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DataCache - Simple storage wrapper

Allows JSON data to be persisted easily by user scripts

Ce script ne devrait pas être installé directement. C'est une librairie créée pour d'autres scripts. Elle doit être inclus avec la commande // @require https://updategreasyfork.deno.dev/scripts/10443/56962/DataCache%20-%20Simple%20storage%20wrapper.js 

function DataCache(key) {
  this._key = key;
  this._data = {};
  this.load();
}
 
DataCache.prototype = {
  getValue: function(k) {
    return this._data[k];
  },
  setValue: function(k, v) {
    this._data[k] = v;
    this.save();
  },
  deleteValue: function(k) {
    if (k in this._data) {
      delete this._data[k];
      this.save();
    }
  },
  hasValue: function(k) {
    return k in this._data;
  },
  listValues: function() {
    return Object.keys(this._data).sort();
  },
  clear: function() {
    this._data = {};
    this.save();
  },
  save: function() {
    var s = JSON.stringify(this._data);
    GM_setValue(this._key, s);
    console.info('Cache(' + this._key + ') saved: ' + s);
  },
  load: function(s) {
    try {
      this._data = JSON.parse(s || GM_getValue(this._key));
    }
    catch (ex) {
      this.clear();
    }
  },
  edit: function() {
    var res = window.prompt('Edit cached package URLs', JSON.stringify(this._data, null, 2));
    if (res !== null) {
      try {
        this._data = res ? JSON.parse(res) : {};
        this.save();
      }
      catch (ex) {
        console.warn('Failed to update cache data: %s %o', ex.toString(), ex);
      }
    }
  },
  toString: function() {
    return 'Cache(' + this._key + '): [' + this.listValues.join('\n') + ']';
  },
  dump: function() {
    console.log('Cache(' + this._key + '):\n' + JSON.stringify(this._data, null, 2));
  }
};