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/**
* Myext scripts and bags usage index
*
* Copyright (C) 2021 Wojtek Kosior
*
* Dual-licensed under:
* - 0BSD license
* - GPLv3 or (at your option) any later version
*/
"use strict";
/*
* We want to count referenes to scripts and bags in order to know,
* for example, whether one can be safely deleted.
*/
(() => {
const TYPE_PREFIX = window.TYPE_PREFIX;
const get_storage = window.get_storage;
const make_once = window.make_once;
var component_uses = new Map();
var storage;
function add_use_info_by_item(prefix, item, components)
{
for (let component of components) {
component = component.join("");
let used_by_info = component_uses.get(component);
if (used_by_info === undefined) {
used_by_info = {};
component_uses.set(component, used_by_info);
}
if (used_by_info[prefix] === undefined)
used_by_info[prefix] = new Set();
used_by_info[prefix].add(item);
}
}
function remove_use_info_by_item(prefix, item, components)
{
for (let component of components) {
used_by_info = component_uses.get(component.join(""));
if (used_by_info === undefined ||
used_by_info[prefix] === undefined)
return;
used_by_info[prefix].delete(item);
}
}
function build_reverse_uses_info(entries_it, type_prefix)
{
for (let [item, components] of storage.get_all_it(type_prefix))
add_use_info_by_item(type_prefix, item, components);
}
function handle_change(change)
{
if (change.old_val !== undefined)
remove_use_info_by_item(change.prefix, change.item, change.old_val);
if (change.new_val !== undefined)
add_use_info_by_item(change.prefix, change.item, change.new_val);
}
function get_uses(arg1, arg2=undefined)
{
let [prefix, item] = [arg1, arg2];
if (arg2 === undefined)
[prefix, item] = arg1;
return component_uses.get(prefix + item);
}
async function init()
{
storage = await get_storage();
prefixes = [TYPE_PREFIX.PAGE, TYPE_PREFIX.BAG];
for (let prefix of prefixes)
build_reverse_uses_info(prefix);
storage.add_change_listener(handle_change, prefixes);
return get_uses;
}
window.get_reverse_use_info = make_once(init);
})();
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