diff options
Diffstat (limited to 'node_modules/tslint/lib/rules/useIsnanRule.js')
-rw-r--r-- | node_modules/tslint/lib/rules/useIsnanRule.js | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/node_modules/tslint/lib/rules/useIsnanRule.js b/node_modules/tslint/lib/rules/useIsnanRule.js new file mode 100644 index 000000000..4b7f3738a --- /dev/null +++ b/node_modules/tslint/lib/rules/useIsnanRule.js @@ -0,0 +1,70 @@ +"use strict"; +/** + * @license + * Copyright 2013 Palantir Technologies, Inc. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +Object.defineProperty(exports, "__esModule", { value: true }); +var tslib_1 = require("tslib"); +var tsutils_1 = require("tsutils"); +var ts = require("typescript"); +var Lint = require("../index"); +var Rule = (function (_super) { + tslib_1.__extends(Rule, _super); + function Rule() { + return _super !== null && _super.apply(this, arguments) || this; + } + Rule.prototype.apply = function (sourceFile) { + return this.applyWithFunction(sourceFile, walk); + }; + return Rule; +}(Lint.Rules.AbstractRule)); +/* tslint:disable:object-literal-sort-keys */ +Rule.metadata = { + ruleName: "use-isnan", + description: "Enforces use of the `isNaN()` function to check for NaN references instead of a comparison to the `NaN` constant.", + 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)), + optionsDescription: "Not configurable.", + options: null, + optionExamples: [true], + type: "functionality", + typescriptOnly: false, +}; +/* tslint:enable:object-literal-sort-keys */ +Rule.FAILURE_STRING = "Found an invalid comparison for NaN: "; +exports.Rule = Rule; +function walk(ctx) { + return ts.forEachChild(ctx.sourceFile, function cb(node) { + if (tsutils_1.isBinaryExpression(node)) { + switch (node.operatorToken.kind) { + case ts.SyntaxKind.LessThanToken: + case ts.SyntaxKind.GreaterThanToken: + case ts.SyntaxKind.LessThanEqualsToken: + case ts.SyntaxKind.GreaterThanEqualsToken: + case ts.SyntaxKind.EqualsEqualsToken: + case ts.SyntaxKind.ExclamationEqualsToken: + case ts.SyntaxKind.EqualsEqualsEqualsToken: + case ts.SyntaxKind.ExclamationEqualsEqualsToken: + if (isExpressionNaN(node.right) || isExpressionNaN(node.left)) { + ctx.addFailureAtNode(node, Rule.FAILURE_STRING + node.getText(ctx.sourceFile)); + } + } + } + return ts.forEachChild(node, cb); + }); +} +function isExpressionNaN(node) { + return node.kind === ts.SyntaxKind.Identifier && node.text === "NaN"; +} +var _a; |