]>
git.proxmox.com Git - pve-eslint.git/blob - eslint/lib/rules/no-empty-character-class.js
2 * @fileoverview Rule to flag the use of empty character classes in regular expressions
3 * @author Ian Christian Myers
8 //------------------------------------------------------------------------------
10 //------------------------------------------------------------------------------
13 * plain-English description of the following regexp:
14 * 0. `^` fix the match at the beginning of the string
15 * 1. `([^\\[]|\\.|\[([^\\\]]|\\.)+\])*`: regexp contents; 0 or more of the following
16 * 1.0. `[^\\[]`: any character that's not a `\` or a `[` (anything but escape sequences and character classes)
17 * 1.1. `\\.`: an escape sequence
18 * 1.2. `\[([^\\\]]|\\.)+\]`: a character class that isn't empty
19 * 2. `$`: fix the match at the end of the string
21 const regex
= /^([^\\[]|\\.|\[([^\\\]]|\\.)+\])*$/u;
23 //------------------------------------------------------------------------------
25 //------------------------------------------------------------------------------
27 /** @type {import('../shared/types').Rule} */
33 description
: "disallow empty character classes in regular expressions",
35 url
: "https://eslint.org/docs/rules/no-empty-character-class"
41 unexpected
: "Empty class."
47 "Literal[regex]"(node
) {
48 if (!regex
.test(node
.regex
.pattern
)) {
49 context
.report({ node
, messageId
: "unexpected" });