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103 lines
2.6 KiB
JavaScript
103 lines
2.6 KiB
JavaScript
'use strict';
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const itype = require('itype/legacy');
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const Util = require('../common/util');
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const DOM = require('./dom');
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const jonny = require('jonny');
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const exec = require('execon');
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const Storage = Util.extendProto(StorageProto);
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const DOMProto = Object.getPrototypeOf(DOM);
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Util.extend(DOMProto, {
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Storage
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});
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function StorageProto() {
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/* приватный переключатель возможности работы с кэшем */
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var Allowed;
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/* функция проверяет возможно ли работать с кэшем каким-либо образом */
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this.isAllowed = () => {
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return Allowed && !!localStorage;
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};
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/**
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* allow Storage usage
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*/
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this.setAllowed = (isAllowed) => {
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Allowed = isAllowed;
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};
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/** remove element */
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this.remove = (item, callback) => {
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var ret = Allowed;
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if (ret)
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localStorage.removeItem(item);
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exec(callback, null, ret);
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return this;
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};
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this.removeMatch = (string, callback) => {
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var reg = RegExp('^' + string + '.*$');
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Object.keys(localStorage).forEach(function(name) {
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var is = reg.test(name);
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if (is)
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localStorage.removeItem(name);
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});
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exec(callback);
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return this;
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};
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/** если доступен localStorage и
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* в нём есть нужная нам директория -
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* записываем данные в него
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*/
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this.set = (name, data, callback) => {
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var str, error;
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if (itype.object(data))
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str = jonny.stringify(data);
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if (Allowed && name)
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error = exec.try(() => {
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localStorage.setItem(name, str || data);
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});
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exec(callback, error);
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return this;
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},
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/** Если доступен Storage принимаем из него данные*/
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this.get = function(name, callback) {
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var ret;
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if (Allowed)
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ret = localStorage.getItem(name);
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exec(callback, null, ret);
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return this;
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},
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/** функция чистит весь кэш для всех каталогов*/
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this.clear = function(callback) {
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var ret = Allowed;
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if (ret)
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localStorage.clear();
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exec(callback, null, ret);
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return this;
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};
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}
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