@ribajs/core
Version:
Core module of Riba.js
194 lines • 15.5 kB
JavaScript
import { isObject } from "@ribajs/utils/src/type.js";
export class Observer {
static adapters;
static interfaces = [];
static rootInterface;
static updateOptions(options) {
if (!options.adapters) {
throw new Error("adapters are required!");
}
if (options.adapters) {
Observer.adapters = { ...Observer.adapters, ...options.adapters };
Observer.interfaces = Object.keys(Observer.adapters);
}
Observer.rootInterface = options.rootInterface || Observer.interfaces[0];
if (!Observer.rootInterface) {
throw new Error("rootInterface is required!");
}
}
static tokenize(keypath, root) {
const tokens = [];
let current = { i: root, path: "" };
let index;
let chr;
for (index = 0; index < keypath.length; index++) {
chr = keypath.charAt(index);
if (~Observer.interfaces.indexOf(chr)) {
tokens.push(current);
current = { i: chr, path: "" };
}
else {
current.path += chr;
}
}
tokens.push(current);
return tokens;
}
static get(key, obj) {
return Observer.adapters[key.i].get(obj, key.path);
}
static set(active, key, obj, callback) {
if (active) {
Observer.adapters[key.i].observe(obj, key.path, callback);
}
else {
Observer.adapters[key.i].unobserve(obj, key.path, callback);
}
}
keypath;
callback;
objectPath;
obj;
target;
key;
tokens;
constructor(model, keypath, callback) {
this.keypath = keypath;
this.callback = callback;
this.objectPath = [];
const parseResult = this.parse();
this.key = parseResult.key;
this.tokens = parseResult.tokens;
this.obj = this.getRootObject(model);
this.target = this.realize();
if (isObject(this.target)) {
Observer.set(true, this.key, this.target, this.callback);
}
}
parse() {
let path;
let root;
if (!Observer.interfaces || !Observer.interfaces.length) {
throw new Error(`[Observer] Must define at least one adapter interface. interfaces: "${JSON.stringify(Observer.interfaces)}" adapters: "${JSON.stringify(Observer.adapters)}"`);
}
if (~Observer.interfaces.indexOf(this.keypath[0])) {
root = this.keypath[0];
path = this.keypath.substr(1);
}
else {
root = Observer.rootInterface;
path = this.keypath;
}
this.tokens = Observer.tokenize(path, root);
if (!this.tokens.length) {
throw new Error("[Observer] No tokens");
}
this.key = this.tokens.pop();
return {
key: this.key,
tokens: this.tokens,
};
}
realize() {
let current = this.obj;
let unreached = -1;
let prev;
let token;
for (let index = 0; index < this.tokens.length; index++) {
token = this.tokens[index];
if (isObject(current)) {
if (typeof this.objectPath[index] !== "undefined") {
prev = this.objectPath[index];
if (current !== prev) {
Observer.set(false, token, prev, this);
Observer.set(true, token, current, this);
this.objectPath[index] = current;
}
}
else {
Observer.set(true, token, current, this);
this.objectPath[index] = current;
}
current = Observer.get(token, current);
}
else {
if (unreached === -1) {
unreached = index;
}
prev = this.objectPath[index];
if (prev) {
Observer.set(false, token, prev, this);
}
}
}
if (unreached !== -1) {
this.objectPath.splice(unreached);
}
return current;
}
sync() {
let oldValue;
let newValue;
const next = this.realize();
if (next !== this.target) {
if (isObject(this.target)) {
Observer.set(false, this.key, this.target, this.callback);
}
if (isObject(next)) {
Observer.set(true, this.key, next, this.callback);
}
oldValue = this.value();
this.target = next;
newValue = this.value();
if (newValue !== oldValue || Array.isArray(newValue)) {
this.callback.sync();
}
}
else if (Array.isArray(next)) {
this.callback.sync();
}
}
value() {
if (isObject(this.target)) {
return Observer.get(this.key, this.target);
}
}
setValue(value) {
if (isObject(this.target)) {
Observer.adapters[this.key.i].set(this.target, this.key.path, value);
}
}
unobserve() {
let obj;
let token;
for (let index = 0; index < this.tokens.length; index++) {
token = this.tokens[index];
obj = this.objectPath[index];
if (obj) {
Observer.set(false, token, obj, this);
}
}
if (isObject(this.target)) {
Observer.set(false, this.key, this.target, this.callback);
}
}
getRootObject(obj) {
let rootProp;
let current;
if (!obj.$parent) {
return obj;
}
if (this.tokens.length) {
rootProp = this.tokens[0].path;
}
else {
rootProp = this.key.path;
}
current = obj;
while (current.$parent && current[rootProp] === undefined) {
current = current.$parent;
}
return current;
}
}
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