Haketilo

/**

 * This file is part of Haketilo.

 *

 * Function: Operations on resources and mappings.

 *

 * Copyright (C) 2021 Wojtek Kosior <koszko@koszko.org>

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * As additional permission under GNU GPL version 3 section 7, you

 * may distribute forms of that code without the copy of the GNU

 * GPL normally required by section 4, provided you include this

 * license notice and, in case of non-source distribution, a URL

 * through which recipients can access the Corresponding Source.

 * If you modify file(s) with this exception, you may extend this

 * exception to your version of the file(s), but you are not

 * obligated to do so. If you do not wish to do so, delete this

 * exception statement from your version.

 *

 * As a special exception to the GPL, any HTML file which merely

 * makes function calls to this code, and for that purpose

 * includes it by reference shall be deemed a separate work for

 * copyright law purposes. If you modify this code, you may extend

 * this exception to your version of the code, but you are not

 * obligated to do so. If you do not wish to do so, delete this

 * exception statement from your version.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <https://www.gnu.org/licenses/>.

 *

 * I, Wojtek Kosior, thereby promise not to sue for violation of this file's

 * license. Although I request that you do not make use this code in a

 * proprietary program, I am not going to enforce this in court.

 */

/*

 * Convert ver_str into an array representation, e.g. for ver_str="4.6.13.0"

 * return [4, 6, 13, 0].

 */

const parse_version = ver_str => ver_str.split(".").map(parseInt);

/*

 * ver is an array of integers. rev is an optional integer. Produce string

 * representation of version (optionally with revision number), like:

 *     1.2.3-5

 * No version normalization is performed.

 */

const version_string = (ver, rev=0) => ver.join(".") + (rev ? `-${rev}` : "");

/* vers should be an array of comparable values. Return the greatest one. */

const max = vals => Array.reduce(vals, (v1, v2) => v1 > v2 ? v1 : v2);

/*

 * versioned_item should be a dict with keys being version strings and values

 * being definitions of the respective versions of a single resource/mapping.

 * Example:

 *     {

 *         "1": {

 *             version: [1]//,

 *             // more stuff

 *         },

 *         "1.1": {

 *             version: [1, 1]//,

 *             // more stuff

 *         }

 *      }

 *

 * Returns the definition with the highest version.

 */

function get_newest_version(versioned_item)

{

    const best_ver = max(Object.keys(versioned_item).map(parse_version));

    return versioned_item[version_string(best_ver)];

}

/*

 * item is a definition of a resource or mapping. Yield all file references

 * (objects with `file` and `sha256` properties) this definition has.

 */

function* get_used_files(item)

{

    for (const file of item.source_copyright)

	yield file;

    if (item.type === "resource") {

	for (const file of item.scripts || [])

	    yield file;

    }

}

const entities = {

    get_newest: get_newest_version,

    get_files:  get_used_files

};

/*

 * EXPORTS_START

 * EXPORT entities

 * EXPORTS_END

 */

/*

 * Note: the functions below were overeagerly written and are not used now but

 * might prove useful to once we add more functionalities and are hence kept...

 */

/*

 * Clone recursively all objects. Leave other items (arrays, strings) untouched.

 */

function deep_object_copy(object)

{

    const orig = {object};

    const result = {};

    const to_copy = [[orig, {}]];

    while (to_copy.length > 0) {

	const [object, copy] = to_copy.pop();

	for (const [key, value] of Object.entries(object)) {

	    copy[key] = value;

	    if (typeof value === "object" && !Array.isArray(value)) {

		const value_copy = {};

		to_copy.push([value, value_copy]);

		copy[key] = value_copy;

	    }

	}

    }

    return result.orig;

}

/* helper function for normalize_version() */

const version_reductor = (acc, n) => [...(n || acc.length ? [n] : []), ...acc];

/*

 * ver is an array of integers. Strip right-most zeroes from ver.

 *

 * Returns a *new* array. Doesn't modify its argument.

 */

const normalize_version = ver => Array.reduceRight(ver, version_reductor, []);