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"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 = /** @class */ (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);
};
/* 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: ";
return Rule;
}(Lint.Rules.AbstractRule));
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;
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