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node_modules/tailwindcss/src/util/splitAtTopLevelOnly.js

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+/**
+ * This splits a string on a top-level character.
+ *
+ * Regex doesn't support recursion (at least not the JS-flavored version).
+ * So we have to use a tiny state machine to keep track of paren placement.
+ *
+ * Expected behavior using commas:
+ * var(--a, 0 0 1px rgb(0, 0, 0)), 0 0 1px rgb(0, 0, 0)
+ *       ─┬─             ┬  ┬    ┬
+ *        x              x  x    ╰──────── Split because top-level
+ *        ╰──────────────┴──┴───────────── Ignored b/c inside >= 1 levels of parens
+ *
+ * @param {string} input
+ * @param {string} separator
+ */
+export function splitAtTopLevelOnly(input, separator) {
+  let stack = []
+  let parts = []
+  let lastPos = 0
+  let isEscaped = false
+
+  for (let idx = 0; idx < input.length; idx++) {
+    let char = input[idx]
+
+    if (stack.length === 0 && char === separator[0] && !isEscaped) {
+      if (separator.length === 1 || input.slice(idx, idx + separator.length) === separator) {
+        parts.push(input.slice(lastPos, idx))
+        lastPos = idx + separator.length
+      }
+    }
+
+    if (isEscaped) {
+      isEscaped = false
+    } else if (char === '\\') {
+      isEscaped = true
+    }
+
+    if (char === '(' || char === '[' || char === '{') {
+      stack.push(char)
+    } else if (
+      (char === ')' && stack[stack.length - 1] === '(') ||
+      (char === ']' && stack[stack.length - 1] === '[') ||
+      (char === '}' && stack[stack.length - 1] === '{')
+    ) {
+      stack.pop()
+    }
+  }
+
+  parts.push(input.slice(lastPos))
+
+  return parts
+}