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index.js
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/** Copyright (c) 2024, Manuel Lõhmus (MIT License). */
"use strict";
(function () {
exportModule("data-context", function factory() {
/**
* Create a new proxy object with the same structure as the original object.
* With the ability to listen to changes in the object
* and the ability to restore the original object.
* @param {any} value Value.
* @param {string} propertyName Property name. Default is null.
* @param {any} parent Parent. Default is null.
* @returns {Proxy} Returns a proxy object.
*/
function createDataContext(value, propertyName = null, parent = null) {
if (createDataContext === this?.constructor) { throw new Error('This function must be used without the `new` keyword.'); }
var type = _typeof(value);
if (value?._isDataContext || type !== "object" && type !== "array") { return value; }
var proxy = null;
Object.defineProperties(value, {
_isDataContext: { value: true, writable: false, configurable: false, enumerable: false },
_isModified: { value: false, writable: true, configurable: false, enumerable: false },
_modified: { value: [], writable: false, configurable: false, enumerable: false },
_propertyName: {
configurable: false, enumerable: false,
get: function () { return propertyName; },
set: function (v) { propertyName = v; }
},
_parent: {
configurable: false, enumerable: false,
get: function () {
if (parent === null) { return null; }
if (_isMyParent()) { return parent; }
return null;
},
set: function (v) { parent = v; }
},
toString: {
writable: true, configurable: false, enumerable: false,
value: function toString() {
if (type === "object") { return "{" + Object.keys(this).map(function (k) { return _string(k) + ":" + _string(value[k]); }).join(",") + "}"; }
if (type === "array") { return "[" + this.map(function (v) { return _string(v); }).join(",") + "]"; }
return "undefined";
function _string(val) {
if (val?._isDataContext) { return val.toString(); }
var t = typeof val;
if (t === "string") { return '"' + val + '"'; }
if (t === "boolean") { return Boolean.prototype.toString.call(val); }
if (t === "number") { return Number.prototype.toString.call(val); }
if (val === null) { return "null"; }
if (Array.isArray(val)) { return "[" + val.map(function (v) { return _string(v); }).join(",") + "]"; }
if (t === "object") { return "{" + Object.keys(val).map(function (k) { return _string(k) + ":" + _string(val[k]); }).join(",") + "}"; }
return "undefined";
}
}
},
overwritingData: {
writable: true, configurable: false, enumerable: false,
value: function _overwritingData(text, reviver) { parse.call(this, text, reviver); }
},
stringifyChanges: {
writable: true, configurable: false, enumerable: false,
value: function _stringifyChanges(replacer, space, modifiedData = true, setUnmodified = true) {
return stringify(this, replacer, space, { modifiedData, setUnmodified });
}
},
// EventEmitter
_events: { value: {}, writable: true, configurable: false, enumerable: false },
once: {
writable: false, configurable: false, enumerable: false,
/**
* @param {string} eventName
* @param {(...params:any)=>void} listener
* @returns {DataContext}
*/
value: function once(eventName, listener) {
return this.on(eventName, listener, false);
}
},
on: {
writable: false, configurable: false, enumerable: false,
/**
* @param {string} eventName
* @param {(...params:any)=>void} listener
* @param {boolean|()=>boolean|Node} isActive if false then adds a one-time listener function for the event named eventName. The next time eventName is triggered, this listener is removed and then invoked.
* @returns {DataContext}
*/
value: function on(eventName, listener, isActive = true) {
if (!this._events[eventName]) { this._events[eventName] = []; }
this._events[eventName].push(listener);
isActive && (listener.isActive = isActive);
return this;
}
},
emitToParent: {
writable: false, configurable: false, enumerable: false,
/**
* @param {string} eventName
* @param {...any} params
* @returns {boolean} Returns true if the event had listeners, false otherwise.
*/
value: function emit(eventName, ...params) {
var ret = this.emit(eventName, ...params);
if (parent && typeof parent.emitToParent === "function") {
//_modified
if (params[0] && params[0].propertyPath) {
params[0].propertyPath.unshift(propertyName);
}
ret = parent.emitToParent(eventName, ...params) || ret;
}
return ret;
}
},
emit: {
writable: false, configurable: false, enumerable: false,
value: function emit(eventName, ...params) {
var ret = false;
var arr = this._events[eventName] || [];
var index = 0;
while (index < arr.length) {
var listener = arr[index];
if (arr[index] === listener &&
(typeof listener.isActive === "function" && !listener.isActive()
|| listener.isActive?.isConnected === false
|| listener.isActive === undefined
|| !listener.isActive === true)) {
arr.splice(index, 1);
}
if (typeof listener.isActive === "function" && listener.isActive()
|| listener.isActive?.isConnected === true
|| listener.isActive === undefined
|| listener.isActive === true) {
ret = true;
if (!listener.call("undefined" != typeof window && listener.isActive instanceof window.Node && listener.isActive, ...params)) {
arr.splice(index, 1);
}
}
if (arr[index] === listener) { index++; }
}
if (this._events[eventName] && !this._events[eventName].length) {
delete this._events[eventName];
}
return ret;
}
}
});
proxy = new Proxy(value, handler);
Object.keys(value).forEach(function (key) {
if (value[key] && !value[key]._isDataContext) {
value[key] = createDataContext(value[key]);
}
if (value[key] && value[key]._isDataContext) {
value[key]._propertyName = key;
value[key]._parent = proxy;
}
});
return proxy;
function _isMyParent() { return !parent || parent && parent[propertyName] === proxy; }
}
/**
* Stringify type.
