def compile(key=nil, object=nil)
method = []
method << "value = nil"
method << "halted = false"
each do |callback|
method << callback.start(key, object)
end
if config[:rescuable]
method << "rescued_error = nil"
method << "begin"
end
method << "value = yield if block_given? && !halted"
if config[:rescuable]
method << "rescue Exception => e"
method << "rescued_error = e"
method << "end"
end
reverse_each do |callback|
method << callback.end(key, object)
end
method << "raise rescued_error if rescued_error" if config[:rescuable]
method << "halted ? false : (block_given? ? value : true)"
method.compact.join("\n")
end