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require 'thread_safe'
module ActionView
class DependencyTracker
@trackers = ThreadSafe::Cache.new
def self.find_dependencies(name, template)
tracker = @trackers[template.handler]
if tracker.present?
tracker.call(name, template)
else
[]
end
end
def self.register_tracker(extension, tracker)
handler = Template.handler_for_extension(extension)
@trackers[handler] = tracker
end
def self.remove_tracker(handler)
@trackers.delete(handler)
end
class ERBTracker
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"'][@\w\/\."']+) # the template name itself -- 2nd capture
/x
def self.call(name, template)
new(name, template).dependencies
end
def initialize(name, template)
@name, @template = name, template
end
def dependencies
render_dependencies + explicit_dependencies
end
attr_reader :name, :template
private :name, :template
private
def source
template.source
end
def directory
name.split("/")[0..-2].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
register_tracker :erb, ERBTracker
end
end
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