How can I tell the version using the publicationParser (e.g. EPUB 2 vs. EPUB 3)?

[jdempcy]

I see that you can get the version from the OPF, but that requires passing in a zip. We are currently using r2-shared-js and already have the publicationParser working (it works great! So thanks for that!). But we would like to be able to tell if it's an EPUB 2 or EPUB 3 or higher, just from the publicationParser.

Here is an excerpt of what we are doing:

        const pub = await publicationParser.PublicationParsePromise(path);

        if (typeof pub.Metadata.Title === "string") {
            bookTitle = pub.Metadata.Title;
            coverUrl = pub.GetCover()?.Href || '';
            manifest = serializable.TaJsonSerialize(pub);

            const zipInternal = pub.findFromInternal("zip");
            if (!zipInternal) {
                throw new Error("There is no publication zip!");
            }

It would be nice if we could check, for instance. pub.Version and be able to tell the EPUB version. Is there another way to do this?

Thanks!
Jonah

[danielweck]

Hi Jonah, this might be useful to you, but the information would need to be hoisted up into the publication object:

r2-shared-js/src/parser/epub-daisy-common.ts

Lines 68 to 83 in 8a61896

	const getEpubVersion = (rootfile: Rootfile, opf: OPF): string | undefined => {
	if (rootfile.Version) {
	return rootfile.Version;
	} else if (opf.Version) {
	return opf.Version;
	}
	return undefined;
	};
	export const isEpub3OrMore = (rootfile: Rootfile, opf: OPF): boolean => {
	const version = getEpubVersion(rootfile, opf);
	return (version === epub3 || version === epub301 || version === epub31);
	};