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: view_translation_substitutor.rb
    path of file: ./repos/expertiza/app/models
    
    the code of the file until where you have to start completion: require 'yaml'

class ViewTranslationSubstitutor
  BLACKLIST = "([a-zA-Z0-9\\._]+|[\"\\'])?".freeze

  def substitute(locale)
    stats = {}
    locale.each { |dir_name, view_hash| stats[dir_name] = process_directory(dir_name, view_hash) }
    File.open("translation_stats#{Time.now}.yml", 'w') { |file| file.write(stats.to_yaml) }
  end

  private

  def process_directory(dir_name, view_hash)
    dir_stats = {}
    view_hash.each { |view_name, translations| dir_stats[view_name] = process_view(dir_name, view_name, translations) }
    dir_stats
  end

  def process_view(directory_name, view_name, translations)
    path = "./#{directory_name}/#{view_name}.html.erb"
    
  def process_translation(contents, key, val)
    replacements = []
    skips = []
    resume_index = 0
    while resume_index < contents.length
      match_data = contents[resume_index, contents.length].match(/#{BLACKLIST}(\s+)?(#{Regexp.escape(val)})(\s+)?#{BLACKLIST}/)
      break if match_data.nil?

      match_begin = resume_index + match_data.begin(0)
      match_end = resume_index + match_data.end(0)
      matched_text = match_data[0]
      black_start = match_data[1]
      white_start = match_data[2]
      white_end = match_data[4]
      black_end = match_data[5]

      if black_start == black_end && (black_start.nil? || %W[\" '].include?(black_start))
        t_call = black_start.nil? ? "<%=t \".#{key}\"%>" : "t(\".#{key}\")"
        replacement = "#{white_start}#{t_call}#{white_end}"
        replacements += [contents[match_begin, matched_text.length]]
        contents[match_begin, matched_text.length] = replacement
        resume_index = match_begin + replacement.length
      else
        resume_index = match_end
        skips += [matched_text]
      end