asteroid/reader/resources/scripts/polyfills/intersection-observer.js

/*!
 *
 *  # Polyfill for Bibi: IntersectionObserver polyfill
 *
 *  * Consists of:
 *      - IntersectionObserver polyfill : © W3C - https://github.com/w3c/IntersectionObserver / Licensed under the W3C Software and Document License - https://www.w3.org/Consortium/Legal/2015/copyright-software-and-document
 *
 */!function(t){var e={};function n(o){if(e[o])return e[o].exports;var i=e[o]={i:o,l:!1,exports:{}};return t[o].call(i.exports,i,i.exports,n),i.l=!0,i.exports}n.m=t,n.c=e,n.d=function(t,e,o){n.o(t,e)||Object.defineProperty(t,e,{enumerable:!0,get:o})},n.r=function(t){"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(t,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(t,"__esModule",{value:!0})},n.t=function(t,e){if(1&e&&(t=n(t)),8&e)return t;if(4&e&&"object"==typeof t&&t&&t.__esModule)return t;var o=Object.create(null);if(n.r(o),Object.defineProperty(o,"default",{enumerable:!0,value:t}),2&e&&"string"!=typeof t)for(var i in t)n.d(o,i,function(e){return t[e]}.bind(null,i));return o},n.n=function(t){var e=t&&t.__esModule?function(){return t.default}:function(){return t};return n.d(e,"a",e),e},n.o=function(t,e){return Object.prototype.hasOwnProperty.call(t,e)},n.p="",n(n.s=42)}({42:function(t,e,n){"use strict";n.r(e);n(8)},8:function(t,e){function n(t){return(n="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(t){return typeof t}:function(t){return t&&"function"==typeof Symbol&&t.constructor===Symbol&&t!==Symbol.prototype?"symbol":typeof t})(t)}!function(){"use strict";if("object"===("undefined"==typeof window?"undefined":n(window)))if("IntersectionObserver"in window&&"IntersectionObserverEntry"in window&&"intersectionRatio"in window.IntersectionObserverEntry.prototype)"isIntersecting"in window.IntersectionObserverEntry.prototype||Object.defineProperty(window.IntersectionObserverEntry.prototype,"isIntersecting",{get:function(){return this.intersectionRatio>0}});else{var t=function(t){for(var e=window.document,n=r(e);n;)n=r(e=n.ownerDocument);return e}(),e=[],o=null,i=null;u.prototype.THROTTLE_TIMEOUT=100,u.prototype.POLL_INTERVAL=null,u.prototype.USE_MUTATION_OBSERVER=!0,u._setupCrossOriginUpdater=function(){return o||(o=function(t,n){i=t&&n?f(t,n):{top:0,bottom:0,left:0,right:0,width:0,height:0},e.forEach((function(t){t._checkForIntersections()}))}),o},u._resetCrossOriginUpdater=function(){o=null,i=null},u.prototype.observe=function(t){if(!this._observationTargets.some((function(e){return e.element==t}))){if(!t||1!=t.nodeType)throw new Error("target must be an Element");this._registerInstance(),this._observationTargets.push({element:t,entry:null}),this._monitorIntersections(t.ownerDocument),this._checkForIntersections()}},u.prototype.unobserve=function(t){this._observationTargets=this._observationTargets.filter((function(e){return e.element!=t})),this._unmonitorIntersections(t.ownerDocument),0==this._observationTargets.length&&this._unregisterInstance()},u.prototype.disconnect=function(){this._observationTargets=[],this._unmonitorAllIntersections(),this._unregisterInstance()},u.prototype.takeRecords=function(){var t=this._queuedEntries.slice();return this._queuedEntries=[],t},u.prototype._initThresholds=function(t){var e=t||[0];return Array.isArray(e)||(e=[e]),e.sort().filter((function(t,e,n){if("number"!=typeof t||isNaN(t)||t<0||t>1)throw new Error("threshold must be a number between 0 and 1 inclusively");return t!==n[e-1]}))},u.prototype._parseRootMargin=function(t){var e=(t||"0px").split(/\s+/).map((function(t){var e=/^(-?\d*\.?\d+)(px|%)$/.exec(t);if(!e)throw new Error("rootMargin must be specified in pixels or percent");return{value:parseFloat(e[1]),unit:e[2]}}));return e[1]=e[1]||e[0],e[2]=e[2]||e[0],e[3]=e[3]||e[1],e},u.prototype._monitorIntersections=function(e){var n=e.defaultView;if(n&&-1==this._monitoringDocuments.indexOf(e)){var o=this._checkForIntersections,i=null,s=null;if(this.POLL_INTERVAL?i=n.setInterval(o,this.POLL_INTERVAL):(h(n,"resize",o,!0),h(e,"scroll",o,!0),this.USE_MUTATION_OBSERVER&&"MutationObserver"in n&&(s=new n.MutationObserver(o)).observe(e,{attributes:!0,childList:!0,characterData:!0,subtree:!0})),this._monitoringDocuments.push(e),this._monitoringUnsubscribes.push((function(){var t=e.defaultView;t&&(i&&t.clearInterval(i),c(t,"resize",o,!0)),c(e,"scroll",o,!0),s&&s.disconnect()})),e!=(this.root&&this.root.ownerDocument||t)){var u=r(e);u&&this._mo