46 lines
1.2 KiB
JavaScript
46 lines
1.2 KiB
JavaScript
/**
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* @fileoverview Wrapper around estraverse
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* @author Nicholas C. Zakas
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const estraverse = require("estraverse");
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//------------------------------------------------------------------------------
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// Helpers
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//------------------------------------------------------------------------------
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const KEY_BLACKLIST = new Set([
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"parent",
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"leadingComments",
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"trailingComments"
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]);
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/**
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* Wrapper around an estraverse controller that ensures the correct keys
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* are visited.
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* @constructor
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*/
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class Traverser extends estraverse.Controller {
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traverse(node, visitor) {
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visitor.fallback = Traverser.getKeys;
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return super.traverse(node, visitor);
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}
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/**
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* Calculates the keys to use for traversal.
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* @param {ASTNode} node The node to read keys from.
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* @returns {string[]} An array of keys to visit on the node.
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* @private
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*/
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static getKeys(node) {
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return Object.keys(node).filter(key => !KEY_BLACKLIST.has(key));
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}
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}
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module.exports = Traverser;
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