move parts of migrate-modernize-arbitrary-values to core

The part where we upgrade old v3 syntax like `group-[]:` still exists in
the `@tailwindcss/upgrade` package.

We were relying on `postcss-selector-parser`, but the copied part is now
using our own `SelectorParser`.

I also added a temporary attribute selector parser to make everything
pass. Don't look at the code for that _too_ much because we will swap it
out in a later commit 😅

packages/@tailwindcss-upgrade/src/codemods/template/migrate-modernize-arbitrary-values.test.ts

@@ -22,29 +22,6 @@ function migrate(designSystem: DesignSystem, userConfig: UserConfig | null, rawC
 }
 
 test.each([
-  // Arbitrary variants
-  ['[[data-visible]]:flex', 'data-visible:flex'],
-  ['[&[data-visible]]:flex', 'data-visible:flex'],
-  ['[[data-visible]&]:flex', 'data-visible:flex'],
-  ['[&>[data-visible]]:flex', '*:data-visible:flex'],
-  ['[&_>_[data-visible]]:flex', '*:data-visible:flex'],
-  ['[&>*]:flex', '*:flex'],
-  ['[&_>_*]:flex', '*:flex'],
-
-  ['[&_[data-visible]]:flex', '**:data-visible:flex'],
-  ['[&_*]:flex', '**:flex'],
-
-  ['[&:first-child]:flex', 'first:flex'],
-  ['[&:not(:first-child)]:flex', 'not-first:flex'],
-
-  // in-* variants
-  ['[p_&]:flex', 'in-[p]:flex'],
-  ['[.foo_&]:flex', 'in-[.foo]:flex'],
-  ['[[data-visible]_&]:flex', 'in-data-visible:flex'],
-  // Multiple selectors, should stay as-is
-  ['[[data-foo][data-bar]_&]:flex', '[[data-foo][data-bar]_&]:flex'],
-  // Using `>` instead of ` ` should not be transformed:
-  ['[figure>&]:my-0', '[figure>&]:my-0'],
   // Some extreme examples of what happens in the wild:
   ['group-[]:flex', 'in-[.group]:flex'],
   ['group-[]/name:flex', 'in-[.group\\/name]:flex'],
@@ -59,71 +36,6 @@ test.each([
   ['has-group-[]/name:flex', 'has-in-[.group\\/name]:flex'],
   ['not-group-[]:flex', 'not-in-[.group]:flex'],
   ['not-group-[]/name:flex', 'not-in-[.group\\/name]:flex'],
-
-  // nth-child
-  ['[&:nth-child(2)]:flex', 'nth-2:flex'],
-  ['[&:not(:nth-child(2))]:flex', 'not-nth-2:flex'],
-
-  ['[&:nth-child(-n+3)]:flex', 'nth-[-n+3]:flex'],
-  ['[&:not(:nth-child(-n+3))]:flex', 'not-nth-[-n+3]:flex'],
-  ['[&:nth-child(-n_+_3)]:flex', 'nth-[-n+3]:flex'],
-  ['[&:not(:nth-child(-n_+_3))]:flex', 'not-nth-[-n+3]:flex'],
-
-  // nth-last-child
-  ['[&:nth-last-child(2)]:flex', 'nth-last-2:flex'],
-  ['[&:not(:nth-last-child(2))]:flex', 'not-nth-last-2:flex'],
-
-  ['[&:nth-last-child(-n+3)]:flex', 'nth-last-[-n+3]:flex'],
-  ['[&:not(:nth-last-child(-n+3))]:flex', 'not-nth-last-[-n+3]:flex'],
-  ['[&:nth-last-child(-n_+_3)]:flex', 'nth-last-[-n+3]:flex'],
-  ['[&:not(:nth-last-child(-n_+_3))]:flex', 'not-nth-last-[-n+3]:flex'],
-
-  // nth-child odd/even
-  ['[&:nth-child(odd)]:flex', 'odd:flex'],
-  ['[&:not(:nth-child(odd))]:flex', 'even:flex'],
-  ['[&:nth-child(even)]:flex', 'even:flex'],
-  ['[&:not(:nth-child(even))]:flex', 'odd:flex'],
-
-  // Keep multiple attribute selectors as-is
-  ['[[data-visible][data-dark]]:flex', '[[data-visible][data-dark]]:flex'],
-
-  // Keep `:where(…)` as is
-  ['[:where([data-visible])]:flex', '[:where([data-visible])]:flex'],
-
-  // Complex attribute selectors with operators, quotes and insensitivity flags
-  ['[[data-url*="example"]]:flex', 'data-[url*="example"]:flex'],
-  ['[[data-url$=".com"_i]]:flex', 'data-[url$=".com"_i]:flex'],
-  ['[[data-url$=.com_i]]:flex', 'data-[url$=.com_i]:flex'],
-
-  // Attribute selector wrapped in `&:is(…)`
-  ['[&:is([data-visible])]:flex', 'data-visible:flex'],
-
-  // Media queries
-  ['[@media(pointer:fine)]:flex', 'pointer-fine:flex'],
-  ['[@media_(pointer_:_fine)]:flex', 'pointer-fine:flex'],
-  ['[@media_not_(pointer_:_fine)]:flex', 'not-pointer-fine:flex'],
-  ['[@media_print]:flex', 'print:flex'],
-  ['[@media_not_print]:flex', 'not-print:flex'],
-
-  // Hoist the `:not` part to a compound variant
-  ['[@media_not_(prefers-color-scheme:dark)]:flex', 'not-dark:flex'],
-  [
-    '[@media_not_(prefers-color-scheme:unknown)]:flex',
-    'not-[@media_(prefers-color-scheme:unknown)]:flex',
-  ],
-
-  // Compound arbitrary variants
-  ['has-[[data-visible]]:flex', 'has-data-visible:flex'],
-  ['has-[&:is([data-visible])]:flex', 'has-data-visible:flex'],
-  ['has-[&>[data-visible]]:flex', 'has-[&>[data-visible]]:flex'],
-
-  ['has-[[data-slot=description]]:flex', 'has-data-[slot=description]:flex'],
-  ['has-[&:is([data-slot=description])]:flex', 'has-data-[slot=description]:flex'],
-
-  ['has-[[aria-visible="true"]]:flex', 'has-aria-visible:flex'],
-  ['has-[[aria-visible]]:flex', 'has-aria-[visible]:flex'],
-
-  ['has-[&:not(:nth-child(even))]:flex', 'has-odd:flex'],
 ])('%s => %s (%#)', async (candidate, result) => {
   let designSystem = await __unstable__loadDesignSystem('@import "tailwindcss";', {
     base: __dirname,