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Integrated Yehuda's new callback code from rails

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This commit is contained in:
Peter Gumeson 2009-06-07 02:57:22 -07:00
parent 1c6e073b47
commit dc4787e905
8 changed files with 228 additions and 221 deletions
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138
lib/couchrest/support/class.rb
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@ -1,96 +1,55 @@
# Copyright (c) 2004-2008 David Heinemeier Hansson
# Extracted From
# http://github.com/rails/rails/commit/971e2438d98326c994ec6d3ef8e37b7e868ed6e2
# Extends the class object with class and instance accessors for class attributes,
# just like the native attr* accessors for instance attributes.
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
# class Person
# cattr_accessor :hair_colors
# end
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
# Allows attributes to be shared within an inheritance hierarchy, but where
# each descendant gets a copy of their parents' attributes, instead of just a
# pointer to the same. This means that the child can add elements to, for
# example, an array without those additions being shared with either their
# parent, siblings, or children, which is unlike the regular class-level
# attributes that are shared across the entire hierarchy.
# Person.hair_colors = [:brown, :black, :blonde, :red]
class Class
# Defines class-level and instance-level attribute reader.
#
# @param *syms<Array> Array of attributes to define reader for.
# @return <Array[#to_s]> List of attributes that were made into cattr_readers
#
# @api public
#
# @todo Is this inconsistent in that it does not allow you to prevent
# an instance_reader via :instance_reader => false
def cattr_reader(*syms)
syms.flatten.each do |sym|
next if sym.is_a?(Hash)
class_eval(<<-RUBY, __FILE__, __LINE__ + 1)
unless defined? @@#{sym}
@@#{sym} = nil
end
def self.#{sym}
@@#{sym}
end
def #{sym}
@@#{sym}
end
RUBY
class_eval(<<-EOS, __FILE__, __LINE__ + 1)
unless defined? @@#{sym} # unless defined? @@hair_colors
@@#{sym} = nil # @@hair_colors = nil
end # end
#
def self.#{sym} # def self.hair_colors
@@#{sym} # @@hair_colors
end # end
#
def #{sym} # def hair_colors
@@#{sym} # @@hair_colors
end # end
EOS
end
end unless Class.respond_to?(:cattr_reader)
# Defines class-level (and optionally instance-level) attribute writer.
#
# @param <Array[*#to_s, Hash{:instance_writer => Boolean}]> Array of attributes to define writer for.
# @option syms :instance_writer<Boolean> if true, instance-level attribute writer is defined.
# @return <Array[#to_s]> List of attributes that were made into cattr_writers
#
# @api public
def cattr_writer(*syms)
options = syms.last.is_a?(Hash) ? syms.pop : {}
options = syms.extract_options!
syms.flatten.each do |sym|
class_eval(<<-RUBY, __FILE__, __LINE__ + 1)
unless defined? @@#{sym}
@@#{sym} = nil
end
def self.#{sym}=(obj)
@@#{sym} = obj
end
RUBY
unless options[:instance_writer] == false
class_eval(<<-RUBY, __FILE__, __LINE__ + 1)
def #{sym}=(obj)
@@#{sym} = obj
end
RUBY
end
class_eval(<<-EOS, __FILE__, __LINE__ + 1)
unless defined? @@#{sym} # unless defined? @@hair_colors
@@#{sym} = nil # @@hair_colors = nil
end # end
#
def self.#{sym}=(obj) # def self.hair_colors=(obj)
@@#{sym} = obj # @@hair_colors = obj
end # end
#
#{" #
def #{sym}=(obj) # def hair_colors=(obj)
@@#{sym} = obj # @@hair_colors = obj
end # end
" unless options[:instance_writer] == false } # # instance writer above is generated unless options[:instance_writer] == false
EOS
end
end unless Class.respond_to?(:cattr_writer)
# Defines class-level (and optionally instance-level) attribute accessor.
#
# @param *syms<Array[*#to_s, Hash{:instance_writer => Boolean}]> Array of attributes to define accessor for.
# @option syms :instance_writer<Boolean> if true, instance-level attribute writer is defined.
# @return <Array[#to_s]> List of attributes that were made into accessors
#
# @api public
def cattr_accessor(*syms)
cattr_reader(*syms)
cattr_writer(*syms)
@ -156,6 +115,8 @@ class Class
def #{ivar}=(obj) self.class.#{ivar} = obj end
RUBY
end
self.send("#{ivar}=", yield) if block_given?
end
end unless Class.respond_to?(:extlib_inheritable_writer)
@ -168,9 +129,24 @@ class Class
# @return <Array[#to_s]> An Array of attributes turned into inheritable accessors.
#
# @api public
def extlib_inheritable_accessor(*syms)
def extlib_inheritable_accessor(*syms, &block)
extlib_inheritable_reader(*syms)
extlib_inheritable_writer(*syms)
extlib_inheritable_writer(*syms, &block)
end unless Class.respond_to?(:extlib_inheritable_accessor)
end
class Array
# Extracts options from a set of arguments. Removes and returns the last
# element in the array if it's a hash, otherwise returns a blank hash.
#
# def options(*args)
# args.extract_options!
# end
#
# options(1, 2) # => {}
# options(1, 2, :a => :b) # => {:a=>:b}
def extract_options!
last.is_a?(::Hash) ? pop : {}
end unless Array.respond_to?(:extract_options!)
end