rm files
howard
parent
6db59c5758
commit
245ec87ba4
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/**
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* Copyright 2019 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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/* exported getFileHandle, getNewFileHandle, readFile, verifyPermission,
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writeFile */
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/**
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* Open a handle to an existing file on the local file system.
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*
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* @return {!Promise<FileSystemFileHandle>} Handle to the existing file.
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*/
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function getFileHandle() {
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// For Chrome 86 and later...
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if ('showOpenFilePicker' in window) {
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return window.showOpenFilePicker().then((handles) => handles[0]);
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}
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// For Chrome 85 and earlier...
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return window.chooseFileSystemEntries();
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}
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/**
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* Create a handle to a new (text) file on the local file system.
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*
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* @return {!Promise<FileSystemFileHandle>} Handle to the new file.
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*/
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function getNewFileHandle() {
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// For Chrome 86 and later...
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if ('showSaveFilePicker' in window) {
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const opts = {
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types: [{
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description: 'Text file',
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accept: {'text/plain': ['.txt']},
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}],
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};
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return window.showSaveFilePicker(opts);
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}
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// For Chrome 85 and earlier...
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const opts = {
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type: 'save-file',
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accepts: [{
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description: 'Text file',
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extensions: ['txt'],
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mimeTypes: ['text/plain'],
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}],
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};
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return window.chooseFileSystemEntries(opts);
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}
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/**
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* Reads the raw text from a file.
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*
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* @param {File} file
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* @return {!Promise<string>} A promise that resolves to the parsed string.
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*/
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function readFile(file) {
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// If the new .text() reader is available, use it.
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if (file.text) {
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return file.text();
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}
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// Otherwise use the traditional file reading technique.
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return _readFileLegacy(file);
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}
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/**
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* Reads the raw text from a file.
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*
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* @private
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* @param {File} file
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* @return {Promise<string>} A promise that resolves to the parsed string.
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*/
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function _readFileLegacy(file) {
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return new Promise((resolve) => {
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const reader = new FileReader();
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reader.addEventListener('loadend', (e) => {
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const text = e.srcElement.result;
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resolve(text);
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});
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reader.readAsText(file);
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});
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}
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/**
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* Writes the contents to disk.
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*
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* @param {FileSystemFileHandle} fileHandle File handle to write to.
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* @param {string} contents Contents to write.
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*/
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async function writeFile(fileHandle, contents) {
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// Support for Chrome 82 and earlier.
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if (fileHandle.createWriter) {
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// Create a writer (request permission if necessary).
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const writer = await fileHandle.createWriter();
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// Write the full length of the contents
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await writer.write(0, contents);
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// Close the file and write the contents to disk
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await writer.close();
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return;
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}
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// For Chrome 83 and later.
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// Create a FileSystemWritableFileStream to write to.
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const writable = await fileHandle.createWritable();
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// Write the contents of the file to the stream.
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await writable.write(contents);
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// Close the file and write the contents to disk.
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await writable.close();
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}
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/**
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* Verify the user has granted permission to read or write to the file, if
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* permission hasn't been granted, request permission.
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*
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* @param {FileSystemFileHandle} fileHandle File handle to check.
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* @param {boolean} withWrite True if write permission should be checked.
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* @return {boolean} True if the user has granted read/write permission.
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*/
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async function verifyPermission(fileHandle, withWrite) {
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const opts = {};
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if (withWrite) {
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opts.writable = true;
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// For Chrome 86 and later...
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opts.mode = 'readwrite';
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}
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// Check if we already have permission, if so, return true.
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if (await fileHandle.queryPermission(opts) === 'granted') {
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return true;
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}
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// Request permission to the file, if the user grants permission, return true.
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if (await fileHandle.requestPermission(opts) === 'granted') {
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return true;
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}
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// The user did nt grant permission, return false.
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return false;
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}
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@ -1 +0,0 @@
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