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64 lines
1.9 KiB
64 lines
1.9 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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const regex = /^\/([^\\[]|\\.|\[([^\\\]]|\\.)+\])*\/[gimuys]*$/u; |
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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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type: "problem", |
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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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url: "https://eslint.org/docs/rules/no-empty-character-class" |
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}, |
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schema: [], |
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messages: { |
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unexpected: "Empty class." |
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} |
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}, |
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create(context) { |
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const sourceCode = context.getSourceCode(); |
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return { |
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Literal(node) { |
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const token = sourceCode.getFirstToken(node); |
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if (token.type === "RegularExpression" && !regex.test(token.value)) { |
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context.report({ node, messageId: "unexpected" }); |
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} |
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} |
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}; |
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} |
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};
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