* @param {any} v Value.
* @returns {string} Returns the type of the value.
*/
function _typeof(v) { return v === null ? "null" : Array.isArray(v) ? "array" : typeof v; }
/**
* Is global object in the browser and Node.js.
* @param {any} g Check object.
* @returns {boolean} Returns true if the object is global.
*/
function isGlobal(g) { return g === (typeof globalThis !== 'undefined' ? globalThis : global || self); }
//#region *** Handler ***
var handler = { deleteProperty, set };
function deleteProperty(target, property) {
if (target.propertyIsEnumerable(property)) {
var oldValue = target[property],
newValue = undefined;
var ret = Reflect.deleteProperty(target, property);
if (oldValue === undefined) {
//console.log("? del: oldValue is undefined", property, { target, propertyPath: [property], oldValue, newValue });
target.emitToParent("-", { eventName: "delete", target, propertyPath: [property], oldValue, newValue });
target.emitToParent(property, { eventName: "delete", target, propertyPath: [property], oldValue, newValue });
}
//else if (oldValue._parent === null) {
// //console.log("'-delete' del: oldValue._parent is null", property, { target, propertyPath: [property], oldValue, newValue });
// target.emitToParent("-delete", { target, propertyPath: [property], oldValue, newValue });
// target.emitToParent(property, { eventName: "delete", target, propertyPath: [property], oldValue, newValue });
//}
else {
//console.log("'-delete' del: oldValue is ", property, event);
target.emitToParent("-", { eventName: "delete", target, propertyPath: [property], oldValue, newValue });
target.emitToParent(property, { eventName: "delete", target, propertyPath: [property], oldValue, newValue });
}
if (Array.isArray(target)) {
target._isModified = true;
}
else if (!target._modified.includes(property)) {
target._modified.push(property);
}
setModified(target._parent, target._propertyName);
if (Array.isArray(target)) {
var index = target._modified.indexOf(property);
if (index > -1) {
target._modified.splice(index, 1);
}
}
target.emitToParent(property, { eventName: "delete", target, propertyPath: [property], oldValue, newValue });
clearTimeout(target.emitToParent.timeout);
target.emitToParent.timeout = setTimeout(function () {
delete target.emitToParent.timeout;
target.emitToParent("-change", { eventName: "-change", target, propertyPath: [property], oldValue, newValue });
});
return ret;
}
return Reflect.deleteProperty(target, property);
}
function set(target, property, newValue, proxy) {
if (target.propertyIsEnumerable(property)
|| target[property] === undefined) {
var oldValue = target[property],
newValue = newValue && newValue._isDataContext ? newValue : createDataContext(newValue, property);
if (oldValue !== newValue) {
var eventName = "";
var _modifiedLength = target?._modified.length;
var ret = Reflect.set(target, property, newValue, proxy);
var isDC = newValue && newValue._isDataContext;
var isNew = isDC && newValue._parent !== proxy && oldValue === undefined;
isDC && (newValue._isModified = true);
isDC && (newValue._parent = proxy);
if (isDC && newValue._propertyName !== property) {
//console.log("'-reposition' set: newValue propertyName is change ", newValue + "", ">", property, event);
eventName = "reposition";
newValue._propertyName = property;
target.emitToParent("-", { eventName, target, propertyPath: [property], oldValue, newValue });
}
else if (isDC && isNew) {
//console.log("'-new' set: oldValue is undefined", property, event);
eventName = "new";
target.emitToParent("-", { eventName, target, propertyPath: [property], oldValue, newValue });
}
else {
//console.log("'-set' set: newValue parent is change", property, event);
eventName = "set";
target.emitToParent("-", { eventName, target, propertyPath: [property], oldValue, newValue });
}
setModified(target, property);
target.emitToParent(property, { eventName, target, propertyPath: [property], oldValue, newValue });
clearTimeout(target.emitToParent.timeout);
target.emitToParent.timeout = setTimeout(function () {
delete target.emitToParent.timeout;
if (target?._isModified || target?._modified.length !== _modifiedLength) {
target.emitToParent("-change", { eventName: "-change", target, propertyPath: [property], oldValue, newValue });
}
});
return ret;
}
}
return Reflect.set(target, property, newValue, proxy);
}
function setModified(target, property) {
if (target?._isDataContext) {
if (!target._modified.includes(property)) {
target._modified.push(property);
}
setModified(target._parent, target._propertyName);
}
}
//#endregion
//#region *** parse / stringify ***
/**
* Parse a string to an object.
