Highlighting does not work for deeply nested brackets inside string templates

[ZiyaoWei]

Not sure if this is a flix issue or a VSCode extension issue.

If it is worth it I'd love to look into it, would appreciate some pointers :-)

[mlutze]

There are actually two sources of highlighting: syntactic and semantic. The extension provides the syntactic highlighting here: https://github.com/flix/vscode-flix/blob/master/syntaxes/flix.tmLanguage.json
And the semantic highlighting is provided by the compiler.

I suspect there is an issue with the syntactic highlighting rules. You can read about VSCode's API for that here: https://code.visualstudio.com/api/language-extensions/syntax-highlight-guide

[ZiyaoWei]

I actually think this is more of a brackets matching issue:

Note the horizontal bracket guides are apparently only considering ()s and not {}s, which should probably be fixed - will see if that fixes the issue.

EDIT: It seems that the issue is the template aren't being parsed correctly with the regexes, will look into it.

[ZiyaoWei]

It seems the real issue here is that the punctuation.definition.template-expression.begin.flix is not being matched with the right punctuation.definition.template-expression.end.flix, which confused the built in brackets matching algorithm. Will dig a bit more but probably not enough of a regex wizard to fix this bug.