@plattar/plattar-qrcode
Version:
Allows embedding Plattar-Style QR Codes for existing websites.
931 lines (904 loc) • 288 kB
JavaScript
"use strict";
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(function (f) {
if ((typeof exports === "undefined" ? "undefined" : _typeof(exports)) === "object" && typeof module !== "undefined") {
module.exports = f();
} else if (typeof define === "function" && define.amd) {
define([], f);
} else {
var g;
if (typeof window !== "undefined") {
g = window;
} else if (typeof global !== "undefined") {
g = global;
} else if (typeof self !== "undefined") {
g = self;
} else {
g = this;
}
g.PlattarQRCode = f();
}
})(function () {
var define, module, exports;
return function () {
function r(e, n, t) {
function o(i, f) {
if (!n[i]) {
if (!e[i]) {
var c = "function" == typeof require && require;
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if (u) return u(i, !0);
var a = new Error("Cannot find module '" + i + "'");
throw a.code = "MODULE_NOT_FOUND", a;
}
var p = n[i] = {
exports: {}
};
e[i][0].call(p.exports, function (r) {
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return o(n || r);
}, p, p.exports, r, e, n, t);
}
return n[i].exports;
}
for (var u = "function" == typeof require && require, i = 0; i < t.length; i++) o(t[i]);
return o;
}
return r;
}()({
1: [function (require, module, exports) {
var QRCodeStyling = require("qr-code-styling");
var hash = require("object-hash");
var BaseElement = /*#__PURE__*/function (_HTMLElement) {
function BaseElement() {
_classCallCheck(this, BaseElement);
return _callSuper(this, BaseElement);
}
_inherits(BaseElement, _HTMLElement);
return _createClass(BaseElement, [{
key: "connectedCallback",
value: function connectedCallback() {
var _this = this;
if (this.hasAttribute("url")) {
this.renderQRCode();
}
var observer = new MutationObserver(function (mutations) {
mutations.forEach(function (mutation) {
if (mutation.type === "attributes") {
if (_this.hasAttribute("url")) {
_this.renderQRCode();
}
}
});
});
observer.observe(this, {
attributes: true
});
}
}, {
key: "download",
value: function download(options) {
var opt = options || {
name: "plattar-qrcode",
extension: "png"
};
if (this._qrCode) {
this._qrCode.download(opt);
}
}
}, {
key: "renderQRCode",
value: function renderQRCode() {
var _this2 = this;
var url = this.hasAttribute("url") ? this.getAttribute("url") : undefined;
if (!url) {
console.warn("PlattarQR.renderQRCode() - required attribute \"url\" is missing or invalid, QR Code will not render");
return;
}
var width = this.hasAttribute("width") ? this.getAttribute("width") : "100%";
var height = this.hasAttribute("height") ? this.getAttribute("height") : "100%";
var margin = this.hasAttribute("margin") ? this.getAttribute("margin") : 0;
var image = this.hasAttribute("image") ? this.getAttribute("image") : undefined;
var color = this.hasAttribute("color") ? this.getAttribute("color") : "#000000";
var style = this.hasAttribute("qr-type") ? this.getAttribute("qr-type") : "default";
// used to check if anything has changed in the options
// to avoid re-rendering
this._optionsHash = '0';
this._options = this._options || {
imageOptions: {
hideBackgroundDots: true,
imageSize: 0.4,
margin: 0
},
dotsOptions: {
type: "rounded"
},
backgroundOptions: {
color: "#ffffff"
},
dotsOptionsHelper: {
colorType: {
single: true,
gradient: false
},
gradient: {
linear: true,
radial: false,
