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# File 'lib/rbbt/util/chain_methods.rb', line 6
def self.chain_methods_extended(base)
if not base.respond_to? :chain_prefix
metaclass = class << base
attr_accessor :chain_prefix, :chained_methods
def chained_methods
@chained_methods ||= instance_methods.select{|method| method =~ /^#{chain_prefix}/}
end
self
end
metaclass.module_eval do
def setup_chains(base)
raise "No prefix specified for #{self.to_s}" if self.chain_prefix.nil? or (String === self.chain_prefix and self.chain_prefix.empty?)
methods = self.chained_methods
return if methods.empty?
prefix = self.chain_prefix
if not base.respond_to?(:processed_chains) or base.processed_chains.nil? or not base.processed_chains.include? prefix
class << base
attr_accessor :processed_chains
end if not base.respond_to? :processed_chains
base.processed_chains = Set.new if base.processed_chains.nil?
base.processed_chains << prefix
class << base; self; end.module_eval do
methods.each do |new_method|
original = new_method.sub(prefix.to_s + '_', '')
clean_method = prefix.to_s + '_clean_' + original
original = "[]" if original == "get_brackets"
original = "[]=" if original == "set_brackets"
if base.respond_to? clean_method
raise "Method already defined: #{clean_method}. #{ prefix }"
end
begin
alias_method clean_method, original
rescue
end
alias_method original, new_method
end
end
end
end
end
if not metaclass.respond_to? :extended
metaclass.module_eval do
alias prev_chain_methods_extended extended if methods.include? "extended"
def extended(base)
if self.respond_to? :prev_chain_methods_extended
prev_chain_methods_extended(base)
end
setup_chains(base)
end
end
end
end
base.chain_prefix = base.to_s.downcase.to_sym
end
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