all files / src/ util.js

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91.67% Branches 22/24
93.33% Functions 14/15
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'use strict';
 
exports.__esModule = true;
exports.extend = extend;
exports.clone = clone;
exports.memoize = memoize;
exports.delve = delve;
exports.toArray = toArray;
exports.isFunction = isFunction;
exports.isString = isString;
exports.empty = empty;
exports.falsey = falsey;
exports.styleObjToCss = styleObjToCss;
exports.hashToClassName = hashToClassName;
 
var _constants = require('./constants');
 
/** Copy own-properties from `props` onto `obj`.
 *	@returns obj
 *	@private
 */
 
function extend(obj, props) {
	if (props) for (var i in props) {
		obj[i] = props[i];
	}return obj;
}
 
/** Fast clone. Note: does not filter out non-own properties.
 *	@see https://esbench.com/bench/56baa34f45df6895002e03b6
 */
 
function clone(obj) {
	return extend({}, obj);
}
 
/** Create a caching wrapper for the given function.
 *	Note: As this method is only used for memoizing string operations, it does not safeguard against Object.prototype manipulation.
 *	@private
 */
 
function memoize(fn) {
	var mem = {};
	return function (k) {
		return mem[k] || (mem[k] = fn(k));
	};
}
 
/** Get a deep property value from the given object, expressed in dot-notation.
 *	@private
 */
 
function delve(obj, key) {
	for (var p = key.split('.'), i = 0; i < p.length && obj; i++) {
		obj = obj[p[i]];
	}
	return obj;
}
 
/** Convert an Array-like object to an Array
 *	@private
 */
 
function toArray(obj, offset) {
	return [].slice.call(obj, offset);
}
 
/** @private is the given object a Function? */
 
function isFunction(obj) {
	return 'function' === typeof obj;
}
 
/** @private is the given object a String? */
 
function isString(obj) {
	return 'string' === typeof obj;
}
 
/** Check if a value is `null` or `undefined`.
 *	@private
 */
 
function empty(x) {
	return x === undefined || x === null;
}
 
/** Check if a value is `null`, `undefined`, or explicitly `false`. */
 
function falsey(value) {
	return value === false || empty(value);
}
 
/** Convert a hashmap of styles to CSSText
 *	@private
 */
 
function styleObjToCss(s) {
	var str = '';
	for (var prop in s) {
		var val = s[prop];
		Eif (!empty(val)) {
			if (str) str += ' ';
			str += jsToCss(prop);
			str += ': ';
			str += val;
			if (typeof val === 'number' && !_constants.NON_DIMENSION_PROPS[prop]) {
				str += 'px';
			}
			str += ';';
		}
	}
	return str;
}
 
/** Convert a hashmap of CSS classes to a space-delimited className string
 *	@private
 */
 
function hashToClassName(c) {
	var str = '';
	for (var prop in c) {
		if (c[prop]) {
			if (str) str += ' ';
			str += prop;
		}
	}
	return str;
}
 
/** Convert a JavaScript camel-case CSS property name to a CSS property name
 *	@private
 *	@function
 */
var jsToCss = memoize(function (s) {
	return toLowerCase(s.replace(/([A-Z])/g, '-$1'));
});
 
exports.jsToCss = jsToCss;
/** Just a memoized String.prototype.toLowerCase */
var toLowerCase = memoize(function (s) {
	return s.toLowerCase();
});
 
exports.toLowerCase = toLowerCase;
// For animations, rAF is vastly superior. However, it scores poorly on benchmarks :(
// export const setImmediate = typeof requestAnimationFrame==='function' ? requestAnimationFrame : setTimeout;
 
var ch = undefined;
try {
	ch = new MessageChannel();
} catch (e) {}
 
/** Call a function asynchronously, as soon as possible.
 *	@param {Function} callback
 */
var setImmediate = ch ? function (f) {
	ch.port1.onmessage = f;
	ch.port2.postMessage(_constants.EMPTY_BASE);
} : setTimeout;
exports.setImmediate = setImmediate;