73 lines
3.3 KiB
JavaScript
73 lines
3.3 KiB
JavaScript
/**
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* @license
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* Copyright 2013 Palantir Technologies, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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"use strict";
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var __extends = (this && this.__extends) || (function () {
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var extendStatics = Object.setPrototypeOf ||
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({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
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function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
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return function (d, b) {
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extendStatics(d, b);
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function __() { this.constructor = d; }
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d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
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};
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})();
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Object.defineProperty(exports, "__esModule", { value: true });
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var ts = require("typescript");
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var Lint = require("../index");
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var Rule = (function (_super) {
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__extends(Rule, _super);
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function Rule() {
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return _super !== null && _super.apply(this, arguments) || this;
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}
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Rule.prototype.apply = function (sourceFile) {
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return this.applyWithWalker(new UseIsnanRuleWalker(sourceFile, this.getOptions()));
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};
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return Rule;
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}(Lint.Rules.AbstractRule));
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/* tslint:disable:object-literal-sort-keys */
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Rule.metadata = {
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ruleName: "use-isnan",
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description: "Enforces use of the `isNaN()` function to check for NaN references instead of a comparison to the `NaN` constant.",
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rationale: (_a = ["\n Since `NaN !== NaN`, comparisons with regular operators will produce unexpected results.\n So, instead of `if (myVar === NaN)`, do `if (isNaN(myVar))`."], _a.raw = ["\n Since \\`NaN !== NaN\\`, comparisons with regular operators will produce unexpected results.\n So, instead of \\`if (myVar === NaN)\\`, do \\`if (isNaN(myVar))\\`."], Lint.Utils.dedent(_a)),
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optionsDescription: "Not configurable.",
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options: null,
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optionExamples: ["true"],
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type: "functionality",
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typescriptOnly: false,
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};
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/* tslint:enable:object-literal-sort-keys */
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Rule.FAILURE_STRING = "Found an invalid comparison for NaN: ";
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exports.Rule = Rule;
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var UseIsnanRuleWalker = (function (_super) {
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__extends(UseIsnanRuleWalker, _super);
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function UseIsnanRuleWalker() {
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return _super !== null && _super.apply(this, arguments) || this;
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}
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UseIsnanRuleWalker.prototype.visitBinaryExpression = function (node) {
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if ((this.isExpressionNaN(node.left) || this.isExpressionNaN(node.right))
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&& node.operatorToken.kind !== ts.SyntaxKind.EqualsToken) {
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this.addFailureAtNode(node, Rule.FAILURE_STRING + node.getText());
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}
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_super.prototype.visitBinaryExpression.call(this, node);
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};
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UseIsnanRuleWalker.prototype.isExpressionNaN = function (node) {
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return node.kind === ts.SyntaxKind.Identifier && node.getText() === "NaN";
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};
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return UseIsnanRuleWalker;
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}(Lint.RuleWalker));
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var _a;
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