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/**
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* This file is part of Haketilo.
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*
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* Function: Storage manager, lighter than the previous one.
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*
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* Copyright (C) 2021 Wojtek Kosior
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* Redistribution terms are gathered in the `copyright' file.
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*/
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/*
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* IMPORTS_START
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* IMPORT TYPE_PREFIX
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* IMPORT raw_storage
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* IMPORT is_mozilla
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* IMPORT observables
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*/
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const reg_spec = new Set(["\\", "[", "]", "(", ")", "{", "}", ".", "*", "+"]);
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const escape_reg_special = c => reg_spec.has(c) ? "\\" + c : c;
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function make_regex(name)
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{
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return new RegExp(`^${name.split("").map(escape_reg_special).join("")}\$`);
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}
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const listeners_by_callback = new Map();
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function listen(callback, prefix, name)
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{
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let by_prefix = listeners_by_callback.get(callback);
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if (!by_prefix) {
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by_prefix = new Map();
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listeners_by_callback.set(callback, by_prefix);
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}
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let by_name = by_prefix.get(prefix);
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if (!by_name) {
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by_name = new Map();
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by_prefix.set(prefix, by_name);
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}
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let name_reg = by_name.get(name);
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if (!name_reg) {
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name_reg = name.test ? name : make_regex(name);
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by_name.set(name, name_reg);
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}
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}
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function no_listen(callback, prefix, name)
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{
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const by_prefix = listeners_by_callback.get(callback);
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if (!by_prefix)
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return;
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const by_name = by_prefix.get(prefix);
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if (!by_name)
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return;
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const name_reg = by_name.get(name);
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if (!name_reg)
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return;
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by_name.delete(name);
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if (by_name.size === 0)
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by_prefix.delete(prefix);
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if (by_prefix.size === 0)
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listeners_by_callback.delete(callback);
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}
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function storage_change_callback(changes, area)
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{
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if (is_mozilla && area !== "local")
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{console.log("area", area);return;}
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for (const item of Object.keys(changes)) {
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for (const [callback, by_prefix] of listeners_by_callback.entries()) {
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const by_name = by_prefix.get(item[0]);
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if (!by_name)
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continue;
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for (const reg of by_name.values()) {
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if (!reg.test(item.substring(1)))
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continue;
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try {
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callback(item, changes[item]);
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} catch(e) {
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console.error(e);
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}
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}
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}
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}
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}
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raw_storage.listen(storage_change_callback);
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const created_observables = new Map();
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async function observe(prefix, name)
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{
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const observable = observables.make();
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const callback = (it, ch) => observables.set(observable, ch.newValue);
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listen(callback, prefix, name);
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created_observables.set(observable, [callback, prefix, name]);
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observables.silent_set(observable, await raw_storage.get(prefix + name));
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return observable;
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}
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const observe_var = name => observe(TYPE_PREFIX.VAR, name);
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function no_observe(observable)
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{
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no_listen(...created_observables.get(observable) || []);
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created_observables.delete(observable);
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}
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const light_storage = {};
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Object.assign(light_storage, raw_storage);
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Object.assign(light_storage,
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{listen, no_listen, observe, observe_var, no_observe});
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/*
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* EXPORTS_START
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* EXPORT light_storage
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* EXPORTS_END
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*/
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