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[depot.git] / vendor / rails / activesupport / lib / active_support / core_ext / class / removal.rb

diff --git a/vendor/rails/activesupport/lib/active_support/core_ext/class/removal.rb b/vendor/rails/activesupport/lib/active_support/core_ext/class/removal.rb
new file mode 100644 (file)
index 0000000..10660ed
--- /dev/null
+++ b/vendor/rails/activesupport/lib/active_support/core_ext/class/removal.rb
@@ -0,0 +1,50 @@
+class Class #:nodoc:
+  
+  # Unassociates the class with its subclasses and removes the subclasses
+  # themselves.
+  #
+  #   Integer.remove_subclasses # => [Bignum, Fixnum]
+  #   Fixnum                    # => NameError: uninitialized constant Fixnum
+  def remove_subclasses
+    Object.remove_subclasses_of(self)
+  end
+
+  # Returns an array with the names of the subclasses of +self+ as strings.
+  #
+  #   Integer.subclasses # => ["Bignum", "Fixnum"]
+  def subclasses
+    Object.subclasses_of(self).map { |o| o.to_s }
+  end
+
+  # Removes the classes in +klasses+ from their parent module.
+  #
+  # Ordinary classes belong to some module via a constant. This method computes
+  # that constant name from the class name and removes it from the module it
+  # belongs to.
+  #
+  #   Object.remove_class(Integer) # => [Integer]
+  #   Integer                      # => NameError: uninitialized constant Integer
+  #
+  # Take into account that in general the class object could be still stored
+  # somewhere else.
+  #
+  #   i = Integer                  # => Integer
+  #   Object.remove_class(Integer) # => [Integer]
+  #   Integer                      # => NameError: uninitialized constant Integer
+  #   i.subclasses                 # => ["Bignum", "Fixnum"]
+  #   Fixnum.superclass            # => Integer
+  def remove_class(*klasses)
+    klasses.flatten.each do |klass|
+      # Skip this class if there is nothing bound to this name
+      next unless defined?(klass.name)
+      
+      basename = klass.to_s.split("::").last
+      parent = klass.parent
+      
+      # Skip this class if it does not match the current one bound to this name
+      next unless parent.const_defined?(basename) && klass = parent.const_get(basename)
+
+      parent.instance_eval { remove_const basename } unless parent == klass
+    end
+  end
+end