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Contents
require 'facet/hash/keys_to_sym'
class Module
#
# Attributing casting is useful in forcing attributes
# to specified types on read or write access. Though #cast
# is also quite general, in that any method can be cast via
# any other method.
#
# require 'facet/module/cast'
#
# class C
# attr_accessor :a
# cast :a => :to_s
# end
#
# c = C.new
# c.a = 1
# c.a #=> "1"
#
# Other examples:
#
# # simple type casting
# cast :a => :to_s
#
# # fancy type casting
# cast :a => 'to_s.capitalize'
#
#--
# Planned Funtionality:
#
# # a powerful reader!
# cast :a => fn{ |x| eval x }
#
# # a writer that type checks (using type.rb) (NOT YET FUNCTIONAL)
# cast :a= => fn{ |x| big4 x }
#
# # they can also be grouped (NOT YET FUNCTIONAL)
# cast [:x, :y] => :to_s
#++
def cast( h )
h.each { |n,c|
alias_method( :"-#{n}", n )
private :"-#{n}"
case n.to_s[-1,1]
when '='
module_eval %{
def #{n}(x)
self.send("-#{n}", x.#{c})
end
}
else
module_eval %{
def #{n}(*args)
self.send("-#{n}", *args).#{c}
end
}
end
}
made = h.keys_to_sym.keys
return *made
end
end
Version data entries
9 entries across 9 versions & 1 rubygems