/* formdata-polyfill. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
/* global FormData self Blob File */
/* eslint-disable no-inner-declarations */
if (typeof Blob !== 'undefined' && (typeof FormData === 'undefined' || !FormData.prototype.keys)) {
const global = typeof globalThis === 'object'
? globalThis
: typeof window === 'object'
? window
: typeof self === 'object' ? self : this
// keep a reference to native implementation
const _FormData = global.FormData
// To be monkey patched
const _send = global.XMLHttpRequest && global.XMLHttpRequest.prototype.send
const _fetch = global.Request && global.fetch
const _sendBeacon = global.navigator && global.navigator.sendBeacon
// Might be a worker thread...
const _match = global.Element && global.Element.prototype
// Unable to patch Request/Response constructor correctly #109
// only way is to use ES6 class extend
// https://github.com/babel/babel/issues/1966
const stringTag = global.Symbol && Symbol.toStringTag
// Add missing stringTags to blob and files
if (stringTag) {
if (!Blob.prototype[stringTag]) {
Blob.prototype[stringTag] = 'Blob'
}
if ('File' in global && !File.prototype[stringTag]) {
File.prototype[stringTag] = 'File'
}
}
// Fix so you can construct your own File
try {
new File([], '') // eslint-disable-line
} catch (a) {
global.File = function File (b, d, c) {
const blob = new Blob(b, c || {})
const t = c && void 0 !== c.lastModified ? new Date(c.lastModified) : new Date()
Object.defineProperties(blob, {
name: {
value: d
},
lastModified: {
value: +t
},
toString: {
value () {
return '[object File]'
}
}
})
if (stringTag) {
Object.defineProperty(blob, stringTag, {
value: 'File'
})
}
return blob
}
}
function ensureArgs (args, expected) {
if (args.length < expected) {
throw new TypeError(`${expected} argument required, but only ${args.length} present.`)
}
}
/**
* @param {string} name
* @param {string | undefined} filename
* @returns {[string, File|string]}
*/
function normalizeArgs (name, value, filename) {
if (value instanceof Blob) {
filename = filename !== undefined
? String(filename + '')
: typeof value.name === 'string'
? value.name
: 'blob'
if (value.name !== filename || Object.prototype.toString.call(value) === '[object Blob]') {
value = new File([value], filename)
}
return [String(name), value]
}
return [String(name), String(value)]
}
// normalize line feeds for textarea
// https://html.spec.whatwg.org/multipage/form-elements.html#textarea-line-break-normalisation-transformation
function normalizeLinefeeds (value) {
return value.replace(/\r?\n|\r/g, '\r\n')
}
/**
* @template T
* @param {ArrayLike<T>} arr
* @param {{ (elm: T): void; }} cb
*/
function each (arr, cb) {
for (let i = 0; i < arr.length; i++) {
cb(arr[i])
}
}
const escape = str => str.replace(/\n/g, '%0A').replace(/\r/g, '%0D').replace(/"/g, '%22')
/**
* @implements {Iterable}
*/
class FormDataPolyfill {
/**
* FormData class
*
* @param {HTMLFormElement=} form
*/
constructor (form) {
/** @type {[string, string|File][]} */
this._data = []
const self = this
form && each(form.elements, (/** @type {HTMLInputElement} */ elm) => {
if (
!elm.name ||
elm.disabled ||
elm.type === 'submit' ||
elm.type === 'button' ||
elm.matches('form fieldset[disabled] *')
) return
if (elm.type === 'file') {
const files = elm.files && elm.files.length
? elm.files
: [new File([], '', { type: 'application/octet-stream' })] // #78
each(files, file => {
self.append(elm.name, file)
})
} else if (elm.type === 'select-multiple' || elm.type === 'select-one') {
each(elm.options, opt => {
!opt.disabled && opt.selected && self.append(elm.name, opt.value)
})
} else if (elm.type === 'checkbox' || elm.type === 'radio') {
if (elm.checked) self.append(elm.name, elm.value)
} else {
const value = elm.type === 'textarea' ? normalizeLinefeeds(elm.value) : elm.value
self.append(elm.name, value)
}
})
}
/**
* Append a field
*
* @param {string} name field name
* @param {string|Blob|File} value string / blob / file
* @param {string=} filename filename to use with blob
* @return {undefined}
*/
append (name, value, filename) {
ensureArgs(arguments, 2)
this._data.push(normalizeArgs(name, value, filename))
}
/**
* Delete all fields values given name
*
* @param {string} name Field name
* @return {undefined}
*/
delete (name) {
ensureArgs(arguments, 1)
const result = []
name = String(name)
each(this._data, entry => {
entry[0] !== name && result.push(entry)
})
this._data = result
}
/**
* Iterate over all fields as [name, value]
*
* @return {Iterator}
*/
* entries () {
for (var i = 0; i < this._data.length; i++) {
yield this._data[i]
}
}
/**
* Iterate over all fields
*
* @param {Function} callback Executed for each item with parameters (value, name, thisArg)
* @param {Object=} thisArg `this` context for callback function
*/
forEach (callback, thisArg) {
ensureArgs(arguments, 1)
for (const [name, value] of this) {
callback.call(thisArg, value, name, this)
}
}
/**
* Return first field value given name
