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| Current File : //home/ubuntu/node-v16.18.1/deps/v8/tools/system-analyzer/view/log-file-reader.mjs |
// Copyright 2020 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import {delay} from '../helper.mjs';
import {DOM, V8CustomElement} from './helper.mjs';
DOM.defineCustomElement('view/log-file-reader',
(templateText) =>
class LogFileReader extends V8CustomElement {
constructor() {
super(templateText);
this.addEventListener('click', e => this.handleClick(e));
this.addEventListener('dragover', e => this.handleDragOver(e));
this.addEventListener('drop', e => this.handleChange(e));
this.$('#file').addEventListener('change', e => this.handleChange(e));
this.$('#fileReader')
.addEventListener('keydown', e => this.handleKeyEvent(e));
}
set error(message) {
this._updateLabel(message);
this.root.className = 'fail';
}
_updateLabel(text) {
this.$('#label').innerText = text;
}
handleKeyEvent(event) {
if (event.key == 'Enter') this.handleClick(event);
}
handleClick(event) {
this.$('#file').click();
}
handleChange(event) {
// Used for drop and file change.
event.preventDefault();
this.dispatchEvent(
new CustomEvent('fileuploadstart', {bubbles: true, composed: true}));
const host = event.dataTransfer ? event.dataTransfer : event.target;
this.readFile(host.files[0]);
}
handleDragOver(event) {
event.preventDefault();
}
connectedCallback() {
this.fileReader.focus();
}
get fileReader() {
return this.$('#fileReader');
}
get root() {
return this.$('#root');
}
readFile(file) {
if (!file) {
this.error = 'Failed to load file.';
return;
}
this.fileReader.blur();
this.root.className = 'loading';
// Delay the loading a bit to allow for CSS animations to happen.
window.requestAnimationFrame(() => this.asyncReadFile(file));
}
async asyncReadFile(file) {
const decoder = globalThis.TextDecoderStream;
if (decoder) {
await this._streamFile(file, decoder);
} else {
await this._readFullFile(file);
}
this._updateLabel(`Finished loading '${file.name}'.`);
this.dispatchEvent(
new CustomEvent('fileuploadend', {bubbles: true, composed: true}));
this.root.className = 'done';
}
async _readFullFile(file) {
const text = await file.text();
this._handleFileChunk(text)
}
async _streamFile(file, decoder) {
const stream = file.stream().pipeThrough(new decoder());
const reader = stream.getReader();
let chunk, readerDone;
do {
const readResult = await reader.read();
chunk = readResult.value;
readerDone = readResult.done;
if (chunk) this._handleFileChunk(chunk);
} while (!readerDone);
}
_handleFileChunk(chunk) {
this.dispatchEvent(new CustomEvent('fileuploadchunk', {
bubbles: true,
composed: true,
detail: chunk,
}));
}
});
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