A fast Ruby parser and formatter with only standard library dependencies.

Add this line to your application's Gemfile:

gem "syntax_tree"

And then execute:

$ bundle install

Or install it yourself as:

$ gem install syntax_tree

From code:

require "syntax_tree"

pp SyntaxTree.parse(source) # print out the AST
puts SyntaxTree.format(source) # format the AST

From the CLI:

$ stree ast program.rb
(program
  (statements
    ...

or

$ stree format program.rb
class MyClass
  ...

or

$ stree write program.rb
program.rb 1ms

After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/ruby-syntax-tree/syntax_tree.

The gem is available as open source under the terms of the MIT License.