Add landmark parsing

src/navigation.js

@@ -7,6 +7,7 @@ import {qs, qsa, querySelectorByType, filterChildren, getParentByTagName} from "
 class Navigation {
 	constructor(xml) {
 		this.toc = [];
+		this.landmarks = [];
 		this.tocByHref = {};
 		this.tocById = {};
 		this.length = 0;
@@ -33,6 +34,7 @@ class Navigation {
 			this.toc = this.load(xml);
 		} else if(html) {
 			this.toc = this.parseNav(xml);
+			this.landmarks = this.parseLandmarks(xml);
 		} else if(ncx){
 			this.toc = this.parseNcx(xml);
 		}
@@ -92,7 +94,7 @@ class Navigation {
 	}
 
 	/**
-	 * Parse from a Epub > 3.0 Nav
+	 * Parse toc from a Epub > 3.0 Nav
 	 * @private
 	 * @param  {document} navHtml
 	 * @return {array} navigation list
@@ -164,6 +166,56 @@ class Navigation {
 		};
 	}
 
+	/**
+	 * Parse landmarks from a Epub > 3.0 Nav
+	 * @private
+	 * @param  {document} navHtml
+	 * @return {array} landmarks list
+	 */
+	parseLandmarks(navHtml){
+		var navElement = querySelectorByType(navHtml, "nav", "landmarks");
+		var navItems = navElement ? qsa(navElement, "li") : [];
+		var length = navItems.length;
+		var i;
+		var list = [];
+		var item;
+
+		if(!navItems || length === 0) return list;
+
+		for (i = 0; i < length; ++i) {
+			item = this.landmarkItem(navItems[i]);
+			if (item) {
+				list.push(item);
+			}
+		}
+
+		return list;
+	}
+
+	/**
+	 * Create a landmarkItem
+	 * @private
+	 * @param  {element} item
+	 * @return {object} landmarkItem
+	 */
+	landmarkItem(item){
+		let content = filterChildren(item, "a", true);
+
+		if (!content) {
+			return;
+		}
+
+		let type = content.getAttributeNS("http://www.idpf.org/2007/ops", "type") || undefined;
+		let href = content.getAttribute("href") || "";
+		let text = content.textContent || "";
+
+		return {
+			"href": href,
+			"label": text,
+			"type" : type
+		};
+	}
+
 	/**
 	 * Parse from a Epub > 3.0 NC
 	 * @private