[ruby/rubygems] Add pattern matching support to Gem::Platform

https://github.com/ruby/rubygems/commit/b59917447c

2 files changed, 40 insertions, 0 deletions

diff --git a/lib/rubygems/platform.rb b/lib/rubygems/platform.rb
index e30c266fab..411512a465 100644
--- a/lib/rubygems/platform.rb
+++ b/lib/rubygems/platform.rb
@@ -146,6 +146,12 @@ class Gem::Platform
     to_a.compact.join(@cpu.nil? ? "" : "-")
   end
 
+  alias_method :deconstruct, :to_a
+
+  def deconstruct_keys(keys)
+    { cpu: @cpu, os: @os, version: @version }
+  end
+
   ##
   # Is +other+ equal to this platform?  Two platforms are equal if they have
   # the same CPU, OS and version.
diff --git a/test/rubygems/test_gem_platform.rb b/test/rubygems/test_gem_platform.rb
index a3ae919809..0f1a715ab8 100644
--- a/test/rubygems/test_gem_platform.rb
+++ b/test/rubygems/test_gem_platform.rb
@@ -683,4 +683,38 @@ class TestGemPlatform < Gem::TestCase
   def refute_local_match(name)
     refute_match Gem::Platform.local, name
   end
+
+  def test_deconstruct
+    platform = Gem::Platform.new("x86_64-linux")
+    assert_equal ["x86_64", "linux", nil], platform.deconstruct
+  end
+
+  def test_deconstruct_keys
+    platform = Gem::Platform.new("x86_64-darwin-20")
+    assert_equal({ cpu: "x86_64", os: "darwin", version: "20" }, platform.deconstruct_keys(nil))
+  end
+
+  def test_pattern_matching_array
+    platform = Gem::Platform.new("arm64-darwin-21")
+    result =
+      case platform
+      in ["arm64", "darwin", version]
+        version
+      else
+        "no match"
+      end
+    assert_equal "21", result
+  end
+
+  def test_pattern_matching_hash
+    platform = Gem::Platform.new("x86_64-linux")
+    result =
+      case platform
+      in cpu: "x86_64", os: "linux"
+        "matched"
+      else
+        "no match"
+      end
+    assert_equal "matched", result
+  end
 end