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-rw-r--r--activesupport/lib/active_support/core_ext/object/try.rb74
1 files changed, 57 insertions, 17 deletions
diff --git a/activesupport/lib/active_support/core_ext/object/try.rb b/activesupport/lib/active_support/core_ext/object/try.rb
index e0f70b9caa..69be6c4abc 100644
--- a/activesupport/lib/active_support/core_ext/object/try.rb
+++ b/activesupport/lib/active_support/core_ext/object/try.rb
@@ -1,4 +1,34 @@
+require 'delegate'
+
+module ActiveSupport
+ module Tryable #:nodoc:
+ def try(*a, &b)
+ try!(*a, &b) if a.empty? || respond_to?(a.first)
+ end
+
+ def try!(*a, &b)
+ if a.empty? && block_given?
+ if b.arity.zero?
+ instance_eval(&b)
+ else
+ yield self
+ end
+ else
+ public_send(*a, &b)
+ end
+ end
+ end
+end
+
class Object
+ include ActiveSupport::Tryable
+
+ ##
+ # :method: try
+ #
+ # :call-seq:
+ # try(*a, &b)
+ #
# Invokes the public method whose name goes as first argument just like
# +public_send+ does, except that if the receiver does not respond to it the
# call returns +nil+ rather than raising an exception.
@@ -56,30 +86,40 @@ class Object
#
# Please also note that +try+ is defined on +Object+. Therefore, it won't work
# with instances of classes that do not have +Object+ among their ancestors,
- # like direct subclasses of +BasicObject+. For example, using +try+ with
- # +SimpleDelegator+ will delegate +try+ to the target instead of calling it on
- # the delegator itself.
- def try(*a, &b)
- try!(*a, &b) if a.empty? || respond_to?(a.first)
- end
+ # like direct subclasses of +BasicObject+.
+ ##
+ # :method: try!
+ #
+ # :call-seq:
+ # try!(*a, &b)
+ #
# Same as #try, but raises a NoMethodError exception if the receiver is
# not +nil+ and does not implement the tried method.
#
# "a".try!(:upcase) # => "A"
# nil.try!(:upcase) # => nil
# 123.try!(:upcase) # => NoMethodError: undefined method `upcase' for 123:Fixnum
- def try!(*a, &b)
- if a.empty? && block_given?
- if b.arity.zero?
- instance_eval(&b)
- else
- yield self
- end
- else
- public_send(*a, &b)
- end
- end
+end
+
+class Delegator
+ include ActiveSupport::Tryable
+
+ ##
+ # :method: try
+ #
+ # :call-seq:
+ # try(a*, &b)
+ #
+ # See Object#try
+
+ ##
+ # :method: try!
+ #
+ # :call-seq:
+ # try!(a*, &b)
+ #
+ # See Object#try!
end
class NilClass