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56 lines
1.7 KiB
56 lines
1.7 KiB
/**
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* @fileoverview Rule to flag the use of empty character classes in regular expressions
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* @author Ian Christian Myers
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Helpers
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//------------------------------------------------------------------------------
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/*
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plain-English description of the following regexp:
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0. `^` fix the match at the beginning of the string
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1. `\/`: the `/` that begins the regexp
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2. `([^\\[]|\\.|\[([^\\\]]|\\.)+\])*`: regexp contents; 0 or more of the following
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2.0. `[^\\[]`: any character that's not a `\` or a `[` (anything but escape sequences and character classes)
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2.1. `\\.`: an escape sequence
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2.2. `\[([^\\\]]|\\.)+\]`: a character class that isn't empty
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3. `\/` the `/` that ends the regexp
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4. `[gimuy]*`: optional regexp flags
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5. `$`: fix the match at the end of the string
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*/
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var regex = /^\/([^\\[]|\\.|\[([^\\\]]|\\.)+\])*\/[gimuy]*$/;
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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module.exports = {
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meta: {
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docs: {
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description: "disallow empty character classes in regular expressions",
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category: "Possible Errors",
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recommended: true
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},
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schema: []
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},
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create: function(context) {
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return {
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Literal: function(node) {
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var token = context.getFirstToken(node);
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if (token.type === "RegularExpression" && !regex.test(token.value)) {
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context.report(node, "Empty class.");
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}
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}
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};
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}
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};
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