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Versions: 12
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Contents
class Module
# Custom alias_method_chain that won't cause inifinite recursion if
# called twice.
# Calling alias_method_chain on alias_method_chain
# was just way to confusing, so I copied it :-/
def alias_method_chain(target, feature)
# Strip out punctuation on predicates or bang methods since
# e.g. target?_without_feature is not a valid method name.
aliased_target, punctuation = target.to_s.sub(/([?!=])$/, ''), $1
yield(aliased_target, punctuation) if block_given?
without = "#{aliased_target}_without_#{feature}#{punctuation}"
unless instance_methods.include?(without)
alias_method without, target
alias_method target, "#{aliased_target}_with_#{feature}#{punctuation}"
end
end
# Fix delegate so it doesn't go bang if 'to' is nil
def delegate(*methods)
options = methods.pop
unless options.is_a?(Hash) && to = options[:to]
raise ArgumentError, ("Delegation needs a target. Supply an options hash with a :to key" +
"as the last argument (e.g. delegate :hello, :to => :greeter).")
end
methods.each do |method|
module_eval(<<-EOS, "(__DELEGATION__)", 1)
def #{method}(*args, &block)
(_to = #{to}) && _to.__send__(#{method.inspect}, *args, &block)
end
EOS
end
end
end
Version data entries
12 entries across 12 versions & 1 rubygems