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