Class: Epuber::Compiler::FileTypes::CSSFile

Inherits:
SourceFile show all
Defined in:
lib/epuber/compiler/file_types/css_file.rb

Direct Known Subclasses

StylusFile

Constant Summary collapse

DECLARATION_TO_FILE_GROUP_MAP = 
{
  'background' => :image,
  'background-image' => :image,
  'list-style' => :image,
  'list-style-image' => :image,
  'content' => :image,
  'cursor' => :image,
  'border-image' => :image,
  'border-image-source' => :image,
  'mask-image' => :image,
  'mask-box-image' => :image,
  'src' => :font,
}.freeze
URL_REGEXP = 
/url\((.+?)\)/.freeze

Instance Attribute Summary

Attributes inherited from SourceFile

#abs_source_path, #file_request, #source_path

Attributes inherited from AbstractFile

#compilation_context, #destination_path, #final_destination_path, #group, #path_type, #pkg_destination_path, #properties

Instance Method Summary collapse

Methods inherited from SourceFile

#default_file_copy, #destination_file_exist?, #destination_file_up_to_date?, #find_dependencies, #initialize, #properties, resolve_relative_file, #source_file_up_to_date?, #update_metadata!, #write_compiled, #write_processed

Methods inherited from AbstractFile

#==, file_copy!, write_to_file, write_to_file!, write_to_file?

Constructor Details

This class inherits a constructor from Epuber::Compiler::FileTypes::SourceFile

Instance Method Details

#process(compilation_context) ⇒ Object

Parameters:



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# File 'lib/epuber/compiler/file_types/css_file.rb', line 29

def process(compilation_context)
  if destination_file_up_to_date?
    # HACK: for now, we need to process the file again, because we need to find linked files
    process_css(File.read(final_destination_path), compilation_context)
  else
    write_processed(process_css(File.read(abs_source_path), compilation_context))
  end
end

#process_css(content, compilation_context) ⇒ String

Processes CSS file, resolves all linked files and adds them to file resolver

Parameters:

Returns:

  • (String) 


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# File 'lib/epuber/compiler/file_types/css_file.rb', line 45

def process_css(content, compilation_context)
  parser = UI.print_step_processing_time('css parsing') do
    parser = CssParser::Parser.new
    parser.load_string!(content)
    parser
  end

  # resolve links to files, add other linked resources and compute correct path
  UI.print_step_processing_time('resolving url()') do
    parser.each_rule_set do |rule_set, _media_types|
      # @type [CssParser::RuleSet::Declarations]
      declarations = rule_set.instance_eval { @declarations }
      declarations.each do |property, decl_value|
        decl_value.to_s.scan(URL_REGEXP) do
          url_function = Regexp.last_match(0)
          path = Regexp.last_match(1)
          if path.start_with?('"') && path.end_with?('"')
            path = path[1..-2]
            quote = '"'
          end
          if path.start_with?("'") && path.end_with?("'")
            path = path[1..-2]
            quote = "'"
          end

          next if path.start_with?('data:') || path.start_with?('http://') || path.start_with?('https://')

          resource_group = DECLARATION_TO_FILE_GROUP_MAP[property]
          new_url = SourceFile.resolve_relative_file(destination_path,
                                                     path,
                                                     compilation_context.file_resolver,
                                                     group: resource_group,
                                                     location: self)

          content = content.gsub(url_function, "url(#{quote}#{new_url}#{quote})") if new_url
        end
      end
    end
  end

  content
end