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// ==========================================================================
// Type checking utils
// ==========================================================================
const getConstructor = input => (input !== null && typeof input !== 'undefined' ? input.constructor : null);
const instanceOf = (input, constructor) => Boolean(input && constructor && input instanceof constructor);
const is = {
object(input) {
return getConstructor(input) === Object;
},
number(input) {
return getConstructor(input) === Number && !Number.isNaN(input);
},
string(input) {
return getConstructor(input) === String;
},
boolean(input) {
return getConstructor(input) === Boolean;
},
function(input) {
return getConstructor(input) === Function;
},
array(input) {
return !is.nullOrUndefined(input) && Array.isArray(input);
},
weakMap(input) {
return instanceOf(input, WeakMap);
},
nodeList(input) {
return instanceOf(input, NodeList);
},
element(input) {
return instanceOf(input, Element);
},
textNode(input) {
return getConstructor(input) === Text;
},
event(input) {
return instanceOf(input, Event);
},
cue(input) {
return instanceOf(input, window.TextTrackCue) || instanceOf(input, window.VTTCue);
},
track(input) {
return instanceOf(input, TextTrack) || (!is.nullOrUndefined(input) && is.string(input.kind));
},
url(input) {
return (
!is.nullOrUndefined(input) &&
/(ftp|http|https):\/\/(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-/]))?/.test(input)
);
},
nullOrUndefined(input) {
return input === null || typeof input === 'undefined';
},
empty(input) {
return (
is.nullOrUndefined(input) ||
((is.string(input) || is.array(input) || is.nodeList(input)) && !input.length) ||
(is.object(input) && !Object.keys(input).length)
);
},
};
export default is;
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