You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
79 lines
2.3 KiB
79 lines
2.3 KiB
/** |
|
* @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/rules/no-label-var" |
|
}, |
|
|
|
schema: [], |
|
|
|
messages: { |
|
identifierClashWithLabel: "Found identifier with same name as label." |
|
} |
|
}, |
|
|
|
create(context) { |
|
|
|
//-------------------------------------------------------------------------- |
|
// 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 = context.getScope(); |
|
|
|
/* |
|
* Recursively find the identifier walking up the scope, starting |
|
* with the innermost scope. |
|
*/ |
|
if (findIdentifier(scope, node.label.name)) { |
|
context.report({ |
|
node, |
|
messageId: "identifierClashWithLabel" |
|
}); |
|
} |
|
} |
|
|
|
}; |
|
|
|
} |
|
};
|
|
|