lgoad-upload-action/node_modules/undici/lib/fileapi/filereader.js

345 lines
8.3 KiB
JavaScript
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

'use strict'
const {
staticPropertyDescriptors,
readOperation,
fireAProgressEvent
} = require('./util')
const {
kState,
kError,
kResult,
kEvents,
kAborted
} = require('./symbols')
const { webidl } = require('../fetch/webidl')
const { kEnumerableProperty } = require('../core/util')
class FileReader extends EventTarget {
constructor () {
super()
this[kState] = 'empty'
this[kResult] = null
this[kError] = null
this[kEvents] = {
loadend: null,
error: null,
abort: null,
load: null,
progress: null,
loadstart: null
}
}
/**
* @see https://w3c.github.io/FileAPI/#dfn-readAsArrayBuffer
* @param {import('buffer').Blob} blob
*/
readAsArrayBuffer (blob) {
webidl.brandCheck(this, FileReader)
webidl.argumentLengthCheck(arguments, 1, { header: 'FileReader.readAsArrayBuffer' })
blob = webidl.converters.Blob(blob, { strict: false })
// The readAsArrayBuffer(blob) method, when invoked,
// must initiate a read operation for blob with ArrayBuffer.
readOperation(this, blob, 'ArrayBuffer')
}
/**
* @see https://w3c.github.io/FileAPI/#readAsBinaryString
* @param {import('buffer').Blob} blob
*/
readAsBinaryString (blob) {
webidl.brandCheck(this, FileReader)
webidl.argumentLengthCheck(arguments, 1, { header: 'FileReader.readAsBinaryString' })
blob = webidl.converters.Blob(blob, { strict: false })
// The readAsBinaryString(blob) method, when invoked,
// must initiate a read operation for blob with BinaryString.
readOperation(this, blob, 'BinaryString')
}
/**
* @see https://w3c.github.io/FileAPI/#readAsDataText
* @param {import('buffer').Blob} blob
* @param {string?} encoding
*/
readAsText (blob, encoding = undefined) {
webidl.brandCheck(this, FileReader)
webidl.argumentLengthCheck(arguments, 1, { header: 'FileReader.readAsText' })
blob = webidl.converters.Blob(blob, { strict: false })
if (encoding !== undefined) {
encoding = webidl.converters.DOMString(encoding)
}
// The readAsText(blob, encoding) method, when invoked,
// must initiate a read operation for blob with Text and encoding.
readOperation(this, blob, 'Text', encoding)
}
/**
* @see https://w3c.github.io/FileAPI/#dfn-readAsDataURL
* @param {import('buffer').Blob} blob
*/
readAsDataURL (blob) {
webidl.brandCheck(this, FileReader)
webidl.argumentLengthCheck(arguments, 1, { header: 'FileReader.readAsDataURL' })
blob = webidl.converters.Blob(blob, { strict: false })
// The readAsDataURL(blob) method, when invoked, must
// initiate a read operation for blob with DataURL.
readOperation(this, blob, 'DataURL')
}
/**
* @see https://w3c.github.io/FileAPI/#dfn-abort
*/
abort () {
// 1. If this's state is "empty" or if this's state is
// "done" set this's result to null and terminate
// this algorithm.
if (this[kState] === 'empty' || this[kState] === 'done') {
this[kResult] = null
return
}
// 2. If this's state is "loading" set this's state to
// "done" and set this's result to null.
if (this[kState] === 'loading') {
this[kState] = 'done'
this[kResult] = null
}
// 3. If there are any tasks from this on the file reading
// task source in an affiliated task queue, then remove
// those tasks from that task queue.
this[kAborted] = true
// 4. Terminate the algorithm for the read method being processed.
// TODO
// 5. Fire a progress event called abort at this.
fireAProgressEvent('abort', this)
// 6. If this's state is not "loading", fire a progress
// event called loadend at this.
if (this[kState] !== 'loading') {
fireAProgressEvent('loadend', this)
}
}
/**
* @see https://w3c.github.io/FileAPI/#dom-filereader-readystate
*/
get readyState () {
webidl.brandCheck(this, FileReader)
switch (this[kState]) {
case 'empty': return this.EMPTY
case 'loading': return this.LOADING
case 'done': return this.DONE
}
}
/**
* @see https://w3c.github.io/FileAPI/#dom-filereader-result
*/
get result () {
webidl.brandCheck(this, FileReader)
// The result attributes getter, when invoked, must return
// this's result.
