blob: 47e48a420e00397a3596d75ba25afcfd8505f009 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
/**
* @fileoverview Rule to flag the use of empty character classes in regular expressions
* @author Ian Christian Myers
*/
"use strict";
//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------
/*
plain-English description of the following regexp:
0. `^` fix the match at the beginning of the string
1. `\/`: the `/` that begins the regexp
2. `([^\\[]|\\.|\[([^\\\]]|\\.)+\])*`: regexp contents; 0 or more of the following
2.0. `[^\\[]`: any character that's not a `\` or a `[` (anything but escape sequences and character classes)
2.1. `\\.`: an escape sequence
2.2. `\[([^\\\]]|\\.)+\]`: a character class that isn't empty
3. `\/` the `/` that ends the regexp
4. `[gimuy]*`: optional regexp flags
5. `$`: fix the match at the end of the string
*/
const regex = /^\/([^\\[]|\\.|\[([^\\\]]|\\.)+\])*\/[gimuy]*$/;
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
docs: {
description: "disallow empty character classes in regular expressions",
category: "Possible Errors",
recommended: true
},
schema: []
},
create: function(context) {
const sourceCode = context.getSourceCode();
return {
Literal: function(node) {
const token = sourceCode.getFirstToken(node);
if (token.type === "RegularExpression" && !regex.test(token.value)) {
context.report(node, "Empty class.");
}
}
};
}
};
|
