Sha256: e917422e7298f302b6ac32f96ba8a3db9fa5e127dc74dda6dc99d7e1ee68b259
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Versions: 19
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Stored size: 1.19 KB
Contents
#!/usr/local/bin/ruby -w
#
# == extensions/class.rb
#
# Adds methods to the builtin Class class.
#
require "extensions/_base"
ExtensionsProject.implement(Class, :autoinit) do
class Class
#
# A shorthand for the common chore of assigning initialize's parameters to
# instance variables. For example:
#
# class Circle
#
# attr_reader :radius, :location, :area
#
# autoinit(:radius, :location) do
# @area = Math::PI * @radius ** 2
# end
#
# end
#
# A TypeError is raised unless all the arguments to +autoinit+ are strings
# or symbols.
#
#--
# Taken from ruby-talk:11668, by Avi Bryant.
def autoinit(*args, &block) # :yield:
unless args.all? { |a| Symbol === a or String === a }
raise TypeError, "All arguments must be symbols or strings"
end
block = proc {} if block.nil?
define_method(:__init_proc) { block }
params = args.join(", ")
vars = args.map { |a| "@#{a}" }.join(", ")
code = %{
def initialize(#{params})
#{vars} = #{params}
instance_eval(&__init_proc)
end
}
class_eval code
end
end
end
Version data entries
19 entries across 19 versions & 4 rubygems