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codeql-action/node_modules/eslint/lib/rules/no-label-var.js
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/** | |
* @fileoverview Rule to flag labels that are the same as an identifier | |
* @author Ian Christian Myers | |
*/ | |
"use strict"; | |
//------------------------------------------------------------------------------ | |
// Requirements | |
//------------------------------------------------------------------------------ | |
const astUtils = require("./utils/ast-utils"); | |
//------------------------------------------------------------------------------ | |
// Rule Definition | |
//------------------------------------------------------------------------------ | |
/** @type {import('../shared/types').Rule} */ | |
module.exports = { | |
meta: { | |
type: "suggestion", | |
docs: { | |
description: "Disallow labels that share a name with a variable", | |
recommended: false, | |
url: "https://eslint.org/docs/latest/rules/no-label-var" | |
}, | |
schema: [], | |
messages: { | |
identifierClashWithLabel: "Found identifier with same name as label." | |
} | |
}, | |
create(context) { | |
const sourceCode = context.sourceCode; | |
//-------------------------------------------------------------------------- | |
// Helpers | |
//-------------------------------------------------------------------------- | |
/** | |
* Check if the identifier is present inside current scope | |
* @param {Object} scope current scope | |
* @param {string} name To evaluate | |
* @returns {boolean} True if its present | |
* @private | |
*/ | |
function findIdentifier(scope, name) { | |
return astUtils.getVariableByName(scope, name) !== null; | |
} | |
//-------------------------------------------------------------------------- | |
// Public API | |
//-------------------------------------------------------------------------- | |
return { | |
LabeledStatement(node) { | |
// Fetch the innermost scope. | |
const scope = sourceCode.getScope(node); | |
/* | |
* Recursively find the identifier walking up the scope, starting | |
* with the innermost scope. | |
*/ | |
if (findIdentifier(scope, node.label.name)) { | |
context.report({ | |
node, | |
messageId: "identifierClashWithLabel" | |
}); | |
} | |
} | |
}; | |
} | |
}; |