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utilities.js
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utilities.js
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// RegExps
const REGEXP_DATA_URL_HEAD = /^data:([^;]+);base64,/;
const REGEXP_HYPHENATE = /([a-z\d])([A-Z])/g;
const REGEXP_ORIGINS = /^(https?:)\/\/([^:/?#]+):?(\d*)/i;
const REGEXP_SPACES = /\s+/;
const REGEXP_SUFFIX = /^(width|height|left|top|marginLeft|marginTop)$/;
const REGEXP_TRIM = /^\s+(.*)\s+$/;
const REGEXP_USERAGENT = /(Macintosh|iPhone|iPod|iPad).*AppleWebKit/i;
// Utilities
const navigator = typeof window !== 'undefined' ? window.navigator : null;
const IS_SAFARI_OR_UIWEBVIEW = navigator && REGEXP_USERAGENT.test(navigator.userAgent);
const objectProto = Object.prototype;
const toString = objectProto.toString;
const hasOwnProperty = objectProto.hasOwnProperty;
const slice = Array.prototype.slice;
const fromCharCode = String.fromCharCode;
export function typeOf(obj) {
return toString.call(obj).slice(8, -1).toLowerCase();
}
export function isNumber(num) {
return typeof num === 'number' && !isNaN(num);
}
export function isUndefined(obj) {
return typeof obj === 'undefined';
}
export function isObject(obj) {
return typeof obj === 'object' && obj !== null;
}
export function isPlainObject(obj) {
if (!isObject(obj)) {
return false;
}
try {
const constructor = obj.constructor;
const prototype = constructor.prototype;
return constructor && prototype && hasOwnProperty.call(prototype, 'isPrototypeOf');
} catch (e) {
return false;
}
}
export function isFunction(fn) {
return typeOf(fn) === 'function';
}
export function isArray(arr) {
return Array.isArray ? Array.isArray(arr) : typeOf(arr) === 'array';
}
export function toArray(obj, offset) {
offset = offset >= 0 ? offset : 0;
if (Array.from) {
return Array.from(obj).slice(offset);
}
return slice.call(obj, offset);
}
export function trim(str) {
if (typeof str === 'string') {
str = str.trim ? str.trim() : str.replace(REGEXP_TRIM, '$1');
}
return str;
}
export function each(obj, callback) {
if (obj && isFunction(callback)) {
let i;
if (isArray(obj) || isNumber(obj.length)/* array-like */) {
const length = obj.length;
for (i = 0; i < length; i++) {
if (callback.call(obj, obj[i], i, obj) === false) {
break;
}
}
} else if (isObject(obj)) {
Object.keys(obj).forEach((key) => {
callback.call(obj, obj[key], key, obj);
});
}
}
return obj;
}
export function extend(obj, ...args) {
if (isObject(obj) && args.length > 0) {
if (Object.assign) {
return Object.assign(obj, ...args);
}
args.forEach((arg) => {
if (isObject(arg)) {
Object.keys(arg).forEach((key) => {
obj[key] = arg[key];
});
}
});
}
return obj;
}
export function proxy(fn, context, ...args) {
return (...args2) => {
return fn.apply(context, args.concat(args2));
};
}
export function setStyle(element, styles) {
const style = element.style;
each(styles, (value, property) => {
if (REGEXP_SUFFIX.test(property) && isNumber(value)) {
value += 'px';
}
style[property] = value;
});
}
export function hasClass(element, value) {
return element.classList ?
