1 files changed, 50 insertions, 0 deletions
diff --git a/lib/bundler/resolver/base.rb b/lib/bundler/resolver/base.rb
new file mode 100644
index 0000000000..84e087b0ae
--- /dev/null
+++ b/lib/bundler/resolver/base.rb
@@ -0,0 +1,50 @@
+# frozen_string_literal: true
+
+module Bundler
+  class Resolver
+    class Base
+      def initialize(base, additional_base_requirements)
+        @base = base
+        @additional_base_requirements = additional_base_requirements
+      end
+
+      def [](name)
+        @base[name]
+      end
+
+      def delete(spec)
+        @base.delete(spec)
+      end
+
+      def base_requirements
+        @base_requirements ||= build_base_requirements
+      end
+
+      def unlock_deps(deps)
+        exact, lower_bound = deps.partition(&:specific?)
+
+        exact.each do |exact_dep|
+          @base.delete_by_name_and_version(exact_dep.name, exact_dep.requirement.requirements.first.last)
+        end
+
+        lower_bound.each do |lower_bound_dep|
+          @additional_base_requirements.delete(lower_bound_dep)
+        end
+
+        @base_requirements = nil
+      end
+
+      private
+
+      def build_base_requirements
+        base_requirements = {}
+        @base.each do |ls|
+          dep = Dependency.new(ls.name, ls.version)
+          base_requirements[ls.name] = DepProxy.get_proxy(dep, ls.platform)
+        end
+        @additional_base_requirements.each {|d| base_requirements[d.name] = d }
+        base_requirements
+      end
+    end
+  end
+end