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module Sprockets
module Compressors
extend self
@@css_compressors = {}
@@js_compressors = {}
@@default_css_compressor = nil
@@default_js_compressor = nil
def register_css_compressor(name, klass, options = {})
@@default_css_compressor = name.to_sym if options[:default] || @@default_css_compressor.nil?
@@css_compressors[name.to_sym] = { :klass => klass.to_s, :require => options[:require] }
end
def register_js_compressor(name, klass, options = {})
@@default_js_compressor = name.to_sym if options[:default] || @@default_js_compressor.nil?
@@js_compressors[name.to_sym] = { :klass => klass.to_s, :require => options[:require] }
end
def registered_css_compressor(name)
find_registered_compressor name, @@css_compressors, @@default_css_compressor
end
def registered_js_compressor(name)
find_registered_compressor name, @@js_compressors, @@default_js_compressor
end
# The default compressors must be registered in default plugins (ex. Sass-Rails)
register_css_compressor(:scss, 'Sass::Rails::Compressor', :require => 'sass/rails/compressor', :default => true)
register_js_compressor(:uglifier, 'Uglifier', :require => 'uglifier', :default => true)
# Automaticaly register some compressors
register_css_compressor(:yui, 'YUI::CssCompressor', :require => 'yui/compressor')
register_js_compressor(:closure, 'Closure::Compiler', :require => 'closure-compiler')
register_js_compressor(:yui, 'YUI::JavaScriptCompressor', :require => 'yui/compressor')
private
def find_registered_compressor(name, compressors_hash, default_compressor_name)
if name.respond_to?(:to_sym)
compressor = compressors_hash[name.to_sym] || compressors_hash[default_compressor_name]
require compressor[:require] if compressor[:require]
compressor[:klass].constantize.new
else
name
end
end
end
# An asset compressor which does nothing.
#
# This compressor simply returns the asset as-is, without any compression
# whatsoever. It is useful in development mode, when compression isn't
# needed but using the same asset pipeline as production is desired.
class NullCompressor #:nodoc:
def compress(content)
content
end
end
# An asset compressor which only initializes the underlying compression
# engine when needed.
#
# This postpones the initialization of the compressor until
# <code>#compress</code> is called the first time.
class LazyCompressor #:nodoc:
# Initializes a new LazyCompressor.
#
# The block should return a compressor when called, i.e. an object
# which responds to <code>#compress</code>.
def initialize(&block)
@block = block
end
def compress(content)
compressor.compress(content)
end
private
def compressor
@compressor ||= (@block.call || NullCompressor.new)
end
end
end
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