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tag: v3.2.12
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require 'thread'
require 'active_support/core_ext/file'
require 'active_support/core_ext/module/attribute_accessors'
module ActionView
module Helpers
module AssetTagHelper
class AssetPaths < ::ActionView::AssetPaths #:nodoc:
# You can enable or disable the asset tag ids cache.
# With the cache enabled, the asset tag helper methods will make fewer
# expensive file system calls (the default implementation checks the file
# system timestamp). However this prevents you from modifying any asset
# files while the server is running.
#
# ActionView::Helpers::AssetTagHelper::AssetPaths.cache_asset_ids = false
mattr_accessor :cache_asset_ids
# Add or change an asset id in the asset id cache. This can be used
# for SASS on Heroku.
# :api: public
def add_to_asset_ids_cache(source, asset_id)
self.asset_ids_cache_guard.synchronize do
self.asset_ids_cache[source] = asset_id
end
end
private
def rewrite_extension(source, dir, ext)
source_ext = File.extname(source)
source_with_ext = if source_ext.empty?
"#{source}.#{ext}"
elsif ext != source_ext[1..-1]
with_ext = "#{source}.#{ext}"
with_ext if File.exist?(File.join(config.assets_dir, dir, with_ext))
end
source_with_ext || source
end
# Break out the asset path rewrite in case plugins wish to put the asset id
# someplace other than the query string.
def rewrite_asset_path(source, dir, options = nil)
source = "/#{dir}/#{source}" unless source[0] == ?/
path = config.asset_path
if path && path.respond_to?(:call)
return path.call(source)
elsif path && path.is_a?(String)
return path % [source]
end
asset_id = rails_asset_id(source)
if asset_id.empty?
source
else
"#{source}?#{asset_id}"
end
end
mattr_accessor :asset_ids_cache
self.asset_ids_cache = {}
mattr_accessor :asset_ids_cache_guard
self.asset_ids_cache_guard = Mutex.new
# Use the RAILS_ASSET_ID environment variable or the source's
# modification time as its cache-busting asset id.
def rails_asset_id(source)
if asset_id = ENV["RAILS_ASSET_ID"]
asset_id
else
if self.cache_asset_ids && (asset_id = self.asset_ids_cache[source])
asset_id
else
path = File.join(config.assets_dir, source)
asset_id = File.exist?(path) ? File.mtime(path).to_i.to_s : ''
if self.cache_asset_ids
add_to_asset_ids_cache(source, asset_id)
end
asset_id
end
end
end
end
end
end
end
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