1 | /**
|
2 | * @fileoverview Rule to flag labels that are the same as an identifier
|
3 | * @author Ian Christian Myers
|
4 | */
|
5 |
|
6 | ;
|
7 |
|
8 | //------------------------------------------------------------------------------
|
9 | // Requirements
|
10 | //------------------------------------------------------------------------------
|
11 |
|
12 | const astUtils = require("../ast-utils");
|
13 |
|
14 | //------------------------------------------------------------------------------
|
15 | // Rule Definition
|
16 | //------------------------------------------------------------------------------
|
17 |
|
18 | module.exports = {
|
19 | meta: {
|
20 | docs: {
|
21 | description: "disallow labels that share a name with a variable",
|
22 | category: "Variables",
|
23 | recommended: false,
|
24 | url: "https://eslint.org/docs/rules/no-label-var"
|
25 | },
|
26 |
|
27 | schema: []
|
28 | },
|
29 |
|
30 | create(context) {
|
31 |
|
32 | //--------------------------------------------------------------------------
|
33 | // Helpers
|
34 | //--------------------------------------------------------------------------
|
35 |
|
36 | /**
|
37 | * Check if the identifier is present inside current scope
|
38 | * @param {Object} scope current scope
|
39 | * @param {string} name To evaluate
|
40 | * @returns {boolean} True if its present
|
41 | * @private
|
42 | */
|
43 | function findIdentifier(scope, name) {
|
44 | return astUtils.getVariableByName(scope, name) !== null;
|
45 | }
|
46 |
|
47 | //--------------------------------------------------------------------------
|
48 | // Public API
|
49 | //--------------------------------------------------------------------------
|
50 |
|
51 | return {
|
52 |
|
53 | LabeledStatement(node) {
|
54 |
|
55 | // Fetch the innermost scope.
|
56 | const scope = context.getScope();
|
57 |
|
58 | /*
|
59 | * Recursively find the identifier walking up the scope, starting
|
60 | * with the innermost scope.
|
61 | */
|
62 | if (findIdentifier(scope, node.label.name)) {
|
63 | context.report({ node, message: "Found identifier with same name as label." });
|
64 | }
|
65 | }
|
66 |
|
67 | };
|
68 |
|
69 | }
|
70 | };
|