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-rw-r--r--op_crates/web/21_filereader.js261
1 files changed, 0 insertions, 261 deletions
diff --git a/op_crates/web/21_filereader.js b/op_crates/web/21_filereader.js
deleted file mode 100644
index 30fff33d8..000000000
--- a/op_crates/web/21_filereader.js
+++ /dev/null
@@ -1,261 +0,0 @@
-// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
-"use strict";
-
-((window) => {
- const base64 = window.__bootstrap.base64;
-
- async function readOperation(fr, blob, readtype) {
- // Implementation from https://w3c.github.io/FileAPI/ notes
- // And body of deno blob.ts readBytes
-
- fr.aborting = false;
-
- // 1. If fr’s state is "loading", throw an InvalidStateError DOMException.
- if (fr.readyState === FileReader.LOADING) {
- throw new DOMException(
- "Invalid FileReader state.",
- "InvalidStateError",
- );
- }
- // 2. Set fr’s state to "loading".
- fr.readyState = FileReader.LOADING;
- // 3. Set fr’s result to null.
- fr.result = null;
- // 4. Set fr’s error to null.
- fr.error = null;
-
- // 5. Let stream be the result of calling get stream on blob.
- const stream /*: ReadableStream<ArrayBufferView>*/ = blob.stream();
-
- // 6. Let reader be the result of getting a reader from stream.
- const reader = stream.getReader();
-
- // 7. Let bytes be an empty byte sequence.
- //let bytes = new Uint8Array();
- const chunks /*: Uint8Array[]*/ = [];
-
- // 8. Let chunkPromise be the result of reading a chunk from stream with reader.
- let chunkPromise = reader.read();
-
- // 9. Let isFirstChunk be true.
- let isFirstChunk = true;
-
- // 10 in parallel while true
- while (!fr.aborting) {
- // 1. Wait for chunkPromise to be fulfilled or rejected.
- try {
- const chunk = await chunkPromise;
-
- // 2. If chunkPromise is fulfilled, and isFirstChunk is true, queue a task to fire a progress event called loadstart at fr.
- if (isFirstChunk) {
- queueMicrotask(() => {
- // fire a progress event for loadstart
- const ev = new ProgressEvent("loadstart", {});
- fr.dispatchEvent(ev);
- });
- }
- // 3. Set isFirstChunk to false.
- isFirstChunk = false;
-
- // 4. If chunkPromise is fulfilled with an object whose done property is false
- // and whose value property is a Uint8Array object, run these steps:
- if (!chunk.done && chunk.value instanceof Uint8Array) {
- chunks.push(chunk.value);
-
- // TODO(bartlomieju): (only) If roughly 50ms have passed since last progress
- {
- const size = chunks.reduce((p, i) => p + i.byteLength, 0);
- const ev = new ProgressEvent("progress", {
- loaded: size,
- });
- fr.dispatchEvent(ev);
- }
-
- chunkPromise = reader.read();
- } // 5 Otherwise, if chunkPromise is fulfilled with an object whose done property is true, queue a task to run the following steps and abort this algorithm:
- else if (chunk.done === true) {
- queueMicrotask(() => {
- if (fr.aborting) {
- return;
- }
-
- // 1. Set fr’s state to "done".
- fr.readyState = FileReader.DONE;
- // 2. Let result be the result of package data given bytes, type, blob’s type, and encodingName.
- const size = chunks.reduce((p, i) => p + i.byteLength, 0);
- const bytes = new Uint8Array(size);
- let offs = 0;
- for (const chunk of chunks) {
- bytes.set(chunk, offs);
- offs += chunk.byteLength;
- }
- switch (readtype.kind) {
- case "ArrayBuffer": {
- fr.result = bytes.buffer;
- break;
- }
- case "Text": {
- const decoder = new TextDecoder(readtype.encoding);
- fr.result = decoder.decode(bytes.buffer);
- break;
- }
- case "DataUrl": {
- fr.result = "data:application/octet-stream;base64," +
- base64.fromByteArray(bytes);
- break;
- }
- }
- // 4.2 Fire a progress event called load at the fr.
- {
- const ev = new ProgressEvent("load", {
- lengthComputable: true,
- loaded: size,
- total: size,
- });
- fr.dispatchEvent(ev);
- }
-
- // 5. If fr’s state is not "loading", fire a progress event called loadend at the fr.
