sonic-pi

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

C++

Code. Music. Live.

Parslet::Atoms::DSL#present?

Tests for presence of a parslet atom in the input stream without consuming
it. 

Example: 
  # Only proceed the parse if 'a' is present.
  str('a').present?

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-present--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#present?"

# 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-present--for-pr

hub pull-request

# Celebrate!