color1: "#6a1a4c",
color2: "#6a1a4c",
rotation: "0"
}
},
cornersSquareOptions: {
type: "extra-rounded"
},
cornersSquareOptionsHelper: {
colorType: {
single: true,
gradient: false
},
gradient: {
linear: true,
radial: false,
color1: "#000000",
color2: "#000000",
rotation: "0"
}
},
cornersDotOptions: {
type: "dot"
},
cornersDotOptionsHelper: {
colorType: {
single: true,
gradient: false
},
gradient: {
linear: true,
radial: false,
color1: "#000000",
color2: "#000000",
rotation: "0"
}
},
backgroundOptionsHelper: {
colorType: {
single: true,
gradient: false
},
gradient: {
linear: true,
radial: false,
color1: "#ffffff",
color2: "#ffffff",
rotation: "0"
}
},
width: 1024,
height: 1024,
type: "canvas"
};
this._options.margin = margin;
this._options.image = image;
// set the colors
this._options.dotsOptions.color = color;
this._options.cornersDotOptions.color = color;
this._options.cornersSquareOptions.color = color;
switch (style) {
case "dots":
this._options.dotsOptions.type = "dots";
break;
case "default":
default:
this._options.dotsOptions.type = "rounded";
}
var shortenURL = this.hasAttribute("shorten") ? this.getAttribute("shorten") : "false";
if (shortenURL && shortenURL.toLowerCase() === "true") {
this._ShortenURL(url).then(function (newURL) {
// make sure by time promise is resolved that the original url hasn't been updated
var updatedURL = _this2.hasAttribute("url") ? _this2.getAttribute("url") : undefined;
if (updatedURL === url) {
_this2._GenerateQRCode(newURL, width, height);
}
})["catch"](function (_err) {
console.warn(_err);
// ignore error and just generate normal QR Code
// make sure by time promise is resolved that the original url hasn't been updated
var updatedURL = _this2.hasAttribute("url") ? _this2.getAttribute("url") : undefined;
if (updatedURL === url) {
_this2._GenerateQRCode(url, width, height);
}
});
} else {
this._GenerateQRCode(url, width, height);
}
}
}, {
key: "_UpdateCanvas",
value: function _UpdateCanvas(width, height) {
if (!this._qrCode) {
return;
}
var canvas = this._qrCode._domCanvas || this._qrCode._canvas;
if (canvas) {
if (canvas.style.width !== "100%") {
canvas.style.width = "100%";
}
if (canvas.style.height !== "100%") {
canvas.style.height = "100%";
}
}
if (this._divContainer) {
var div = this._divContainer;
if (div.style.width !== width) {
div.style.width = width;
}
if (div.style.height !== height) {
div.style.height = height;
}
}
}
}, {
key: "_GenerateQRCode",
value: function _GenerateQRCode(url, width, height) {
this._options.data = url;
var shadow = this.shadowRoot || this.attachShadow({
mode: 'open'
});
var qrCode = this._qrCode;
if (!qrCode) {
var div = document.createElement("div");
div.style.display = "none";
shadow.appendChild(div);
this._divContainer = div;
this._qrCode = new QRCodeStyling(this._options);
this._qrCode.append(div);
this._UpdateCanvas(width, height);
div.style.display = "flex";
return;
}
var newHash = hash({
options: this._options,
width: width,
height: height
});
if (this._optionsHash !== newHash) {
this._optionsHash = newHash;
this._qrCode.update(this._options);
this._UpdateCanvas(width, height);
}
}
}, {
key: "_IsFetchAPISupported",
value: function _IsFetchAPISupported() {
return "fetch" in window;
}
}, {
key: "_ShortenURL",
value: function _ShortenURL(url) {
var _this3 = this;
return new Promise(function (accept, reject) {
if (!_this3._IsFetchAPISupported()) {
