Class: WebResourceBundler::Filters::ImageEncodeFilter::CssGenerator

Inherits:
Object
  • Object
show all
Defined in:
lib/web_resource_bundler/filters/image_encode_filter/css_generator.rb

Constant Summary collapse

TAGS = 
%w(background-image background)
SEPARATOR = 
'A_SEPARATOR'
PATTERN = 
/((#{TAGS.join('|')})\s*:[^\(]*)url\(\s*['|"]([^\)]*)['|"]\s*\)/i
MAX_IMAGE_SIZE =

IE 8 limitation

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MHTML_CONTENT_TYPE = 
'Content-Type: multipart/related; boundary="'

Instance Method Summary collapse

Constructor Details

#initialize(settings, file_manager) ⇒ CssGenerator

Returns a new instance of CssGenerator.



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# File 'lib/web_resource_bundler/filters/image_encode_filter/css_generator.rb', line 12

def initialize(settings, file_manager)
  @settings     = settings
  @file_manager = file_manager 
end

Instance Method Details

#construct_mhtml_content(images) ⇒ Object

construct mhtml head of css file with definition of image data in base64 each image found in css should be defined in header with base64 encoded content



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# File 'lib/web_resource_bundler/filters/image_encode_filter/css_generator.rb', line 23

def construct_mhtml_content(images)
  result = ""
  if images.any?
    result << mhtml_header
    result << mhtml_images_data(images)
    result << mhtml_footer 
  end
  result
end

#encode_images!(content) ⇒ Object

generates css file with encoded images in cache dir



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# File 'lib/web_resource_bundler/filters/image_encode_filter/css_generator.rb', line 43

def encode_images!(content)
  encode_images_basic!(content) do |image_data, tag|
    "#{tag}url('data:image/#{image_data.extension};base64,#{image_data.encoded}')"
  end
end

#encode_images_for_ie!(content, path) ⇒ Object

generates css file for IE with encoded images using mhtml in cache dir mhtml_filepath - path to file with images encoded in base64 creating new css content with images encoded in base64



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# File 'lib/web_resource_bundler/filters/image_encode_filter/css_generator.rb', line 36

def encode_images_for_ie!(content, path)
  encode_images_basic!(content) do |image_data, tag|
    "#{tag}url(mhtml:#{construct_mhtml_link(path)}!#{image_data.id})"
  end
end

#set_settings(settings) ⇒ Object 



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# File 'lib/web_resource_bundler/filters/image_encode_filter/css_generator.rb', line 17

def set_settings(settings)
  @settings = settings
end