element.classList.contains(value) :
element.className.indexOf(value) > -1;
}
export function addClass(element, value) {
if (!value) {
return;
}
if (isNumber(element.length)) {
each(element, (elem) => {
addClass(elem, value);
});
return;
}
if (element.classList) {
element.classList.add(value);
return;
}
const className = trim(element.className);
if (!className) {
element.className = value;
} else if (className.indexOf(value) < 0) {
element.className = `${className} ${value}`;
}
}
export function removeClass(element, value) {
if (!value) {
return;
}
if (isNumber(element.length)) {
each(element, (elem) => {
removeClass(elem, value);
});
return;
}
if (element.classList) {
element.classList.remove(value);
return;
}
if (element.className.indexOf(value) >= 0) {
element.className = element.className.replace(value, '');
}
}
export function toggleClass(element, value, added) {
if (!value) {
return;
}
if (isNumber(element.length)) {
each(element, (elem) => {
toggleClass(elem, value, added);
});
return;
}
// IE10-11 doesn't support the second parameter of `classList.toggle`
if (added) {
addClass(element, value);
} else {
removeClass(element, value);
}
}
export function hyphenate(str) {
return str.replace(REGEXP_HYPHENATE, '$1-$2').toLowerCase();
}
export function getData(element, name) {
if (isObject(element[name])) {
return element[name];
} else if (element.dataset) {
return element.dataset[name];
}
return element.getAttribute(`data-${hyphenate(name)}`);
}
export function setData(element, name, data) {
if (isObject(data)) {
element[name] = data;
} else if (element.dataset) {
element.dataset[name] = data;
} else {
element.setAttribute(`data-${hyphenate(name)}`, data);
}
}
export function removeData(element, name) {
if (isObject(element[name])) {
delete element[name];
} else if (element.dataset) {
// #128 Safari not allows to delete dataset property
try {
delete element.dataset[name];
} catch (e) {
element.dataset[name] = null;
}
} else {
element.removeAttribute(`data-${hyphenate(name)}`);
}
}
export function removeListener(element, type, handler) {
const types = trim(type).split(REGEXP_SPACES);
if (types.length > 1) {
each(types, (t) => {
removeListener(element, t, handler);
});
return;
}
if (element.removeEventListener) {
element.removeEventListener(type, handler, false);
} else if (element.detachEvent) {
element.detachEvent(`on${type}`, handler);
}
}
export function addListener(element, type, handler, once) {
const types = trim(type).split(REGEXP_SPACES);
const originalHandler = handler;
if (types.length > 1) {
each(types, (t) => {
addListener(element, t, handler);
});
return;
}
if (once) {
handler = (...args) => {
removeListener(element, type, handler);
return originalHandler.apply(element, args);
};
}
if (element.addEventListener) {
element.addEventListener(type, handler, false);
} else if (element.attachEvent) {
element.attachEvent(`on${type}`, handler);
}
}
export function dispatchEvent(element, type, data) {
if (element.dispatchEvent) {
let event;
// Event and CustomEvent on IE9-11 are global objects, not constructors
if (isFunction(Event) && isFunction(CustomEvent)) {
if (isUndefined(data)) {
event = new Event(type, {
bubbles: true,
cancelable: true,
});
} else {
event = new CustomEvent(type, {
detail: data,
bubbles: true,
cancelable: true,
});
}
} else if (isUndefined(data)) {
event = document.createEvent('Event');
event.initEvent(type, true, true);
} else {
event = document.createEvent('CustomEvent');
event.initCustomEvent(type, true, true, data);
}
// IE9+
return element.dispatchEvent(event);
} else if (element.fireEvent) {
// IE6-10 (native events only)
return element.fireEvent(`on${type}`);
}
return true;
}
export function getEvent(event) {
const e = event || window.event;
// Fix target property (IE8)
if (!e.target) {
e.target = e.srcElement || document;
}
if (!isNumber(e.pageX) && isNumber(e.clientX)) {
const eventDoc = event.target.ownerDocument || document;
const doc = eventDoc.documentElement;
const body = eventDoc.body;
e.pageX = e.clientX + (
((doc && doc.scrollLeft) || (body && body.scrollLeft) || 0) -
((doc && doc.clientLeft) || (body && body.clientLeft) || 0)
);
e.pageY = e.clientY + (
((doc && doc.scrollTop) || (body && body.scrollTop) || 0) -
((doc && doc.clientTop) || (body && body.clientTop) || 0)
);
}
return e;
}
export function getOffset(element) {
const doc = document.documentElement;
const box = element.getBoundingClientRect();
return {
left: box.left + (
(window.scrollX || (doc && doc.scrollLeft) || 0) - ((doc && doc.clientLeft) || 0)
),
top: box.top + (
(window.scrollY || (doc && doc.scrollTop) || 0) - ((doc && doc.clientTop) || 0)
),
};
}
export function getByTag(element, tagName) {
return element.getElementsByTagName(tagName);
}
export function getByClass(element, className) {
return element.getElementsByClassName ?
