| /** |
| * @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." }); |
| } |
| } |
| |
| }; |
| |
| } |
| }; |