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const {
ObjectDefineProperties,
String,
StringPrototypeCharCodeAt,
Symbol,
Uint8Array,
} = primordials;
const {
TextDecoder,
TextEncoder,
} = require('internal/encoding');
const {
TransformStream,
} = require('internal/webstreams/transformstream');
const { customInspect } = require('internal/webstreams/util');
const {
codes: {
ERR_INVALID_THIS,
},
} = require('internal/errors');
const {
customInspectSymbol: kInspect,
kEmptyObject,
kEnumerableProperty,
} = require('internal/util');
const kHandle = Symbol('kHandle');
const kTransform = Symbol('kTransform');
const kType = Symbol('kType');
const kPendingHighSurrogate = Symbol('kPendingHighSurrogate');
/**
* @typedef {import('./readablestream').ReadableStream} ReadableStream
* @typedef {import('./writablestream').WritableStream} WritableStream
*/
function isTextEncoderStream(value) {
return typeof value?.[kHandle] === 'object' &&
value?.[kType] === 'TextEncoderStream';
}
function isTextDecoderStream(value) {
return typeof value?.[kHandle] === 'object' &&
value?.[kType] === 'TextDecoderStream';
}
class TextEncoderStream {
constructor() {
this[kPendingHighSurrogate] = null;
this[kType] = 'TextEncoderStream';
this[kHandle] = new TextEncoder();
this[kTransform] = new TransformStream({
transform: (chunk, controller) => {
// https://encoding.spec.whatwg.org/#encode-and-enqueue-a-chunk
chunk = String(chunk);
let finalChunk = '';
for (let i = 0; i < chunk.length; i++) {
const item = chunk[i];
const codeUnit = StringPrototypeCharCodeAt(item, 0);
if (this[kPendingHighSurrogate] !== null) {
const highSurrogate = this[kPendingHighSurrogate];
this[kPendingHighSurrogate] = null;
if (0xDC00 <= codeUnit && codeUnit <= 0xDFFF) {
finalChunk += highSurrogate + item;
continue;
}
finalChunk += '\uFFFD';
}
if (0xD800 <= codeUnit && codeUnit <= 0xDBFF) {
this[kPendingHighSurrogate] = item;
continue;
}
if (0xDC00 <= codeUnit && codeUnit <= 0xDFFF) {
finalChunk += '\uFFFD';
continue;
}
finalChunk += item;
}
if (finalChunk) {
const value = this[kHandle].encode(finalChunk);
controller.enqueue(value);
}
},
flush: (controller) => {
// https://encoding.spec.whatwg.org/#encode-and-flush
if (this[kPendingHighSurrogate] !== null) {
controller.enqueue(new Uint8Array([0xEF, 0xBF, 0xBD]));
}
},
});
}
/**
* @readonly
* @type {string}
*/
get encoding() {
if (!isTextEncoderStream(this))
throw new ERR_INVALID_THIS('TextEncoderStream');
return this[kHandle].encoding;
}
/**
* @readonly
* @type {ReadableStream}
*/
get readable() {
if (!isTextEncoderStream(this))
throw new ERR_INVALID_THIS('TextEncoderStream');
return this[kTransform].readable;
}
/**
* @readonly
* @type {WritableStream}
*/
get writable() {
if (!isTextEncoderStream(this))
throw new ERR_INVALID_THIS('TextEncoderStream');
return this[kTransform].writable;
}
[kInspect](depth, options) {
if (!isTextEncoderStream(this))
throw new ERR_INVALID_THIS('TextEncoderStream');
return customInspect(depth, options, 'TextEncoderStream', {
encoding: this[kHandle].encoding,
readable: this[kTransform].readable,
writable: this[kTransform].writable,
});
}
}
class TextDecoderStream {
/**
* @param {string} [encoding]
* @param {{
* fatal? : boolean,
* ignoreBOM? : boolean,
* }} [options]
*/
constructor(encoding = 'utf-8', options = kEmptyObject) {
this[kType] = 'TextDecoderStream';
this[kHandle] = new TextDecoder(encoding, options);
this[kTransform] = new TransformStream({
transform: (chunk, controller) => {
const value = this[kHandle].decode(chunk, { stream: true });
if (value)
controller.enqueue(value);
},
flush: (controller) => {
const value = this[kHandle].decode();
if (value)
controller.enqueue(value);
controller.terminate();
},
});
}
/**
* @readonly
* @type {string}
*/
get encoding() {
if (!isTextDecoderStream(this))
throw new ERR_INVALID_THIS('TextDecoderStream');
return this[kHandle].encoding;
}
/**
* @readonly
* @type {boolean}
*/
get fatal() {
if (!isTextDecoderStream(this))
throw new ERR_INVALID_THIS('TextDecoderStream');
return this[kHandle].fatal;
}
/**
* @readonly
* @type {boolean}
*/
get ignoreBOM() {
if (!isTextDecoderStream(this))
throw new ERR_INVALID_THIS('TextDecoderStream');
return this[kHandle].ignoreBOM;
}
/**
* @readonly
* @type {ReadableStream}
*/
get readable() {
if (!isTextDecoderStream(this))
throw new ERR_INVALID_THIS('TextDecoderStream');
return this[kTransform].readable;
}
/**
* @readonly
* @type {WritableStream}
*/
get writable() {
if (!isTextDecoderStream(this))
throw new ERR_INVALID_THIS('TextDecoderStream');
return this[kTransform].writable;
}
[kInspect](depth, options) {
if (!isTextDecoderStream(this))
throw new ERR_INVALID_THIS('TextDecoderStream');
return customInspect(depth, options, 'TextDecoderStream', {
encoding: this[kHandle].encoding,
fatal: this[kHandle].fatal,
ignoreBOM: this[kHandle].ignoreBOM,
readable: this[kTransform].readable,
writable: this[kTransform].writable,
});
}
}
ObjectDefineProperties(TextEncoderStream.prototype, {
encoding: kEnumerableProperty,
readable: kEnumerableProperty,
writable: kEnumerableProperty,
});
ObjectDefineProperties(TextDecoderStream.prototype, {
encoding: kEnumerableProperty,
fatal: kEnumerableProperty,
ignoreBOM: kEnumerableProperty,
readable: kEnumerableProperty,
writable: kEnumerableProperty,
});
module.exports = {
TextEncoderStream,
TextDecoderStream,
};
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