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/**
* This file is part of Haketilo.
*
* Function: Storage manager, lighter than the previous one.
*
* Copyright (C) 2021 Wojtek Kosior
*
* 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 of this code in a
* proprietary program, I am not going to enforce this in court.
*/
#IMPORT common/storage_raw.js AS raw_storage
#IMPORT common/observables.js
#FROM common/stored_types.js IMPORT TYPE_PREFIX
const reg_spec = new Set(["\\", "[", "]", "(", ")", "{", "}", ".", "*", "+"]);
const escape_reg_special = c => reg_spec.has(c) ? "\\" + c : c;
function make_regex(name)
{
return new RegExp(`^${name.split("").map(escape_reg_special).join("")}\$`);
}
const listeners_by_callback = new Map();
function listen(callback, prefix, name)
{
let by_prefix = listeners_by_callback.get(callback);
if (!by_prefix) {
by_prefix = new Map();
listeners_by_callback.set(callback, by_prefix);
}
let by_name = by_prefix.get(prefix);
if (!by_name) {
by_name = new Map();
by_prefix.set(prefix, by_name);
}
let name_reg = by_name.get(name);
if (!name_reg) {
name_reg = name.test ? name : make_regex(name);
by_name.set(name, name_reg);
}
}
#EXPORT listen
function no_listen(callback, prefix, name)
{
const by_prefix = listeners_by_callback.get(callback);
if (!by_prefix)
return;
const by_name = by_prefix.get(prefix);
if (!by_name)
return;
const name_reg = by_name.get(name);
if (!name_reg)
return;
by_name.delete(name);
if (by_name.size === 0)
by_prefix.delete(prefix);
if (by_prefix.size === 0)
listeners_by_callback.delete(callback);
}
#EXPORT no_listen
function storage_change_callback(changes, area)
{
#IF MOZILLA
if (area !== "local") {
console.warn("change in storage area", area);
return;
}
#ENDIF
for (const item of Object.keys(changes)) {
for (const [callback, by_prefix] of listeners_by_callback.entries()) {
const by_name = by_prefix.get(item[0]);
if (!by_name)
continue;
for (const reg of by_name.values()) {
if (!reg.test(item.substring(1)))
continue;
try {
callback(item, changes[item]);
} catch(e) {
console.error(e);
}
}
}
}
}
raw_storage.listen(storage_change_callback);
const created_observables = new Map();
async function observe(prefix, name)
{
const observable = observables.make();
const callback = (it, ch) => observables.set(observable, ch.newValue);
listen(callback, prefix, name);
created_observables.set(observable, [callback, prefix, name]);
observables.silent_set(observable, await raw_storage.get(prefix + name));
return observable;
}
#EXPORT observe
#EXPORT name => observe(TYPE_PREFIX.VAR, name) AS observe_var
function no_observe(observable)
{
no_listen(...created_observables.get(observable) || []);
created_observables.delete(observable);
}
#EXPORT no_observe
#EXPORT raw_storage.set AS set
#EXPORT raw_storage.set_var AS set_var
#EXPORT raw_storage.get_var AS get_var
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