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codeql-action/node_modules/eslint/lib/rules/no-empty-character-class.js
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/** | |
* @fileoverview Rule to flag the use of empty character classes in regular expressions | |
* @author Ian Christian Myers | |
*/ | |
"use strict"; | |
//------------------------------------------------------------------------------ | |
// Requirements | |
//------------------------------------------------------------------------------ | |
const { RegExpParser, visitRegExpAST } = require("@eslint-community/regexpp"); | |
//------------------------------------------------------------------------------ | |
// Helpers | |
//------------------------------------------------------------------------------ | |
const parser = new RegExpParser(); | |
const QUICK_TEST_REGEX = /\[\]/u; | |
//------------------------------------------------------------------------------ | |
// Rule Definition | |
//------------------------------------------------------------------------------ | |
/** @type {import('../shared/types').Rule} */ | |
module.exports = { | |
meta: { | |
type: "problem", | |
docs: { | |
description: "Disallow empty character classes in regular expressions", | |
recommended: true, | |
url: "https://eslint.org/docs/latest/rules/no-empty-character-class" | |
}, | |
schema: [], | |
messages: { | |
unexpected: "Empty class." | |
} | |
}, | |
create(context) { | |
return { | |
"Literal[regex]"(node) { | |
const { pattern, flags } = node.regex; | |
if (!QUICK_TEST_REGEX.test(pattern)) { | |
return; | |
} | |
let regExpAST; | |
try { | |
regExpAST = parser.parsePattern(pattern, 0, pattern.length, { | |
unicode: flags.includes("u"), | |
unicodeSets: flags.includes("v") | |
}); | |
} catch { | |
// Ignore regular expressions that regexpp cannot parse | |
return; | |
} | |
visitRegExpAST(regExpAST, { | |
onCharacterClassEnter(characterClass) { | |
if (!characterClass.negate && characterClass.elements.length === 0) { | |
context.report({ node, messageId: "unexpected" }); | |
} | |
} | |
}); | |
} | |
}; | |
} | |
}; |