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* Constants
*/
const DEFAULT_SETTINGS = Symbol('DefaultSettings');
const RUNTIME_SETTINGS = Symbol('RuntimeSettings');
const OBJECT_SETTINGS_MAP = Symbol('ObjectSettingsMap');
const DICTIONARY = Symbol('Dictionary');
/**
* Settings
*/
export default class Settings {
constructor(base?: Settings) {
const dictionary = Object.create(
(base instanceof Settings && DICTIONARY in base
? base[DICTIONARY]
: null) as object
);
Object.seal(
Object.defineProperty(this, DICTIONARY, {
value: dictionary,
})
);
}
set(key: string, value: unknown): boolean {
return set(this[DICTIONARY], key, value, null);
}
get(key: string): unknown {
return get(this[DICTIONARY], key);
}
/**
* Unset a specific key or a set of keys within a namespace when the key ends with a dot (ASCII #46).
* If the key is ".", all keys will be removed and this command works as a reset.
* @param key - name The key to be unset or a namespace.
* @returns boolean
*/
unset(key: string): boolean {
return unset(this[DICTIONARY], key + '');
}
forEach(callback: (key: string, value: unknown) => void): void {
iterate(this[DICTIONARY], callback);
}
extend(): Settings {
return new Settings(this);
}
/**
* Recursively import all properties from the given plain JavaScript object.
* This method has the opposite effect of the `dump` method.
* @param root - The root object whose properties will
* be imported.
*/
import(root: Record<string, unknown>): void {
Eif (isPlainObject(root)) {
Object.keys(root).forEach((key) => {
set(this[DICTIONARY], key, root[key], null);
});
}
}
/**
* Build a JSON representation of the current internal state of this settings
* object. The returned object can be safely passed to `JSON.stringify`
* function.
* @returns The JSON representation of the current
* state of this settings instance
*/
dump(): Record<string, unknown> {
const context = {};
iterate(this[DICTIONARY], (key, value) => {
Eif (typeof value !== 'undefined') {
deepSet(context, key, value);
}
});
return context;
}
static assert(subject: Settings): Settings {
return subject instanceof Settings
? subject
: Settings.getRuntimeSettings();
}
static getDefaultSettings(subfield = null): Settings | any {
let defaultSettings = Settings[DEFAULT_SETTINGS];
if (!(defaultSettings instanceof Settings)) {
defaultSettings = new Settings();
Settings[DEFAULT_SETTINGS] = defaultSettings;
}
// Given subfield of 'segmentation' it will return all settings
// that starts with segmentation.*
Iif (subfield) {
const settingObj = {};
defaultSettings.forEach((name: string) => {
if (name.startsWith(subfield)) {
const setting = name.split(`${subfield}.`)[1];
settingObj[setting] = defaultSettings.get(name);
}
});
return settingObj;
}
return defaultSettings;
}
static getRuntimeSettings(): Settings {
let runtimeSettings = Settings[RUNTIME_SETTINGS];
if (!(runtimeSettings instanceof Settings)) {
runtimeSettings = new Settings(Settings.getDefaultSettings());
Settings[RUNTIME_SETTINGS] = runtimeSettings;
}
return runtimeSettings;
}
static getObjectSettings(subject: unknown, from?: unknown): Settings {
let settings = null;
if (subject instanceof Settings) {
settings = subject;
} else if (typeof subject === 'object' && subject !== null) {
let objectSettingsMap = Settings[OBJECT_SETTINGS_MAP];
if (!(objectSettingsMap instanceof WeakMap)) {
objectSettingsMap = new WeakMap();
Settings[OBJECT_SETTINGS_MAP] = objectSettingsMap;
}
settings = objectSettingsMap.get(subject);
if (!(settings instanceof Settings)) {
settings = new Settings(
Settings.assert(Settings.getObjectSettings(from))
);
objectSettingsMap.set(subject, settings);
}
}
return settings;
}
static extendRuntimeSettings(): Settings {
return Settings.getRuntimeSettings().extend();
}
}
/*
* Local Helpers
*/
function unset(dictionary: Record<string, unknown>, name: string): boolean {
