fix(core): fix for svelte extractor

[chu121su12]

Should close #1828

Caveat: this would make svelte extractor not supporting data-x and aria-x variants directly.

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[antfu]

Does that mean in Svelte you can't use rules with =? Would that be a bit confusing and inconsistent?

[chu121su12]

The two variants if not using theme mostly depends on the = in attribute selector (ex.: data-[a~=b]:rule). And since the update brings back splitting on =, rules with = may never get matched directly; except when manually generated via uno.generate().

Although if the syntax is per the issue class:text-orange-400={foo}, I think we can do left + right trim, of ex. /class:(.*)\s*=\s*/, as another workaround; due to the other split will happen at the character {. The extractor already split and do the left trim:

unocss/packages/core/src/extractors/svelte.ts

Line 11 in 73d00d6

return r.startsWith('class:') ? r.slice(6) : r

[chu121su12]

Added the right trim as of a36f54b. @pheuter If you don't mind, please check the syntax usage in the test.

[pheuter]

Looks about right to me 👀

The particular example in my issue is prob the most common, but not exhaustive of the possible syntax that can be parsed, like this one that currently works too for example:

<div class:text-[32px]={true} />

[chu121su12]

I'm sorry I don't know svelte syntax much. If the syntax is abc={def without any spaces then the latest update should work the same. If there's more combination other than the ={, it may warrant another workaround.

[pheuter]

The only other separator that comes to mind is ="{}" in addition to ={}

[chu121su12]

="{}" should be processed the same way as ={}