class Sprockets::CharsetNormalizer

Some browsers have issues with stylesheets that contain multiple ‘@charset` definitions. The issue surfaces while using Sass since it inserts a `@charset` at the top of each file. Then Sprockets concatenates them together.

The ‘CharsetNormalizer` processor strips out multiple `@charset` definitions.

The current implementation is naive. It picks the first ‘@charset` it sees and strips the others. This works for most people because the other definitions are usually `UTF-8`. A more sophisticated approach would be to re-encode stylesheets with mixed encodings.

This behavior can be disabled with:

environment.unregister_bundle_processor 'text/css', Sprockets::CharsetNormalizer

Public Instance Methods

evaluate (context, locals, &block)

Source

# File lib/sprockets/charset_normalizer.rb, line 25
def evaluate(context, locals, &block)
  charset = nil

  # Find and strip out any `@charset` definitions
  filtered_data = data.gsub(/^@charset "([^"]+)";$/) {
    charset ||= $1; ""
  }

  if charset
    # If there was a charset, move it to the top
    "@charset \"#{charset}\";#{filtered_data}"
  else
    data
  end
end

prepare ()

Source

# File lib/sprockets/charset_normalizer.rb, line 22
def prepare
end