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module Rubydora
##
# This is an attempt to implement an Array-like
# object that calls a method after data is modified
class ArrayWithCallback < Array
##
# FIXME: It would be nice to use Rubydora::Callbacks here,
# however, this method requires instance-level callbacks
[:<<, :collect!, :map!, :compact!, :concat, :delete, :delete_at, :delete_if, :pop, :push, :reject!, :replace, :select!, :[]=, :slice!, :uniq! ].each do |method|
class_eval <<-RUBY
def #{method.to_s} *args, &blk
old = self.dup
res = super(*args, &blk)
call_on_change({:+ => self - old, :- => old - self})
res
end
RUBY
end
# duck-typing Rubydora::Callbacks @hooks and accessor
def on_change
@hooks ||= {}
@hooks[:on_change] ||= []
end
# duck-typing Rubydora::Callbacks call_* methods
def call_on_change changes = {}
self.on_change.each do |h|
h.call(self, changes)
end
end
end
end
Version data entries
70 entries across 70 versions & 1 rubygems