jultty/wart-anyops

An exploration in custom rule creation for the WartRemover Scala linter

wart-AnyOps

Linting rules to prevent operations between numerical and non-numerical "primitives".

Addresses weirdness such as:

3 + 'a'     // 100
'a' + 'a'   // 194
'3' + 0     // 99
'a' == 97   // true

While I wouldn't like to get 3 from '3' + 0 (a char added to an integer) something as unpredictable as 99 is not ideal either.

In the example above, Scala performs implicit conversions through which the chars will be converted to their corresponding values in the ASCII table.

Operations with + and strings are already covered by the built-in wart StringPlusAny, upon which implementation this repo is largely based.

Caveats

This wart will not work if your project uses Scala 2 or does cross-compiling to Scala 2.

Usage

This project is built using sbt. Provided you have this repository cloned and a Scala environment configured, you can compile code with sbt compile, run it with sbt run, and launch a REPL with sbt console.