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// SPDX-License-Identifier: MIT OR LGPL-2.0-or-later
// SPDX-FileCopyrightText: 2021 Evan Welsh <contact@evanwelsh.com>
import {getEncodingFromLabel} from './encodingMap.js';
class TextDecoder {
/**
* @type {string}
*/
encoding;
/**
* @type {boolean}
*/
ignoreBOM;
/**
* @type {boolean}
*/
fatal;
/**
* @private
* @type {string}
*/
_internalEncoding;
get [Symbol.toStringTag]() {
return 'TextDecoder';
}
/**
* @param {string} encoding The encoding to decode into
* @param {object} [options] Decoding options
* @param {boolean=} options.fatal Whether to throw or substitute when invalid characters are encountered
* @param {boolean=} options.ignoreBOM Whether to ignore the byte order for UTF-8 arrays
*/
constructor(encoding = 'utf-8', options = {}) {
const {fatal = false, ignoreBOM = false} = options;
const encodingDefinition = getEncodingFromLabel(`${encoding}`);
if (!encodingDefinition)
throw new RangeError(`Invalid encoding label: '${encoding}'`);
if (encodingDefinition.label === 'replacement') {
throw new RangeError(
`Unsupported replacement encoding: '${encoding}'`
);
}
Object.defineProperty(this, '_internalEncoding', {
value: encodingDefinition.internalLabel,
enumerable: false,
writable: false,
configurable: false,
});
Object.defineProperty(this, 'encoding', {
value: encodingDefinition.label,
enumerable: true,
writable: false,
configurable: false,
});
Object.defineProperty(this, 'ignoreBOM', {
value: Boolean(ignoreBOM),
enumerable: true,
writable: false,
configurable: false,
});
Object.defineProperty(this, 'fatal', {
value: Boolean(fatal),
enumerable: true,
writable: false,
configurable: false,
});
}
/**
* @param {unknown} bytes a typed array of bytes to decode
* @param {object} [options] Decoding options
* @param {boolean=} options.stream Unsupported option. Whether to stream the decoded bytes.
* @returns
*/
decode(bytes, options = {}) {
const {stream = false} = options;
if (stream) {
throw new Error(
'TextDecoder does not implement the \'stream\' option.'
);
}
/** @type {Uint8Array} */
let input;
if (bytes instanceof ArrayBuffer) {
input = new Uint8Array(bytes);
} else if (bytes instanceof Uint8Array) {
input = bytes;
} else if (ArrayBuffer.isView(bytes)) {
let {buffer, byteLength, byteOffset} = bytes;
input = new Uint8Array(buffer, byteOffset, byteLength);
} else if (bytes === undefined) {
input = new Uint8Array(0);
} else {
throw new Error(
'Provided input cannot be converted to ArrayBufferView or ArrayBuffer'
);
}
if (
this.ignoreBOM &&
input.length > 2 &&
input[0] === 0xef &&
input[1] === 0xbb &&
input[2] === 0xbf
) {
if (this.encoding !== 'utf-8')
throw new Error('Cannot ignore BOM for non-UTF8 encoding.');
let {buffer, byteLength, byteOffset} = input;
input = new Uint8Array(buffer, byteOffset + 3, byteLength - 3);
}
const Encoding = import.meta.importSync('_encodingNative');
return Encoding.decode(input, this._internalEncoding, this.fatal);
}
}
class TextEncoder {
get [Symbol.toStringTag]() {
return 'TextEncoder';
}
get encoding() {
return 'utf-8';
}
encode(input = '') {
const Encoding = import.meta.importSync('_encodingNative');
// The TextEncoder specification only allows for UTF-8 encoding.
return Encoding.encode(`${input}`, 'utf-8');
}
encodeInto(input = '', output = new Uint8Array()) {
const Encoding = import.meta.importSync('_encodingNative');
// The TextEncoder specification only allows for UTF-8 encoding.
return Encoding.encodeInto(`${input}`, output);
}
}
Object.defineProperty(globalThis, 'TextEncoder', {
configurable: false,
enumerable: true,
writable: false,
value: TextEncoder,
});
Object.defineProperty(globalThis, 'TextDecoder', {
configurable: false,
enumerable: true,
writable: false,
value: TextDecoder,
});
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