| "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); |
| } |