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