How does one reflect on alias definitions. Using #method_added only
gives you the name of the alias being defined --as if it were a new
method. And it's not possible to override 'alias' b/c it's not a real
method.
Ideas?
UnboundMethod#== returns true for aliases, so hopefully:
class Module
def alias?(name)
name = name.to_s
instance_method = instance_method(name)
(instance_methods + private_instance_methods).any? do |n|
n != name && instance_method(n) == instance_method
end
end
end
Bit of a test:
require 'test/unit'
class AliasTest < Test::Unit::TestCase
def test_by_alias
klass = Class.new do
def foo
end
def bar
end
alias baz foo
end
assert klass.alias?
foo)
assert !klass.alias?
bar)
assert klass.alias?
baz)
end
def test_by_alias_method
klass = Class.new do
def foo
end
def bar
end
alias_method :baz, :foo
end
assert klass.alias?
foo)
assert !klass.alias?
bar)
assert klass.alias?
baz)
end
def test_across_inheritance
klass = Class.new{alias foo object_id}
assert klass.alias?
foo)
assert klass.alias?
object_id)
end
def test_nonalias
klass = Class.new{def foo; end}
assert !klass.alias?
foo)
end
def test_builtin
assert Array.alias?
size)
assert Array.alias?
length)
assert !Array.alias?
clear)
end
end
