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module ActionView
module TemplateHandlers
module Compilable
def self.included(base)
base.extend ClassMethod
@@mutex = Mutex.new
end
module ClassMethod
# If a handler is mixin this module, set compilable to true
def compilable?
true
end
end
def render(template, local_assigns = {})
@view.send(:execute, template, local_assigns)
end
# Compile and evaluate the template's code
def compile_template(template)
return false unless recompile_template?(template)
@@mutex.synchronize do
locals_code = template.locals.keys.map { |key| "#{key} = local_assigns[:#{key}];" }.join
source = <<-end_src
def #{template.method}(local_assigns)
old_output_buffer = output_buffer;#{locals_code};#{compile(template)}
ensure
self.output_buffer = old_output_buffer
end
end_src
begin
file_name = template.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 #{template.method} RAISED #{e}"
logger.debug "Function body: #{source}"
logger.debug "Backtrace: #{e.backtrace.join("\n")}"
end
raise ActionView::TemplateError.new(template, @view.assigns, e)
end
end
end
private
# Method to check whether template compilation is necessary.
# The template will be compiled if the inline template or file has not been compiled yet,
# if local_assigns has a new key, which isn't supported by the compiled code yet.
def recompile_template?(template)
# Unless the template has been complied yet, compile
return true unless Base::CompiledTemplates.instance_methods.include?(template.method.to_s)
# If template caching is disabled, compile
return true unless Base.cache_template_loading
# Always recompile inline templates
return true if template.is_a?(InlineTemplate)
# Otherwise, use compiled method
return false
end
end
end
end
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