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Versions: 10
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Stored size: 1.69 KB
Contents
class Module
# Combine modules.
#
# module A
# def a; "a"; end
# end
#
# module B
# def b; "b"; end
# end
#
# C = A + B
#
# class X; include C; end
#
# X.new.a #=> "a"
# X.new.b #=> "b"
#
# Note that in the old version of traits.rb we cloned
# modules and altered their copies. Eg.
#
# def +(other)
# mod1 = other.clone
# mod2 = clone
# mod1.module_eval{ include mod2 }
# end
#
# Later it was realized that this thwarted the main
# benefit that Ruby's concept of modules has over
# traditional traits, inheritance.
#
# CREDIT: Thomas Sawyer, Robert Dober
def +(other)
base = self
Module.new do
include base
include other
end
end
# Subtract modules.
#
# TODO: Should this use all instance_methods, not just public?
#
# CREDIT: Thomas Sawyer, Robert Dober
def -(other)
case other
when Array
subtract = instance_methods(true) & other.collect{|m| m.to_s}
when Module
subtract = instance_methods(true) & other.instance_methods(true) # false?
when String, Symbol
subtract = instance_methods(true) & [other.to_s]
end
base = self
Module.new do
include base
subtract.each{ |x| undef_method x }
end
end
# Rename methods.
#
# module A
# def a; "a"; end
# end
#
# B = A * { :a => :b }
#
# class X; include B; end
#
# X.new.b #=> "a"
#
#
# Thomas Sawyer, Robert Dober
def *(rename_map)
base = self
Module.new do
include base
rename_map.each do |from, to|
alias_method to, from
undef_method from
end
end
end
end
Version data entries
10 entries across 10 versions & 1 rubygems