mirror of
https://github.com/denoland/deno.git
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442 lines
12 KiB
JavaScript
442 lines
12 KiB
JavaScript
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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// @ts-check
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/// <reference path="../../core/lib.deno_core.d.ts" />
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/// <reference path="../../core/internal.d.ts" />
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/// <reference path="../webidl/internal.d.ts" />
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/// <reference path="../fetch/lib.deno_fetch.d.ts" />
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/// <reference path="../web/internal.d.ts" />
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/// <reference path="../web/lib.deno_web.d.ts" />
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/// <reference lib="esnext" />
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const core = globalThis.Deno.core;
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const ops = core.ops;
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import * as webidl from "internal:deno_webidl/00_webidl.js";
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const primordials = globalThis.__bootstrap.primordials;
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const {
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PromiseReject,
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PromiseResolve,
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// TODO(lucacasonato): add SharedArrayBuffer to primordials
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// SharedArrayBufferPrototype
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StringPrototypeCharCodeAt,
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StringPrototypeSlice,
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TypedArrayPrototypeSubarray,
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Uint8Array,
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ObjectPrototypeIsPrototypeOf,
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ArrayBufferIsView,
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Uint32Array,
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} = primordials;
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class TextDecoder {
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/** @type {string} */
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#encoding;
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/** @type {boolean} */
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#fatal;
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/** @type {boolean} */
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#ignoreBOM;
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/** @type {boolean} */
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#utf8SinglePass;
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/** @type {number | null} */
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#rid = null;
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/**
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* @param {string} label
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* @param {TextDecoderOptions} options
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*/
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constructor(label = "utf-8", options = {}) {
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const prefix = "Failed to construct 'TextDecoder'";
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label = webidl.converters.DOMString(label, {
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prefix,
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context: "Argument 1",
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});
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options = webidl.converters.TextDecoderOptions(options, {
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prefix,
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context: "Argument 2",
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});
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const encoding = ops.op_encoding_normalize_label(label);
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this.#encoding = encoding;
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this.#fatal = options.fatal;
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this.#ignoreBOM = options.ignoreBOM;
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this.#utf8SinglePass = encoding === "utf-8" && !options.fatal;
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this[webidl.brand] = webidl.brand;
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}
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/** @returns {string} */
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get encoding() {
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webidl.assertBranded(this, TextDecoderPrototype);
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return this.#encoding;
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}
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/** @returns {boolean} */
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get fatal() {
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webidl.assertBranded(this, TextDecoderPrototype);
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return this.#fatal;
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}
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/** @returns {boolean} */
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get ignoreBOM() {
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webidl.assertBranded(this, TextDecoderPrototype);
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return this.#ignoreBOM;
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}
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/**
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* @param {BufferSource} [input]
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* @param {TextDecodeOptions} options
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*/
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decode(input = new Uint8Array(), options = undefined) {
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webidl.assertBranded(this, TextDecoderPrototype);
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const prefix = "Failed to execute 'decode' on 'TextDecoder'";
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if (input !== undefined) {
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input = webidl.converters.BufferSource(input, {
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prefix,
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context: "Argument 1",
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allowShared: true,
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});
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}
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let stream = false;
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if (options !== undefined) {
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options = webidl.converters.TextDecodeOptions(options, {
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prefix,
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context: "Argument 2",
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});
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stream = options.stream;
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}
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try {
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// Note from spec: implementations are strongly encouraged to use an implementation strategy that avoids this copy.
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// When doing so they will have to make sure that changes to input do not affect future calls to decode().
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if (
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ObjectPrototypeIsPrototypeOf(
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// deno-lint-ignore prefer-primordials
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SharedArrayBuffer.prototype,
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input || input.buffer,
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)
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) {
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// We clone the data into a non-shared ArrayBuffer so we can pass it
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// to Rust.
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// `input` is now a Uint8Array, and calling the TypedArray constructor
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// with a TypedArray argument copies the data.
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if (ArrayBufferIsView(input)) {
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input = new Uint8Array(
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input.buffer,
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input.byteOffset,
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input.byteLength,
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);
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} else {
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input = new Uint8Array(input);
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}
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}
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// Fast path for single pass encoding.
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if (!stream && this.#rid === null) {
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// Fast path for utf8 single pass encoding.
