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Contents
require 'facet/kernel/assign_with'
module Kernel
# Set instance vars using another object.
#
# class O
# attr_accessor :d
# def initialize( a, b, c, d)
# @a = a
# @b = b
# @c = c
# @d = d
# end
# end
# o1 = O.new(1,2,3,4)
# o2 = O.new(0,0,0,0)
#
# o2.assign_from( o1, '@a', '@b', '@c', '@d' )
# o2.instance_eval{ @a } #=> 1
# o2.instance_eval{ @b } #=> 2
# o2.instance_eval{ @c } #=> 3
# o2.instance_eval{ @d } #=> 4
#
# See also #assign_with.
#
def assign_from(obj, *fields)
force = false
case fields.last when true, false, nil
force = fields.pop
end
unless fields.empty?
fields.each do |k|
var = k.to_s
var = var.slice(0,1) == '@' ? var : "@#{var}"
if obj.instance_variables.include?(var)
self.instance_variable_set( var, obj.instance_variable_get(var) )
end
end
else
if force
fields = obj.instance_variables
else
fields = instance_variables | obj.instance_variables
end
fields.each do |var|
instance_variable_set( var, obj.instance_variable_get(var) )
end
end
return self
end
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TCKernel < Test::Unit::TestCase
def test_assign_from
o = Object.new
o.instance_eval{ @z=0; @a=1; @b=2 } #; @@a=3 }
assign_from( o, "z", "@a", "@b" ) #, "@@a" )
assert_equal( 1, @a )
assert_equal( 2, @b )
#assert_equal( 3, @@a )
end
end
=end
Version data entries
13 entries across 13 versions & 1 rubygems