66 lines
1.7 KiB
JavaScript
66 lines
1.7 KiB
JavaScript
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/**
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* @author Toru Nagashima <https://github.com/mysticatea>
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* See LICENSE file in root directory for full license.
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*/
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import KEYS from "./visitor-keys.js";
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/**
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* @typedef {{ readonly [type: string]: ReadonlyArray<string> }} VisitorKeys
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*/
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// List to ignore keys.
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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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* Check whether a given key should be used or not.
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* @param {string} key The key to check.
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* @returns {boolean} `true` if the key should be used.
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*/
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function filterKey(key) {
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return !KEY_BLACKLIST.has(key) && key[0] !== "_";
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}
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/**
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* Get visitor keys of a given node.
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* @param {object} node The AST node to get keys.
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* @returns {readonly string[]} Visitor keys of the node.
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*/
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export function getKeys(node) {
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return Object.keys(node).filter(filterKey);
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}
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// Disable valid-jsdoc rule because it reports syntax error on the type of @returns.
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// eslint-disable-next-line valid-jsdoc
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/**
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* Make the union set with `KEYS` and given keys.
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* @param {VisitorKeys} additionalKeys The additional keys.
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* @returns {VisitorKeys} The union set.
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*/
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export function unionWith(additionalKeys) {
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const retv = /** @type {{
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[type: string]: ReadonlyArray<string>
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}} */ (Object.assign({}, KEYS));
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for (const type of Object.keys(additionalKeys)) {
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if (Object.prototype.hasOwnProperty.call(retv, type)) {
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const keys = new Set(additionalKeys[type]);
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for (const key of retv[type]) {
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keys.add(key);
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}
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retv[type] = Object.freeze(Array.from(keys));
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} else {
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retv[type] = Object.freeze(Array.from(additionalKeys[type]));
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}
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}
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return Object.freeze(retv);
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}
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export { KEYS };
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