Incorrect syntax highlighting for "hidden" opening parentheses

[ojwb]

Example:

https://bbcmic.ro/#%7B%22v%22%3A1%2C%22program%22%3A%22A%24%3D%5C%22OWLET%5C%22%3AP.RI.A%24%2C1%29LE.A%24%2C2%29MI.A%24%2C4%2C1%29MI.A%24%2C3%2C1%29%22%7D

RI. is an abbreviation for RIGHT$( (so there's an open parenthesis but it's "hidden") - however owlet colours the corresponding closing ) in red because it thinks there's a missing opening ( (and similarly for all such cases it seems).

It seems bracket syntax highlighting uses a builtin feature of the editor component so this may not be easy to fix:

brackets: [["(", ")", "delimiter.parenthesis"]],

[ojwb]

I found https://microsoft.github.io/monaco-editor/monarch-static.html#complexmatch - it seems the abbreviated token with the hidden opening parenthesis (e.g. RI.) would need to have the same token class as the closing parenthesis though. We can't really change the latter without doing our own matching of parentheses, so I guess we'd need to make RI.'s token class delimiter.parenthesis and similarly for all the abbreviated tokens with a hidden (. Not ideal but better than mishighlighting the closing parenthesis as unmatched.

[mattgodbolt]

Amazing stuff olly; thanks for this! How much are you using owlet!? 😀

[ojwb]

Arguably too much