1 | /**
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2 | * @fileoverview Rule to flag labels that are the same as an identifier
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3 | * @author Ian Christian Myers
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4 | */
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5 |
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6 | ;
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7 |
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8 | //------------------------------------------------------------------------------
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9 | // Requirements
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10 | //------------------------------------------------------------------------------
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11 |
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12 | const astUtils = require("./utils/ast-utils");
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13 |
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14 | //------------------------------------------------------------------------------
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15 | // Rule Definition
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16 | //------------------------------------------------------------------------------
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17 |
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18 | module.exports = {
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19 | meta: {
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20 | type: "suggestion",
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21 |
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22 | docs: {
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23 | description: "disallow labels that share a name with a variable",
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24 | category: "Variables",
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25 | recommended: false,
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26 | url: "https://eslint.org/docs/rules/no-label-var"
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27 | },
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28 |
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29 | schema: [],
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30 |
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31 | messages: {
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32 | identifierClashWithLabel: "Found identifier with same name as label."
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33 | }
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34 | },
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35 |
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36 | create(context) {
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37 |
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38 | //--------------------------------------------------------------------------
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39 | // Helpers
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40 | //--------------------------------------------------------------------------
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41 |
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42 | /**
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43 | * Check if the identifier is present inside current scope
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44 | * @param {Object} scope current scope
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45 | * @param {string} name To evaluate
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46 | * @returns {boolean} True if its present
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47 | * @private
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48 | */
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49 | function findIdentifier(scope, name) {
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50 | return astUtils.getVariableByName(scope, name) !== null;
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51 | }
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52 |
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53 | //--------------------------------------------------------------------------
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54 | // Public API
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55 | //--------------------------------------------------------------------------
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56 |
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57 | return {
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58 |
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59 | LabeledStatement(node) {
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60 |
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61 | // Fetch the innermost scope.
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62 | const scope = context.getScope();
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63 |
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64 | /*
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65 | * Recursively find the identifier walking up the scope, starting
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66 | * with the innermost scope.
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67 | */
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68 | if (findIdentifier(scope, node.label.name)) {
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69 | context.report({
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70 | node,
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71 | messageId: "identifierClashWithLabel"
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72 | });
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73 | }
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74 | }
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75 |
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76 | };
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77 |
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78 | }
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79 | };
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