return reject(new Error("PlattarQR._ShortenURL() - fetch api not supported, cannot proceed"));
}
try {
var b64Link = btoa(url);
fetch("https://c.plattar.com/shorten", {
cache: "no-store",
method: "POST",
headers: {
"Content-Type": "application/json"
},
body: JSON.stringify({
data: {
attributes: {
url: b64Link,
isBase64: true
}
}
})
}).then(function (response) {
if (!response.ok) {
throw new Error("PlattarQR._ShortenURL() - response was invalid");
}
return response.json();
}).then(function (json) {
return accept(json.data.attributes.url);
})["catch"](function () {
return reject(new Error("PlattarQR._ShortenURL() - there was an unexpected issue generating short url"));
});
} catch (err) {
return reject(err);
}
});
}
}]);
}(/*#__PURE__*/_wrapNativeSuper(HTMLElement));
module.exports = BaseElement;
}, {
"object-hash": 7,
"qr-code-styling": 8
}],
2: [function (require, module, exports) {
var BaseElement = require("./base/base-element.js");
var QRCodeElement = /*#__PURE__*/function (_BaseElement) {
function QRCodeElement() {
_classCallCheck(this, QRCodeElement);
return _callSuper(this, QRCodeElement);
}
_inherits(QRCodeElement, _BaseElement);
return _createClass(QRCodeElement);
}(BaseElement);
module.exports = QRCodeElement;
}, {
"./base/base-element.js": 1
}],
3: [function (require, module, exports) {
"use strict";
var QRCodeElement = require("./elements/qrcode-element.js");
var Version = require("./version");
if (customElements) {
if (customElements.get("plattar-qrcode") === undefined) {
customElements.define("plattar-qrcode", QRCodeElement);
}
}
console.log("using @plattar/plattar-qrcode v" + Version);
module.exports = {
version: Version
};
}, {
"./elements/qrcode-element.js": 2,
"./version": 9
}],
4: [function (require, module, exports) {
'use strict';
exports.byteLength = byteLength;
exports.toByteArray = toByteArray;
exports.fromByteArray = fromByteArray;
var lookup = [];
var revLookup = [];
var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array;
var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
for (var i = 0, len = code.length; i < len; ++i) {
lookup[i] = code[i];
revLookup[code.charCodeAt(i)] = i;
}
// Support decoding URL-safe base64 strings, as Node.js does.
// See: https://en.wikipedia.org/wiki/Base64#URL_applications
revLookup['-'.charCodeAt(0)] = 62;
revLookup['_'.charCodeAt(0)] = 63;
function getLens(b64) {
var len = b64.length;
if (len % 4 > 0) {
throw new Error('Invalid string. Length must be a multiple of 4');
}
// Trim off extra bytes after placeholder bytes are found
// See: https://github.com/beatgammit/base64-js/issues/42
var validLen = b64.indexOf('=');
if (validLen === -1) validLen = len;
var placeHoldersLen = validLen === len ? 0 : 4 - validLen % 4;
return [validLen, placeHoldersLen];
}
// base64 is 4/3 + up to two characters of the original data
function byteLength(b64) {
var lens = getLens(b64);
var validLen = lens[0];
var placeHoldersLen = lens[1];
return (validLen + placeHoldersLen) * 3 / 4 - placeHoldersLen;
}
function _byteLength(b64, validLen, placeHoldersLen) {
return (validLen + placeHoldersLen) * 3 / 4 - placeHoldersLen;
}
function toByteArray(b64) {
var tmp;
var lens = getLens(b64);
var validLen = lens[0];
var placeHoldersLen = lens[1];
var arr = new Arr(_byteLength(b64, validLen, placeHoldersLen));
var curByte = 0;
// if there are placeholders, only get up to the last complete 4 chars
