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
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
#
# forwardable.rb -
# $Release Version: 1.1$
# $Revision$
# $Date$
# by Keiju ISHITSUKA(keiju@ishitsuka.com)
# original definition by delegator.rb
# --
# Usage:
#
# class Foo
# extend Forwardable
#
# def_delegators("@out", "printf", "print")
# def_delegators(:@in, :gets)
# def_delegator(:@contents, :[], "content_at")
# end
# f = Foo.new
# f.printf ...
# f.gets
# f.content_at(1)
#
# g = Goo.new
# g.extend SingleForwardable
# g.def_delegator("@out", :puts)
# g.puts ...
#
#
module Forwardable
@debug = nil
class<<self
attr_accessor :debug
end
def def_instance_delegators(accessor, *methods)
for method in methods
def_instance_delegator(accessor, method)
end
end
def def_instance_delegator(accessor, method, ali = method)
accessor = accessor.id2name if accessor.kind_of?(Integer)
method = method.id2name if method.kind_of?(Integer)
ali = ali.id2name if ali.kind_of?(Integer)
module_eval(<<-EOS, "(__FORWARDABLE__)", 1)
def #{ali}(*args, &block)
begin
#{accessor}.__send__(:#{method}, *args, &block)
rescue Exception
$@.delete_if{|s| /^\\(__FORWARDABLE__\\):/ =~ s} unless Forwardable::debug
Kernel::raise
end
end
EOS
end
alias def_delegators def_instance_delegators
alias def_delegator def_instance_delegator
end
module SingleForwardable
def def_singleton_delegators(accessor, *methods)
for method in methods
def_singleton_delegator(accessor, method)
end
end
def def_singleton_delegator(accessor, method, ali = method)
accessor = accessor.id2name if accessor.kind_of?(Integer)
method = method.id2name if method.kind_of?(Integer)
ali = ali.id2name if ali.kind_of?(Integer)
instance_eval(<<-EOS, "(__FORWARDABLE__)", 1)
def #{ali}(*args, &block)
begin
#{accessor}.__send__(:#{method}, *args,&block)
rescue Exception
$@.delete_if{|s| /^\\(__FORWARDABLE__\\):/ =~ s} unless Forwardable::debug
Kernel::raise
end
end
EOS
end
alias def_delegators def_singleton_delegators
alias def_delegator def_singleton_delegator
end
|
