De-anonymizer for Javascript

Here is a snippet of Ruby code to de-anonymize anonymous functions in Javascript files. It could, for example, be used in a rake file of a rails project, or a Capistrano script.
It will make your debugging and stack tracing experience a lot more fruitful:

def deanonymize(file_name)
  content = ""
  line_counter = 1
  File.open(file_name).each_line do |line|
    content += line.gsub(/(\w*)(\.?)(\w*)\s*(=?)\s*function\s*\(/) {
      $1 + $2 + $3 + ' ' + $4 + ' function sbrew_' + $1 + '_' + $3 + '_' +
      file_name.split('/').last.sub(/.js$/i, '_js') + '_' + line_counter.to_s + '('
    }
    line_counter += 1
  end
  content
end

Note that it tries to put as much information as possible into a function name, but not all de-anonymized functions will look the same. The information it uses is:

• The file name


• Line number of the function declaration (note: this will make the stack traces look a bit unusual, as you might expect to see the execution line in that stack trace but it is the function declaration line)


• Enclosing object