Radix Tree implementation for Crystal
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Allow usage of `make spec` to run project's specs against default
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Latest commit 905bd9e Sep 22, 2017


Radix Tree

Radix tree implementation for Crystal language

Build Status Latest Release


Add this to your application's shard.yml:

    github: luislavena/radix


Building Trees

You can associate a payload with each path added to the tree:

require "radix"

tree = Radix::Tree(Symbol).new
tree.add "/products", :products
tree.add "/products/featured", :featured

result = tree.find "/products/featured"

if result.found?
  puts result.payload # => :featured

The types allowed for payload are defined on Tree definition:

tree = Radix::Tree(Symbol).new

# Good, since Symbol is allowed as payload
tree.add "/", :root

# Compilation error, Int32 is not allowed
tree.add "/meaning-of-life", 42

Can combine multiple types if needed:

tree = Radix::Tree(Int32 | String | Symbol).new

tree.add "/", :root
tree.add "/meaning-of-life", 42
tree.add "/hello", "world"

Lookup and placeholders

You can also extract values from placeholders (as named segments or globbing):

tree.add "/products/:id", :product

result = tree.find "/products/1234"

if result.found?
  puts result.params["id"]? # => "1234"

Please see Radix::Tree#add documentation for more usage examples.


Pretty much all Radix implementations have their limitations and this project is no exception.

When designing and adding paths to a Tree, please consider that two different named parameters cannot share the same level:

tree.add "/", :root
tree.add "/:post", :post
tree.add "/:category/:post", :category_post # => Radix::Tree::SharedKeyError

This is because different named parameters at the same level will result in incorrect params when lookup is performed, and sometimes the value for post or category parameters will not be stored as expected.

To avoid this issue, usage of explicit keys that differentiate each path is recommended.

For example, following a good SEO practice will be consider /:post as absolute permalink for the post and have a list of categories which links to the permalinks of the posts under that category:

tree.add "/", :root
tree.add "/:post", :post                    # this is post permalink
tree.add "/categories", :categories         # list of categories
tree.add "/categories/:category", :category # listing of posts under each category


This project has been inspired and adapted from julienschmidt/httprouter and spriet2000/vertx-http-router Go and Java implementations, respectively.

Changes to logic and optimizations have been made to take advantage of Crystal's features.


  1. Fork it ( https://github.com/luislavena/radix/fork )
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create a new Pull Request