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/** * @fileoverview Rule to forbid control characters from regular expressions. * @author Nicholas C. Zakas */ "use strict"; const RegExpValidator = require("@eslint-community/regexpp").RegExpValidator; const collector = new (class { constructor() { this._source = ""; this._controlChars = []; this._validator = new RegExpValidator(this); } onPatternEnter() { /* * `RegExpValidator` may parse the pattern twice in one `validatePattern`. * So `this._controlChars` should be cleared here as well. * * For example, the `/(?<a>\x1f)/` regex will parse the pattern twice. * This is based on the content described in Annex B. * If the regex contains a `GroupName` and the `u` flag is not used, `ParseText` will be called twice. * See https://tc39.es/ecma262/2023/multipage/additional-ecmascript-features-for-web-browsers.html#sec-parsepattern-annexb */ this._controlChars = []; } onCharacter(start, end, cp) { if (cp >= 0x00 && cp <= 0x1F && ( this._source.codePointAt(start) === cp || this._source.slice(start, end).startsWith("\\x") || this._source.slice(start, end).startsWith("\\u") ) ) { this._controlChars.push(`\\x${`0${cp.toString(16)}`.slice(-2)}`); } } collectControlChars(regexpStr, flags) { const uFlag = typeof flags === "string" && flags.includes("u"); const vFlag = typeof flags === "string" && flags.includes("v"); this._controlChars = []; this._source = regexpStr; try { this._validator.validatePattern(regexpStr, void 0, void 0, { unicode: uFlag, unicodeSets: vFlag }); // Call onCharacter hook } catch { // Ignore syntax errors in RegExp. } return this._controlChars; } })(); //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { type: "problem", docs: { description: "Disallow control characters in regular expressions", recommended: true, url: "https://eslint.org/docs/latest/rules/no-control-regex" }, schema: [], messages: { unexpected: "Unexpected control character(s) in regular expression: {{controlChars}}." } }, create(context) { /** * Get the regex expression * @param {ASTNode} node `Literal` node to evaluate * @returns {{ pattern: string, flags: string | null } | null} Regex if found (the given node is either a regex literal * or a string literal that is the pattern argument of a RegExp constructor call). Otherwise `null`. If flags cannot be determined, * the `flags` property will be `null`. * @private */ function getRegExp(node) { if (node.regex) { return node.regex; } if (typeof node.value === "string" && (node.parent.type === "NewExpression" || node.parent.type === "CallExpression") && node.parent.callee.type === "Identifier" && node.parent.callee.name === "RegExp" && node.parent.arguments[0] === node ) { const pattern = node.value; const flags = node.parent.arguments.length > 1 && node.parent.arguments[1].type === "Literal" && typeof node.parent.arguments[1].value === "string" ? node.parent.arguments[1].value : null; return { pattern, flags }; } return null; } return { Literal(node) { const regExp = getRegExp(node); if (regExp) { const { pattern, flags } = regExp; const controlCharacters = collector.collectControlChars(pattern, flags); if (controlCharacters.length > 0) { context.report({ node, messageId: "unexpected", data: { controlChars: controlCharacters.join(", ") } }); } } } }; } };