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♻️ Remove signals from elements + better debbuging options

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This commit is contained in:
Jan Andrle
2023-10-19 13:51:25 +02:00
parent 702278c883
commit 46869736d5
3 changed files with 347 additions and 294 deletions
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57
src/signals-lib.js
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@ -6,7 +6,13 @@ export function isSignal(candidate){
}
/** @type {function[]} */
const stack_watch= [];
/** @type {WeakMap<function|ddeSignal<any, any>,Set<ddeSignal<any, any>>|function>} */
/**
* ### `WeakMap<function, Set<ddeSignal<any, any>>>`
* The `Set` is in the form of `[ source, ...depended signals (DSs) ]`. When the DS is cleaned it is removed from DSs, if remains only one (`source`) it is cleared too.
* ### `WeakMap<object, function>`
* This is used for revesed deps, the `function` is also key for `deps`.
* @type {WeakMap<function|object,Set<ddeSignal<any, any>>|function>}
* */
const deps= new WeakMap();
export function S(value, actions){
if(typeof value!=="function")
@ -15,12 +21,22 @@ export function S(value, actions){
const out= create();
const contextReWatch= function(){
const [ origin, ...deps_old ]= deps.get(contextReWatch);
deps.set(contextReWatch, new Set([ origin ]));
stack_watch.push(contextReWatch);
out(value());
stack_watch.pop();
if(!deps_old.length) return;
const deps_curr= deps.get(contextReWatch);
for (const dep_signal of deps_old){
if(deps_curr.has(dep_signal)) continue;
removeSignalListener(dep_signal, contextReWatch);
}
};
deps.set(contextReWatch, new Set([ out ]));
deps.set(out[mark], contextReWatch);
deps.set(contextReWatch, new Set([ out ]));
contextReWatch();
return out;
}
@ -82,15 +98,19 @@ S.clear= function(...signals){
});
}
};
const key_reactive= "__dde_reactive";
S.el= function(signal, map){
const mark_start= document.createComment("<#reactive>");
const mark_end= document.createComment("</#reactive>");
const mark_start= document.createComment(`<dde:reactive>`);
const mark_end= document.createComment("</dde:reactive>");
const out= document.createDocumentFragment();
out.append(mark_start, mark_end);
const { current }= scope;
const reRenderReactiveElement= v=> {
if(!mark_start.parentNode || !mark_end.parentNode)
return removeSignalListener(signal, reRenderReactiveElement);
scope.push(current);
let els= map(v);
scope.pop();
if(!Array.isArray(els))
els= [ els ];
let el_r= mark_start;
@ -107,30 +127,30 @@ S.el= function(signal, map){
import { typeOf } from './helpers.js';
export const signals_config= {
isSignal,
processReactiveAttribute(_, key, attrs, set){
processReactiveAttribute(element, key, attrs, set){
if(!isSignal(attrs)) return attrs;
const l= attr=> set(key, attr);
addSignalListener(attrs, l);
removeSignalsFromElements(attrs, l, _, key);
removeSignalsFromElements(attrs, l, element, key);
return attrs();
}
};
function removeSignalsFromElements(signal, listener, ...notes){
const { current }= scope;
if(current.prevent) return;
const k= "__dde_reactive";
current.host(function(element){
if(!element[k]){
element[k]= [];
if(!element[key_reactive]){
element[key_reactive]= [];
on.disconnected(()=>
/*!
* Clears all signals listeners added in the current scope/host (`S.el`, `assign`, …?).
* You can investigate the `__dde_reactive` key of the element.
* */
element[k].forEach(([ sl ])=> removeSignalListener(...sl, signal[mark]?.host() === element))
* You can investigate the `__dde_reactive` key of the element.
* */
element[key_reactive].forEach(([ [ signal, listener ] ])=>
removeSignalListener(signal, listener, signal[mark]?.host() === element))
)(element);
}
element[k].push([ [ signal, listener ], ...notes ]);
element[key_reactive].push([ [ signal, listener ], ...notes ]);
});
}
@ -144,6 +164,14 @@ const protoSigal= Object.assign(Object.create(null), {
this.skip= true;
}
});
class SignalDefined extends Error{
constructor(){
super();
const [ curr, ...rest ]= this.stack.split("\n");
const curr_file= curr.slice(curr.indexOf("@"), curr.indexOf(".js:")+4);
this.stack= rest.find(l=> !l.includes(curr_file));
}
}
function toSignal(signal, value, actions){
const onclear= [];
if(typeOf(actions)!=="[object Object]")
@ -156,7 +184,8 @@ function toSignal(signal, value, actions){
const { host }= scope;
signal[mark]= {
value, actions, onclear, host,
listeners: new Set()
listeners: new Set(),
defined: new SignalDefined()
};
signal.toJSON= ()=> signal();
Object.setPrototypeOf(signal[mark], protoSigal);