diff options
Diffstat (limited to 'activesupport/lib/active_support/core_ext/module')
5 files changed, 106 insertions, 26 deletions
diff --git a/activesupport/lib/active_support/core_ext/module/delegation.rb b/activesupport/lib/active_support/core_ext/module/delegation.rb index 41f9a76b13..7de824a77f 100644 --- a/activesupport/lib/active_support/core_ext/module/delegation.rb +++ b/activesupport/lib/active_support/core_ext/module/delegation.rb @@ -1,5 +1,3 @@ -require "active_support/core_ext/module/remove_method" - class Module # Provides a delegate class method to easily expose contained objects' methods # as your own. Pass one or more methods (specified as symbols or strings) @@ -108,35 +106,48 @@ class Module unless options.is_a?(Hash) && to = options[:to] raise ArgumentError, "Delegation needs a target. Supply an options hash with a :to key as the last argument (e.g. delegate :hello, :to => :greeter)." end + prefix, to, allow_nil = options[:prefix], options[:to], options[:allow_nil] - if options[:prefix] == true && options[:to].to_s =~ /^[^a-z_]/ + if prefix == true && to.to_s =~ /^[^a-z_]/ raise ArgumentError, "Can only automatically set the delegation prefix when delegating to a method." end - prefix = options[:prefix] ? "#{options[:prefix] == true ? to : options[:prefix]}_" : '' + method_prefix = + if prefix + "#{prefix == true ? to : prefix}_" + else + '' + end file, line = caller.first.split(':', 2) line = line.to_i methods.each do |method| - on_nil = - if options[:allow_nil] - 'return' - else - %(raise "#{self}##{prefix}#{method} delegated to #{to}.#{method}, but #{to} is nil: \#{self.inspect}") - end + method = method.to_s + + if allow_nil + module_eval(<<-EOS, file, line - 2) + def #{method_prefix}#{method}(*args, &block) # def customer_name(*args, &block) + if #{to} || #{to}.respond_to?(:#{method}) # if client || client.respond_to?(:name) + #{to}.__send__(:#{method}, *args, &block) # client.__send__(:name, *args, &block) + end # end + end # end + EOS + else + exception = %(raise "#{self}##{method_prefix}#{method} delegated to #{to}.#{method}, but #{to} is nil: \#{self.inspect}") - module_eval(<<-EOS, file, line - 5) - def #{prefix}#{method}(*args, &block) # def customer_name(*args, &block) - #{to}.__send__(#{method.inspect}, *args, &block) # client.__send__(:name, *args, &block) - rescue NoMethodError # rescue NoMethodError - if #{to}.nil? # if client.nil? - #{on_nil} # return # depends on :allow_nil - else # else - raise # raise - end # end - end # end - EOS + module_eval(<<-EOS, file, line - 1) + def #{method_prefix}#{method}(*args, &block) # def customer_name(*args, &block) + #{to}.__send__(:#{method}, *args, &block) # client.__send__(:name, *args, &block) + rescue NoMethodError # rescue NoMethodError + if #{to}.nil? # if client.nil? + #{exception} # # add helpful message to the exception + else # else + raise # raise + end # end + end # end + EOS + end end end end diff --git a/activesupport/lib/active_support/core_ext/module/qualified_const.rb b/activesupport/lib/active_support/core_ext/module/qualified_const.rb new file mode 100644 index 0000000000..d1a0ee2f83 --- /dev/null +++ b/activesupport/lib/active_support/core_ext/module/qualified_const.rb @@ -0,0 +1,64 @@ +require 'active_support/core_ext/string/inflections' + +#-- +# Allows code reuse in the methods below without polluting Module. +#++ +module QualifiedConstUtils + def self.raise_if_absolute(path) + raise NameError, "wrong constant name #$&" if path =~ /\A::[^:]+/ + end + + def self.names(path) + path.split('::') + end +end + +## +# Extends the API for constants to be able to deal with qualified names. Arguments +# are assumed to be relative to the receiver. +# +#-- +# Qualified names are required to be relative because we are extending existing +# methods that expect constant names, ie, relative paths of length 1. For example, +# Object.const_get("::String") raises NameError and so does qualified_const_get. +#++ +class Module + if method(:const_defined?).arity == 1 + def qualified_const_defined?(path) + QualifiedConstUtils.raise_if_absolute(path) + + QualifiedConstUtils.names(path).inject(self) do |mod, name| + return unless mod.const_defined?(name) + mod.const_get(name) + end + return true + end + else + def qualified_const_defined?(path, search_parents=true) + QualifiedConstUtils.raise_if_absolute(path) + + QualifiedConstUtils.names(path).inject(self) do |mod, name| + return unless mod.const_defined?(name, search_parents) + mod.const_get(name) + end + return true + end + end + + def qualified_const_get(path) + QualifiedConstUtils.raise_if_absolute(path) + + QualifiedConstUtils.names(path).inject(self) do |mod, name| + mod.const_get(name) + end + end + + def qualified_const_set(path, value) + QualifiedConstUtils.raise_if_absolute(path) + + const_name = path.demodulize + mod_name = path.deconstantize + mod = mod_name.empty? ? self : qualified_const_get(mod_name) + mod.const_set(const_name, value) + end +end diff --git a/activesupport/lib/active_support/core_ext/module/reachable.rb b/activesupport/lib/active_support/core_ext/module/reachable.rb index 443d2c3d53..5d3d0e9851 100644 --- a/activesupport/lib/active_support/core_ext/module/reachable.rb +++ b/activesupport/lib/active_support/core_ext/module/reachable.rb @@ -3,8 +3,6 @@ require 'active_support/core_ext/string/inflections' class Module def reachable? #:nodoc: - !anonymous? && name.constantize.equal?(self) - rescue NameError - false + !anonymous? && name.safe_constantize.equal?(self) end end diff --git a/activesupport/lib/active_support/core_ext/module/remove_method.rb b/activesupport/lib/active_support/core_ext/module/remove_method.rb index 07d7c9b018..b76bc16ee1 100644 --- a/activesupport/lib/active_support/core_ext/module/remove_method.rb +++ b/activesupport/lib/active_support/core_ext/module/remove_method.rb @@ -1,11 +1,16 @@ class Module def remove_possible_method(method) - remove_method(method) + if method_defined?(method) || private_method_defined?(method) + remove_method(method) + end rescue NameError + # If the requested method is defined on a superclass or included module, + # method_defined? returns true but remove_method throws a NameError. + # Ignore this. end def redefine_method(method, &block) remove_possible_method(method) define_method(method, &block) end -end
\ No newline at end of file +end diff --git a/activesupport/lib/active_support/core_ext/module/synchronization.rb b/activesupport/lib/active_support/core_ext/module/synchronization.rb index ed16c2f71b..061621c0ef 100644 --- a/activesupport/lib/active_support/core_ext/module/synchronization.rb +++ b/activesupport/lib/active_support/core_ext/module/synchronization.rb @@ -1,6 +1,7 @@ require 'thread' require 'active_support/core_ext/module/aliasing' require 'active_support/core_ext/array/extract_options' +require 'active_support/core_ext/module/deprecation' class Module # Synchronize access around a method, delegating synchronization to a @@ -40,4 +41,5 @@ class Module alias_method_chain method, :synchronization end end + deprecate :synchronize end |