freeze rails 2.2

vendor/rails/actionpack/lib/action_view/renderable.rb

@@ -0,0 +1,102 @@
+module ActionView
+  # NOTE: The template that this mixin is being included into is frozen
+  # so you cannot set or modify any instance variables
+  module Renderable #:nodoc:
+    extend ActiveSupport::Memoizable
+
+    def self.included(base)
+      @@mutex = Mutex.new
+    end
+
+    def filename
+      'compiled-template'
+    end
+
+    def handler
+      Template.handler_class_for_extension(extension)
+    end
+    memoize :handler
+
+    def compiled_source
+      handler.call(self)
+    end
+    memoize :compiled_source
+
+    def render(view, local_assigns = {})
+      compile(local_assigns)
+
+      stack = view.instance_variable_get(:@_render_stack)
+      stack.push(self)
+
+      # This is only used for TestResponse to set rendered_template
+      unless is_a?(InlineTemplate) || view.instance_variable_get(:@_first_render)
+        view.instance_variable_set(:@_first_render, self)
+      end
+
+      view.send(:_evaluate_assigns_and_ivars)
+      view.send(:_set_controller_content_type, mime_type) if respond_to?(:mime_type)
+
+      result = view.send(method_name(local_assigns), local_assigns) do |*names|
+        ivar = :@_proc_for_layout
+        if !view.instance_variable_defined?(:"@content_for_#{names.first}") && view.instance_variable_defined?(ivar) && (proc = view.instance_variable_get(ivar))
+          view.capture(*names, &proc)
+        elsif view.instance_variable_defined?(ivar = :"@content_for_#{names.first || :layout}")
+          view.instance_variable_get(ivar)
+        end
+      end
+
+      stack.pop
+      result
+    end
+
+    def method_name(local_assigns)
+      if local_assigns && local_assigns.any?
+        local_assigns_keys = "locals_#{local_assigns.keys.map { |k| k.to_s }.sort.join('_')}"
+      end
+      ['_run', extension, method_segment, local_assigns_keys].compact.join('_').to_sym
+    end
+
+    private
+      # Compile and evaluate the template's code (if necessary)
+      def compile(local_assigns)
+        render_symbol = method_name(local_assigns)
+
+        @@mutex.synchronize do
+          if recompile?(render_symbol)
+            compile!(render_symbol, local_assigns)
+          end
+        end
+      end
+
+      def compile!(render_symbol, local_assigns)
+        locals_code = local_assigns.keys.map { |key| "#{key} = local_assigns[:#{key}];" }.join
+
+        source = <<-end_src
+          def #{render_symbol}(local_assigns)
+            old_output_buffer = output_buffer;#{locals_code};#{compiled_source}
+          ensure
+            self.output_buffer = old_output_buffer
+          end
+        end_src
+
+        begin
+          ActionView::Base::CompiledTemplates.module_eval(source, filename, 0)
+        rescue Exception => e # errors from template code
+          if logger = defined?(ActionController) && Base.logger
+            logger.debug "ERROR: compiling #{render_symbol} RAISED #{e}"
+            logger.debug "Function body: #{source}"
+            logger.debug "Backtrace: #{e.backtrace.join("\n")}"
+          end
+
+          raise ActionView::TemplateError.new(self, {}, e)
+        end
+      end
+
+      # Method to check whether template compilation is necessary.
+      # The template will be compiled if the file has not been compiled yet, or
+      # if local_assigns has a new key, which isn't supported by the compiled code yet.
+      def recompile?(symbol)
+        !(ActionView::PathSet::Path.eager_load_templates? && Base::CompiledTemplates.method_defined?(symbol))
+      end
+  end
+end