module ActionView module Renderable # NOTE: The template that this mixin is beening include into is frozen # So you can not set or modify any instance variables def self.included(base) @@mutex = Mutex.new end include ActiveSupport::Memoizable def filename 'compiled-template' end def handler Template.handler_class_for_extension(extension) end memoize :handler def compiled_source handler.new(nil).compile(self) if handler.compilable? end memoize :compiled_source def render(view, local_assigns = {}) view._first_render ||= self view._last_render = self view.send(:evaluate_assigns) compile(local_assigns) if handler.compilable? handler.new(view).render(self, local_assigns) end def method(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(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 logger = ActionController::Base.logger logger.debug "Compiling template #{render_symbol}" if logger ActionView::Base::CompiledTemplates.module_eval(source, filename, 0) rescue Exception => e # errors from template code if 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) !(frozen? && Base::CompiledTemplates.method_defined?(symbol)) end end end