Eif (name.endsWith('.')) {
let deleteCount = 0;
const namespace = name;
const base = namespace.slice(0, -1);
const deleteAll = base.length === 0;
for (const key in dictionary) {
if (
Object.prototype.hasOwnProperty.call(dictionary, key) &&
(deleteAll || key.startsWith(namespace) || key === base)
) {
delete dictionary[key];
++deleteCount;
}
}
return deleteCount > 0;
}
return delete dictionary[name];
}
function iterate(
dictionary: Record<string, unknown>,
callback: (key: string, value: unknown) => void
): void {
for (const key in dictionary) {
callback(key, dictionary[key]);
}
}
function setAll(
dictionary: Record<string, unknown>,
prefix: string,
record: Record<string, unknown>,
references: WeakSet<Record<string, unknown>>
): boolean {
let failCount: number;
if (references.has(record)) {
return set(dictionary, prefix, null, references);
}
references.add(record);
failCount = 0;
for (const field in record) {
Eif (Object.prototype.hasOwnProperty.call(record, field)) {
const key = field.length === 0 ? prefix : `${prefix}.${field}`;
Iif (!set(dictionary, key, record[field], references)) {
++failCount;
}
}
}
references.delete(record);
return failCount === 0;
}
/**
* Set the key-value pair on a given dictionary. If the given value is a
* plain javascript object, every property of that object will also be set.
* @param dictionary {Record<string, unknown>} The target dictionary
* @param key {string} The given key
* @param value {unknown} The given value
* @param references {WeakSet<Record<string, unknown>>} references is a WeakSet
* instance used to keep track of which objects have already been iterated
* through preventing thus possible stack overflows caused by cyclic references
* @returns {boolean} Returns true if every given key-value pair has been
* successfully set
*/
function set(
dictionary: Record<string, unknown>,
key: string,
value: unknown,
references: WeakSet<Record<string, unknown>>
): boolean {
if (isValidKey(key)) {
if (isPlainObject(value)) {
return setAll(
dictionary,
key,
value as Record<string, unknown>,
references instanceof WeakSet ? references : new WeakSet()
);
}
dictionary[key] = value;
return true;
}
return false;
}
function get(dictionary: Record<string, unknown>, key: string): unknown {
return dictionary[key];
}
/**
* Make sure the -provided key correctly formatted.
* e.g.:
* "my.cool.property" (valid)
* "my.cool.property." (invalid)
* ".my.cool.property" (invalid)
* "my.cool..property" (invalid)
* @param key {string} The property name to be used as key within the internal
* dictionary
* @returns {boolean} True on success, false otherwise
*/
function isValidKey(key: string): boolean {
let last: number, current: number, previous: number;
Iif (typeof key !== 'string' || (last = key.length - 1) < 0) {
return false;
}
previous = -1;
while ((current = key.indexOf('.', previous + 1)) >= 0) {
if (current - previous < 2 || current === last) {
return false;
}
previous = current;
}
return true;
}
function isPlainObject(subject: unknown) {
if (typeof subject === 'object' && subject !== null) {
const prototype = Object.getPrototypeOf(subject);
Eif (prototype === Object.prototype || prototype === null) {
return true;
}
}
return false;
}
function deepSet(context, key, value) {
const separator = key.indexOf('.');
if (separator >= 0) {
const subKey = key.slice(0, separator);
let subContext = context[subKey];
if (typeof subContext !== 'object' || subContext === null) {
const subContextValue = subContext;
subContext = {};
if (typeof subContextValue !== 'undefined') {
subContext[''] = subContextValue;
}
context[subKey] = subContext;
}
deepSet(subContext, key.slice(separator + 1, key.length), value);
} else {
context[key] = value;
}
}
/**
* Initial Settings for the repository
*/
Settings.getDefaultSettings().set('useCursors', true);
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