Precompute common values for same files in different rules

[mondeja]

I've just implemented a cache in simple-icons SVG linting rules to avoid parsing the same data for the same files over and over again (see simple-icons/simple-icons#9233) which gives a great performance improvement.

As this case is very common due the fact that SVGLint executes all function rules for the same set of files I think that could be added to the configuration by some hook or something like that. The implementation could be a function executed for each file before rules and some API added to function rules arguments to obtain the values.

Some thoughs about this?

[ericcornelissen]

I think this makes sense, I would not be entirely sure what this would look like in the API though 🤔 Do you have something in mind @mondeja, or do you know of some examples from other tooling?

Also, would you be interested in working on this? If so I can assign the issue to you and I'd be happy to review your work.

[mondeja]

I'll try to find other tools with this pattern before design the API, as I don't remember myself now see it ever 🤔 In that case I'll implement it, for sure.