Use math.js

[tomek-he-him]

http://mathjs.org/docs/expressions/syntax.html – this is the best formal spec for an arithmetic grammar I’ve found. A JS implementation is readily available and it’s much more robust than the current proof-of-concept eval-based code.

The thing is opt-in and extensible (http://mathjs.org/docs/custom_bundling.html). It’s easy to implement in other languages.

An open question remains: how extensible should parametric-svg.js be?

• Should we take a custom evaluator – leave the option to replace math.parser with your own thing?
• Should we publish our instance of math to allow extending it? (I’m not a fan of this idea.)

[tomek-he-him]

https://github.com/parametric-svg/-/tree/d7be8f275252640fcdcc24befdacb56427396156/packages/parametric-svg-parse already uses mathjs under the hood.