var len = placeHoldersLen > 0 ? validLen - 4 : validLen;
var i;
for (i = 0; i < len; i += 4) {
tmp = revLookup[b64.charCodeAt(i)] << 18 | revLookup[b64.charCodeAt(i + 1)] << 12 | revLookup[b64.charCodeAt(i + 2)] << 6 | revLookup[b64.charCodeAt(i + 3)];
arr[curByte++] = tmp >> 16 & 0xFF;
arr[curByte++] = tmp >> 8 & 0xFF;
arr[curByte++] = tmp & 0xFF;
}
if (placeHoldersLen === 2) {
tmp = revLookup[b64.charCodeAt(i)] << 2 | revLookup[b64.charCodeAt(i + 1)] >> 4;
arr[curByte++] = tmp & 0xFF;
}
if (placeHoldersLen === 1) {
tmp = revLookup[b64.charCodeAt(i)] << 10 | revLookup[b64.charCodeAt(i + 1)] << 4 | revLookup[b64.charCodeAt(i + 2)] >> 2;
arr[curByte++] = tmp >> 8 & 0xFF;
arr[curByte++] = tmp & 0xFF;
}
return arr;
}
function tripletToBase64(num) {
return lookup[num >> 18 & 0x3F] + lookup[num >> 12 & 0x3F] + lookup[num >> 6 & 0x3F] + lookup[num & 0x3F];
}
function encodeChunk(uint8, start, end) {
var tmp;
var output = [];
for (var i = start; i < end; i += 3) {
tmp = (uint8[i] << 16 & 0xFF0000) + (uint8[i + 1] << 8 & 0xFF00) + (uint8[i + 2] & 0xFF);
output.push(tripletToBase64(tmp));
}
return output.join('');
}
function fromByteArray(uint8) {
var tmp;
var len = uint8.length;
var extraBytes = len % 3; // if we have 1 byte left, pad 2 bytes
var parts = [];
var maxChunkLength = 16383; // must be multiple of 3
// go through the array every three bytes, we'll deal with trailing stuff later
for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
parts.push(encodeChunk(uint8, i, i + maxChunkLength > len2 ? len2 : i + maxChunkLength));
}
// pad the end with zeros, but make sure to not forget the extra bytes
if (extraBytes === 1) {
tmp = uint8[len - 1];
parts.push(lookup[tmp >> 2] + lookup[tmp << 4 & 0x3F] + '==');
} else if (extraBytes === 2) {
tmp = (uint8[len - 2] << 8) + uint8[len - 1];
parts.push(lookup[tmp >> 10] + lookup[tmp >> 4 & 0x3F] + lookup[tmp << 2 & 0x3F] + '=');
}
return parts.join('');
}
}, {}],
5: [function (require, module, exports) {
(function (Buffer) {
(function () {
/*!
* The buffer module from node.js, for the browser.
*
* @author Feross Aboukhadijeh <https://feross.org>
* @license MIT
*/
/* eslint-disable no-proto */
'use strict';
var base64 = require('base64-js');
var ieee754 = require('ieee754');
exports.Buffer = Buffer;
exports.SlowBuffer = SlowBuffer;
exports.INSPECT_MAX_BYTES = 50;
var K_MAX_LENGTH = 0x7fffffff;
exports.kMaxLength = K_MAX_LENGTH;
/**
* If `Buffer.TYPED_ARRAY_SUPPORT`:
* === true Use Uint8Array implementation (fastest)
* === false Print warning and recommend using `buffer` v4.x which has an Object
* implementation (most compatible, even IE6)
*
* Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
* Opera 11.6+, iOS 4.2+.
*
* We report that the browser does not support typed arrays if the are not subclassable
* using __proto__. Firefox 4-29 lacks support for adding new properties to `Uint8Array`
* (See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438). IE 10 lacks support
* for __proto__ and has a buggy typed array implementation.
*/
Buffer.TYPED_ARRAY_SUPPORT = typedArraySupport();
if (!Buffer.TYPED_ARRAY_SUPPORT && typeof console !== 'undefined' && typeof console.error === 'function') {
console.error('This browser lacks typed array (Uint8Array) support which is required by ' + '`buffer` v5.x. Use `buffer` v4.x if you require old browser support.');
}
function typedArraySupport() {
// Can typed array instances can be augmented?
