class Middleman::Extensions::MinifyJavascript::Rack

def call(env)
  status, headers, response = @app.call(env)
  path = env['PATH_INFO']
  begin
    if @inline && (path.end_with?('.html') || path.end_with?('.php'))
      uncompressed_source = ::Middleman::Util.extract_response_text(response)
      minified = minify_inline_content(uncompressed_source)
      headers['Content-Length'] = ::Rack::Utils.bytesize(minified).to_s
      response = [minified]
    elsif path.end_with?('.js') && @ignore.none? { |ignore| Middleman::Util.path_match(ignore, path) }
      uncompressed_source = ::Middleman::Util.extract_response_text(response)
      minified = @compressor.compress(uncompressed_source)
      headers['Content-Length'] = ::Rack::Utils.bytesize(minified).to_s
      response = [minified]
    end
  rescue ExecJS::ProgramError => e
    warn "WARNING: Couldn't compress JavaScript in #{path}: #{e.message}"
  end
  [status, headers, response]
end

def initialize(app, options={})
  @app = app
  @ignore = options.fetch(:ignore)
  @inline = options.fetch(:inline)
  @compressor = options.fetch(:compressor)
  @compressor = @compressor.to_proc if @compressor.respond_to? :to_proc
  @compressor = @compressor.call if @compressor.is_a? Proc
end

def minify_inline_content(uncompressed_source)
  uncompressed_source.gsub(/(<script[^>]*>\s*(?:\/\/(?:(?:<!--)|(?:<!\[CDATA\[))\n)?)(.*?)((?:(?:\n\s*)?\/\/(?:(?:-->)|(?:\]\]>)))?\s*<\/script>)/m) do |match|
    first = $1
    javascript = $2
    last = $3
    # Only compress script tags that contain JavaScript (as opposed
    # to something like jQuery templates, identified with a "text/html"
    # type.
    if first =~ /<script>/ || first.include?('text/javascript')
      minified_js = @compressor.compress(javascript)
      first << minified_js << last
    else
      match
    end
  end
end