identify routes defined by hashes that are not declared in routes.rb

missing_routes.rb

desc 'identify routes defined by hashes that are not declared in routes.rb'
task :missing_routes => :environment do

  file_paths = FileList[
    "#{Rails.root}/app/helpers/**/*.rb",
    "#{Rails.root}/app/views/**/*.html.erb"
  ]
  
  file_paths.each do |file_path|

    errors = []

    File.read(file_path).scan(url_hash_regex) do |match|
    
      hash = sanitize($&).merge({only_path: true})
    
      begin
        Rails.application.routes.url_for(hash)
      rescue => e
        errors << e.message
      end
    end

    print_errors(file_path, errors) if errors.size > 0
    
  end
end

def print_errors path, errors
  puts path
  puts "=" * path.length
  errors.each do |e|
    puts e
  end
  puts "\n\n"
end



def sanitize string
  string
    .split(',')
    .map do |pair|
      resolve_key_and_value pair do |match|
        create_hash_from match
      end
    end
    .reduce(:merge)
end

def resolve_key_and_value pair, &block
  HashMatcher
  .new(value: :no_quotes)
  .expression
  .match(pair) do |match|
    yield match
  end
end

def create_hash_from match
  return match[1].present? ? 
    { match[1] => fake_value(match[2]) } :
    { match[3] => fake_value(match[4]) }
end

def fake_value value
  value =~ /^@|\.|\[|\(/ ? "faked" : value
end

def url_hash_regex
  action_controller_pair = HashMatcher
    .new(key: /action|controller/)
    .expression

  generic_pair = HashMatcher
    .new
    .expression

  /(#{action_controller_pair})(?:,\s*(#{generic_pair}))*/
end


class HashMatcher
  
  attr_accessor :expression
  
  attr_reader :key, :value
  
  VALUE_WITH_QUOTES = /([\w:'"\.\/@\(\)\[\]-]*)/
  
  VALUE_WITHOUT_QUOTES = /['":]?([\w\.\/@\(\)\[\]-]*)['"]?/

  def initialize opts={}
    @key = opts[:key] || /[\w]*/
    @value = if opts[:value] == :no_quotes
        VALUE_WITHOUT_QUOTES
      else
        opts[:value] || VALUE_WITH_QUOTES
      end
    @expression = /#{hash_rocket}|#{ruby_1_9}/
  end
    
  def hash_rocket
    /:(#{key})\s*=>\s#{value}/
  end
  
  def ruby_1_9
    /(#{key}):\s#{value}/
  end
    
end