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Contents
module Sprockets
module Utils
class Gzip
# Private: Generates a gzipped file based off of reference file.
def initialize(asset)
@content_type = asset.content_type
@source = asset.source
@charset = asset.charset
end
# Private: Returns whether or not an asset can be compressed.
#
# We want to compress any file that is text based.
# You do not want to compress binary
# files as they may already be compressed and running them
# through a compression algorithm would make them larger.
#
# Return Boolean.
def can_compress?(mime_types)
# The "charset" of a mime type is present if the value is
# encoded text. We can check this value to see if the asset
# can be compressed.
#
# SVG images are text but do not have
# a charset defined, this is special cased.
@charset || @content_type == "image/svg+xml".freeze
end
# Private: Opposite of `can_compress?`.
#
# Returns Boolean.
def cannot_compress?(mime_types)
!can_compress?(mime_types)
end
# Private: Generates a gzipped file based off of reference asset.
#
# Compresses the target asset's contents and puts it into a file with
# the same name plus a `.gz` extension in the same folder as the original.
# Does not modify the target asset.
#
# Returns nothing.
def compress(target)
mtime = PathUtils.stat(target).mtime
PathUtils.atomic_write("#{target}.gz") do |f|
gz = Zlib::GzipWriter.new(f, Zlib::BEST_COMPRESSION)
gz.mtime = mtime
gz.write(@source)
gz.close
File.utime(mtime, mtime, f.path)
end
nil
end
end
end
end
Version data entries
6 entries across 3 versions & 2 rubygems