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require 'thread_safe'
module ActionView
class Digestor
EXPLICIT_DEPENDENCY = /# Template Dependency: (\S+)/
# Matches:
# render partial: "comments/comment", collection: commentable.comments
# render "comments/comments"
# render 'comments/comments'
# render('comments/comments')
#
# render(@topic) => render("topics/topic")
# render(topics) => render("topics/topic")
# render(message.topics) => render("topics/topic")
RENDER_DEPENDENCY = /
render\s* # render, followed by optional whitespace
\(? # start an optional parenthesis for the render call
(partial:|:partial\s+=>)?\s* # naming the partial, used with collection -- 1st capture
([@a-z"'][@a-z_\/\."']+) # the template name itself -- 2nd capture
/x
cattr_reader(:cache)
@@cache = ThreadSafe::Cache.new
def self.digest(name, format, finder, options = {})
cache_key = [name, format] + Array.wrap(options[:dependencies])
@@cache[cache_key.join('.')] ||= begin
klass = options[:partial] || name.include?("/_") ? PartialDigestor : Digestor
klass.new(name, format, finder, options).digest
end
end
attr_reader :name, :format, :finder, :options
def initialize(name, format, finder, options={})
@name, @format, @finder, @options = name, format, finder, options
end
def digest
Digest::MD5.hexdigest("#{source}-#{dependency_digest}").tap do |digest|
logger.try :info, "Cache digest for #{name}.#{format}: #{digest}"
end
rescue ActionView::MissingTemplate
logger.try :error, "Couldn't find template for digesting: #{name}.#{format}"
''
end
def dependencies
render_dependencies + explicit_dependencies
rescue ActionView::MissingTemplate
[] # File doesn't exist, so no dependencies
end
def nested_dependencies
dependencies.collect do |dependency|
dependencies = PartialDigestor.new(dependency, format, finder).nested_dependencies
dependencies.any? ? { dependency => dependencies } : dependency
end
end
private
def logger
ActionView::Base.logger
end
def logical_name
name.gsub(%r|/_|, "/")
end
def directory
name.split("/")[0..-2].join("/")
end
def partial?
false
end
def source
@source ||= finder.find(logical_name, [], partial?, formats: [ format ]).source
end
def dependency_digest
template_digests = dependencies.collect do |template_name|
Digestor.digest(template_name, format, finder, partial: true)
end
(template_digests + injected_dependencies).join("-")
end
def render_dependencies
source.scan(RENDER_DEPENDENCY).
collect(&:second).uniq.
# render(@topic) => render("topics/topic")
# render(topics) => render("topics/topic")
# render(message.topics) => render("topics/topic")
collect { |name| name.sub(/\A@?([a-z]+\.)*([a-z_]+)\z/) { "#{$2.pluralize}/#{$2.singularize}" } }.
# render("headline") => render("message/headline")
collect { |name| name.include?("/") ? name : "#{directory}/#{name}" }.
# replace quotes from string renders
collect { |name| name.gsub(/["']/, "") }
end
def explicit_dependencies
source.scan(EXPLICIT_DEPENDENCY).flatten.uniq
end
def injected_dependencies
Array.wrap(options[:dependencies])
end
end
class PartialDigestor < Digestor # :nodoc:
def partial?
true
end
end
end
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