element.getElementsByClassName(className) :
element.querySelectorAll(`.${className}`);
}
export function createElement(tagName) {
return document.createElement(tagName);
}
export function appendChild(element, elem) {
element.appendChild(elem);
}
export function removeChild(element) {
if (element.parentNode) {
element.parentNode.removeChild(element);
}
}
export function empty(element) {
while (element.firstChild) {
element.removeChild(element.firstChild);
}
}
export function isCrossOriginURL(url) {
const parts = url.match(REGEXP_ORIGINS);
return parts && (
parts[1] !== location.protocol ||
parts[2] !== location.hostname ||
parts[3] !== location.port
);
}
export function addTimestamp(url) {
const timestamp = `timestamp=${(new Date()).getTime()}`;
return (url + (url.indexOf('?') === -1 ? '?' : '&') + timestamp);
}
export function getImageSize(image, callback) {
// Modern browsers (ignore Safari)
if (image.naturalWidth && !IS_SAFARI_OR_UIWEBVIEW) {
callback(image.naturalWidth, image.naturalHeight);
return;
}
// IE8: Don't use `new Image()` here
const newImage = createElement('img');
newImage.onload = function load() {
callback(this.width, this.height);
};
newImage.src = image.src;
}
export function getTransforms(data) {
const transforms = [];
const translateX = data.translateX;
const translateY = data.translateY;
const rotate = data.rotate;
const scaleX = data.scaleX;
const scaleY = data.scaleY;
if (isNumber(translateX) && translateX !== 0) {
transforms.push(`translateX(${translateX}px)`);
}
if (isNumber(translateY) && translateY !== 0) {
transforms.push(`translateY(${translateY}px)`);
}
// Rotate should come first before scale to match orientation transform
if (isNumber(rotate) && rotate !== 0) {
transforms.push(`rotate(${rotate}deg)`);
}
if (isNumber(scaleX) && scaleX !== 1) {
transforms.push(`scaleX(${scaleX})`);
}
if (isNumber(scaleY) && scaleY !== 1) {
transforms.push(`scaleY(${scaleY})`);
}
const transform = transforms.length ? transforms.join(' ') : 'none';
return {
WebkitTransform: transform,
msTransform: transform,
transform,
};
}
export function getRotatedSizes(data, reversed) {
const deg = Math.abs(data.degree) % 180;
const arc = ((deg > 90 ? (180 - deg) : deg) * Math.PI) / 180;
const sinArc = Math.sin(arc);
const cosArc = Math.cos(arc);
const width = data.width;
const height = data.height;
const aspectRatio = data.aspectRatio;
let newWidth;
let newHeight;
if (!reversed) {
newWidth = (width * cosArc) + (height * sinArc);
newHeight = (width * sinArc) + (height * cosArc);
} else {
newWidth = width / (cosArc + (sinArc / aspectRatio));
newHeight = newWidth / aspectRatio;
}
return {
width: newWidth,
height: newHeight,
};
}
export function getSourceCanvas(image, data) {
const canvas = createElement('canvas');
const context = canvas.getContext('2d');
let dstX = 0;
let dstY = 0;
const dstWidth = data.naturalWidth;
const dstHeight = data.naturalHeight;
const rotate = data.rotate;
const scaleX = data.scaleX;
const scaleY = data.scaleY;
const scalable = isNumber(scaleX) && isNumber(scaleY) && (scaleX !== 1 || scaleY !== 1);
const rotatable = isNumber(rotate) && rotate !== 0;
const advanced = rotatable || scalable;
let canvasWidth = dstWidth * Math.abs(scaleX || 1);
let canvasHeight = dstHeight * Math.abs(scaleY || 1);
let translateX;
let translateY;
