Resolve for specific platforms

1 files changed, 33 insertions, 0 deletions

diff --git a/lib/bundler/gem_helpers.rb b/lib/bundler/gem_helpers.rb
index 5c824ffefc..03c1f33fe2 100644
--- a/lib/bundler/gem_helpers.rb
+++ b/lib/bundler/gem_helpers.rb
@@ -28,5 +28,38 @@ module Bundler
       generic(Gem::Platform.local)
     end
     module_function :generic_local_platform
+
+    def platform_specificity_match(spec_platform, user_platform)
+      spec_platform = Gem::Platform.new(spec_platform)
+      return [-1, -1, -1] if spec_platform == user_platform
+      return [5, 5, 5] if spec_platform.nil? || spec_platform == Gem::Platform::RUBY || user_platform == Gem::Platform::RUBY
+
+      [
+        if spec_platform.os == user_platform.os
+          0
+        else
+          1
+        end,
+
+        if spec_platform.cpu == user_platform.cpu
+          0
+        elsif spec_platform.cpu == "arm" && user_platform.cpu.to_s.start_with?("arm")
+          0
+        elsif spec_platform.cpu.nil? || spec_platform.cpu == "universal"
+          1
+        else
+          2
+        end,
+
+        if spec_platform.version == user_platform.version
+          0
+        elsif spec_platform.version.nil?
+          1
+        else
+          2
+        end,
+      ]
+    end
+    module_function :platform_specificity_match
   end
 end