我想在我的全新 Rails 项目中使用 Metrical，使用 Ruby 1.9 哈希语法做一些事情
before_filter :guest_user, only: [:new, :create]
before_filter :correct_user, only: :destroy
我得到这个错误：
/Users/xxx/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/racc/parser.rb:351:in `on_error': (Racc::ParseError)
parse error on value ":" (tCOLON)
我做了一些调查，发现 ruby_parser gem 不支持 1.9 哈希语法（请参阅 github 问题） - 不知道哪个版本指的是我试图将 ruby_parser gem 更新到 2.3.1 不起作用因为 metrical 中包含的一些代码质量工具需要 ruby_parser 2.0 版本。
有没有办法解决这个问题（除了回滚到旧语法）？我也有点困惑，因为一些代码质量工具似乎已经过时了，检查RubyToolBox证实了这种印象。还是我在这里遗漏了一些基本的东西？
（这是我的 Gemfile.lock 供参考）：
GEM
remote: https://rubygems.org/
specs:
Saikuro (1.1.0)
actionmailer (3.2.6)
actionpack (= 3.2.6)
mail (~> 2.4.4)
actionpack (3.2.6)
activemodel (= 3.2.6)
activesupport (= 3.2.6)
builder (~> 3.0.0)
erubis (~> 2.7.0)
journey (~> 1.0.1)
rack (~> 1.4.0)
rack-cache (~> 1.2)
rack-test (~> 0.6.1)
sprockets (~> 2.1.3)
activemodel (3.2.6)
activesupport (= 3.2.6)
builder (~> 3.0.0)
activerecord (3.2.6)
activemodel (= 3.2.6)
activesupport (= 3.2.6)
arel (~> 3.0.2)
tzinfo (~> 0.3.29)
activeresource (3.2.6)
activemodel (= 3.2.6)
activesupport (= 3.2.6)
activesupport (3.2.6)
i18n (~> 0.6)
multi_json (~> 1.0)
addressable (2.2.8)
arel (3.0.2)
arrayfields (4.7.4)
awesome_print (1.0.2)
bcrypt-ruby (3.0.1)
bootstrap-sass (2.0.4.0)
bootstrap-will_paginate (0.0.7)
will_paginate
builder (3.0.0)
capybara (1.1.2)
mime-types (>= 1.16)
nokogiri (>= 1.3.3)
rack (>= 1.0.0)
rack-test (>= 0.5.4)
selenium-webdriver (~> 2.0)
xpath (~> 0.1.4)
childprocess (0.3.4)
ffi (~> 1.0, >= 1.0.6)
chronic (0.3.0)
churn (0.0.13)
chronic (>= 0.2.3)
hirb
json_pure
main
ruby_parser (~> 2.0.4)
sexp_processor (~> 3.0.3)
coffee-rails (3.2.2)
coffee-script (>= 2.2.0)
railties (~> 3.2.0)
coffee-script (2.2.0)
coffee-script-source
execjs
coffee-script-source (1.3.3)
colored (1.2)
cucumber (1.2.1)
builder (>= 2.1.2)
diff-lcs (>= 1.1.3)
gherkin (~> 2.11.0)
json (>= 1.4.6)
cucumber-rails (1.3.0)
capybara (>= 1.1.2)
cucumber (>= 1.1.8)
nokogiri (>= 1.5.0)
database_cleaner (0.7.2)
diff-lcs (1.1.3)
erubis (2.7.0)
execjs (1.4.0)
multi_json (~> 1.0)
factory_girl (3.5.0)
activesupport (>= 3.0.0)
factory_girl_rails (3.5.0)
factory_girl (~> 3.5.0)
railties (>= 3.0.0)
faker (1.0.1)
i18n (~> 0.4)
fattr (2.2.1)
ffi (1.1.0)
flay (1.4.3)
ruby_parser (~> 2.0)
sexp_processor (~> 3.0)
flog (2.5.3)
ruby_parser (~> 2.0)
sexp_processor (~> 3.0)
gherkin (2.11.1)
json (>= 1.4.6)
growl (1.0.3)
guard (1.2.3)
listen (>= 0.4.2)
thor (>= 0.14.6)
guard-rspec (1.2.0)
guard (>= 1.1)
guard-spork (1.1.0)
guard (>= 1.1)
spork (>= 0.8.4)
hike (1.2.1)
hirb (0.7.0)
i18n (0.6.0)
journey (1.0.4)
jquery-rails (2.0.2)
railties (>= 3.2.0, < 5.0)
thor (~> 0.14)
json (1.7.3)
json_pure (1.7.3)
launchy (2.1.0)
addressable (~> 2.2.6)
libwebsocket (0.1.4)
