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Diffstat (limited to 'actionpack/lib/action_view/digestor.rb')
-rw-r--r-- | actionpack/lib/action_view/digestor.rb | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/actionpack/lib/action_view/digestor.rb b/actionpack/lib/action_view/digestor.rb new file mode 100644 index 0000000000..899100d06c --- /dev/null +++ b/actionpack/lib/action_view/digestor.rb @@ -0,0 +1,104 @@ +require 'active_support/core_ext' +require 'logger' + +module ActionView + class Digestor + EXPLICIT_DEPENDENCY = /# Template Dependency: ([^ ]+)/ + + # 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_accessor(:cache) { Hash.new } + cattr_accessor(:logger, instance_reader: true) { ActionView::Base.logger } + + def self.digest(name, format, finder, options = {}) + cache["#{name}.#{format}"] ||= new(name, format, finder, options).digest + 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("#{name}.#{format}-#{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 = Digestor.new(dependency, format, finder, partial: true).nested_dependencies + dependencies.any? ? { dependency => dependencies } : dependency + end + end + + + private + def logical_name + name.gsub(%r|/_|, "/") + end + + def directory + name.split("/").first + end + + def partial? + options[:partial] || name.include?("/_") + end + + def source + @source ||= finder.find(logical_name, [], partial?, formats: [ format ]).source + end + + + def dependency_digest + dependencies.collect do |template_name| + Digestor.digest(template_name, format, finder, partial: true) + end.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 + end +end
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