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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 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
def compile(local_assigns)
render_symbol = method(local_assigns)
@@mutex.synchronize do
return false unless recompile?(render_symbol)
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
file_name = respond_to?(:filename) ? filename : 'compiled-template'
ActionView::Base::CompiledTemplates.module_eval(source, file_name, 0)
rescue Exception => e # errors from template code
if logger = 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
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)
meth = Base::CompiledTemplates.instance_method(template.method) rescue nil
!(meth && Base.cache_template_loading)
end
end
end
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