diff options
Diffstat (limited to 'activesupport/lib/active_support/dependencies.rb')
| -rw-r--r-- | activesupport/lib/active_support/dependencies.rb | 129 |
1 files changed, 66 insertions, 63 deletions
diff --git a/activesupport/lib/active_support/dependencies.rb b/activesupport/lib/active_support/dependencies.rb index 3f6c93e860..66f3af7002 100644 --- a/activesupport/lib/active_support/dependencies.rb +++ b/activesupport/lib/active_support/dependencies.rb @@ -5,6 +5,7 @@ require 'active_support/core_ext/module/aliasing' require 'active_support/core_ext/module/attribute_accessors' require 'active_support/core_ext/module/introspection' require 'active_support/core_ext/module/anonymous' +require 'active_support/core_ext/module/qualified_const' require 'active_support/core_ext/object/blank' require 'active_support/core_ext/load_error' require 'active_support/core_ext/name_error' @@ -70,14 +71,24 @@ module ActiveSupport #:nodoc: # # This is handled by walking back up the watch stack and adding the constants # found by child.rb to the list of original constants in parent.rb - class WatchStack < Hash + class WatchStack + include Enumerable + # @watching is a stack of lists of constants being watched. For instance, # if parent.rb is autoloaded, the stack will look like [[Object]]. If parent.rb # then requires namespace/child.rb, the stack will look like [[Object], [Namespace]]. def initialize @watching = [] - super { |h,k| h[k] = [] } + @stack = Hash.new { |h,k| h[k] = [] } + end + + def each(&block) + @stack.each(&block) + end + + def watching? + !@watching.empty? end # return a list of new constants found since the last call to watch_namespaces @@ -88,20 +99,20 @@ module ActiveSupport #:nodoc: @watching.last.each do |namespace| # Retrieve the constants that were present under the namespace when watch_namespaces # was originally called - original_constants = self[namespace].last + original_constants = @stack[namespace].last mod = Inflector.constantize(namespace) if Dependencies.qualified_const_defined?(namespace) next unless mod.is_a?(Module) # Get a list of the constants that were added - new_constants = mod.local_constant_names - original_constants + new_constants = mod.local_constants - original_constants # self[namespace] returns an Array of the constants that are being evaluated # for that namespace. For instance, if parent.rb requires child.rb, the first # element of self[Object] will be an Array of the constants that were present # before parent.rb was required. The second element will be an Array of the # constants that were present before child.rb was required. - self[namespace].each do |namespace_constants| + @stack[namespace].each do |namespace_constants| namespace_constants.concat(new_constants) end @@ -118,20 +129,19 @@ module ActiveSupport #:nodoc: # Add a set of modules to the watch stack, remembering the initial constants def watch_namespaces(namespaces) - watching = [] - namespaces.map do |namespace| + @watching << namespaces.map do |namespace| module_name = Dependencies.to_constant_name(namespace) original_constants = Dependencies.qualified_const_defined?(module_name) ? - Inflector.constantize(module_name).local_constant_names : [] + Inflector.constantize(module_name).local_constants : [] - watching << module_name - self[module_name] << original_constants + @stack[module_name] << original_constants + module_name end - @watching << watching end + private def pop_modules(modules) - modules.each { |mod| self[mod].pop } + modules.each { |mod| @stack[mod].pop } end end @@ -218,8 +228,8 @@ module ActiveSupport #:nodoc: end def load_dependency(file) - if Dependencies.load? - Dependencies.new_constants_in(Object) { yield }.presence + if Dependencies.load? && ActiveSupport::Dependencies.constant_watch_stack.watching? + Dependencies.new_constants_in(Object) { yield } else yield end @@ -228,12 +238,16 @@ module ActiveSupport #:nodoc: raise end - def load(file, *) - load_dependency(file) { super } + def load(file, wrap = false) + result = false + load_dependency(file) { result = super } + result end - def require(file, *) - load_dependency(file) { super } + def require(file) + result = false + load_dependency(file) { result = super } + result end # Mark the given constant as unloadable. Unloadable constants are removed each @@ -349,29 +363,12 @@ module ActiveSupport #:nodoc: # Record history *after* loading so first load gets warnings. history << expanded - return result + result end # Is the provided constant path defined? def qualified_const_defined?(path) - names = path.sub(/^::/, '').to_s.split('::') - - names.inject(Object) do |mod, name| - return false unless local_const_defined?(mod, name) - mod.const_get name - end - end - - if Module.method(:const_defined?).arity == 1 - # Does this module define this constant? - # Wrapper to accommodate changing Module#const_defined? in Ruby 1.9 - def local_const_defined?(mod, const) - mod.const_defined?(const) - end - else - def local_const_defined?(mod, const) #:nodoc: - mod.const_defined?(const, false) - end + Object.qualified_const_defined?(path.sub(/^::/, ''), false) end # Given +path+, a filesystem path to a ruby file, return an array of constant @@ -417,11 +414,12 @@ module ActiveSupport #:nodoc: end def load_once_path?