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.