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author | Yehuda Katz <wycats@gmail.com> | 2009-02-24 17:25:21 -0800 |
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committer | Yehuda Katz <wycats@gmail.com> | 2009-02-24 17:25:21 -0800 |
commit | b1f078bddfecd40cce47b7db738620f2df2219c9 (patch) | |
tree | be99345865c71cc37e920c87218972a33a24cfe7 /activesupport/lib | |
parent | d6b9f8410c990b3d68d1970f1461a1d385d098d7 (diff) | |
download | rails-b1f078bddfecd40cce47b7db738620f2df2219c9.tar.gz rails-b1f078bddfecd40cce47b7db738620f2df2219c9.tar.bz2 rails-b1f078bddfecd40cce47b7db738620f2df2219c9.zip |
First, very early, AbstractController code. More to come
Diffstat (limited to 'activesupport/lib')
-rw-r--r-- | activesupport/lib/active_support/core_ext/class/inheritable_attributes.rb | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/class/inheritable_attributes.rb b/activesupport/lib/active_support/core_ext/class/inheritable_attributes.rb index 70fdde3a58..c121933050 100644 --- a/activesupport/lib/active_support/core_ext/class/inheritable_attributes.rb +++ b/activesupport/lib/active_support/core_ext/class/inheritable_attributes.rb @@ -138,3 +138,82 @@ class Class # :nodoc: alias inherited_without_inheritable_attributes inherited alias inherited inherited_with_inheritable_attributes end + +class Class + # Defines class-level inheritable attribute reader. Attributes are available to subclasses, + # each subclass has a copy of parent's attribute. + # + # @param *syms<Array[#to_s]> Array of attributes to define inheritable reader for. + # @return <Array[#to_s]> Array of attributes converted into inheritable_readers. + # + # @api public + # + # @todo Do we want to block instance_reader via :instance_reader => false + # @todo It would be preferable that we do something with a Hash passed in + # (error out or do the same as other methods above) instead of silently + # moving on). In particular, this makes the return value of this function + # less useful. + def extlib_inheritable_reader(*ivars) + instance_reader = ivars.pop[:reader] if ivars.last.is_a?(Hash) + + ivars.each do |ivar| + self.class_eval <<-RUBY, __FILE__, __LINE__ + 1 + def self.#{ivar} + return @#{ivar} if self.object_id == #{self.object_id} || defined?(@#{ivar}) + ivar = superclass.#{ivar} + return nil if ivar.nil? && !#{self}.instance_variable_defined?("@#{ivar}") + @#{ivar} = ivar && !ivar.is_a?(Module) && !ivar.is_a?(Numeric) && !ivar.is_a?(TrueClass) && !ivar.is_a?(FalseClass) ? ivar.dup : ivar + end + RUBY + unless instance_reader == false + self.class_eval <<-RUBY, __FILE__, __LINE__ + 1 + def #{ivar} + self.class.#{ivar} + end + RUBY + end + end + end + + # Defines class-level inheritable attribute writer. Attributes are available to subclasses, + # each subclass has a copy of parent's attribute. + # + # @param *syms<Array[*#to_s, Hash{:instance_writer => Boolean}]> Array of attributes to + # define inheritable writer for. + # @option syms :instance_writer<Boolean> if true, instance-level inheritable attribute writer is defined. + # @return <Array[#to_s]> An Array of the attributes that were made into inheritable writers. + # + # @api public + # + # @todo We need a style for class_eval <<-HEREDOC. I'd like to make it + # class_eval(<<-RUBY, __FILE__, __LINE__), but we should codify it somewhere. + def extlib_inheritable_writer(*ivars) + instance_writer = ivars.pop[:instance_writer] if ivars.last.is_a?(Hash) + ivars.each do |ivar| + self.class_eval <<-RUBY, __FILE__, __LINE__ + 1 + def self.#{ivar}=(obj) + @#{ivar} = obj + end + RUBY + unless instance_writer == false + self.class_eval <<-RUBY, __FILE__, __LINE__ + 1 + def #{ivar}=(obj) self.class.#{ivar} = obj end + RUBY + end + end + end + + # Defines class-level inheritable attribute accessor. Attributes are available to subclasses, + # each subclass has a copy of parent's attribute. + # + # @param *syms<Array[*#to_s, Hash{:instance_writer => Boolean}]> Array of attributes to + # define inheritable accessor for. + # @option syms :instance_writer<Boolean> if true, instance-level inheritable attribute writer is defined. + # @return <Array[#to_s]> An Array of attributes turned into inheritable accessors. + # + # @api public + def extlib_inheritable_accessor(*syms) + class_inheritable_reader(*syms) + class_inheritable_writer(*syms) + end +end
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