892a62f4e5
To be followed by tests and `npm run build`, obviously! Reviewed-on: #1 Co-authored-by: Jack Jackson <scubbojj@gmail.com> Co-committed-by: Jack Jackson <scubbojj@gmail.com>
82 lines
2.4 KiB
JavaScript
82 lines
2.4 KiB
JavaScript
/**
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* @fileoverview Rule to flag labels that are the same as an identifier
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* @author Ian Christian Myers
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const astUtils = require("./utils/ast-utils");
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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/** @type {import('../shared/types').Rule} */
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module.exports = {
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meta: {
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type: "suggestion",
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docs: {
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description: "Disallow labels that share a name with a variable",
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recommended: false,
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frozen: true,
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url: "https://eslint.org/docs/latest/rules/no-label-var"
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},
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schema: [],
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messages: {
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identifierClashWithLabel: "Found identifier with same name as label."
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}
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},
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create(context) {
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const sourceCode = context.sourceCode;
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//--------------------------------------------------------------------------
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// Helpers
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//--------------------------------------------------------------------------
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/**
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* Check if the identifier is present inside current scope
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* @param {Object} scope current scope
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* @param {string} name To evaluate
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* @returns {boolean} True if its present
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* @private
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*/
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function findIdentifier(scope, name) {
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return astUtils.getVariableByName(scope, name) !== null;
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}
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//--------------------------------------------------------------------------
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// Public API
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//--------------------------------------------------------------------------
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return {
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LabeledStatement(node) {
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// Fetch the innermost scope.
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const scope = sourceCode.getScope(node);
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/*
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* Recursively find the identifier walking up the scope, starting
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* with the innermost scope.
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*/
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if (findIdentifier(scope, node.label.name)) {
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context.report({
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node,
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messageId: "identifierClashWithLabel"
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});
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}
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}
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};
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}
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};
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