AST::Navigator

AST::Navigator provides some utility functions for AST::Node objects, including parent(node), ancestors(node), siblings(node).

Add this line to your application's Gemfile:

gem 'ast-navigator'

And then execute:

$ bundle

Or install it yourself as:

$ gem install ast-navigator

require "ast/navigator"

navigator = AST::Navigator.new()

# Add root node to navigator
navigator.add_root_node(node)

# Returns parent node or nil
navigator.parent(node.children[0])

# Returns array of ancestor nodes
navigator.ancestors(node.children[0].children[1].children[3])

# Yields child node of given node, non AST::Node children will be ignored
navigator.each_child(node) do ... end

# Yields sibling nodes of given node, non AST::Node siblings will be ignored
navigator.each_sibling(node) do ... end

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/soutaro/ast-navigator.