Module: CdnHelpers::CssRewriter

Defined in:
lib/cdn_helpers.rb

Class Method Summary collapse

Class Method Details

.process_css_file(logger, css_file, css_file_path, public_root_path, url_prefix = '/') ⇒ Object 



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# File 'lib/cdn_helpers.rb', line 99

def self.process_css_file(logger, css_file, css_file_path, public_root_path, url_prefix = '/')
  out_lines = []
  css_file_path = Pathname.new(css_file_path).realpath
  public_root_path = Pathname.new(public_root_path)
  context_path = css_file_path.parent
  while line = css_file.gets
    out_lines << line.gsub(/url\(["']?([^"'\)]+)["']?\)/) do |url_match|
      if URI.parse($1).scheme.nil?
        local_url = Pathname.new($1)
        if local_url.relative?
          file_path = context_path.join(local_url).cleanpath.relative_path_from(public_root_path).to_s
        else
          url_prefix = url_prefix + '/' unless url_prefix.rindex('/') == (url_prefix.length - 1)

          if local_url.to_s.index(url_prefix) == 0
            local_url = local_url.to_s[(url_prefix.length - 1)..-1] 
          else
            local_url = local_url.to_s
          end
          
          file_path = public_root_path.join(local_url[1..-1]).cleanpath.relative_path_from(public_root_path).to_s
        end
        "url(#{url_prefix[0..-2]}#{CdnHelpers::AssetPath.hash_file("/" + file_path, public_root_path, logger)})"
      else
        "url(#{$1})"
      end
    end
  end
  css_file.close
  out_lines.join("")
end

.rewrite_css_file(logger, css_file_path, public_root_path, url_prefix = '/') ⇒ Object 



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# File 'lib/cdn_helpers.rb', line 92

def self.rewrite_css_file(logger, css_file_path, public_root_path, url_prefix = '/')
  logger.info("Rewriting CSS file URLs in #{css_file_path}")
  css_file = File.open(css_file_path)
  output = process_css_file(logger, css_file, css_file_path, public_root_path, url_prefix)
  File.open(css_file_path, 'w') { |f| f.write(output) }
end