Detect arbitrary variants with quotes (#8687)

* Refactor

* Support variants with quotes in them

We have to have two regexes here because this is actually ambiguous in the general case. The regex that generally handles `[&[foo='bar']]` would incorrectly match `['bar':'baz']` for instance. So, instead we’ll use multiple regexes and match both!

* Update changelog

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 
 - Provide default to `<alpha-value>` when using `theme()` ([#8652](https://github.com/tailwindlabs/tailwindcss/pull/8652))
+- Detect arbitrary variants with quotes ([#8687](https://github.com/tailwindlabs/tailwindcss/pull/8687))
 
 ## [3.1.3] - 2022-06-14
 

src/lib/defaultExtractor.js

@@ -64,31 +64,41 @@ function* buildRegExps(context) {
     ]),
   ])
 
-  yield regex.pattern([
-    // Variants
-    '((?=((',
-    regex.any(
-      [
-        regex.pattern([/([^\s"'`\[\\]+-)?\[[^\s"'`]+\]/, separator]),
-        regex.pattern([/[^\s"'`\[\\]+/, separator]),
-      ],
-      true
-    ),
-    ')+))\\2)?',
+  let variantPatterns = [
+    // Without quotes
+    regex.any([
+      regex.pattern([/([^\s"'`\[\\]+-)?\[[^\s"'`]+\]/, separator]),
+      regex.pattern([/[^\s"'`\[\\]+/, separator]),
+    ]),
 
-    // Important (optional)
-    /!?/,
+    // With quotes allowed
+    regex.any([
+      regex.pattern([/([^\s"'`\[\\]+-)?\[[^\s`]+\]/, separator]),
+      regex.pattern([/[^\s`\[\\]+/, separator]),
+    ]),
+  ]
 
-    variantGroupingEnabled
-      ? regex.any([
-          // Or any of those things but grouped separated by commas
-          regex.pattern([/\(/, utility, regex.zeroOrMore([/,/, utility]), /\)/]),
+  for (const variantPattern of variantPatterns) {
+    yield regex.pattern([
+      // Variants
+      '((?=((',
+      variantPattern,
+      ')+))\\2)?',
 
-          // Arbitrary properties, constrained utilities, arbitrary values, etc…
-          utility,
-        ])
-      : utility,
-  ])
+      // Important (optional)
+      /!?/,
+
+      variantGroupingEnabled
+        ? regex.any([
+            // Or any of those things but grouped separated by commas
+            regex.pattern([/\(/, utility, regex.zeroOrMore([/,/, utility]), /\)/]),
+
+            // Arbitrary properties, constrained utilities, arbitrary values, etc…
+            utility,
+          ])
+        : utility,
+    ])
+  }
 
   // 5. Inner matches
   yield /[^<>"'`\s.(){}[\]#=%$]*[^<>"'`\s.(){}[\]#=%:$]/g

tests/arbitrary-variants.test.js

@@ -493,3 +493,37 @@ test('keeps escaped underscores in arbitrary variants mixed with normal variants
     `)
   })
 })
+
+test('allows attribute variants with quotes', () => {
+  let config = {
+    content: [
+      {
+        raw: `
+          <div class="[&[data-test='2']]:underline"></div>
+          <div class='[&[data-test="2"]]:underline'></div>
+        `,
+      },
+    ],
+    corePlugins: { preflight: false },
+  }
+
+  let input = `
+    @tailwind base;
+    @tailwind components;
+    @tailwind utilities;
+  `
+
+  return run(input, config).then((result) => {
+    expect(result.css).toMatchFormattedCss(css`
+      ${defaults}
+
+      .\[\&\[data-test\=\'2\'\]\]\:underline[data-test="2"] {
+        text-decoration-line: underline;
+      }
+
+      .\[\&\[data-test\=\"2\"\]\]\:underline[data-test='2'] {
+        text-decoration-line: underline;
+      }
+    `)
+  })
+})