try {
var arr = new Uint8Array(1);
arr.__proto__ = {
__proto__: Uint8Array.prototype,
foo: function foo() {
return 42;
}
};
return arr.foo() === 42;
} catch (e) {
return false;
}
}
Object.defineProperty(Buffer.prototype, 'parent', {
enumerable: true,
get: function get() {
if (!Buffer.isBuffer(this)) return undefined;
return this.buffer;
}
});
Object.defineProperty(Buffer.prototype, 'offset', {
enumerable: true,
get: function get() {
if (!Buffer.isBuffer(this)) return undefined;
return this.byteOffset;
}
});
function createBuffer(length) {
if (length > K_MAX_LENGTH) {
throw new RangeError('The value "' + length + '" is invalid for option "size"');
}
// Return an augmented `Uint8Array` instance
var buf = new Uint8Array(length);
buf.__proto__ = Buffer.prototype;
return buf;
}
/**
* The Buffer constructor returns instances of `Uint8Array` that have their
* prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
* `Uint8Array`, so the returned instances will have all the node `Buffer` methods
* and the `Uint8Array` methods. Square bracket notation works as expected -- it
* returns a single octet.
*
* The `Uint8Array` prototype remains unmodified.
*/
function Buffer(arg, encodingOrOffset, length) {
// Common case.
if (typeof arg === 'number') {
if (typeof encodingOrOffset === 'string') {
throw new TypeError('The "string" argument must be of type string. Received type number');
}
return allocUnsafe(arg);
}
return from(arg, encodingOrOffset, length);
}
// Fix subarray() in ES2016. See: https://github.com/feross/buffer/pull/97
if (typeof Symbol !== 'undefined' && Symbol.species != null && Buffer[Symbol.species] === Buffer) {
Object.defineProperty(Buffer, Symbol.species, {
value: null,
configurable: true,
enumerable: false,
writable: false
});
}
Buffer.poolSize = 8192; // not used by this implementation
function from(value, encodingOrOffset, length) {
if (typeof value === 'string') {
return fromString(value, encodingOrOffset);
}
if (ArrayBuffer.isView(value)) {
return fromArrayLike(value);
}
if (value == null) {
throw TypeError('The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' + 'or Array-like Object. Received type ' + _typeof(value));
}
if (isInstance(value, ArrayBuffer) || value && isInstance(value.buffer, ArrayBuffer)) {
return fromArrayBuffer(value, encodingOrOffset, length);
}
if (typeof value === 'number') {
throw new TypeError('The "value" argument must not be of type number. Received type number');
}
var valueOf = value.valueOf && value.valueOf();
if (valueOf != null && valueOf !== value) {
return Buffer.from(valueOf, encodingOrOffset, length);
}
var b = fromObject(value);
if (b) return b;
if (typeof Symbol !== 'undefined' && Symbol.toPrimitive != null && typeof value[Symbol.toPrimitive] === 'function') {
return Buffer.from(value[Symbol.toPrimitive]('string'), encodingOrOffset, length);
}
throw new TypeError('The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' + 'or Array-like Object. Received type ' + _typeof(value));
}
/**
* Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
* if value is a number.
* Buffer.from(str[, encoding])
* Buffer.from(array)
* Buffer.from(buffer)
* Buffer.from(arrayBuffer[, byteOffset[, length]])
**/
Buffer.from = function (value, encodingOrOffset, length) {
return from(value, encodingOrOffset, length);
};
// Note: Change prototype *after* Buffer.from is defined to workaround Chrome bug:
// https://github.com/feross/buffer/pull/148
Buffer.prototype.__proto__ = Uint8Array.prototype;
Buffer.__proto__ = Uint8Array;
function assertSize(size) {
if (typeof size !== 'number') {
throw new TypeError('"size" argument must be of type number');
} else if (size < 0) {
throw new RangeError('The value "' + size + '" is invalid for option "size"');
}
}
function alloc(size, fill, encoding) {
assertSize(size);
if (size <= 0) {
return createBuffer(size);
}
if (fill !== undefined) {
// Only pay attention to encoding if it's a string. This
// prevents accidentally sending in a number that would
// be interpretted as a start offset.
return typeof encoding === 'string' ? createBuffer(size).fill(fill, encoding) : createBuffer(size).fill(fill);
}
return createBuffer(size);
}
/**
* Creates a new filled Buffer instance.