* @param {string|number} text Input value.
* @param {any} reviver Reviver.
* @returns {any} Returns an object.
*/
function parse(text, reviver) {
if (text !== null
&& typeof text !== "string"
&& text && typeof text !== "number") {
return;
}
var it = new _it(text);
var _this = isGlobal(this) ? undefined : this;
var isOverwriting = Boolean(_this);
if (typeof reviver === "object") {
_this = reviver;
if (_this?._isDataContext) {
reviver = createDataContext;
}
}
if (reviver === createDataContext) {
reviver = function _set(k, v) {
if (v?._isDataContext) {
return v;
}
return createDataContext(v, k, this);
};
}
try {
var meta = _whitespace();
var value = _value(_this);
}
catch (e) {
throw "[ ERROR ] " + e
+ " In parsing position: " + it.position + " '" + it.current + "' => "
+ it.text.substring(it.position < 10 ? 0 : it.position - 10, it.position + 10)
.replace(/\r/g, "\\r")
.replace(/\n/g, "\\n");
}
_setMetadata(value, meta);
if (reviver && reviver.name === "_set") {
value = reviver.call(
undefined,
undefined,
value
);
return value;
}
if (reviver) {
value = reviver.call(
{ "": value },
"",
value
);
}
return value;
function _it(text) {
var currentPosition = 0;
this.text = text + '';
this.position = 1;
this.current = this.text.charAt(0);
this.following = this.text.charAt(1);
this.is = _is;
this.next = _next;
this.isInfiniteLoop = _isInfiniteLoop;
this.setPosition = _setPosition;
function _isInfiniteLoop() {
if (currentPosition !== this.position) {
currentPosition = this.position;
return false;
}
throw "Incorrect entry.";
}
function _next() {
this.position++;
this.current = this.following;
this.following = this.text.charAt(this.position);
}
function _is(str) {
if (this.text.substring(this.position - 1, this.position - 1 + str.length) === str) {
this.position = this.position + str.length;
this.current = this.text.charAt(this.position - 1);
this.following = this.text.charAt(this.position);
return true;
}
return false;
}
function _setPosition(pos) {
this.position = pos;
this.current = this.text.charAt(pos - 1);
this.following = this.text.charAt(pos);
}
}
function _get(val, def) {
if (it.current === '\r' && it.following === '\r'
|| _typeof(val) !== _typeof(def)) {
return def;
}
return val;
}
function _whitespace() {
var meta = [], metadata;
__whitespace();
while (metadata = _metadata()) {
if (metadata.trim()) { meta.push(metadata); }
__whitespace();
}
__whitespace();
return meta;
function __whitespace() {
while (it.current === '\n'
|| it.current === '\r'
|| it.current === '\t'
|| it.current === '\u0020') {
it.next();
}
}
}
function _metadata() {
if (it.current === '/' && (it.following === '*' || it.following === '/')) {
var metadata = '',
isMetadata = it.current === '/' && it.following === '*';
it.next();
it.next();
while (isMetadata && !(it.current === '*' && it.following === '/')
|| !isMetadata && !(it.current === '\r' || it.current === '\n')) {
metadata += it.current;
it.next();
}
if (it.current === '\r' || it.current === '\n') {
return ' ';
}
it.next();
it.next();
return metadata;
}
}
function _setMetadata(obj, metadata, key = '') {
if (createDataContext.IgnoreMetadata) { return; }
if (metadata && metadata.length && obj && typeof obj === 'object') {
key = key + "";
Object.defineProperty(
obj,
'-metadata' + (key ? '-' + key : ''),
{
value: metadata,
writable: true,
configurable: true,
enumerable: false
}
);
}
}
function _value(val) {
var _val = _object(val);
if (_val !== undefined) { return _val; }
_val = _array(val);
if (_val !== undefined) { return _val; }
_val = _string();
if (_val !== undefined) { return _val; }
_val = _true();
if (_val !== undefined) { return _val; }
_val = _false();
if (_val !== undefined) { return _val; }
_val = _null();
if (_val !== undefined) { return _val; }
_val = _number(val);
return _val;
}
function _string() {
_whitespace();
if (it.current === '"') {
var str = '';
it.next();
if (!it.current) { return; }
while (it.current && it.current !== '"') {
str += it.current;
it.next();
}
if (it.current === '"') {
it.next();
}
return str;
}
}
function _number() {
