+++ /dev/null
-/**
- * @author Toru Nagashima <https://github.com/mysticatea>
- * See LICENSE file in root directory for full license.
- */
-"use strict";
-
-const KEYS = require("./visitor-keys.json");
-
-// Types.
-const NODE_TYPES = Object.freeze(Object.keys(KEYS));
-
-// Freeze the keys.
-for (const type of NODE_TYPES) {
- Object.freeze(KEYS[type]);
-}
-Object.freeze(KEYS);
-
-// List to ignore keys.
-const KEY_BLACKLIST = new Set([
- "parent",
- "leadingComments",
- "trailingComments"
-]);
-
-/**
- * Check whether a given key should be used or not.
- * @param {string} key The key to check.
- * @returns {boolean} `true` if the key should be used.
- */
-function filterKey(key) {
- return !KEY_BLACKLIST.has(key) && key[0] !== "_";
-}
-
-//------------------------------------------------------------------------------
-// Public interfaces
-//------------------------------------------------------------------------------
-
-module.exports = Object.freeze({
-
- /**
- * Visitor keys.
- * @type {{ [type: string]: string[] | undefined }}
- */
- KEYS,
-
- /**
- * Get visitor keys of a given node.
- * @param {Object} node The AST node to get keys.
- * @returns {string[]} Visitor keys of the node.
- */
- getKeys(node) {
- return Object.keys(node).filter(filterKey);
- },
-
- // Disable valid-jsdoc rule because it reports syntax error on the type of @returns.
- // eslint-disable-next-line valid-jsdoc
- /**
- * Make the union set with `KEYS` and given keys.
- * @param {Object} additionalKeys The additional keys.
- * @returns {{ [type: string]: string[] | undefined }} The union set.
- */
- unionWith(additionalKeys) {
- const retv = Object.assign({}, KEYS);
-
- for (const type of Object.keys(additionalKeys)) {
- if (retv.hasOwnProperty(type)) {
- const keys = new Set(additionalKeys[type]);
-
- for (const key of retv[type]) {
- keys.add(key);
- }
-
- retv[type] = Object.freeze(Array.from(keys));
- } else {
- retv[type] = Object.freeze(Array.from(additionalKeys[type]));
- }
- }
-
- return Object.freeze(retv);
- }
-});