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- "use strict";
-
- Object.defineProperty(exports, "__esModule", {
- value: true
- });
- exports.default = traverse;
-
- var _definitions = require("../definitions");
-
- function traverse(node, handlers, state) {
- if (typeof handlers === "function") {
- handlers = {
- enter: handlers
- };
- }
-
- const {
- enter,
- exit
- } = handlers;
- traverseSimpleImpl(node, enter, exit, state, []);
- }
-
- function traverseSimpleImpl(node, enter, exit, state, ancestors) {
- const keys = _definitions.VISITOR_KEYS[node.type];
- if (!keys) return;
- if (enter) enter(node, ancestors, state);
-
- for (const key of keys) {
- const subNode = node[key];
-
- if (Array.isArray(subNode)) {
- for (let i = 0; i < subNode.length; i++) {
- const child = subNode[i];
- if (!child) continue;
- ancestors.push({
- node,
- key,
- index: i
- });
- traverseSimpleImpl(child, enter, exit, state, ancestors);
- ancestors.pop();
- }
- } else if (subNode) {
- ancestors.push({
- node,
- key
- });
- traverseSimpleImpl(subNode, enter, exit, state, ancestors);
- ancestors.pop();
- }
- }
-
- if (exit) exit(node, ancestors, state);
- }
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