1 files changed, 74 insertions, 0 deletions
diff --git a/lib/bundler/resolver/spec_group.rb b/lib/bundler/resolver/spec_group.rb
new file mode 100644
index 0000000000..ac6ba86c4c
--- /dev/null
+++ b/lib/bundler/resolver/spec_group.rb
@@ -0,0 +1,74 @@
+# frozen_string_literal: true
+
+module Bundler
+  class Resolver
+    class SpecGroup
+      attr_reader :specs
+
+      def initialize(specs)
+        @specs = specs
+      end
+
+      def empty?
+        @specs.empty?
+      end
+
+      def name
+        @name ||= exemplary_spec.name
+      end
+
+      def version
+        @version ||= exemplary_spec.version
+      end
+
+      def source
+        @source ||= exemplary_spec.source
+      end
+
+      def to_specs(force_ruby_platform, most_specific_locked_platform)
+        @specs.map do |s|
+          lazy_spec = LazySpecification.from_spec(s)
+          lazy_spec.force_ruby_platform = force_ruby_platform
+          lazy_spec.most_specific_locked_platform = most_specific_locked_platform
+          lazy_spec
+        end
+      end
+
+      def to_s
+        sorted_spec_names.join(", ")
+      end
+
+      def dependencies
+        @dependencies ||= @specs.flat_map(&:expanded_dependencies).uniq.sort
+      end
+
+      def ==(other)
+        sorted_spec_names == other.sorted_spec_names
+      end
+
+      def merge(other)
+        return false unless equivalent?(other)
+
+        @specs |= other.specs
+
+        true
+      end
+
+      protected
+
+      def sorted_spec_names
+        @specs.map(&:full_name).sort
+      end
+
+      private
+
+      def equivalent?(other)
+        name == other.name && version == other.version && source == other.source && dependencies == other.dependencies
+      end
+
+      def exemplary_spec
+        @specs.first
+      end
+    end
+  end
+end