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108 lines
3.5 KiB
108 lines
3.5 KiB
3 years ago
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const Stream = require('./'); const { DEFAULT_ENCODING, getEncoding } = Stream;
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const { end_of_stream, finished, stringToCodePoints } = require('../utils');
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const { encoders } = require('../table');
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// 8.2 Interface TextEncoder
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class TextEncoder {
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/**
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* @param {string=} label The label of the encoding. NONSTANDARD.
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* @param {Object=} [options] NONSTANDARD.
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*/
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constructor(label, options = {}) {
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// A TextEncoder object has an associated encoding and encoder.
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/** @private */
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this._encoding = null
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/** @private @type {?Encoder} */
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this._encoder = null
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// Non-standard
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/** @private @type {boolean} */
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this._do_not_flush = false
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/** @private @type {string} */
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this._fatal = options['fatal'] ? 'fatal' : 'replacement'
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// 2. Set enc's encoding to UTF-8's encoder.
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if (options['NONSTANDARD_allowLegacyEncoding']) {
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// NONSTANDARD behavior.
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label = label !== undefined ? String(label) : DEFAULT_ENCODING
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var encoding = getEncoding(label)
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if (encoding === null || encoding.name === 'replacement')
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throw RangeError('Unknown encoding: ' + label)
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if (!encoders[encoding.name]) {
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throw Error('Encoder not present.' +
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' Did you forget to include encoding-indexes.js first?')
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}
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this._encoding = encoding
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} else {
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// Standard behavior.
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this._encoding = getEncoding('utf-8')
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if (label !== undefined && 'console' in global) {
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console.warn('TextEncoder constructor called with encoding label, '
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+ 'which is ignored.')
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}
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}
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}
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get encoding() {
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return this._encoding.name.toLowerCase()
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}
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/**
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* @param {string=} opt_string The string to encode.
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* @param {Object=} options
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*/
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encode(opt_string = '', options = {}) {
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// NOTE: This option is nonstandard. None of the encodings
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// permitted for encoding (i.e. UTF-8, UTF-16) are stateful when
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// the input is a USVString so streaming is not necessary.
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if (!this._do_not_flush)
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this._encoder = encoders[this._encoding.name]({
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fatal: this._fatal === 'fatal' })
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this._do_not_flush = Boolean(options['stream'])
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// 1. Convert input to a stream.
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const input = new Stream(stringToCodePoints(opt_string))
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// 2. Let output be a new stream
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const output = []
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/** @type {?(number|!Array.<number>)} */
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var result
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// 3. While true, run these substeps:
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while (true) {
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// 1. Let token be the result of reading from input.
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var token = input.read()
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if (token === end_of_stream)
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break
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// 2. Let result be the result of processing token for encoder,
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// input, output.
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result = this._encoder.handler(input, token)
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if (result === finished)
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break
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if (Array.isArray(result))
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output.push.apply(output, /**@type {!Array.<number>}*/(result))
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else
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output.push(result)
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}
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// TODO: Align with spec algorithm.
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if (!this._do_not_flush) {
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while (true) {
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result = this._encoder.handler(input, input.read())
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if (result === finished)
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break
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if (Array.isArray(result))
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output.push.apply(output, /**@type {!Array.<number>}*/(result))
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else
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output.push(result)
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}
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this._encoder = null
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}
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// 3. If result is finished, convert output into a byte sequence,
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// and then return a Uint8Array object wrapping an ArrayBuffer
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// containing output.
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return new Uint8Array(output)
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}
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}
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module.exports = TextEncoder
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