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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)
!(frozen? && Base::CompiledTemplates.method_defined?(symbol))
end
end
end
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