4 * Copyright 2017 Palantir Technologies, Inc.
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
18 Object.defineProperty(exports, "__esModule", { value: true });
19 var tslib_1 = require("tslib");
20 var fs = require("fs");
21 var Lint = require("../index");
22 var utils_1 = require("../utils");
23 var Rule = /** @class */ (function (_super) {
24 tslib_1.__extends(Rule, _super);
26 return _super !== null && _super.apply(this, arguments) || this;
28 /* tslint:enable:object-literal-sort-keys */
29 Rule.FAILURE_STRING = function (actual) {
30 return "This file is encoded as " + showEncoding(actual) + " instead of UTF-8.";
32 Rule.prototype.apply = function (sourceFile) {
33 return this.applyWithFunction(sourceFile, walk);
35 /* tslint:disable:object-literal-sort-keys */
38 description: "Enforces UTF-8 file encoding.",
39 optionsDescription: "Not configurable.",
41 optionExamples: ["true"],
43 typescriptOnly: false,
46 }(Lint.Rules.AbstractRule));
49 var encoding = detectEncoding(ctx.sourceFile.fileName);
50 if (encoding !== "utf8") {
51 ctx.addFailure(0, 1, Rule.FAILURE_STRING(encoding));
54 function showEncoding(encoding) {
59 return "UTF-8 with byte-order marker (BOM)";
61 return "UTF-16 (little-endian)";
63 return "UTF-16 (big-endian)";
66 function detectEncoding(fileName) {
67 var fd = fs.openSync(fileName, "r");
68 var maxBytesRead = 3; // Only need 3 bytes to detect the encoding.
69 var buffer = Buffer.allocUnsafe(maxBytesRead);
70 var bytesRead = fs.readSync(fd, buffer,
72 /*length*/ maxBytesRead,
75 return utils_1.detectBufferEncoding(buffer, bytesRead);