerelease == :consider_first
+      end
+
+      def consider_prereleases!
+        @prerelease = :consider_last
+      end
+
+      def force_ruby_platform?
+        @dependency.force_ruby_platform
+      end
+
+      def current_platform?
+        @dependency.current_platform?
+      end
+    end
+  end
+end