Ruby ffast

A library and cli tool for searching/matching nodes within ruby's AST.

Documentation

github

https://github.com/jonatas/fast

Install

gem install ffast

Usage

fast --ast some/file.rb            # show ast
fast '(const _ _)' some/file.rb    # find matching in some/file.rb

sample patterns

# an object 'Foo' initialized with the keyword-argument 'two'
'(send (const {nil _} :Foo) :new (hash ... (pair (sym :two)) ))'
Foo.new(one: "abc", two: "def", three: "ghi")


# assignment of 'two' in a specific method call
fast --ast '(send {nil _} :sayhi {nil ...} (str "two") {nil ...})' foo.rb
sayhi("one", "two", "three")