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codeql-action/node_modules/eslint/lib/rules/no-control-regex.js
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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(", ") | |
} | |
}); | |
} | |
} | |
} | |
}; | |
} | |
}; |