Sometimes your application might need to let users configure some basic boolean logic rules which then have to be stored in a database somewhere. Maybe you have logic that needs to be shared across multiple platforms, or edited by non-technical contributors.

Boon, the bolean expression language, is a useful tool for these situations. It looks like this:

# Check if your pulled pork has the correct BBQ sauce
isVinegarBased AND NOT (sugaryKetchup OR mustard)

Boon supports the following operators (in descending precedence):

• NOT
• XOR
• AND
• OR

Parentheses can be used to override precedence. Quotation marks can be used for data identifiers that need spaces or other special characters. Comments start with a #. There is a full specification if you need more detail, but here are some examples to get you started:

# Great Sci-Fi Authors
"Octavia Butler" AND "N.K. Jemisin"

# We need exactly three Hugos for best novel
NOT "Lois McMaster Bujold" # She won too many!
AND 
("N.K. Jemisin"          # The Broken Earth Trilogy - Three in a row!
  OR 
  ("Ann Leckie"          # Ancillary Justice
    AND "Arkady Martine" # A Memory Called Empire
    AND "Martha Wells"   # Network Effect
  )
)

If you need similar behavior in JS, try boon-js, which I believe is the origin of the Boon spec.