Method: YUI::Compressor#compress

Defined in:
lib/yui/compressor.rb

#compress(stream_or_string) ⇒ Object

Compress a stream or string of code with YUI Compressor. (A stream is any object that responds to read and close like an IO.) If a block is given, you can read the compressed code from the block’s argument. Otherwise, compress returns a string of compressed code.

Example: Compress CSS

compressor = YUI::CssCompressor.new
compressor.compress("  div.error {\n    color: red;\n  }\n  div.warning {\n    display: none;\n  }\n")
# => "div.error{color:red;}div.warning{display:none;}"

Example: Compress JavaScript

compressor = YUI::JavaScriptCompressor.new
compressor.compress('(function () { var foo = {}; foo["bar"] = "baz"; })()')
# => "(function(){var foo={};foo.bar=\"baz\"})();"

Example: Compress and gzip a file on disk

File.open("my.js", "r") do |source|
  Zlib::GzipWriter.open("my.js.gz", "w") do |gzip|
    compressor.compress(source) do |compressed|
      while buffer = compressed.read(4096)
        gzip.write(buffer)
      end
    end
  end
end



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# File 'lib/yui/compressor.rb', line 85

def compress(stream_or_string)
  streamify(stream_or_string) do |stream|
    tempfile = Tempfile.new('yui_compress')
    tempfile.write stream.read
    tempfile.flush
    full_command = "%s %s" % [command, tempfile.path]

    begin
      output = `#{full_command}`
    rescue Exception => e
      # windows shells tend to blow up here when the command fails
      raise RuntimeError, "compression failed: %s" % e.message
    ensure
      tempfile.close!
    end

    if $?.exitstatus.zero?
      output
    else
      # Bourne shells tend to blow up here when the command fails, usually
      # because java is missing
      raise RuntimeError, "Command '%s' returned non-zero exit status" %
        full_command
    end
  end
end