(path) - autoload_once_paths.any? { |base| path.starts_with? base } + # to_s works around a ruby1.9 issue where #starts_with?(Pathname) will always return false + autoload_once_paths.any? { |base| path.starts_with? base.to_s } end # Attempt to autoload the provided module name by searching for a directory - # matching the expect path suffix. If found, the module is created and assigned + # matching the expected path suffix. If found, the module is created and assigned # to +into+'s constants with the name +const_name+. Provided that the directory # was loaded from a reloadable base path, it is added to the set of constants # that are to be unloaded. @@ -430,7 +428,7 @@ module ActiveSupport #:nodoc: mod = Module.new into.const_set const_name, mod autoloaded_constants << qualified_name unless autoload_once_paths.include?(base_path) - return mod + mod end # Load the file at the provided path. +const_paths+ is a set of qualified @@ -454,7 +452,7 @@ module ActiveSupport #:nodoc: autoloaded_constants.concat newly_defined_paths unless load_once_path?(path) autoloaded_constants.uniq! log "loading #{path} defined #{newly_defined_paths * ', '}" unless newly_defined_paths.empty? - return result + result end # Return the constant path for the provided parent and constant name. @@ -473,7 +471,7 @@ module ActiveSupport #:nodoc: raise ArgumentError, "A copy of #{from_mod} has been removed from the module tree but is still active!" end - raise NameError, "#{from_mod} is not missing constant #{const_name}!" if local_const_defined?(from_mod, const_name) + raise NameError, "#{from_mod} is not missing constant #{const_name}!" if from_mod.const_defined?(const_name, false) qualified_name = qualified_name_for from_mod, const_name path_suffix = qualified_name.underscore @@ -482,12 +480,12 @@ module ActiveSupport #:nodoc: if file_path && ! loaded.include?(File.expand_path(file_path)) # We found a matching file to load require_or_load file_path - raise LoadError, "Expected #{file_path} to define #{qualified_name}" unless local_const_defined?(from_mod, const_name) + raise LoadError, "Expected #{file_path} to define #{qualified_name}" unless from_mod.const_defined?(const_name, false) return from_mod.const_get(const_name) elsif mod = autoload_module!(from_mod, const_name, qualified_name, path_suffix) return mod elsif (parent = from_mod.parent) && parent != from_mod && - ! from_mod.parents.any? { |p| local_const_defined?(p, const_name) } + ! from_mod.parents.any? { |p| p.const_defined?(const_name, false) } # If our parents do not have a constant named +const_name+ then we are free # to attempt to load upwards. If they do have such a constant, then this # const_missing must be due to from_mod::const_name, which should not @@ -501,7 +499,7 @@ module ActiveSupport #:nodoc: raise NameError, "uninitialized constant #{qualified_name}", - caller.reject {|l| l.starts_with? __FILE__ } + caller.reject { |l| l.starts_with? __FILE__ } end # Remove the constants that have been autoloaded, and those that have been @@ -520,7 +518,7 @@ module ActiveSupport #:nodoc: class ClassCache def initialize - @store = Hash.new { |h, k| h[k] = Inflector.constantize(k) } + @store = Hash.new end def empty? @@ -531,23 +529,21 @@ module ActiveSupport #:nodoc: @store.key?(key) end - def []=(key, value) - return unless key.respond_to?(:name) - - raise(ArgumentError, 'anonymous classes cannot be cached') if key.name.blank? - - @store[key.name] = value + def get(key) + key = key.name if key.respond_to?(:name) + @store[key] ||= Inflector.constantize(key) end + alias :[] :get - def [](key) + def safe_get(key) key = key.name if key.respond_to?(:name) - - @store[key] + @store[key] ||= Inflector.safe_constantize(key) end - alias :get :[] - def store(name) - self[name] = name + def store(klass) + return self unless klass.respond_to?(:name) + raise(ArgumentError, 'anonymous classes cannot be cached') if klass.name.empty? + @store[klass.name] = klass self end @@ -564,10 +560,17 @@ module ActiveSupport #:nodoc: end # Get the reference for class named +name+. + # Raises an exception if referenced class does not exist. def constantize(name) Reference.get(name) end + # Get the reference for class named +name+ if one exists. + # Otherwise returns nil. + def safe_constantize(name) + Reference.safe_get(name) + end + # Determine if the given constant has been automatically loaded. def autoloaded?(desc) # No name => anonymous module. @@ -588,10 +591,10 @@ module ActiveSupport #:nodoc: def mark_for_unload(const_desc) name = to_constant_name const_desc if explicitly_unloadable_constants.include? name - return false + false else explicitly_unloadable_constants << name - return true + true end end @@ -619,10 +622,10 @@ module ActiveSupport #:nodoc: return new_constants unless aborting log "Error during loading, removing partially loaded constants " - new_constants.each {|c| remove_constant(c) }.clear + new_constants.each { |c| remove_constant(c) }.clear end - return [] + [] end # Convert the provided const desc to a qualified constant name (as a string). @@ -651,7 +654,7 @@ module ActiveSupport #:nodoc: constantized.before_remove_const if constantized.respond_to?(:before_remove_const) parent.instance_eval { remove_const to_remove } - return true + true end protected |