* or null if non existent
*
* @param {string} name Field name
* @return {string|File|null} value Fields value
*/
get (name) {
ensureArgs(arguments, 1)
const entries = this._data
name = String(name)
for (let i = 0; i < entries.length; i++) {
if (entries[i][0] === name) {
return entries[i][1]
}
}
return null
}
/**
* Return all fields values given name
*
* @param {string} name Fields name
* @return {Array} [{String|File}]
*/
getAll (name) {
ensureArgs(arguments, 1)
const result = []
name = String(name)
each(this._data, data => {
data[0] === name && result.push(data[1])
})
return result
}
/**
* Check for field name existence
*
* @param {string} name Field name
* @return {boolean}
*/
has (name) {
ensureArgs(arguments, 1)
name = String(name)
for (let i = 0; i < this._data.length; i++) {
if (this._data[i][0] === name) {
return true
}
}
return false
}
/**
* Iterate over all fields name
*
* @return {Iterator}
*/
* keys () {
for (const [name] of this) {
yield name
}
}
/**
* Overwrite all values given name
*
* @param {string} name Filed name
* @param {string} value Field value
* @param {string=} filename Filename (optional)
*/
set (name, value, filename) {
ensureArgs(arguments, 2)
name = String(name)
/** @type {[string, string|File][]} */
const result = []
const args = normalizeArgs(name, value, filename)
let replace = true
// - replace the first occurrence with same name
// - discards the remaining with same name
// - while keeping the same order items where added
each(this._data, data => {
data[0] === name
? replace && (replace = !result.push(args))
: result.push(data)
})
replace && result.push(args)
this._data = result
}
/**
* Iterate over all fields
*
* @return {Iterator}
*/
* values () {
for (const [, value] of this) {
yield value
}
}
/**
* Return a native (perhaps degraded) FormData with only a `append` method
* Can throw if it's not supported
*
* @return {FormData}
*/
['_asNative'] () {
const fd = new _FormData()
for (const [name, value] of this) {
fd.append(name, value)
}
return fd
}
/**
* [_blob description]
*
* @return {Blob} [description]
*/
['_blob'] () {
const boundary = '----formdata-polyfill-' + Math.random(),
chunks = [],
p = `--${boundary}\r\nContent-Disposition: form-data; name="`
this.forEach((value, name) => typeof value == 'string'
? chunks.push(p + escape(normalizeLinefeeds(name)) + `"\r\n\r\n${normalizeLinefeeds(value)}\r\n`)
: chunks.push(p + escape(normalizeLinefeeds(name)) + `"; filename="${escape(value.name)}"\r\nContent-Type: ${value.type||"application/octet-stream"}\r\n\r\n`, value, `\r\n`))
chunks.push(`--${boundary}--`)
return new Blob(chunks, {
type: "multipart/form-data; boundary=" + boundary
})
}
/**
* The class itself is iterable
* alias for formdata.entries()
*
* @return {Iterator}
*/
[Symbol.iterator] () {
return this.entries()
}
/**
* Create the default string description.
*
* @return {string} [object FormData]
*/
toString () {
return '[object FormData]'
}
}
if (_match && !_match.matches) {
_match.matches =
_match.matchesSelector ||
_match.mozMatchesSelector ||
_match.msMatchesSelector ||
_match.oMatchesSelector ||
_match.webkitMatchesSelector ||
function (s) {
var matches = (this.document || this.ownerDocument).querySelectorAll(s)
var i = matches.length
while (--i >= 0 && matches.item(i) !== this) {}
return i > -1
}
}
if (stringTag) {
/**
* Create the default string description.
* It is accessed internally by the Object.prototype.toString().
*/
FormDataPolyfill.prototype[stringTag] = 'FormData'
}
// Patch xhr's send method to call _blob transparently
if (_send) {
const setRequestHeader = global.XMLHttpRequest.prototype.setRequestHeader
global.XMLHttpRequest.prototype.setRequestHeader = function (name, value) {
setRequestHeader.call(this, name, value)
if (name.toLowerCase() === 'content-type') this._hasContentType = true
}
global.XMLHttpRequest.prototype.send = function (data) {
// need to patch send b/c old IE don't send blob's type (#44)
if (data instanceof FormDataPolyfill) {
const blob = data['_blob']()
if (!this._hasContentType) this.setRequestHeader('Content-Type', blob.type)
_send.call(this, blob)
} else {
_send.call(this, data)
}
}
}
// Patch fetch's function to call _blob transparently
if (_fetch) {
global.fetch = function (input, init) {
if (init && init.body && init.body instanceof FormDataPolyfill) {
init.body = init.body['_blob']()
}
return _fetch.call(this, input, init)
}
}
// Patch navigator.sendBeacon to use native FormData
if (_sendBeacon) {
global.navigator.sendBeacon = function (url, data) {
if (data instanceof FormDataPolyfill) {
data = data['_asNative']()
}
return _sendBeacon.call(this, url, data)
}
}
global['FormData'] = FormDataPolyfill
}
في جولة حصرية داخل “الغرفة الزرقاء” بقناة BBC العربية، نكشف كواليس واحدة من أكثر غرف الأخبار تطورًا في العالم.
كيف الذكاء اصطناعي يتحكم بالبث دون تدخل بشري، لتقدم تجربة بصرية مذهلة.
الفيديو يستعرض كيف تمزج BBC بين التقنية والاحتراف لتصنع نشرات إخبارية من قلب المستقبل.