_whitespace();
var str = _negative();
if (it.current === "0") {
str += it.current;
it.next();
}
else {
str += _digit();
}
if (it.current === ".") {
str += it.current;
it.next();
str += _digit();
}
if (it.current && "eE".includes(it.current)) {
str += it.current;
it.next();
if (it.current && "-+".includes(it.current)) {
str += it.current;
it.next();
}
str += _digit();
}
if (!str) { return undefined; }
str = JSON.parse(str);
return str;
}
function _negative() {
if (it.current === '-') {
it.next();
return '-';
}
return '';
}
function _digit() {
var str = '';
while (it.current && "0123456789".includes(it.current)) {
str += it.current;
it.next();
}
return str;
}
function _object(val) {
var meta = _whitespace();
if (it.current === '{') {
it.next();
var obj = _get(val, {});
_setMetadata(obj, meta);
while (it.current !== '}' && !it.isInfiniteLoop()) {
meta = _whitespace();
var k = _key();
_whitespace();
var v = _value(obj[k]);
_whitespace();
if (it.current !== ',' && it.current !== '}') {
throw "Incorrect object separator.";
}
if (it.current === ',') {
it.next();
}
if (typeof k === 'string' && v !== undefined) {
if (reviver) {
Reflect.set(
obj,
k,
reviver.call(obj, k, v)
);
}
else {
obj[k] = v;
}
if (typeof obj[k] === 'object') {
_setMetadata(obj[k], meta);
}
else {
_setMetadata(obj, meta, k);
}
}
}
if (it.current === '}') {
it.next();
}
return obj;
}
}
function _key() {
_whitespace();
if (it.current === ":") {
throw "Invalid object key.";
}
var key = _string();
_whitespace();
if (typeof key !== "string" || it.current !== ":") {
throw "Invalid object key.";
}
else {
it.next();
}
return key;
}
function _array(val) {
var meta = _whitespace();
if (it.current === '[') {
it.next();
var arr = _get(val, []);
_setMetadata(arr, meta);
var i = 0;
while (it.current !== ']' && !it.isInfiniteLoop()) {
meta = _whitespace();
// for update
var index = _index();
if (isOverwriting && index === undefined) {
throw "Overwriting data -> index must be.";
}
_whitespace();
var v = _value(arr[typeof index === "number" && index || i]);
_whitespace();
if (it.current !== ',' && it.current !== ']') {
throw "Incorrect array separator.";
}
if (it.current === ',') {
it.next();
}
if (reviver) {
v = reviver.call(arr, String(typeof index === "number" && index || i), v);
}
if (v === undefined && typeof index === "number" && index > -1) {
arr.splice(index, 1);
}
else if (typeof index === "number" && arr[index] !== undefined) {
arr[index] = v;
}
else {
arr.push(v);
}
if (typeof arr[typeof index === "number" && index || i] === 'object') {
_setMetadata(arr[typeof index === "number" && index || i], meta);
}
else {
_setMetadata(arr, meta, typeof index === "number" && index || i);
}
i++;
}
if (it.current === ']') {
it.next();
}
return arr;
}
}
function _index() {
_whitespace();
if (it.current === ":") {
throw "Invalid array index.";
}
var pos = it.position;
var nr = _number();
_whitespace();
if (typeof nr !== "number" && it.current === ":") {
throw "Invalid array index.";
}
if (typeof nr === "number" && it.current === ":") {
it.next();
return nr;
}
it.setPosition(pos);
return;
}
function _true() {
_whitespace();
if (it.is('true')) {
return true;
}
}
function _false() {
_whitespace();
if (it.is('false')) {
return false;
}
}
function _null() {
_whitespace();
if (it.is('null')) {
return null;
}
}
}
/**
* Parse a string to an object, asynchronously.
* @param {any} textOrReadStream Input value.
* @param {any} reviver Reviver.
* @param {any} callback Callback. Optional.
* @returns {Promise} Returns a promise.
*/
function parsePromise(textOrReadStream, reviver, callback = null) {
if (textOrReadStream !== null
&& typeof textOrReadStream !== "string"
&& textOrReadStream && typeof textOrReadStream !== "number"
&& !_isStream(textOrReadStream)) {
return;
}
var it = new _it(textOrReadStream);
var _this = isGlobal(this) ? undefined : this;
var isOverwriting = Boolean(_this);
if (typeof reviver === "object") {
_this = reviver;
if (_this?._isDataContext) {
reviver = createDataContext;
}
}
if (reviver === createDataContext) {