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rails--rails/activesupport/lib/active_support/option_merger.rb

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require 'active_support/core_ext/hash/deep_merge'
module ActiveSupport
class OptionMerger #:nodoc:
instance_methods.each do |method|
undef_method(method) if method !~ /^(__|instance_eval|class|object_id)/
end
def initialize(context, options)
@context, @options = context, options
end
private
def method_missing(method, *arguments, &block)
if arguments.first.is_a?(Proc)
proc = arguments.pop
arguments << lambda { |*args| @options.deep_merge(proc.call(*args)) }
else
arguments << (arguments.last.respond_to?(:to_hash) ? @options.deep_merge(arguments.pop) : @options.dup)
end
@context.__send__(method, *arguments, &block)
end
end
end