/**
* Browser detection.
* @module browser
* @license MIT
*
* @copyright 2010 Jeff Schiller, 2010 Alexis Deveria
*/
const NSSVG = 'http://www.w3.org/2000/svg';
const { userAgent } = navigator;
// Note: Browser sniffing should only be used if no other detection method is possible
const isWebkit_ = userAgent.includes('AppleWebKit');
const isGecko_ = userAgent.includes('Gecko/');
const isChrome_ = userAgent.includes('Chrome/');
const isMac_ = userAgent.includes('Macintosh');
const isTouch_ = 'ontouchstart' in window;
// text character positioning (for IE9 and now Chrome)
const supportsGoodTextCharPos_ = (function () {
const svgroot = document.createElementNS(NSSVG, 'svg');
const svgcontent = document.createElementNS(NSSVG, 'svg');
document.documentElement.append(svgroot);
svgcontent.setAttribute('x', 5);
svgroot.append(svgcontent);
const text = document.createElementNS(NSSVG, 'text');
text.textContent = 'a';
svgcontent.append(text);
try { // Chrome now fails here
const pos = text.getStartPositionOfChar(0).x;
return (pos === 0);
} catch (err) {
return false;
} finally {
svgroot.remove();
}
}());
// Support for correct bbox sizing on groups with horizontal/vertical lines
const supportsHVLineContainerBBox_ = (function () {
const svgcontent = document.createElementNS(NSSVG, 'svg');
document.documentElement.append(svgcontent);
const path = document.createElementNS(NSSVG, 'path');
path.setAttribute('d', 'M0,0 10,0');
const path2 = document.createElementNS(NSSVG, 'path');
path2.setAttribute('d', 'M5,0 15,0');
const g = document.createElementNS(NSSVG, 'g');
g.append(path, path2);
svgcontent.append(g);
const bbox = g.getBBox();
svgcontent.remove();
// Webkit gives 0, FF gives 10, Opera (correctly) gives 15
return (bbox.width === 15);
}());
const supportsNonScalingStroke_ = (function () {
const rect = document.createElementNS(NSSVG, 'rect');
rect.setAttribute('style', 'vector-effect:non-scaling-stroke');
return rect.style.vectorEffect === 'non-scaling-stroke';
}());
// Public API
/**
* @function module:browser.isWebkit
* @returns {boolean}
*/
export const isWebkit = () => isWebkit_;
/**
* @function module:browser.isGecko
* @returns {boolean}
*/
export const isGecko = () => isGecko_;
/**
* @function module:browser.isChrome
* @returns {boolean}
*/
export const isChrome = () => isChrome_;
/**
* @function module:browser.isMac
* @returns {boolean}
*/
export const isMac = () => isMac_;
/**
* @function module:browser.isTouch
* @returns {boolean}
*/
export const isTouch = () => isTouch_;
/**
* @function module:browser.supportsHVLineContainerBBox
* @returns {boolean}
*/
export const supportsHVLineContainerBBox = () => supportsHVLineContainerBBox_;
/**
* @function module:browser.supportsGoodTextCharPos
* @returns {boolean}
*/
export const supportsGoodTextCharPos = () => supportsGoodTextCharPos_;
/**
* @function module:browser.supportsNonScalingStroke
* @returns {boolean}
*/
export const supportsNonScalingStroke = () => supportsNonScalingStroke_;