Fresh start

1 files changed, 70 insertions, 0 deletions

diff --git a/jni/ruby/lib/rubygems/deprecate.rb b/jni/ruby/lib/rubygems/deprecate.rb
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+++ b/jni/ruby/lib/rubygems/deprecate.rb
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+##
+# Provides a single method +deprecate+ to be used to declare when
+# something is going away.
+#
+#     class Legacy
+#       def self.klass_method
+#         # ...
+#       end
+#
+#       def instance_method
+#         # ...
+#       end
+#
+#       extend Gem::Deprecate
+#       deprecate :instance_method, "X.z", 2011, 4
+#
+#       class << self
+#         extend Gem::Deprecate
+#         deprecate :klass_method, :none, 2011, 4
+#       end
+#     end
+
+module Gem::Deprecate
+
+  def self.skip # :nodoc:
+    @skip ||= false
+  end
+
+  def self.skip= v # :nodoc:
+    @skip = v
+  end
+
+  ##
+  # Temporarily turn off warnings. Intended for tests only.
+
+  def skip_during
+    Gem::Deprecate.skip, original = true, Gem::Deprecate.skip
+    yield
+  ensure
+    Gem::Deprecate.skip = original
+  end
+
+  ##
+  # Simple deprecation method that deprecates +name+ by wrapping it up
+  # in a dummy method. It warns on each call to the dummy method
+  # telling the user of +repl+ (unless +repl+ is :none) and the
+  # year/month that it is planned to go away.
+
+  def deprecate name, repl, year, month
+    class_eval {
+      old = "_deprecated_#{name}"
+      alias_method old, name
+      define_method name do |*args, &block|
+        klass = self.kind_of? Module
+        target = klass ? "#{self}." : "#{self.class}#"
+        msg = [ "NOTE: #{target}#{name} is deprecated",
+          repl == :none ? " with no replacement" : "; use #{repl} instead",
+          ". It will be removed on or after %4d-%02d-01." % [year, month],
+          "\n#{target}#{name} called from #{Gem.location_of_caller.join(":")}",
+        ]
+        warn "#{msg.join}." unless Gem::Deprecate.skip
+        send old, *args, &block
+      end
+    }
+  end
+
+  module_function :deprecate, :skip_during
+
+end
+