- //Note: Event handler for the load or error events could have started another load, if that happens the loadend event for this load is not fired.
- if (fr.readyState !== FileReader.LOADING) {
- const ev = new ProgressEvent("loadend", {
- lengthComputable: true,
- loaded: size,
- total: size,
- });
- fr.dispatchEvent(ev);
- }
- });
-
- break;
- }
- } catch (err) {
- if (fr.aborting) {
- break;
- }
-
- // chunkPromise rejected
- fr.readyState = FileReader.DONE;
- fr.error = err;
-
- {
- const ev = new ProgressEvent("error", {});
- fr.dispatchEvent(ev);
- }
-
- //If fr’s state is not "loading", fire a progress event called loadend at fr.
- //Note: Event handler for the error event could have started another load, if that happens the loadend event for this load is not fired.
- if (fr.readyState !== FileReader.LOADING) {
- const ev = new ProgressEvent("loadend", {});
- fr.dispatchEvent(ev);
- }
-
- break;
- }
- }
- }
-
- class FileReader extends EventTarget {
- error = null;
- readyState = FileReader.EMPTY;
- result = null;
- aborting = false;
-
- constructor() {
- super();
- }
-
- abort() {
- // If context object's state is "empty" or if context object's state is "done" set context object's result to null and terminate this algorithm.
- if (
- this.readyState === FileReader.EMPTY ||
- this.readyState === FileReader.DONE
- ) {
- this.result = null;
- return;
- }
- // If context object's state is "loading" set context object's state to "done" and set context object's result to null.
- if (this.readyState === FileReader.LOADING) {
- this.readyState = FileReader.DONE;
- this.result = null;
- }
- // If there are any tasks from the context object on the file reading task source in an affiliated task queue, then remove those tasks from that task queue.
- // Terminate the algorithm for the read method being processed.
- this.aborting = true;
-
- // Fire a progress event called abort at the context object.
- const ev = new ProgressEvent("abort", {});
- this.dispatchEvent(ev);
-
- // If context object's state is not "loading", fire a progress event called loadend at the context object.
- if (this.readyState !== FileReader.LOADING) {
- const ev = new ProgressEvent("loadend", {});
- this.dispatchEvent(ev);
- }
- }
- readAsArrayBuffer(blob) {
- readOperation(this, blob, { kind: "ArrayBuffer" });
- }
- readAsBinaryString(blob) {
- // alias for readAsArrayBuffer
- readOperation(this, blob, { kind: "ArrayBuffer" });
- }
- readAsDataURL(blob) {
- readOperation(this, blob, { kind: "DataUrl" });
- }
- readAsText(blob, encoding) {
- readOperation(this, blob, { kind: "Text", encoding });
- }
- }
-
- FileReader.EMPTY = 0;
- FileReader.LOADING = 1;
- FileReader.DONE = 2;
-
- const handlerSymbol = Symbol("eventHandlers");
-
- function makeWrappedHandler(handler) {
- function wrappedHandler(...args) {
- if (typeof wrappedHandler.handler !== "function") {
- return;
- }
- return wrappedHandler.handler.call(this, ...args);
- }
- wrappedHandler.handler = handler;
- return wrappedHandler;
- }
- // TODO(benjamingr) reuse when we can reuse code between web crates
- function defineEventHandler(emitter, name) {
- // HTML specification section 8.1.5.1
- Object.defineProperty(emitter, `on${name}`, {
- get() {
- return this[handlerSymbol]?.get(name)?.handler;
- },
- set(value) {
- if (!this[handlerSymbol]) {
- this[handlerSymbol] = new Map();
- }
- let handlerWrapper = this[handlerSymbol]?.get(name);
- if (handlerWrapper) {
- handlerWrapper.handler = value;
- } else {
- handlerWrapper = makeWrappedHandler(value);
- this.addEventListener(name, handlerWrapper);
- }
- this[handlerSymbol].set(name, handlerWrapper);
- },
- configurable: true,
- enumerable: true,
- });
- }
- defineEventHandler(FileReader.prototype, "error");
- defineEventHandler(FileReader.prototype, "loadstart");
- defineEventHandler(FileReader.prototype, "load");
- defineEventHandler(FileReader.prototype, "loadend");
- defineEventHandler(FileReader.prototype, "progress");
- defineEventHandler(FileReader.prototype, "abort");
-
- window.__bootstrap.fileReader = {
- FileReader,
- };
-})(this);
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