return this[kResult]
}
/**
* @see https://w3c.github.io/FileAPI/#dom-filereader-error
*/
get error () {
webidl.brandCheck(this, FileReader)
// The error attributes getter, when invoked, must return
// this's error.
return this[kError]
}
get onloadend () {
webidl.brandCheck(this, FileReader)
return this[kEvents].loadend
}
set onloadend (fn) {
webidl.brandCheck(this, FileReader)
if (this[kEvents].loadend) {
this.removeEventListener('loadend', this[kEvents].loadend)
}
if (typeof fn === 'function') {
this[kEvents].loadend = fn
this.addEventListener('loadend', fn)
} else {
this[kEvents].loadend = null
}
}
get onerror () {
webidl.brandCheck(this, FileReader)
return this[kEvents].error
}
set onerror (fn) {
webidl.brandCheck(this, FileReader)
if (this[kEvents].error) {
this.removeEventListener('error', this[kEvents].error)
}
if (typeof fn === 'function') {
this[kEvents].error = fn
this.addEventListener('error', fn)
} else {
this[kEvents].error = null
}
}
get onloadstart () {
webidl.brandCheck(this, FileReader)
return this[kEvents].loadstart
}
set onloadstart (fn) {
webidl.brandCheck(this, FileReader)
if (this[kEvents].loadstart) {
this.removeEventListener('loadstart', this[kEvents].loadstart)
}
if (typeof fn === 'function') {
this[kEvents].loadstart = fn
this.addEventListener('loadstart', fn)
} else {
this[kEvents].loadstart = null
}
}
get onprogress () {
webidl.brandCheck(this, FileReader)
return this[kEvents].progress
}
set onprogress (fn) {
webidl.brandCheck(this, FileReader)
if (this[kEvents].progress) {
this.removeEventListener('progress', this[kEvents].progress)
}
if (typeof fn === 'function') {
this[kEvents].progress = fn
this.addEventListener('progress', fn)
} else {
this[kEvents].progress = null
}
}
get onload () {
webidl.brandCheck(this, FileReader)
return this[kEvents].load
}
set onload (fn) {
webidl.brandCheck(this, FileReader)
if (this[kEvents].load) {
this.removeEventListener('load', this[kEvents].load)
}
if (typeof fn === 'function') {
this[kEvents].load = fn
this.addEventListener('load', fn)
} else {
this[kEvents].load = null
}
}
get onabort () {
webidl.brandCheck(this, FileReader)
return this[kEvents].abort
}
set onabort (fn) {
webidl.brandCheck(this, FileReader)
if (this[kEvents].abort) {
this.removeEventListener('abort', this[kEvents].abort)
}
if (typeof fn === 'function') {
this[kEvents].abort = fn
this.addEventListener('abort', fn)
} else {
this[kEvents].abort = null
}
}
}
// https://w3c.github.io/FileAPI/#dom-filereader-empty
FileReader.EMPTY = FileReader.prototype.EMPTY = 0
// https://w3c.github.io/FileAPI/#dom-filereader-loading
FileReader.LOADING = FileReader.prototype.LOADING = 1
// https://w3c.github.io/FileAPI/#dom-filereader-done
FileReader.DONE = FileReader.prototype.DONE = 2
Object.defineProperties(FileReader.prototype, {
EMPTY: staticPropertyDescriptors,
LOADING: staticPropertyDescriptors,
DONE: staticPropertyDescriptors,
readAsArrayBuffer: kEnumerableProperty,
readAsBinaryString: kEnumerableProperty,
readAsText: kEnumerableProperty,
readAsDataURL: kEnumerableProperty,
abort: kEnumerableProperty,
readyState: kEnumerableProperty,
result: kEnumerableProperty,
error: kEnumerableProperty,
onloadstart: kEnumerableProperty,
onprogress: kEnumerableProperty,
onload: kEnumerableProperty,
onabort: kEnumerableProperty,
onerror: kEnumerableProperty,
onloadend: kEnumerableProperty,
[Symbol.toStringTag]: {
value: 'FileReader',
writable: false,
enumerable: false,
configurable: true
}
})
Object.defineProperties(FileReader, {
EMPTY: staticPropertyDescriptors,
LOADING: staticPropertyDescriptors,
DONE: staticPropertyDescriptors
})
module.exports = {
FileReader
}