--- /dev/null
+module.exports = function walk(nodes, cb, bubble) {
+ var i, max, node, result;
+
+ for (i = 0, max = nodes.length; i < max; i += 1) {
+ node = nodes[i];
+ if (!bubble) {
+ result = cb(node, i, nodes);
+ }
+
+ if (
+ result !== false &&
+ node.type === "function" &&
+ Array.isArray(node.nodes)
+ ) {
+ walk(node.nodes, cb, bubble);
+ }
+
+ if (bubble) {
+ cb(node, i, nodes);
+ }
+ }
+};