2012-12-13 08:47:33 -05:00
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require 'thread_safe'
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2012-10-17 18:20:51 -04:00
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2012-08-29 15:23:15 -04:00
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module ActionView
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class Digestor
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2012-12-21 16:51:41 -05:00
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EXPLICIT_DEPENDENCY = /# Template Dependency: (\S+)/
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# Matches:
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# render partial: "comments/comment", collection: commentable.comments
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# render "comments/comments"
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# render 'comments/comments'
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# render('comments/comments')
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#
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# render(@topic) => render("topics/topic")
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# render(topics) => render("topics/topic")
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# render(message.topics) => render("topics/topic")
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RENDER_DEPENDENCY = /
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2012-08-30 08:17:03 -04:00
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render\s* # render, followed by optional whitespace
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\(? # start an optional parenthesis for the render call
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(partial:|:partial\s+=>)?\s* # naming the partial, used with collection -- 1st capture
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([@a-z"'][@a-z_\/\."']+) # the template name itself -- 2nd capture
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2012-08-29 15:23:15 -04:00
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/x
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2012-09-05 13:38:16 -04:00
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cattr_reader(:cache)
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2012-12-13 08:47:33 -05:00
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@@cache = ThreadSafe::Cache.new
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2012-08-29 15:23:15 -04:00
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def self.digest(name, format, finder, options = {})
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cache_key = [name, format] + Array.wrap(options[:dependencies])
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@@cache[cache_key.join('.')] ||= begin
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klass = options[:partial] || name.include?("/_") ? PartialDigestor : Digestor
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klass.new(name, format, finder, options).digest
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end
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end
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attr_reader :name, :format, :finder, :options
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def initialize(name, format, finder, options={})
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@name, @format, @finder, @options = name, format, finder, options
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end
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def digest
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2012-09-04 18:29:00 -04:00
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Digest::MD5.hexdigest("#{source}-#{dependency_digest}").tap do |digest|
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logger.try :info, "Cache digest for #{name}.#{format}: #{digest}"
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end
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rescue ActionView::MissingTemplate
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logger.try :error, "Couldn't find template for digesting: #{name}.#{format}"
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''
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end
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def dependencies
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render_dependencies + explicit_dependencies
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rescue ActionView::MissingTemplate
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[] # File doesn't exist, so no dependencies
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end
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def nested_dependencies
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dependencies.collect do |dependency|
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dependencies = PartialDigestor.new(dependency, format, finder).nested_dependencies
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dependencies.any? ? { dependency => dependencies } : dependency
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end
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end
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private
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def logger
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ActionView::Base.logger
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end
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2012-08-29 15:23:15 -04:00
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def logical_name
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name.gsub(%r|/_|, "/")
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end
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2012-09-05 10:05:50 -04:00
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def directory
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2012-10-11 12:36:58 -04:00
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name.split("/")[0..-2].join("/")
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end
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def partial?
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false
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end
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def source
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@source ||= finder.find(logical_name, [], partial?, formats: [ format ]).source
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end
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def dependency_digest
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template_digests = dependencies.collect do |template_name|
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Digestor.digest(template_name, format, finder, partial: true)
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end
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(template_digests + injected_dependencies).join("-")
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2012-08-29 15:23:15 -04:00
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end
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def render_dependencies
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source.scan(RENDER_DEPENDENCY).
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collect(&:second).uniq.
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# render(@topic) => render("topics/topic")
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# render(topics) => render("topics/topic")
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# render(message.topics) => render("topics/topic")
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collect { |name| name.sub(/\A@?([a-z]+\.)*([a-z_]+)\z/) { "#{$2.pluralize}/#{$2.singularize}" } }.
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# render("headline") => render("message/headline")
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collect { |name| name.include?("/") ? name : "#{directory}/#{name}" }.
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2012-09-05 10:05:50 -04:00
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2012-08-29 15:23:15 -04:00
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# replace quotes from string renders
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collect { |name| name.gsub(/["']/, "") }
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end
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def explicit_dependencies
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source.scan(EXPLICIT_DEPENDENCY).flatten.uniq
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end
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2013-01-08 13:20:47 -05:00
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def injected_dependencies
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Array.wrap(options[:dependencies])
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end
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2012-08-29 15:23:15 -04:00
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end
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2012-10-17 18:20:51 -04:00
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class PartialDigestor < Digestor # :nodoc:
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def partial?
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true
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end
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end
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2012-09-05 10:05:50 -04:00
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end
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