From da85251f85420d3a906a1eb949b73bb286122ea9 Mon Sep 17 00:00:00 2001 From: Joshua Peek Date: Sat, 19 Jul 2008 17:32:22 -0500 Subject: Refactor ActiveSupport::Dependencies injector so it would be possible to disable it --- activesupport/lib/active_support/dependencies.rb | 218 ++++++++++++----------- 1 file changed, 114 insertions(+), 104 deletions(-) (limited to 'activesupport/lib/active_support') diff --git a/activesupport/lib/active_support/dependencies.rb b/activesupport/lib/active_support/dependencies.rb index 2f3fa72bb4..e3d4f3d7eb 100644 --- a/activesupport/lib/active_support/dependencies.rb +++ b/activesupport/lib/active_support/dependencies.rb @@ -1,8 +1,3 @@ -require 'set' -require 'active_support/core_ext/module/attribute_accessors' -require 'active_support/core_ext/load_error' -require 'active_support/core_ext/kernel' - module ActiveSupport #:nodoc: module Dependencies #:nodoc: extend self @@ -52,6 +47,119 @@ module ActiveSupport #:nodoc: mattr_accessor :constant_watch_stack self.constant_watch_stack = [] + # Module includes this module + module ModuleConstMissing #:nodoc: + def self.included(base) #:nodoc: + base.class_eval do + # Rename the original handler so we can chain it to the new one + alias_method :rails_original_const_missing, :const_missing + + # Use const_missing to autoload associations so we don't have to + # require_association when using single-table inheritance. + def const_missing(class_id) + ActiveSupport::Dependencies.load_missing_constant self, class_id + end + end + end + + def unloadable(const_desc = self) + super(const_desc) + end + end + + # Class includes this module + module ClassConstMissing #:nodoc: + def const_missing(const_name) + if [Object, Kernel].include?(self) || parent == self + super + else + begin + begin + Dependencies.load_missing_constant self, const_name + rescue NameError + parent.send :const_missing, const_name + end + rescue NameError => e + # Make sure that the name we are missing is the one that caused the error + parent_qualified_name = Dependencies.qualified_name_for parent, const_name + raise unless e.missing_name? parent_qualified_name + qualified_name = Dependencies.qualified_name_for self, const_name + raise NameError.new("uninitialized constant #{qualified_name}").copy_blame!(e) + end + end + end + end + + # Object includes this module + module Loadable #:nodoc: + def load(file, *extras) #:nodoc: + Dependencies.new_constants_in(Object) { super } + rescue Exception => exception # errors from loading file + exception.blame_file! file + raise + end + + def require(file, *extras) #:nodoc: + Dependencies.new_constants_in(Object) { super } + rescue Exception => exception # errors from required file + exception.blame_file! file + raise + end + + # Mark the given constant as unloadable. Unloadable constants are removed each + # time dependencies are cleared. + # + # Note that marking a constant for unloading need only be done once. Setup + # or init scripts may list each unloadable constant that may need unloading; + # each constant will be removed for every subsequent clear, as opposed to for + # the first clear. + # + # The provided constant descriptor may be a (non-anonymous) module or class, + # or a qualified constant name as a string or symbol. + # + # Returns true if the constant was not previously marked for unloading, false + # otherwise. + def unloadable(const_desc) + Dependencies.mark_for_unload const_desc + end + end + + # Exception file-blaming + module Blamable #:nodoc: + def blame_file!(file) + (@blamed_files ||= []).unshift file + end + + def blamed_files + @blamed_files ||= [] + end + + def describe_blame + return nil if blamed_files.empty? + "This error occurred while loading the following files:\n #{blamed_files.join "\n "}" + end + + def copy_blame!(exc) + @blamed_files = exc.blamed_files.clone + self + end + end + + def inject! + Object.instance_eval do + define_method(:require_or_load) { |file_name| Dependencies.require_or_load(file_name) } unless Object.respond_to?(:require_or_load) + define_method(:require_dependency) { |file_name| Dependencies.depend_on(file_name) } unless Object.respond_to?(:require_dependency) + define_method(:require_association) { |file_name| Dependencies.associate_with(file_name) } unless Object.respond_to?(:require_association) + + alias_method :load_without_new_constant_marking, :load + include Loadable + end + + Module.instance_eval { include ModuleConstMissing } + Class.instance_eval { include ClassConstMissing } + Exception.instance_eval { include Blamable } + end + def load? mechanism == :load end @@ -452,102 +560,4 @@ module ActiveSupport #:nodoc: end end -Object.instance_eval do - define_method(:require_or_load) { |file_name| ActiveSupport::Dependencies.require_or_load(file_name) } unless Object.respond_to?(:require_or_load) - define_method(:require_dependency) { |file_name| ActiveSupport::Dependencies.depend_on(file_name) } unless Object.respond_to?(:require_dependency) - define_method(:require_association) { |file_name| ActiveSupport::Dependencies.associate_with(file_name) } unless Object.respond_to?(:require_association) -end - -class Module #:nodoc: - # Rename the original handler so we can chain it to the new one - alias :rails_original_const_missing :const_missing - - # Use const_missing to autoload associations so we don't have to - # require_association when using single-table inheritance. - def const_missing(class_id) - ActiveSupport::Dependencies.load_missing_constant self, class_id - end - - def unloadable(const_desc = self) - super(const_desc) - end - -end - -class Class - def const_missing(const_name) - if [Object, Kernel].include?(self) || parent == self - super - else - begin - begin - ActiveSupport::Dependencies.load_missing_constant self, const_name - rescue NameError - parent.send :const_missing, const_name - end - rescue NameError => e - # Make sure that the name we are missing is the one that caused the error - parent_qualified_name = ActiveSupport::Dependencies.qualified_name_for parent, const_name - raise unless e.missing_name? parent_qualified_name - qualified_name = ActiveSupport::Dependencies.qualified_name_for self, const_name - raise NameError.new("uninitialized constant #{qualified_name}").copy_blame!(e) - end - end - end -end - -class Object - alias_method :load_without_new_constant_marking, :load - - def load(file, *extras) #:nodoc: - ActiveSupport::Dependencies.new_constants_in(Object) { super } - rescue Exception => exception # errors from loading file - exception.blame_file! file - raise - end - - def require(file, *extras) #:nodoc: - ActiveSupport::Dependencies.new_constants_in(Object) { super } - rescue Exception => exception # errors from required file - exception.blame_file! file - raise - end - - # Mark the given constant as unloadable. Unloadable constants are removed each - # time dependencies are cleared. - # - # Note that marking a constant for unloading need only be done once. Setup - # or init scripts may list each unloadable constant that may need unloading; - # each constant will be removed for every subsequent clear, as opposed to for - # the first clear. - # - # The provided constant descriptor may be a (non-anonymous) module or class, - # or a qualified constant name as a string or symbol. - # - # Returns true if the constant was not previously marked for unloading, false - # otherwise. - def unloadable(const_desc) - ActiveSupport::Dependencies.mark_for_unload const_desc - end -end - -# Add file-blaming to exceptions -class Exception #:nodoc: - def blame_file!(file) - (@blamed_files ||= []).unshift file - end - - def blamed_files - @blamed_files ||= [] - end - - def describe_blame - return nil if blamed_files.empty? - "This error occurred while loading the following files:\n #{blamed_files.join "\n "}" - end - - def copy_blame!(exc) - @blamed_files = exc.blamed_files.clone - self - end -end +ActiveSupport::Dependencies.inject! -- cgit v1.2.3