d91e10b3bd
PR-URL: https://github.com/nodejs/io.js/pull/2072 Reviewed-By: Yosuke Furukawa <yosuke.furukawa@gmail.com> Reviewed-by: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Alex Kocharin <alex@kocharin.ru>
43 lines
1.4 KiB
JavaScript
43 lines
1.4 KiB
JavaScript
/**
|
|
* @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
|
|
*/
|
|
var regex = /^\/([^\\[]|\\.|\[([^\\\]]|\\.)+\])*\/[gimuy]*$/;
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Rule Definition
|
|
//------------------------------------------------------------------------------
|
|
|
|
module.exports = function(context) {
|
|
|
|
return {
|
|
|
|
"Literal": function(node) {
|
|
var token = context.getFirstToken(node);
|
|
if (token.type === "RegularExpression" && !regex.test(token.value)) {
|
|
context.report(node, "Empty class.");
|
|
}
|
|
}
|
|
|
|
};
|
|
|
|
};
|