73 lines
2.1 KiB
JavaScript
73 lines
2.1 KiB
JavaScript
|
/**
|
||
|
|
* @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
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
module.exports = {
|
||
|
|
meta: {
|
||
|
|
type: "suggestion",
|
||
|
|
|
||
|
|
docs: {
|
||
|
|
description: "disallow labels that share a name with a variable",
|
||
|
|
category: "Variables",
|
||
|
|
recommended: false,
|
||
|
|
url: "https://eslint.org/docs/rules/no-label-var"
|
||
|
|
},
|
||
|
|
|
||
|
|
schema: []
|
||
|
|
},
|
||
|
|
|
||
|
|
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, message: "Found identifier with same name as label." });
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
}
|
||
|
|
};
|