sonic-pi

https://github.com/sonic-pi-net/sonic-pi

C++

Code. Music. Live.

Parslet::Atoms::DSL#maybe

Returns a new parslet atom that is only maybe present in the input. This
is synonymous to calling #repeat(0,1). Generated tree value will be 
either nil (if atom is not present in the input) or the matched subtree. 

Example: 
  str('foo').maybe

Source | Google | Stack overflow

Edit

git clone [email protected]:sonic-pi-net/sonic-pi.git

cd sonic-pi

open app/server/ruby/vendor/parslet/lib/parslet/atoms/dsl.rb

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-Parslet--Atoms--DSL-maybe-for-pr

# Commit to git

git add app/server/ruby/vendor/parslet/lib/parslet/atoms/dsl.rbgit commit -m "better docs for Parslet::Atoms::DSL#maybe"

# Open pull request

gem install hub # on a mac you can `brew install hub`

hub fork

git push <your name> -your-name--update-docs-Parslet--Atoms--DSL-maybe-for-pr

hub pull-request

# Celebrate!