addressable
listen (0.4.7)
rb-fchange (~> 0.0.5)
rb-fsevent (~> 0.9.1)
rb-inotify (~> 0.8.8)
mail (2.4.4)
i18n (>= 0.4.0)
mime-types (~> 1.16)
treetop (~> 1.4.8)
main (4.7.1)
map (6.2.0)
metric_fu (2.1.1)
Saikuro (>= 1.1.0)
activesupport (>= 2.0.0)
chronic (~> 0.3.0)
churn (>= 0.0.7)
flay (>= 1.2.1)
flog (>= 2.3.0)
rails_best_practices (>= 0.6.4)
rcov (>= 0.8.3.3)
reek (>= 1.2.6)
roodi (>= 2.1.0)
syntax
metrical (0.1.0)
metric_fu (~> 2.1.1)
rcov (~> 0.9)
mime-types (1.19)
multi_json (1.3.6)
nokogiri (1.5.5)
pg (0.14.0)
polyglot (0.3.3)
progressbar (0.11.0)
rack (1.4.1)
rack-cache (1.2)
rack (>= 0.4)
rack-ssl (1.3.2)
rack
rack-test (0.6.1)
rack (>= 1.0)
rails (3.2.6)
actionmailer (= 3.2.6)
actionpack (= 3.2.6)
activerecord (= 3.2.6)
activeresource (= 3.2.6)
activesupport (= 3.2.6)
bundler (~> 1.0)
railties (= 3.2.6)
rails_best_practices (1.10.1)
activesupport
awesome_print
colored
erubis
i18n
progressbar
sexp_processor
railties (3.2.6)
actionpack (= 3.2.6)
activesupport (= 3.2.6)
rack-ssl (~> 1.3.2)
rake (>= 0.8.7)
rdoc (~> 3.4)
thor (>= 0.14.6, < 2.0)
rake (0.9.2.2)
rb-fchange (0.0.5)
ffi
rb-fsevent (0.9.1)
rb-inotify (0.8.8)
ffi (>= 0.5.0)
rcov (0.9.11)
rdoc (3.12)
json (~> 1.4)
reek (1.2.12)
ripper_ruby_parser (~> 0.0.7)
ruby2ruby (~> 1.2.5)
ruby_parser (~> 2.0)
sexp_processor (~> 3.0)
ripper_ruby_parser (0.0.8)
sexp_processor (~> 3.0)
roodi (2.1.0)
ruby_parser
rspec (2.11.0)
rspec-core (~> 2.11.0)
rspec-expectations (~> 2.11.0)
rspec-mocks (~> 2.11.0)
rspec-core (2.11.1)
rspec-expectations (2.11.1)
diff-lcs (~> 1.1.3)
rspec-mocks (2.11.1)
rspec-rails (2.11.0)
actionpack (>= 3.0)
activesupport (>= 3.0)
railties (>= 3.0)
rspec (~> 2.11.0)
ruby2ruby (1.2.5)
ruby_parser (~> 2.0)
sexp_processor (~> 3.0)
ruby_parser (2.0.6)
sexp_processor (~> 3.0)
rubyzip (0.9.9)
sass (3.1.20)
sass-rails (3.2.5)
railties (~> 3.2.0)
sass (>= 3.1.10)
tilt (~> 1.3)
selenium-webdriver (2.25.0)
childprocess (>= 0.2.5)
libwebsocket (~> 0.1.3)
multi_json (~> 1.0)
rubyzip
sexp_processor (3.0.10)
simplecov (0.6.4)
multi_json (~> 1.0)
simplecov-html (~> 0.5.3)
simplecov-html (0.5.3)
spork (0.9.2)
sprockets (2.1.3)
hike (~> 1.2)
rack (~> 1.0)
tilt (~> 1.1, != 1.3.0)
sqlite3 (1.3.6)
syntax (1.0.0)
thor (0.15.4)
tilt (1.3.3)
treetop (1.4.10)
polyglot
polyglot (>= 0.3.1)
tzinfo (0.3.33)
uglifier (1.2.6)
execjs (>= 0.3.0)
multi_json (~> 1.3)
will_paginate (3.0.3)
xpath (0.1.4)
nokogiri (~> 1.3)
PLATFORMS
ruby
DEPENDENCIES
arrayfields
bcrypt-ruby
bootstrap-sass
bootstrap-will_paginate
capybara
coffee-rails
cucumber-rails
database_cleaner
factory_girl_rails
faker
fattr
growl
guard-rspec
guard-spork
jquery-rails
launchy
map
metrical
pg
rails (= 3.2.6)
rb-fsevent
rspec-rails
sass-rails
simplecov
spork
sqlite3
uglifier
will_paginate