* alloc(size[, fill[, encoding]])
**/
Buffer.alloc = function (size, fill, encoding) {
return alloc(size, fill, encoding);
};
function allocUnsafe(size) {
assertSize(size);
return createBuffer(size < 0 ? 0 : checked(size) | 0);
}
/**
* Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
* */
Buffer.allocUnsafe = function (size) {
return allocUnsafe(size);
};
/**
* Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
*/
Buffer.allocUnsafeSlow = function (size) {
return allocUnsafe(size);
};
function fromString(string, encoding) {
if (typeof encoding !== 'string' || encoding === '') {
encoding = 'utf8';
}
if (!Buffer.isEncoding(encoding)) {
throw new TypeError('Unknown encoding: ' + encoding);
}
var length = byteLength(string, encoding) | 0;
var buf = createBuffer(length);
var actual = buf.write(string, encoding);
if (actual !== length) {
// Writing a hex string, for example, that contains invalid characters will
// cause everything after the first invalid character to be ignored. (e.g.
// 'abxxcd' will be treated as 'ab')
buf = buf.slice(0, actual);
}
return buf;
}
function fromArrayLike(array) {
var length = array.length < 0 ? 0 : checked(array.length) | 0;
var buf = createBuffer(length);
for (var i = 0; i < length; i += 1) {
buf[i] = array[i] & 255;
}
return buf;
}
function fromArrayBuffer(array, byteOffset, length) {
if (byteOffset < 0 || array.byteLength < byteOffset) {
throw new RangeError('"offset" is outside of buffer bounds');
}
if (array.byteLength < byteOffset + (length || 0)) {
throw new RangeError('"length" is outside of buffer bounds');
}
var buf;
if (byteOffset === undefined && length === undefined) {
buf = new Uint8Array(array);
} else if (length === undefined) {
buf = new Uint8Array(array, byteOffset);
} else {
buf = new Uint8Array(array, byteOffset, length);
}
// Return an augmented `Uint8Array` instance
buf.__proto__ = Buffer.prototype;
return buf;
}
function fromObject(obj) {
if (Buffer.isBuffer(obj)) {
var len = checked(obj.length) | 0;
var buf = createBuffer(len);
if (buf.length === 0) {
return buf;
}
obj.copy(buf, 0, 0, len);
return buf;
}
if (obj.length !== undefined) {
if (typeof obj.length !== 'number' || numberIsNaN(obj.length)) {
return createBuffer(0);
}
return fromArrayLike(obj);
}
if (obj.type === 'Buffer' && Array.isArray(obj.data)) {
return fromArrayLike(obj.data);
}
}
function checked(length) {
// Note: cannot use `length < K_MAX_LENGTH` here because that fails when
// length is NaN (which is otherwise coerced to zero.)
