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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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