@fontoxml/fontoxml-development-tools/src/versionMapping.js

Development tools for Fonto.

import Version from './Version.js';

const PREVIOUS_MINOR_VERSIONS_BY_MAJOR = {
	8: ['7.17'],
	7: ['6.11', '6.12'],
};

/**
 * Returns the supported minor versions for upgrading to the specified version.
 *
 * NOTE: Even though full versions are returned, the main use is to use it for compatibility
 *       checking for upgrading; And thus the whole minor range is supported, not just that specific
 *       patch/full version.
 *
 * @param {Version} version
 *
 * @return {Version[] | null}
 */
export function getUpgradeSupportedVersions(version) {
	if (version.isUnversioned) {
		return null;
	}

	let minorVersions;
	if (version.minor === 0) {
		const previousMinorVersions =
			PREVIOUS_MINOR_VERSIONS_BY_MAJOR[version.major];
		if (!previousMinorVersions) {
			return null;
		}
		minorVersions = previousMinorVersions.slice();
	} else {
		const previousMinorVersion = new Version(version.format('core'));
		previousMinorVersion.minor -= 1;
		previousMinorVersion.patch = 0;
		minorVersions = [previousMinorVersion.format('minor')];
	}

	// Include the minor of the specified version.
	minorVersions.push(version.format('minor'));

	// Map to Version appending `.0` to the minor version.
	return minorVersions.map(
		(minorVersion) => new Version(`${minorVersion}.0`)
	);
}