Module: Watchdog

Defined in:
lib/watchdog.rb,
lib/watchdog/error.rb,
lib/watchdog/version.rb,
lib/watchdog/german_shepard.rb

Defined Under Namespace

Modules: GermanShepard Classes: Error, ExtensionMethodExistsError, MethodExistsError

Constant Summary collapse

VERSION = 
'0.3.0'

Class Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Class Attribute Details

.extensions ⇒ Object

Returns the value of attribute extensions.



6
7
8
 
# File 'lib/watchdog.rb', line 6

def extensions
  @extensions
end

.sleep ⇒ Object

Returns the value of attribute sleep.



6
7
8
 
# File 'lib/watchdog.rb', line 6

def sleep
  @sleep
end

.subclasses ⇒ Object

Returns the value of attribute subclasses.



6
7
8
 
# File 'lib/watchdog.rb', line 6

def subclasses
  @subclasses
end

Class Method Details

.guard(obj, meth) ⇒ Object

Guards extension methods from being overwritten



12
13
14
15
16
17
18
19
 
# File 'lib/watchdog.rb', line 12

def self.guard(obj, meth)
  return if subclasses.include?(obj) || (sleep && sleep.call)
  return subclasses << obj if !extensions.key?(obj) && extensions.keys.
    any? {|e| e.is_a?(Module) && e > obj }
  if extensions[obj].instance_methods.map(&:to_sym).include?(meth)
    raise ExtensionMethodExistsError.new(meth, obj, extensions[obj])
  end
end

.setup_guard(extension, extended) ⇒ Object 



21
22
23
24
 
# File 'lib/watchdog.rb', line 21

def self.setup_guard(extension, extended)
  extensions[extended] = extension
  extended.extend GermanShepard
end

Instance Method Details

#append_features(mod) ⇒ Object 



26
27
28
29
30
31
32
33
 
# File 'lib/watchdog.rb', line 26

def append_features(mod)
  Watchdog.setup_guard(self, mod)
  existing = mod.private_instance_methods + mod.instance_methods
  (existing & self.instance_methods).each do |m|
    raise MethodExistsError.new(m, self, mod)
  end
  super
end

#extend_object(obj) ⇒ Object 



35
36
37
38
39
40
41
 
# File 'lib/watchdog.rb', line 35

def extend_object(obj)
  Watchdog.setup_guard(self, obj)
  self.instance_methods.each do |m|
    raise MethodExistsError.new(m, self, obj) if obj.respond_to?(m, true)
  end
  super
end