TransformTree provides an API for buildng trees of closures and executing those closures on provided input. This allows users to output all possible combinations of their desired transformations. A small library of useful transformations is included.

Until 1.0, minor versions contain breaking changes while patch versions are backwards compatible with respect to the API.

Add this line to your application's Gemfile:

gem 'transform_tree'

And then execute:

$ bundle

Or install it yourself as:

$ gem install transform_tree

tree = TransformTree::Root.new
upcase = ->(o) { o.upcase }
downcase = ->(o) { o.downcase }
append_s = ->(o) { "#{o}s" }
append_exc = ->(o) { "#{o}!" }

tree.add_transform(upcase, downcase, TransformTree::Transforms::null)
tree.add_transform(append_s, append_exc, TransformTree::Transforms::null)
tree.execute('Woof')

 => ["WOOFs", "WOOF!", "WOOF", "woofs", "woof!", "woof", "Woofs", "Woof!", "Woof"]

For full code examples, see integration specs in /spec/integrations.

The TransformTree::Transforms module provides some useful transformations. ret can be used to initially split your tree into distinct values, which are to be operated on later, e.g.

closures = superlatives.map {|w| TransformTree::Transforms::ret(w)}
tree.add_transforms(*closures)

If you prefer, you can build the tree without using Transforms::ret and instead simply make multiple calls to #execute, passing an object to process each time.

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec 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.

Bug reports and pull requests are welcome on GitHub at https://github.com/ffleming/transform_tree.

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