1 | /**
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2 | * @fileoverview Rule that warns when identifier names that are
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3 | * blacklisted in the configuration are used.
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4 | * @author Keith Cirkel (http://keithcirkel.co.uk)
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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 | //------------------------------------------------------------------------------
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10 | // Rule Definition
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11 | //------------------------------------------------------------------------------
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12 |
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13 | module.exports = {
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14 | meta: {
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15 | docs: {
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16 | description: "disallow specified identifiers",
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17 | category: "Stylistic Issues",
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18 | recommended: false
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19 | },
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20 |
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21 | schema: {
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22 | type: "array",
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23 | items: {
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24 | type: "string"
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25 | },
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26 | uniqueItems: true
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27 | }
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28 | },
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29 |
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30 | create(context) {
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31 |
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32 |
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33 | //--------------------------------------------------------------------------
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34 | // Helpers
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35 | //--------------------------------------------------------------------------
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36 |
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37 | const blacklist = context.options;
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38 |
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39 |
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40 | /**
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41 | * Checks if a string matches the provided pattern
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42 | * @param {string} name The string to check.
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43 | * @returns {boolean} if the string is a match
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44 | * @private
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45 | */
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46 | function isInvalid(name) {
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47 | return blacklist.indexOf(name) !== -1;
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48 | }
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49 |
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50 | /**
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51 | * Verifies if we should report an error or not based on the effective
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52 | * parent node and the identifier name.
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53 | * @param {ASTNode} effectiveParent The effective parent node of the node to be reported
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54 | * @param {string} name The identifier name of the identifier node
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55 | * @returns {boolean} whether an error should be reported or not
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56 | */
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57 | function shouldReport(effectiveParent, name) {
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58 | return effectiveParent.type !== "CallExpression" &&
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59 | effectiveParent.type !== "NewExpression" &&
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60 | isInvalid(name);
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61 | }
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62 |
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63 | /**
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64 | * Reports an AST node as a rule violation.
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65 | * @param {ASTNode} node The node to report.
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66 | * @returns {void}
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67 | * @private
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68 | */
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69 | function report(node) {
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70 | context.report({
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71 | node,
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72 | message: "Identifier '{{name}}' is blacklisted.",
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73 | data: {
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74 | name: node.name
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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 | return {
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80 |
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81 | Identifier(node) {
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82 | const name = node.name,
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83 | effectiveParent = (node.parent.type === "MemberExpression") ? node.parent.parent : node.parent;
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84 |
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85 | // MemberExpressions get special rules
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86 | if (node.parent.type === "MemberExpression") {
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87 |
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88 | // Always check object names
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89 | if (node.parent.object.type === "Identifier" &&
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90 | node.parent.object.name === node.name) {
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91 | if (isInvalid(name)) {
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92 | report(node);
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93 | }
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94 |
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95 | // Report AssignmentExpressions only if they are the left side of the assignment
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96 | } else if (effectiveParent.type === "AssignmentExpression" &&
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97 | (effectiveParent.right.type !== "MemberExpression" ||
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98 | effectiveParent.left.type === "MemberExpression" &&
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99 | effectiveParent.left.property.name === node.name)) {
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100 | if (isInvalid(name)) {
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101 | report(node);
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102 | }
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103 | }
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104 |
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105 | // Properties have their own rules
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106 | } else if (node.parent.type === "Property") {
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107 |
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108 | if (shouldReport(effectiveParent, name)) {
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109 | report(node);
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110 | }
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111 |
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112 | // Report anything that is a match and not a CallExpression
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113 | } else if (shouldReport(effectiveParent, name)) {
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114 | report(node);
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115 | }
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116 | }
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117 |
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118 | };
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119 |
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120 | }
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121 | };
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