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codeql-action/node_modules/eslint/lib/rules/no-duplicate-case.js
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/** | |
* @fileoverview Rule to disallow a duplicate case label. | |
* @author Dieter Oberkofler | |
* @author Burak Yigit Kaya | |
*/ | |
"use strict"; | |
//------------------------------------------------------------------------------ | |
// Requirements | |
//------------------------------------------------------------------------------ | |
const astUtils = require("./utils/ast-utils"); | |
//------------------------------------------------------------------------------ | |
// Rule Definition | |
//------------------------------------------------------------------------------ | |
/** @type {import('../shared/types').Rule} */ | |
module.exports = { | |
meta: { | |
type: "problem", | |
docs: { | |
description: "Disallow duplicate case labels", | |
recommended: true, | |
url: "https://eslint.org/docs/latest/rules/no-duplicate-case" | |
}, | |
schema: [], | |
messages: { | |
unexpected: "Duplicate case label." | |
} | |
}, | |
create(context) { | |
const sourceCode = context.sourceCode; | |
/** | |
* Determines whether the two given nodes are considered to be equal. | |
* @param {ASTNode} a First node. | |
* @param {ASTNode} b Second node. | |
* @returns {boolean} `true` if the nodes are considered to be equal. | |
*/ | |
function equal(a, b) { | |
if (a.type !== b.type) { | |
return false; | |
} | |
return astUtils.equalTokens(a, b, sourceCode); | |
} | |
return { | |
SwitchStatement(node) { | |
const previousTests = []; | |
for (const switchCase of node.cases) { | |
if (switchCase.test) { | |
const test = switchCase.test; | |
if (previousTests.some(previousTest => equal(previousTest, test))) { | |
context.report({ node: switchCase, messageId: "unexpected" }); | |
} else { | |
previousTests.push(test); | |
} | |
} | |
} | |
} | |
}; | |
} | |
}; |