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
|
module Mustermann
# Mixin that adds support for multiple versions of the same type.
# @see Mustermann::Rails
# @!visibility private
module Versions
# Checks if class has mulitple versions available and picks one that matches the version option.
# @!visibility private
def new(*args)
options = args.last.kind_of?(Hash) ? args.pop : {}
version = options.fetch(:version, nil)
options.delete(:version)
return super(*args, options) unless versions.any?
self[version].new(*args, options)
end
# @return [Hash] version to subclass mapping.
# @!visibility private
def versions
@versions ||= {}
end
# Defines a new version.
# @!visibility private
def version(*list, &block)
options = list.last.kind_of?(Hash) ? args.pop : {}
inherit_from = options.fetch(:inherit_from, nil)
superclass = self[inherit_from] || self
subclass = Class.new(superclass, &block)
list.each { |v| versions[v] = subclass }
end
# Resolve a subclass for a given version string.
# @!visibility private
def [](version)
return versions.values.last unless version
detected = versions.detect { |v,_| version.start_with?(v) }
raise ArgumentError, 'unsupported version %p' % version unless detected
detected.last
end
# @!visibility private
def name
super || superclass.name
end
# @!visibility private
def inspect
name
end
end
end
|
