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128 lines
3.8 KiB
Ruby
128 lines
3.8 KiB
Ruby
# encoding: utf-8
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# This is so that templates compiled in this file are UTF-8
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require 'active_support/core_ext/array/wrap'
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require 'active_support/core_ext/object/blank'
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module ActionView
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class Template
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extend ActiveSupport::Autoload
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eager_autoload do
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autoload :Error
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autoload :Handler
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autoload :Handlers
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autoload :Text
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end
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extend Template::Handlers
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attr_reader :source, :identifier, :handler, :virtual_path, :formats
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Finalizer = proc do |method_name|
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proc do
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ActionView::CompiledTemplates.module_eval do
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remove_possible_method method_name
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end
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end
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end
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def initialize(source, identifier, handler, details)
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@source = source
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@identifier = identifier
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@handler = handler
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@virtual_path = details[:virtual_path]
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@method_names = {}
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format = details[:format] || :html
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@formats = Array.wrap(format).map(&:to_sym)
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end
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def render(view, locals, &block)
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# Notice that we use a bang in this instrumentation because you don't want to
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# consume this in production. This is only slow if it's being listened to.
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ActiveSupport::Notifications.instrument("action_view.render_template!", :virtual_path => @virtual_path) do
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method_name = compile(locals, view)
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view.send(method_name, locals, &block)
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end
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rescue Exception => e
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if e.is_a?(Template::Error)
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e.sub_template_of(self)
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raise e
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else
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raise Template::Error.new(self, view.assigns, e)
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end
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end
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def mime_type
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@mime_type ||= Mime::Type.lookup_by_extension(@formats.first.to_s) if @formats.first
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end
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def variable_name
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@variable_name ||= @virtual_path[%r'_?(\w+)(\.\w+)*$', 1].to_sym
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end
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def counter_name
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@counter_name ||= "#{variable_name}_counter".to_sym
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end
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def inspect
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if defined?(Rails.root)
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identifier.sub("#{Rails.root}/", '')
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else
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identifier
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end
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end
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private
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def compile(locals, view)
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method_name = build_method_name(locals)
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return method_name if view.respond_to?(method_name)
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locals_code = locals.keys.map! { |key| "#{key} = local_assigns[:#{key}];" }.join
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code = @handler.call(self)
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if code.sub!(/\A(#.*coding.*)\n/, '')
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encoding_comment = $1
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elsif defined?(Encoding) && Encoding.respond_to?(:default_external)
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encoding_comment = "#coding:#{Encoding.default_external}"
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end
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source = <<-end_src
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def #{method_name}(local_assigns)
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_old_virtual_path, @_virtual_path = @_virtual_path, #{@virtual_path.inspect};_old_output_buffer = output_buffer;#{locals_code};#{code}
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ensure
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@_virtual_path, self.output_buffer = _old_virtual_path, _old_output_buffer
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end
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end_src
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if encoding_comment
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source = "#{encoding_comment}\n#{source}"
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line = -1
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else
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line = 0
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end
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begin
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ActionView::CompiledTemplates.module_eval(source, identifier, line)
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ObjectSpace.define_finalizer(self, Finalizer[method_name])
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method_name
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rescue Exception => e # errors from template code
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if logger = (view && view.logger)
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logger.debug "ERROR: compiling #{method_name} RAISED #{e}"
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logger.debug "Function body: #{source}"
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logger.debug "Backtrace: #{e.backtrace.join("\n")}"
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end
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raise ActionView::Template::Error.new(self, {}, e)
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end
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end
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def build_method_name(locals)
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# TODO: is locals.keys.hash reliably the same?
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@method_names[locals.keys.hash] ||=
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"_render_template_#{@identifier.hash}_#{__id__}_#{locals.keys.hash}".gsub('-', "_")
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end
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end
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end
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