--- /dev/null
+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