if (length >= K_MAX_LENGTH) {
throw new RangeError('Attempt to allocate Buffer larger than maximum ' + 'size: 0x' + K_MAX_LENGTH.toString(16) + ' bytes');
}
return length | 0;
}
function SlowBuffer(length) {
if (+length != length) {
// eslint-disable-line eqeqeq
length = 0;
}
return Buffer.alloc(+length);
}
Buffer.isBuffer = function isBuffer(b) {
return b != null && b._isBuffer === true && b !== Buffer.prototype; // so Buffer.isBuffer(Buffer.prototype) will be false
};
Buffer.compare = function compare(a, b) {
if (isInstance(a, Uint8Array)) a = Buffer.from(a, a.offset, a.byteLength);
if (isInstance(b, Uint8Array)) b = Buffer.from(b, b.offset, b.byteLength);
if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
throw new TypeError('The "buf1", "buf2" arguments must be one of type Buffer or Uint8Array');
}
if (a === b) return 0;
var x = a.length;
var y = b.length;
for (var i = 0, len = Math.min(x, y); i < len; ++i) {
if (a[i] !== b[i]) {
x = a[i];
y = b[i];
break;
}
}
if (x < y) return -1;
if (y < x) return 1;
return 0;
};
Buffer.isEncoding = function isEncoding(encoding) {
switch (String(encoding).toLowerCase()) {
case 'hex':
case 'utf8':
case 'utf-8':
case 'ascii':
case 'latin1':
case 'binary':
case 'base64':
case 'ucs2':
case 'ucs-2':
case 'utf16le':
case 'utf-16le':
return true;
default:
return false;
}
};
Buffer.concat = function concat(list, length) {
if (!Array.isArray(list)) {
throw new TypeError('"list" argument must be an Array of Buffers');
}
if (list.length === 0) {
return Buffer.alloc(0);
}
var i;
if (length === undefined) {
length = 0;
for (i = 0; i < list.length; ++i) {
length += list[i].length;
}
}
var buffer = Buffer.allocUnsafe(length);
var pos = 0;
for (i = 0; i < list.length; ++i) {
var buf = list[i];
if (isInstance(buf, Uint8Array)) {
buf = Buffer.from(buf);
}
if (!Buffer.isBuffer(buf)) {
throw new TypeError('"list" argument must be an Array of Buffers');
}
buf.copy(buffer, pos);
pos += buf.length;
}
return buffer;
};
function byteLength(string, encoding) {
if (Buffer.isBuffer(string)) {
return string.length;
}
if (ArrayBuffer.isView(string) || isInstance(string, ArrayBuffer)) {
return string.byteLength;
}
if (typeof string !== 'string') {
throw new TypeError('The "string" argument must be one of type string, Buffer, or ArrayBuffer. ' + 'Received type ' + _typeof(string));
}
var len = string.length;
var mustMatch = arguments.length > 2 && arguments[2] === true;
if (!mustMatch && len === 0) return 0;
// Use a for loop to avoid recursion
var loweredCase = false;
for (;;) {
switch (encoding) {
case 'ascii':
case 'latin1':
case 'binary':
return len;
case 'utf8':
case 'utf-8':
return utf8ToBytes(string).length;
case 'ucs2':
case 'ucs-2':
case 'utf16le':
case 'utf-16le':
return len * 2;
case 'hex':
return len >>> 1;
case 'base64':
return base64ToBytes(string).length;
default:
if (loweredCase) {
return mustMatch ? -1 : utf8ToBytes(string).length; // assume utf8
}
encoding = ('' + encoding).toLowerCase();
loweredCase = true;
}
}
}
Buffer.byteLength = byteLength;
function slowToString(encoding, start, end) {
var loweredCase = false;
// No need to verify that "this.length <= MAX_UINT32" since it's a read-only
// property of a typed array.
// This behaves neither like String nor Uint8Array in that we set start/end
// to their upper/lower bounds if the value passed is out of range.
// undefined is handled specially as per ECMA-262 6th Edition,
// Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
if (start === undefined || start < 0) {
start = 0;
}
// Return early if start > this.length. Done here to prevent potential uint32
// coercion fail below.
if (start > this.length) {
return '';
}
if (end === undefined || end > this.length) {
end = this.length;
}
if (end <= 0) {
return '';
}
// Force coersion to uint32. This will also coerce falsey/NaN values to 0.
end >>>= 0;
start >>>= 0;
if (end <= start) {
return '';
}
if (!encoding) encoding = 'utf8';
while (true) {
switch (encoding) {
case 'hex':
return hexSlice(this, start, end);
case 'utf8':
case 'utf-8':
return utf8Slice(this, start, end);
case 'ascii':
return asciiSlice(this, start, end);
case 'latin1':
case 'binary':
return latin1Slice(this, start, end);
case 'base64':
return base64Slice(this, start, end);
case 'ucs2':
case 'ucs-2':
case 'utf16le':
case 'utf-16le':
return utf16le