add destroy methods

examples/spreads.html

@@ -20,7 +20,7 @@
   <script>
     var currentSectionIndex = 8;
     // Load the opf
-    var book = ePub("http://localhost:8080/books/1456.epub");
+    var book = ePub("http://localhost:8080/books/moby-dick.epub");
     var rendition = book.renderTo("viewer", {
       width: "100%",
       height: 600
@@ -88,6 +88,11 @@
       console.log(location);
     });
 
+    window.addEventListener("unload", function () {
+      console.log("unloading");
+      this.book.destroy();
+    });
+
   </script>
 
 </body>

src/archive.js

@@ -11,8 +11,10 @@ class Archive {
 
 	constructor() {
 		this.zip = undefined;
-		this.checkRequirements();
 		this.urlCache = {};
+
+		this.checkRequirements();
+
 	}
 
 	/**
@@ -243,6 +245,13 @@ class Archive {
 		var fromCache = this.urlCache[url];
 		if(fromCache) _URL.revokeObjectURL(fromCache);
 	}
+
+	destroy() {
+		this.urlCache.forEach((fromCache) => _URL.revokeObjectURL(fromCache));
+
+		this.zip = undefined;
+		this.urlCache = {};
+	}
 }
 
 export default Archive;

src/container.js

@@ -8,6 +8,10 @@ import {qs} from "./utils/core";
  */
 class Container {
 	constructor(containerDocument) {
+		this.packagePath = '';
+		this.directory = '';
+		this.encoding = '';
+
 		if (containerDocument) {
 			this.parse(containerDocument);
 		}
@@ -35,6 +39,12 @@ class Container {
 		this.directory = path.dirname(this.packagePath);
 		this.encoding = containerDocument.xmlEncoding;
 	}
+
+	destroy() {
+		this.packagePath = undefined;
+		this.directory = undefined;
+		this.encoding = undefined;
+	}
 }
 
 export default Container;

src/locations.js

@@ -23,6 +23,10 @@ class Locations {
 		this.break = 150;
 
 		this._current = 0;
+
+		this.currentLocation = '';
+		this._currentCfi ='';
+		this.processingTimeout = undefined;
 	}
 
 	/**
@@ -76,7 +80,7 @@ class Locations {
 
 				section.unload();
 
-				setTimeout(() => completed.resolve(locations), this.pause);
+				this.processingTimeout = setTimeout(() => completed.resolve(locations), this.pause);
 				return completed.promise;
 			}.bind(this));
 
@@ -257,6 +261,26 @@ class Locations {
 	length () {
 		return this._locations.length;
 	}
+
+	destroy () {
+		this.spine = undefined;
+		this.request = undefined;
+		this.pause = undefined;
+
+		this.q.clear();
+		this.q = undefined;
+		this.epubcfi = undefined;
+
+		this._locations = undefined
+		this.total = undefined;
+
+		this.break = undefined;
+		this._current = undefined;
+
+		this.currentLocation = undefined;
+		this._currentCfi = undefined;
+		clearTimeout(this.processingTimeout);
+	}
 }
 
 EventEmitter(Locations.prototype);

src/packaging.js

@@ -7,6 +7,14 @@ import {qs, qsa, qsp} from "./utils/core";
  */
 class Packaging {
 	constructor(packageDocument) {
+		this.manifest = {};
+		this.navPath = '';
+		this.ncxPath = '';
+		this.coverPath = '';
+		this.spineNodeIndex = 0;
+		this.spine = [];
+		this.metadata = {};
+
 		if (packageDocument) {
 			this.parse(packageDocument);
 		}
@@ -273,6 +281,16 @@ class Packaging {
 
 		return "";
 	}
+
+	destroy() {
+		this.manifest = undefined;
+		this.navPath = undefined;
+		this.ncxPath = undefined;
+		this.coverPath = undefined;
+		this.spineNodeIndex = undefined;
+		this.spine = undefined;
+		this.metadata = undefined;
+	}
 }
 
 export default Packaging;

src/pagelist.js

@@ -17,6 +17,14 @@ class PageList {
 		this.locations = [];
 		this.epubcfi = new EpubCFI();
 
