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module Sprockets
# 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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