add in master snapshot of epubjs

1 files changed, 70 insertions, 0 deletions

diff --git a/lib/epub.js/src/displayoptions.js b/lib/epub.js/src/displayoptions.js
new file mode 100644
index 0000000..a2793e2
--- /dev/null
+++ b/lib/epub.js/src/displayoptions.js
@@ -0,0 +1,70 @@
+import {qs, qsa } from "./utils/core";
+
+/**
+ * Open DisplayOptions Format Parser
+ * @class
+ * @param {document} displayOptionsDocument XML
+ */
+class DisplayOptions {
+	constructor(displayOptionsDocument) {
+		this.interactive = "";
+		this.fixedLayout = "";
+		this.openToSpread = "";
+		this.orientationLock = "";
+
+		if (displayOptionsDocument) {
+			this.parse(displayOptionsDocument);
+		}
+	}
+
+	/**
+	 * Parse XML
+	 * @param  {document} displayOptionsDocument XML
+	 * @return {DisplayOptions} self
+	 */
+	parse(displayOptionsDocument) {
+		if(!displayOptionsDocument) {
+			return this;
+		}
+
+		const displayOptionsNode = qs(displayOptionsDocument, "display_options");
+		if(!displayOptionsNode) {
+			return this;
+		} 
+
+		const options = qsa(displayOptionsNode, "option");
+		options.forEach((el) => {
+			let value = "";
+
+			if (el.childNodes.length) {
+				value = el.childNodes[0].nodeValue;
+			}
+
+			switch (el.attributes.name.value) {
+			    case "interactive":
+			        this.interactive = value;
+			        break;
+			    case "fixed-layout":
+			        this.fixedLayout = value;
+			        break;
+			    case "open-to-spread":
+			        this.openToSpread = value;
+			        break;
+			    case "orientation-lock":
+			        this.orientationLock = value;
+			        break;
+			}
+		});
+
+		return this;
+	}
+
+	destroy() {
+		this.interactive = undefined;
+		this.fixedLayout = undefined;
+		this.openToSpread = undefined;
+		this.orientationLock = undefined;
+	}
+}
+
+export default DisplayOptions;