You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: image_tag.rb
    path of file: ./repos/octopress/plugins
    
    the code of the file until where you have to start completion: # Title: Simple Image tag for Jekyll
# Authors: Brandon Mathis http://brandonmathis.com
#          Felix Sch√§fer, Frederic Hemberger
# Description: Easily output images with optional class names, width, height, title and alt attributes
#
# Syntax {% img [class name(s)] [http[s]:/]/path/to/image [width [height]] [title text | "title text" [
    
    def initialize(tag_name, markup, tokens)
      attributes = ['class', 'src', 'width', 'height', 'title']

      if markup =~ /(?<class>\S.*\s+)?(?<src>(?:https?:\/\/|\/|\S+\/)\S+)(?:\s+(?<width>\d+))?(?:\s+(?<height>\d+))?(?<title>\s+.+)?/i
        @img = attributes.reduce({}) { |img, attr| img[attr] = $~[attr].strip if $~[attr]; img }
        if /(?:"|')(?<title>[^"']+)?(?:"|')\s+(?:"|')(?<alt>[^"']+)?(?:"|')/ =~ @img['title']
          @img['title']  = title
          @img['alt']    = alt
        else
          @img['alt']    = @img['title'].gsub!(/"/, '&#34;') if @img['title']
        end