From 46f375e19c7483a8a4c4f3c3b3338ed5334023bf Mon Sep 17 00:00:00 2001
From: Samuel Giddins <segiddins@segiddins.me>
Date: Fri, 5 Aug 2016 16:50:31 -0500
Subject: Refactor best-platform matching

---
 lib/bundler/gem_helpers.rb    | 51 ++++++++++++++++++++++++++++++++++++-------
 lib/bundler/match_platform.rb |  3 ++-
 lib/bundler/resolver.rb       |  3 +--
 lib/bundler/spec_set.rb       | 16 ++++++--------
 4 files changed, 53 insertions(+), 20 deletions(-)

diff --git a/lib/bundler/gem_helpers.rb b/lib/bundler/gem_helpers.rb
index 03c1f33fe2..6d926ce83f 100644
--- a/lib/bundler/gem_helpers.rb
+++ b/lib/bundler/gem_helpers.rb
@@ -31,16 +31,50 @@ module Bundler
 
     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
+      return PlatformMatch::EXACT_MATCH if spec_platform == user_platform
+      return PlatformMatch::WORST_MATCH if spec_platform.nil? || spec_platform == Gem::Platform::RUBY || user_platform == Gem::Platform::RUBY
 
-      [
+      PlatformMatch.new(
+        PlatformMatch.os_match(spec_platform, user_platform),
+        PlatformMatch.cpu_match(spec_platform, user_platform),
+        PlatformMatch.platform_version_match(spec_platform, user_platform)
+      )
+    end
+    module_function :platform_specificity_match
+
+    def select_best_platform_match(specs, platform)
+      specs.select {|spec| spec.match_platform(platform) }.
+        min_by {|spec| platform_specificity_match(spec.platform, platform) }
+    end
+    module_function :select_best_platform_match
+
+    PlatformMatch = Struct.new(:os_match, :cpu_match, :platform_version_match)
+    class PlatformMatch
+      def <=>(other)
+        return nil unless other.is_a?(PlatformMatch)
+
+        m = os_match <=> other.os_match
+        return m unless m.zero?
+
+        m = cpu_match <=> other.cpu_match
+        return m unless m.zero?
+
+        m = platform_version_match <=> other.platform_version_match
+        m
+      end
+
+      EXACT_MATCH = new(-1, -1, -1).freeze
+      WORST_MATCH = new(1_000_000, 1_000_000, 1_000_000).freeze
+
+      def self.os_match(spec_platform, user_platform)
         if spec_platform.os == user_platform.os
           0
         else
           1
-        end,
+        end
+      end
 
+      def self.cpu_match(spec_platform, user_platform)
         if spec_platform.cpu == user_platform.cpu
           0
         elsif spec_platform.cpu == "arm" && user_platform.cpu.to_s.start_with?("arm")
@@ -49,17 +83,18 @@ module Bundler
           1
         else
           2
-        end,
+        end
+      end
 
+      def self.platform_version_match(spec_platform, user_platform)
         if spec_platform.version == user_platform.version
           0
         elsif spec_platform.version.nil?
           1
         else
           2
-        end,
-      ]
+        end
+      end
     end
-    module_function :platform_specificity_match
   end
 end
diff --git a/lib/bundler/match_platform.rb b/lib/bundler/match_platform.rb
index fed418b593..0a4e4c7e3a 100644
--- a/lib/bundler/match_platform.rb
+++ b/lib/bundler/match_platform.rb
@@ -8,7 +8,8 @@ module Bundler
     def match_platform(p)
       Gem::Platform::RUBY == platform ||
         platform.nil? || p == platform ||
-        generic(Gem::Platform.new(platform)) === p
+        generic(Gem::Platform.new(platform)) === p ||
+        Gem::Platform.new(platform) === p
     end
   end
 end
diff --git a/lib/bundler/resolver.rb b/lib/bundler/resolver.rb
index 55deefbd6c..b8016b37a9 100644
--- a/lib/bundler/resolver.rb
+++ b/lib/bundler/resolver.rb
@@ -77,8 +77,7 @@ module Bundler
         @activated_platforms = []
         @dependencies = nil
         @specs        = Hash.new do |specs, platform|
-          specs[platform] = select {|spec| spec.match_platform(platform) }.
-                            min_by {|spec| platform_specificity_match(spec.platform, platform) }
+          specs[platform] = select_best_platform_match(self, platform)
         end
       end
 
diff --git a/lib/bundler/spec_set.rb b/lib/bundler/spec_set.rb
index 48699abfe4..92b1c0dac1 100644
--- a/lib/bundler/spec_set.rb
+++ b/lib/bundler/spec_set.rb
@@ -24,12 +24,13 @@ module Bundler
         dep = deps.shift
         next if handled[dep] || skip.include?(dep.name)
 
-        spec = lookup[dep.name].find do |s|
-          if match_current_platform
-            Gem::Platform.match(s.platform)
-          else
-            s.match_platform(dep.__platform)
+        spec = if match_current_platform
+          Bundler.rubygems.platforms.reverse_each do |pl|
+            match = GemHelpers.select_best_platform_match(lookup[dep.name], pl)
+            break match if match
           end
+        else
+          GemHelpers.select_best_platform_match(lookup[dep.name], dep.__platform)
         end
 
         handled[dep] = true
@@ -147,10 +148,7 @@ module Bundler
     def lookup
       @lookup ||= begin
         lookup = Hash.new {|h, k| h[k] = [] }
-        specs = @specs.sort_by do |s|
-          s.platform.to_s == "ruby" ? "\0" : s.platform.to_s
-        end
-        specs.reverse_each do |s|
+        Index.sort_specs(@specs).reverse_each do |s|
           lookup[s.name] << s
         end
         lookup
-- 
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