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if (this.#utf8SinglePass) {
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return ops.op_encoding_decode_utf8(input, this.#ignoreBOM);
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}
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return ops.op_encoding_decode_single(
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input,
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this.#encoding,
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this.#fatal,
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this.#ignoreBOM,
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);
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}
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if (this.#rid === null) {
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this.#rid = ops.op_encoding_new_decoder(
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this.#encoding,
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this.#fatal,
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this.#ignoreBOM,
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);
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}
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return ops.op_encoding_decode(input, this.#rid, stream);
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} finally {
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if (!stream && this.#rid !== null) {
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core.close(this.#rid);
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this.#rid = null;
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}
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}
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}
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}
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webidl.configurePrototype(TextDecoder);
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const TextDecoderPrototype = TextDecoder.prototype;
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class TextEncoder {
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constructor() {
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this[webidl.brand] = webidl.brand;
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}
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/** @returns {string} */
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get encoding() {
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webidl.assertBranded(this, TextEncoderPrototype);
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return "utf-8";
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}
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/**
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* @param {string} input
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* @returns {Uint8Array}
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*/
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encode(input = "") {
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webidl.assertBranded(this, TextEncoderPrototype);
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const prefix = "Failed to execute 'encode' on 'TextEncoder'";
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// The WebIDL type of `input` is `USVString`, but `core.encode` already
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// converts lone surrogates to the replacement character.
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input = webidl.converters.DOMString(input, {
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prefix,
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context: "Argument 1",
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});
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return core.encode(input);
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}
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/**
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* @param {string} source
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* @param {Uint8Array} destination
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* @returns {TextEncoderEncodeIntoResult}
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*/
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encodeInto(source, destination) {
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webidl.assertBranded(this, TextEncoderPrototype);
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const prefix = "Failed to execute 'encodeInto' on 'TextEncoder'";
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// The WebIDL type of `source` is `USVString`, but the ops bindings
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// already convert lone surrogates to the replacement character.
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source = webidl.converters.DOMString(source, {
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prefix,
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context: "Argument 1",
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});
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destination = webidl.converters.Uint8Array(destination, {
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prefix,
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context: "Argument 2",
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allowShared: true,
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});
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ops.op_encoding_encode_into(source, destination, encodeIntoBuf);
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return {
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read: encodeIntoBuf[0],
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written: encodeIntoBuf[1],
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};
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}
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}
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const encodeIntoBuf = new Uint32Array(2);
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webidl.configurePrototype(TextEncoder);
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const TextEncoderPrototype = TextEncoder.prototype;
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class TextDecoderStream {
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/** @type {TextDecoder} */
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#decoder;
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/** @type {TransformStream<BufferSource, string>} */
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#transform;
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/**
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* @param {string} label
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* @param {TextDecoderOptions} options
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*/
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constructor(label = "utf-8", options = {}) {
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const prefix = "Failed to construct 'TextDecoderStream'";
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label = webidl.converters.DOMString(label, {
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prefix,
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context: "Argument 1",
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});
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options = webidl.converters.TextDecoderOptions(options, {
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prefix,
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context: "Argument 2",
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});
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this.#decoder = new TextDecoder(label, options);
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this.#transform = new TransformStream({
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// The transform and flush functions need access to TextDecoderStream's
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// `this`, so they are defined as functions rather than methods.
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transform: (chunk, controller) => {
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try {
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chunk = webidl.converters.BufferSource(chunk, {
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allowShared: true,
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});
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const decoded = this.#decoder.decode(chunk, { stream: true });
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if (decoded) {
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controller.enqueue(decoded);
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}
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return PromiseResolve();
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} catch (err) {
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return PromiseReject(err);
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}
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},
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flush: (controller) => {
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try {
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const final = this.#decoder.decode();
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if (final) {
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controller.enqueue(final);
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}
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return PromiseResolve();
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} catch (err) {
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return PromiseReject(err);
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}
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},
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});
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this[webidl.brand] = webidl.brand;
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}
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/** @returns {string} */
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get encoding() {
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webidl.assertBranded(this, TextDecoderStreamPrototype);
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return this.#decoder.encoding;
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}
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/** @returns {boolean} */
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get fatal() {
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webidl.assertBranded(this, TextDecoderStreamPrototype);
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return this.#decoder.fatal;
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}
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/** @returns {boolean} */
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get ignoreBOM() {
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webidl.assertBranded(this, TextDecoderStreamPrototype);
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return this.#decoder.ignoreBOM;
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}
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/** @returns {ReadableStream<string>} */
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get readable() {
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webidl.assertBranded(this, TextDecoderStreamPrototype);
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return this.#transform.readable;
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}
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/** @returns {WritableStream<BufferSource>} */
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get writable() {
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webidl.assertBranded(this, TextDecoderStreamPrototype);
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return this.#transform.writable;
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}
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}
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webidl.configurePrototype(TextDecoderStream);
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const TextDecoderStreamPrototype = TextDecoderStream.prototype;
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class TextEncoderStream {
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/** @type {string | null} */
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#pendingHighSurrogate = null;
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/** @type {TransformStream<string, Uint8Array>} */
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#transform;
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constructor() {
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this.#transform = new TransformStream({
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// The transform and flush functions need access to TextEncoderStream's
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// `this`, so they are defined as functions rather than methods.
