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54 lines
1.6 KiB
TypeScript
54 lines
1.6 KiB
TypeScript
/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {
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FileDoesNotExistException,
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JsonParseMode,
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JsonValue,
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parseJson,
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} from '@angular-devkit/core';
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import { existsSync, readFileSync } from 'fs';
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/**
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* Read a file and returns its content. This supports different file encoding.
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*/
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export function readFile(fileName: string): string {
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if (!existsSync(fileName)) {
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throw new FileDoesNotExistException(fileName);
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}
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const buffer = readFileSync(fileName);
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let len = buffer.length;
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if (len >= 2 && buffer[0] === 0xfe && buffer[1] === 0xff) {
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// Big endian UTF-16 byte order mark detected. Since big endian is not supported by node.js,
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// flip all byte pairs and treat as little endian.
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len &= ~1;
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for (let i = 0; i < len; i += 2) {
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const temp = buffer[i];
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buffer[i] = buffer[i + 1];
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buffer[i + 1] = temp;
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}
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return buffer.toString('utf16le', 2);
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}
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if (len >= 2 && buffer[0] === 0xff && buffer[1] === 0xfe) {
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// Little endian UTF-16 byte order mark detected
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return buffer.toString('utf16le', 2);
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}
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if (len >= 3 && buffer[0] === 0xef && buffer[1] === 0xbb && buffer[2] === 0xbf) {
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// UTF-8 byte order mark detected
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return buffer.toString('utf8', 3);
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}
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// Default is UTF-8 with no byte order mark
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return buffer.toString('utf8');
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}
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export function readJsonFile(path: string): JsonValue {
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return parseJson(readFile(path), JsonParseMode.Loose);
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}
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