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codeql-action/node_modules/eslint/lib/rules/default-case.js
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/** | |
* @fileoverview require default case in switch statements | |
* @author Aliaksei Shytkin | |
*/ | |
"use strict"; | |
const DEFAULT_COMMENT_PATTERN = /^no default$/iu; | |
//------------------------------------------------------------------------------ | |
// Rule Definition | |
//------------------------------------------------------------------------------ | |
/** @type {import('../shared/types').Rule} */ | |
module.exports = { | |
meta: { | |
type: "suggestion", | |
docs: { | |
description: "Require `default` cases in `switch` statements", | |
recommended: false, | |
url: "https://eslint.org/docs/latest/rules/default-case" | |
}, | |
schema: [{ | |
type: "object", | |
properties: { | |
commentPattern: { | |
type: "string" | |
} | |
}, | |
additionalProperties: false | |
}], | |
messages: { | |
missingDefaultCase: "Expected a default case." | |
} | |
}, | |
create(context) { | |
const options = context.options[0] || {}; | |
const commentPattern = options.commentPattern | |
? new RegExp(options.commentPattern, "u") | |
: DEFAULT_COMMENT_PATTERN; | |
const sourceCode = context.sourceCode; | |
//-------------------------------------------------------------------------- | |
// Helpers | |
//-------------------------------------------------------------------------- | |
/** | |
* Shortcut to get last element of array | |
* @param {*[]} collection Array | |
* @returns {any} Last element | |
*/ | |
function last(collection) { | |
return collection[collection.length - 1]; | |
} | |
//-------------------------------------------------------------------------- | |
// Public | |
//-------------------------------------------------------------------------- | |
return { | |
SwitchStatement(node) { | |
if (!node.cases.length) { | |
/* | |
* skip check of empty switch because there is no easy way | |
* to extract comments inside it now | |
*/ | |
return; | |
} | |
const hasDefault = node.cases.some(v => v.test === null); | |
if (!hasDefault) { | |
let comment; | |
const lastCase = last(node.cases); | |
const comments = sourceCode.getCommentsAfter(lastCase); | |
if (comments.length) { | |
comment = last(comments); | |
} | |
if (!comment || !commentPattern.test(comment.value.trim())) { | |
context.report({ node, messageId: "missingDefaultCase" }); | |
} | |
} | |
} | |
}; | |
} | |
}; |