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transform: (chunk, controller) => {
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try {
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chunk = webidl.converters.DOMString(chunk);
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if (chunk === "") {
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return PromiseResolve();
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}
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if (this.#pendingHighSurrogate !== null) {
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chunk = this.#pendingHighSurrogate + chunk;
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}
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const lastCodeUnit = StringPrototypeCharCodeAt(
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chunk,
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chunk.length - 1,
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);
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if (0xD800 <= lastCodeUnit && lastCodeUnit <= 0xDBFF) {
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this.#pendingHighSurrogate = StringPrototypeSlice(chunk, -1);
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chunk = StringPrototypeSlice(chunk, 0, -1);
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} else {
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this.#pendingHighSurrogate = null;
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}
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if (chunk) {
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controller.enqueue(core.encode(chunk));
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}
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return PromiseResolve();
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} catch (err) {
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return PromiseReject(err);
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}
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},
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flush: (controller) => {
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try {
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if (this.#pendingHighSurrogate !== null) {
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controller.enqueue(new Uint8Array([0xEF, 0xBF, 0xBD]));
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}
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return PromiseResolve();
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} catch (err) {
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return PromiseReject(err);
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}
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},
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});
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this[webidl.brand] = webidl.brand;
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}
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/** @returns {string} */
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get encoding() {
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webidl.assertBranded(this, TextEncoderStreamPrototype);
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return "utf-8";
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}
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/** @returns {ReadableStream<Uint8Array>} */
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get readable() {
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webidl.assertBranded(this, TextEncoderStreamPrototype);
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return this.#transform.readable;
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}
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/** @returns {WritableStream<string>} */
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get writable() {
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webidl.assertBranded(this, TextEncoderStreamPrototype);
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return this.#transform.writable;
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}
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}
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webidl.configurePrototype(TextEncoderStream);
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const TextEncoderStreamPrototype = TextEncoderStream.prototype;
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webidl.converters.TextDecoderOptions = webidl.createDictionaryConverter(
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"TextDecoderOptions",
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[
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{
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key: "fatal",
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converter: webidl.converters.boolean,
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defaultValue: false,
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},
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{
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key: "ignoreBOM",
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converter: webidl.converters.boolean,
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defaultValue: false,
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},
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],
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);
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webidl.converters.TextDecodeOptions = webidl.createDictionaryConverter(
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"TextDecodeOptions",
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[
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{
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key: "stream",
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converter: webidl.converters.boolean,
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defaultValue: false,
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},
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],
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);
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/**
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* @param {Uint8Array} bytes
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*/
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function decode(bytes, encoding) {
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const BOMEncoding = BOMSniff(bytes);
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if (BOMEncoding !== null) {
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encoding = BOMEncoding;
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const start = BOMEncoding === "UTF-8" ? 3 : 2;
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bytes = TypedArrayPrototypeSubarray(bytes, start);
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}
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return new TextDecoder(encoding).decode(bytes);
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}
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/**
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* @param {Uint8Array} bytes
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*/
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function BOMSniff(bytes) {
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if (bytes[0] === 0xEF && bytes[1] === 0xBB && bytes[2] === 0xBF) {
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return "UTF-8";
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}
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if (bytes[0] === 0xFE && bytes[1] === 0xFF) return "UTF-16BE";
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if (bytes[0] === 0xFF && bytes[1] === 0xFE) return "UTF-16LE";
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return null;
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}
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export {
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decode,
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TextDecoder,
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TextDecoderStream,
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TextEncoder,
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TextEncoderStream,
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};
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