main repo

node_modules/motion-dom/dist/es/animation/utils/css-variables-conversion.mjs

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+import { invariant, isNumericalString } from 'motion-utils';
+import { isCSSVariableToken } from './is-css-variable.mjs';
+
+/**
+ * Parse Framer's special CSS variable format into a CSS token and a fallback.
+ *
+ * ```
+ * `var(--foo, #fff)` => [`--foo`, '#fff']
+ * ```
+ *
+ * @param current
+ */
+const splitCSSVariableRegex = 
+// eslint-disable-next-line redos-detector/no-unsafe-regex -- false positive, as it can match a lot of words
+/^var\(--(?:([\w-]+)|([\w-]+), ?([a-zA-Z\d ()%#.,-]+))\)/u;
+function parseCSSVariable(current) {
+    const match = splitCSSVariableRegex.exec(current);
+    if (!match)
+        return [,];
+    const [, token1, token2, fallback] = match;
+    return [`--${token1 ?? token2}`, fallback];
+}
+const maxDepth = 4;
+function getVariableValue(current, element, depth = 1) {
+    invariant(depth <= maxDepth, `Max CSS variable fallback depth detected in property "${current}". This may indicate a circular fallback dependency.`, "max-css-var-depth");
+    const [token, fallback] = parseCSSVariable(current);
+    // No CSS variable detected
+    if (!token)
+        return;
+    // Attempt to read this CSS variable off the element
+    const resolved = window.getComputedStyle(element).getPropertyValue(token);
+    if (resolved) {
+        const trimmed = resolved.trim();
+        return isNumericalString(trimmed) ? parseFloat(trimmed) : trimmed;
+    }
+    return isCSSVariableToken(fallback)
+        ? getVariableValue(fallback, element, depth + 1)
+        : fallback;
+}
+
+export { getVariableValue, parseCSSVariable };