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export function resolveUrl(url, baseUrl) {
// url is absolute already
if (url.match(/^[a-z]+:\/\//i)) {
return url;
}
// url is absolute already, without protocol
if (url.match(/^\/\//)) {
return window.location.protocol + url;
}
// dataURI, mailto:, tel:, etc.
if (url.match(/^[a-z]+:/i)) {
return url;
}
const doc = document.implementation.createHTMLDocument();
const base = doc.createElement('base');
const a = doc.createElement('a');
doc.head.appendChild(base);
doc.body.appendChild(a);
if (baseUrl) {
base.href = baseUrl;
}
a.href = url;
return a.href;
}
export const uuid = (() => {
// generate uuid for className of pseudo elements.
// We should not use GUIDs, otherwise pseudo elements sometimes cannot be captured.
let counter = 0;
// ref: http://stackoverflow.com/a/6248722/2519373
const random = () =>
// eslint-disable-next-line no-bitwise
`0000${((Math.random() * 36 ** 4) << 0).toString(36)}`.slice(-4);
return () => {
counter += 1;
return `u${random()}${counter}`;
};
})();
export function delay(ms) {
return (args) => new Promise((resolve) => {
setTimeout(() => resolve(args), ms);
});
}
export function toArray(arrayLike) {
const arr = [];
for (let i = 0, l = arrayLike.length; i < l; i++) {
arr.push(arrayLike[i]);
}
return arr;
}
function px(node, styleProperty) {
const win = node.ownerDocument.defaultView || window;
const val = win.getComputedStyle(node).getPropertyValue(styleProperty);
return val ? parseFloat(val.replace('px', '')) : 0;
}
function getNodeWidth(node) {
const leftBorder = px(node, 'border-left-width');
const rightBorder = px(node, 'border-right-width');
return node.clientWidth + leftBorder + rightBorder;
}
function getNodeHeight(node) {
const topBorder = px(node, 'border-top-width');
const bottomBorder = px(node, 'border-bottom-width');
return node.clientHeight + topBorder + bottomBorder;
}
export function getImageSize(targetNode, options = {}) {
const width = options.width || getNodeWidth(targetNode);
const height = options.height || getNodeHeight(targetNode);
return { width, height };
}
export function getPixelRatio() {
let ratio;
let FINAL_PROCESS;
try {
FINAL_PROCESS = process;
}
catch (e) {
// pass
}
const val = FINAL_PROCESS && FINAL_PROCESS.env
? FINAL_PROCESS.env.devicePixelRatio
: null;
if (val) {
ratio = parseInt(val, 10);
if (Number.isNaN(ratio)) {
ratio = 1;
}
}
return ratio || window.devicePixelRatio || 1;
}
// @see https://developer.mozilla.org/en-US/docs/Web/HTML/Element/canvas#maximum_canvas_size
const canvasDimensionLimit = 16384;
export function checkCanvasDimensions(canvas) {
if (canvas.width > canvasDimensionLimit ||
canvas.height > canvasDimensionLimit) {
if (canvas.width > canvasDimensionLimit &&
canvas.height > canvasDimensionLimit) {
if (canvas.width > canvas.height) {
canvas.height *= canvasDimensionLimit / canvas.width;
canvas.width = canvasDimensionLimit;
}
else {
canvas.width *= canvasDimensionLimit / canvas.height;
canvas.height = canvasDimensionLimit;
}
}
else if (canvas.width > canvasDimensionLimit) {
canvas.height *= canvasDimensionLimit / canvas.width;
canvas.width = canvasDimensionLimit;
}
else {
canvas.width *= canvasDimensionLimit / canvas.height;
canvas.height = canvasDimensionLimit;
}
}
}
export function canvasToBlob(canvas, options = {}) {
if (canvas.toBlob) {
return new Promise((resolve) => {
canvas.toBlob(resolve, options.type ? options.type : 'image/png', options.quality ? options.quality : 1);
});
}
return new Promise((resolve) => {
const binaryString = window.atob(canvas
.toDataURL(options.type ? options.type : undefined, options.quality ? options.quality : undefined)
.split(',')[1]);
const len = binaryString.length;
const binaryArray = new Uint8Array(len);
for (let i = 0; i < len; i += 1) {
binaryArray[i] = binaryString.charCodeAt(i);
}
resolve(new Blob([binaryArray], {
type: options.type ? options.type : 'image/png',
}));
});
}
export function createImage(url) {
return new Promise((resolve, reject) => {
const img = new Image();
img.decode = () => resolve(img);
img.onload = () => resolve(img);
img.onerror = reject;
img.crossOrigin = 'anonymous';
img.decoding = 'async';
img.src = url;
});
}
export async function svgToDataURL(svg) {
return Promise.resolve()
.then(() => new XMLSerializer().serializeToString(svg))
.then(encodeURIComponent)
.then((html) => `data:image/svg+xml;charset=utf-8,${html}`);
}
export async function nodeToDataURL(node, width, height) {
const xmlns = 'http://www.w3.org/2000/svg';
const svg = document.createElementNS(xmlns, 'svg');
const foreignObject = document.createElementNS(xmlns, 'foreignObject');
svg.setAttribute('width', `${width}`);
svg.setAttribute('height', `${height}`);
svg.setAttribute('viewBox', `0 0 ${width} ${height}`);
foreignObject.setAttribute('width', '100%');
foreignObject.setAttribute('height', '100%');
foreignObject.setAttribute('x', '0');
foreignObject.setAttribute('y', '0');
foreignObject.setAttribute('externalResourcesRequired', 'true');
svg.appendChild(foreignObject);
foreignObject.appendChild(node);
return svgToDataURL(svg);
}
export const isInstanceOfElement = (node, instance) => {
if (node instanceof instance)
return true;
const nodePrototype = Object.getPrototypeOf(node);
if (nodePrototype === null)
return false;
return (nodePrototype.constructor.name === instance.name ||
isInstanceOfElement(nodePrototype, instance));
};
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