+		this.firstPage = 0;
+		this.lastPage = 0;
+		this.totalPages = 0;
+
+		this.toc = undefined;
+		this.ncx = undefined;
+
+		this.lastPage
 		if (xml) {
 			this.pageList = this.parse(xml);
 		}
@@ -250,6 +258,17 @@ class PageList {
 		var percentage = this.percentageFromPage(pg);
 		return percentage;
 	}
+
+	destroy() {
+		this.pages = undefined;
+		this.locations = undefined;
+		this.epubcfi = undefined;
+
+		this.pageList = undefined;
+
+		this.toc = undefined;
+		this.ncx = undefined;
+	}
 }
 
 export default PageList;

src/rendition.js

@@ -514,8 +514,29 @@ class Rendition {
 	destroy(){
 		// Clear the queue
 		this.q.clear();
+		this.q = undefined;
 
-		this.manager.destroy();
+		this.book = book;
+
+		this.views = null;
+
+		this.hooks.display.clear();
+		this.hooks.serialize.clear();
+		this.hooks.content.clear();
+		this.hooks.layout.clear();
+		this.hooks.render.clear();
+		this.hooks.show.clear();
+		this.hooks = {};
+
+		this.themes.destroy();
+		this.themes = undefined;
+		
+		this.epubcfi = undefined;
+
+		this.starting = undefined;
+		this.started = undefined;
+
+		this.manager && this.manager.destroy();
 	}
 
 	/**

src/resources.js

@@ -27,6 +27,13 @@ class Resources {
 
 		this.replacementUrls = [];
 
+		this.html = [];
+		this.assets = [];
+		this.css = [];
+
+		this.urls = [];
+		this.cssUrls = [];
+
 		this.split();
 		this.splitUrls();
 	}
@@ -259,6 +266,19 @@ class Resources {
 		}
 		return substitute(content, relUrls, this.replacementUrls);
 	}
+
+	destroy() {
+		this.settings = undefined;
+		this.manifest = undefined;
+		this.resources = undefined;
+		this.replacementUrls = undefined;
+		this.html = undefined;
+		this.assets = undefined;
+		this.css = undefined;
+
+		this.urls = undefined;
+		this.cssUrls = undefined;
+	}
 }
 
 export default Resources;

src/section.js

@@ -171,11 +171,32 @@ class Section {
 		return new EpubCFI(el, this.cfiBase).toString();
 	}
 
+	/**
+	 * Unload the section document
+	 */
 	unload() {
 		this.document = undefined;
 		this.contents = undefined;
 		this.output = undefined;
 	}
+
+	destroy() {
+		this.unload();
+		this.hooks.serialize.clear();
+		this.hooks.content.clear();
+
+		this.hooks = undefined;
+		this.idref = undefined;
+		this.linear = undefined;
+		this.properties = undefined;
+		this.index = undefined;
+		this.href = undefined;
+		this.url = undefined;
+		this.next = undefined;
+		this.prev = undefined;
+
+		this.cfiBase = undefined;
+	}
 }
 
 export default Section;

src/spine.js

@@ -23,6 +23,12 @@ class Spine {
 		this.epubcfi = new EpubCFI();
 
 		this.loaded = false;
+
+		this.items = undefined;
+		this.manifest = undefined;
+		this.spineNodeIndex = undefined;
+		this.baseUrl = undefined;
+		this.length = undefined;
 	}
 
 	/**
@@ -158,7 +164,25 @@ class Spine {
 	}
 
 	destroy() {
+		this.each((section) => section.destroy());
 
+		this.spineItems = undefined
+		this.spineByHref = undefined
+		this.spineById = undefined
+
+		this.hooks.serialize.clear();
+		this.hooks.content.clear();
+		this.hooks = undefined;
+
+		this.epubcfi = undefined;
+
+		this.loaded = false;
+
+		this.items = undefined;
+		this.manifest = undefined;
+		this.spineNodeIndex = undefined;
+		this.baseUrl = undefined;
+		this.length = undefined;
 	}
 }
 

src/themes.js

@@ -151,6 +151,14 @@ class Themes {
 		this.override("font-size", size);
 	}
 
+	destroy() {
+		this.rendition = undefined;
+		this._themes = undefined;
+		this._overrides = undefined;
+		this._current = undefined;
+		this._injected = undefined;
+	}
+
 }
 
 export default Themes;