51 lines
1.4 KiB
JavaScript
51 lines
1.4 KiB
JavaScript
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/**
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* @fileoverview Common utils for regular expressions.
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* @author Josh Goldberg
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* @author Toru Nagashima
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*/
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"use strict";
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const { RegExpValidator } = require("@eslint-community/regexpp");
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const REGEXPP_LATEST_ECMA_VERSION = 2025;
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/**
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* Checks if the given regular expression pattern would be valid with the `u` flag.
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* @param {number} ecmaVersion ECMAScript version to parse in.
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* @param {string} pattern The regular expression pattern to verify.
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* @param {"u"|"v"} flag The type of Unicode flag
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* @returns {boolean} `true` if the pattern would be valid with the `u` flag.
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* `false` if the pattern would be invalid with the `u` flag or the configured
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* ecmaVersion doesn't support the `u` flag.
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*/
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function isValidWithUnicodeFlag(ecmaVersion, pattern, flag = "u") {
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if (flag === "u" && ecmaVersion <= 5) { // ecmaVersion <= 5 doesn't support the 'u' flag
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return false;
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}
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if (flag === "v" && ecmaVersion <= 2023) {
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return false;
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}
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const validator = new RegExpValidator({
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ecmaVersion: Math.min(ecmaVersion, REGEXPP_LATEST_ECMA_VERSION)
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});
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try {
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validator.validatePattern(pattern, void 0, void 0, flag === "u" ? {
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unicode: /* uFlag = */ true
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} : {
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unicodeSets: true
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});
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} catch {
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return false;
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}
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return true;
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}
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module.exports = {
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isValidWithUnicodeFlag,
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REGEXPP_LATEST_ECMA_VERSION
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};
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