1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
# Deprecated b/c it can be done via instance_assign(obj.to_data).
module Kernel
# Assign 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.instance_assume( 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
#
# CREDIT: Trans
def instance_assume(obj, *vars)
if vars.empty?
vars = obj.instance_variables # instance_vars | obj.instance_variables
else
vars = vars.collect do |k|
var.to_s.slice(0,1) == '@' ? var : "@#{var}"
end
vars = vars | instance_variables | obj.instance_variables
end
vars.each do |var|
instance_variable_set(var, obj.instance_variable_get(var))
end
return self # ???
end
# As with #instance_assume, but forces the setting of the object's
# instance varaibles even if the reciever doesn't have them defined.
#
# See #instance_assume.
def instance_assume!(obj, *vars)
if vars.empty?
vars = obj.instance_variables
else
vars = vars.collect do |k|
var.to_s.slice(0,1) == '@' ? var : "@#{var}"
end
vars = vars | obj.instance_variables
end
vars.each do |var|
instance_variable_set(var, obj.instance_variable_get(var))
end
return self # ???
end
# Shadow method for instance_assume.
alias :__assume__ :instance_assume if defined?(instance_assume)
end
|