let rotated;
if (scalable) {
translateX = canvasWidth / 2;
translateY = canvasHeight / 2;
}
if (rotatable) {
rotated = getRotatedSizes({
width: canvasWidth,
height: canvasHeight,
degree: rotate,
});
canvasWidth = rotated.width;
canvasHeight = rotated.height;
translateX = canvasWidth / 2;
translateY = canvasHeight / 2;
}
canvas.width = canvasWidth;
canvas.height = canvasHeight;
if (advanced) {
dstX = -dstWidth / 2;
dstY = -dstHeight / 2;
context.save();
context.translate(translateX, translateY);
}
// Rotate should come first before scale as in the "getTransform" function
if (rotatable) {
context.rotate((rotate * Math.PI) / 180);
}
if (scalable) {
context.scale(scaleX, scaleY);
}
context.drawImage(
image,
Math.floor(dstX),
Math.floor(dstY),
Math.floor(dstWidth),
Math.floor(dstHeight)
);
if (advanced) {
context.restore();
}
return canvas;
}
export function getStringFromCharCode(dataView, start, length) {
let str = '';
let i = start;
for (length += start; i < length; i++) {
str += fromCharCode(dataView.getUint8(i));
}
return str;
}
export function getOrientation(arrayBuffer) {
const dataView = new DataView(arrayBuffer);
let length = dataView.byteLength;
let orientation;
let exifIDCode;
let tiffOffset;
let firstIFDOffset;
let littleEndian;
let endianness;
let app1Start;
let ifdStart;
let offset;
let i;
// Only handle JPEG image (start by 0xFFD8)
if (dataView.getUint8(0) === 0xFF && dataView.getUint8(1) === 0xD8) {
offset = 2;
while (offset < length) {
if (dataView.getUint8(offset) === 0xFF && dataView.getUint8(offset + 1) === 0xE1) {
app1Start = offset;
break;
}
offset++;
}
}
if (app1Start) {
exifIDCode = app1Start + 4;
tiffOffset = app1Start + 10;
if (getStringFromCharCode(dataView, exifIDCode, 4) === 'Exif') {
endianness = dataView.getUint16(tiffOffset);
littleEndian = endianness === 0x4949;
if (littleEndian || endianness === 0x4D4D /* bigEndian */) {
if (dataView.getUint16(tiffOffset + 2, littleEndian) === 0x002A) {
firstIFDOffset = dataView.getUint32(tiffOffset + 4, littleEndian);
if (firstIFDOffset >= 0x00000008) {
ifdStart = tiffOffset + firstIFDOffset;
}
}
}
}
}
if (ifdStart) {
length = dataView.getUint16(ifdStart, littleEndian);
for (i = 0; i < length; i++) {
offset = ifdStart + (i * 12) + 2;
if (dataView.getUint16(offset, littleEndian) === 0x0112 /* Orientation */) {
// 8 is the offset of the current tag's value
offset += 8;
// Get the original orientation value
orientation = dataView.getUint16(offset, littleEndian);
// Override the orientation with its default value for Safari
if (IS_SAFARI_OR_UIWEBVIEW) {
dataView.setUint16(offset, 1, littleEndian);
}
break;
}
}
}
return orientation;
}
export function dataURLToArrayBuffer(dataURL) {
const base64 = dataURL.replace(REGEXP_DATA_URL_HEAD, '');
const binary = atob(base64);
const length = binary.length;
const arrayBuffer = new ArrayBuffer(length);
const dataView = new Uint8Array(arrayBuffer);
let i;
for (i = 0; i < length; i++) {
dataView[i] = binary.charCodeAt(i);
}
return arrayBuffer;
}
// Only available for JPEG image
export function arrayBufferToDataURL(arrayBuffer) {
const dataView = new Uint8Array(arrayBuffer);
const length = dataView.length;
let base64 = '';
let i;
for (i = 0; i < length; i++) {
base64 += fromCharCode(dataView[i]);
}
return `data:image/jpeg;base64,${btoa(base64)}`;
}