Module: Sprockets::Compressing

Includes:
Utils
Included in:
Configuration
Defined in:
lib/sprockets/compressing.rb

Overview

‘Compressing` is an internal mixin whose public methods are exposed on the `Environment` and `CachedEnvironment` classes.

Instance Method Summary collapse

Methods included from Utils

#concat_javascript_sources, #dfs, #dfs_paths, #duplicable?, #hash_reassoc, #hash_reassoc1, #module_include, #string_end_with_semicolon?

Instance Method Details

#compressors ⇒ Object 



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# File 'lib/sprockets/compressing.rb', line 10

def compressors
  config[:compressors]
end

#css_compressor ⇒ Object

Return CSS compressor or nil if none is set



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# File 'lib/sprockets/compressing.rb', line 40

def css_compressor
  if defined? @css_compressor
    @css_compressor
  end
end

#css_compressor=(compressor) ⇒ Object

Assign a compressor to run on ‘text/css` assets.

The compressor object must respond to ‘compress`.



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# File 'lib/sprockets/compressing.rb', line 49

def css_compressor=(compressor)
  unregister_bundle_processor 'text/css', @css_compressor if defined? @css_compressor
  @css_compressor = nil
  return unless compressor

  if compressor.is_a?(Symbol)
    @css_compressor = klass = config[:compressors]['text/css'][compressor] || raise(Error, "unknown compressor: #{compressor}")
  elsif compressor.respond_to?(:compress)
    klass = proc { |input| compressor.compress(input[:data]) }
    @css_compressor = :css_compressor
  else
    @css_compressor = klass = compressor
  end

  register_bundle_processor 'text/css', klass
end

#gzip=(gzip) ⇒ Object

Public: Enable or disable the creation of Gzip files.

To disable gzip generation set to a falsey value:

environment.gzip = false

To enable set to a truthy value. By default zlib wil be used to gzip assets. If you have the Zopfli gem installed you can specify the zopfli algorithm to be used instead:

environment.gzip = :zopfli



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# File 'lib/sprockets/compressing.rb', line 116

def gzip=(gzip)
  self.config = config.merge(gzip_enabled: gzip).freeze

  case gzip
  when false, nil
    self.unregister_exporter Exporters::ZlibExporter
    self.unregister_exporter Exporters::ZopfliExporter
  when :zopfli
    self.unregister_exporter Exporters::ZlibExporter
    self.register_exporter '*/*', Exporters::ZopfliExporter
  else
    self.unregister_exporter Exporters::ZopfliExporter
    self.register_exporter '*/*', Exporters::ZlibExporter
  end

  gzip
end

#gzip? ⇒ Boolean

Public: Checks if Gzip is enabled.

Returns:

  • (Boolean) 


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# File 'lib/sprockets/compressing.rb', line 94

def gzip?
  config[:gzip_enabled]
end

#js_compressor ⇒ Object

Return JS compressor or nil if none is set



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# File 'lib/sprockets/compressing.rb', line 67

def js_compressor
  if defined? @js_compressor
    @js_compressor
  end
end

#js_compressor=(compressor) ⇒ Object

Assign a compressor to run on ‘application/javascript` assets.

The compressor object must respond to ‘compress`.



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# File 'lib/sprockets/compressing.rb', line 76

def js_compressor=(compressor)
  unregister_bundle_processor 'application/javascript', @js_compressor if defined? @js_compressor
  @js_compressor = nil
  return unless compressor

  if compressor.is_a?(Symbol)
    @js_compressor = klass = config[:compressors]['application/javascript'][compressor] || raise(Error, "unknown compressor: #{compressor}")
  elsif compressor.respond_to?(:compress)
    klass = proc { |input| compressor.compress(input[:data]) }
    @js_compressor = :js_compressor
  else
    @js_compressor = klass = compressor
  end

  register_bundle_processor 'application/javascript', klass
end

#register_compressor(mime_type, sym, klass) ⇒ Object

Public: Register a new compressor ‘klass` at `sym` for `mime_type`.

Registering a processor allows it to be looked up by ‘sym` later when assigning a JavaScript or CSS compressor.

Compressors only operate on JavaScript and CSS. If you want to compress a different type of asset, use a processor instead.

Examples

register_compressor 'text/css', :my_sass, MySassCompressor
css_compressor = :my_sass

mime_type - String MIME Type (one of: ‘test/css’ or ‘application/javascript’). sym - Symbol registration address. klass - The compressor class.

Returns nothing.



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# File 'lib/sprockets/compressing.rb', line 32

def register_compressor(mime_type, sym, klass)
  self.config = hash_reassoc(config, :compressors, mime_type) do |compressors|
    compressors[sym] = klass
    compressors
  end
end

#skip_gzip? ⇒ Boolean

Public: Checks if Gzip is disabled.

Returns:

  • (Boolean) 


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# File 'lib/sprockets/compressing.rb', line 99

def skip_gzip?
  !gzip?
end