diff options
Diffstat (limited to 'activesupport/lib/active_support/module_attribute_accessors.rb')
| -rw-r--r-- | activesupport/lib/active_support/module_attribute_accessors.rb | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/module_attribute_accessors.rb b/activesupport/lib/active_support/module_attribute_accessors.rb new file mode 100644 index 0000000000..3d466e4493 --- /dev/null +++ b/activesupport/lib/active_support/module_attribute_accessors.rb @@ -0,0 +1,57 @@ +# Extends the module object with module and instance accessors for class attributes, +# just like the native attr* accessors for instance attributes. +class Module # :nodoc: + def mattr_reader(*syms) + syms.each do |sym| + class_eval <<-EOS + if ! defined? @@#{sym.id2name} + @@#{sym.id2name} = nil + end + + def self.#{sym.id2name} + @@#{sym} + end + + def #{sym.id2name} + @@#{sym} + end + + def call_#{sym.id2name} + case @@#{sym.id2name} + when Symbol then send(@@#{sym}) + when Proc then @@#{sym}.call(self) + when String then @@#{sym} + else nil + end + end + EOS + end + end + + def mattr_writer(*syms) + syms.each do |sym| + class_eval <<-EOS + if ! defined? @@#{sym.id2name} + @@#{sym.id2name} = nil + end + + def self.#{sym.id2name}=(obj) + @@#{sym.id2name} = obj + end + + def self.set_#{sym.id2name}(obj) + @@#{sym.id2name} = obj + end + + def #{sym.id2name}=(obj) + @@#{sym} = obj + end + EOS + end + end + + def mattr_accessor(*syms) + mattr_reader(*syms) + mattr_writer(*syms) + end +end
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