src/component/Component.ts

@@ -1,6 +1,6 @@
 import { TAttributes } from "../html/htmldefs";
 import { ScalarVAO } from "../vao/ScalarVAO.js";
-import { AbstractVAO, Detachable, VAO, VAOConstructor } from "../vao/VAO.js";
+import { AbstractVAO, Detachable, VAO } from "../vao/VAO.js";
 import { Renderable, INotifyMounted } from "./componentdefs";
 
 // === TODO ===
@@ -13,24 +13,11 @@ import { Renderable, INotifyMounted } from "./componentdefs";
 // [F] investigate possibility of detecting/avoiding infinite recursion here
 // [G] definition of "mounted" doesn't match React. Maybe call it something
 //     else to avoid confusion.
-// [H] investigate possibility of using an AST test to ensure methods like
-//     setOrCreateVAO are called instead of re-implementing their behaviour
-// [I] VAOs should install themselves into components so they can add behaviour
-//     to the instance proxy and implement optimizations for methods like
-//     Array.prototype.push, Object.assign, etc.
-
-interface PropertyDefinition {
-    $?: VAOConstructor,
-    factory?: () => any
-}
-type TPropertyDefinitions = { [key: string]: PropertyDefinition }
 
 export abstract class Component {
     public attributes: TAttributes
     public children: Renderable[]
 
-    static properties: TPropertyDefinitions | undefined;
-
     protected renderChildren_: Renderable[] | null = null;
     protected instanceProxy_: Component | null = null;
     protected vaos_: { [name: string]: VAO }
@@ -62,37 +49,22 @@ export abstract class Component {
         this.rerenderVAOs_ = {};
         this.rerenderSubscriptions_ = [];
 
-        const constructorAsWhatItIs: typeof Component =
-            (this.constructor as unknown) as typeof Component;
-        const allProperties = constructorAsWhatItIs.allProperties_;
-
-        for ( let k in allProperties ) {
-            const property = allProperties[k];
-            const value = this.getPropertyInitialValue_(k);
-
-            if ( property.$ !== undefined ) {
-                const vao = this.createVAOFromProperty_(property, value);
-                if ( ! ( vao instanceof AbstractVAO ) ) {
-                    throw new Error('expected a VAO');
-                }
-                // TODO: [I]
-                this.vaos_[k] = vao;
-            } else {
-                this.createDynamicVAO_(k, value)
-            }
-        }
-
         for ( let k in attributes ) {
             if ( attributes[k] instanceof AbstractVAO ) {
                 this.vaos_[k] = attributes[k];
             } else {
-                this.setOrCreateVAO_(k, attributes[k]);
+                // TODO: [E]
+                const vao = new ScalarVAO(attributes[k]);
+                this.vaos_[k] = vao;
             }
         }
     }
 
     createElements (): Element[] {
         // TODO: [C]
+        for ( const detachable of this.rerenderSubscriptions_ ) {
+            detachable.detach();
+        }
 
         let renderables = this.render.call(this.instanceProxy);
 
@@ -122,8 +94,6 @@ export abstract class Component {
             throw new Error('cannot re-render a component with zero elements');
         }
 
-        this.onWillDetachFromDOM_();
-
         // The reference element lets us know where to put new elements
         const referenceElement = this.elements_[0];
 
@@ -140,36 +110,8 @@ export abstract class Component {
         })
     }
 
-    notifyWillDetachFromDOM () {
-        this.onWillDetachFromDOM_();
-    }
-    onWillDetachFromDOM_ () {
-        // Detach rerender subscriptions 
-        for ( const detachable of this.rerenderSubscriptions_ ) {
-            detachable.detach();
-        }
-
-        // Detach listeners from child renderables generated last time
-        if ( ! this.renderChildren_ ) {
-            throw new Error('tried to detach before rendering');
-        }
-        for ( const renderable of this.renderChildren_ ) {
-            renderable.notifyWillDetachFromDOM();
-        }
-    }
-
-    createDynamicVAO_ (vaoName: string, value?: any) {
-        // TODO: [E], [I]
-        this.vaos_[vaoName] = new ScalarVAO(value ?? null);
-    }
-
-    // TODO: [H]
-    setOrCreateVAO_ (vaoName: string, value: any) {
-        if ( ! this.vaos_[vaoName] ) {
-            this.createDynamicVAO_(vaoName, value);
-            return;
-        }
-        this.vaos_[vaoName].set(value);
+    createDynamicVAO_ (vaoName: string) {
+        this.vaos_[vaoName] = new ScalarVAO(null);
     }
 
     notifyMounted(event: INotifyMounted) {
@@ -230,52 +172,4 @@ export abstract class Component {
 
         return this.instanceProxy_;
     }
-
-    static allProperties__: TPropertyDefinitions | null;
-
-    static get allProperties_ () {
-        if ( this.allProperties__ ) return this.allProperties__;
-
-        const properties: TPropertyDefinitions = {};
-        let cls = this;
-        for (
-            ;
-            cls.prototype instanceof Component;
-            cls = Object.getPrototypeOf(cls)
-        ) {
-            if ( ! cls.properties ) continue;
-            for ( const k in cls.properties ) {
-                if ( properties.hasOwnProperty(k) ) {
-                    properties[k] = Object.assign(
-                        { ...cls.properties[k] }, properties[k]);
-                } else {
-                    properties[k] = cls.properties[k];
-                }
-            }
-        }
-
-        return this.allProperties__ = properties;
-    }
-
-    getPropertyInitialValue_ (k: string): any {
-        const constructorAsWhatItIs: typeof Component =
-            (this.constructor as unknown) as typeof Component;
-        const allProperties = constructorAsWhatItIs.allProperties_;
-
-        const property = allProperties[k];
-
-        if ( property.factory !== undefined ) {
-            return property.factory();
-        }
-
-        return null;
-    }
-
-    createVAOFromProperty_ (property: PropertyDefinition, initialValue: any): VAO {
-        if ( property.$ === undefined ) {
-            throw new Error('called createVAOFromProperty_ with invalid input');
-        }
-
-        return new property.$(initialValue);
-    }
 }

src/component/Tag.ts

@@ -61,12 +61,6 @@ export class Tag {
         return [el];
     }
 
-    notifyWillDetachFromDOM() {
-        for ( const axiom of this.axioms_ ) {
-            axiom.detach();
-        }
-    }
-
     notifyMounted (event: INotifyMounted) {
         console.log('notifyMounted called on a tag', this);
         if ( this.element_ == null ) {

src/component/componentdefs.ts

@@ -6,7 +6,6 @@ export interface INotifyMounted {
 
 export interface Renderable {
     createElements: () => Element[]
-    notifyWillDetachFromDOM: () => void
     notifyMounted: (event: INotifyMounted) => void
 }
 export interface RenderableConstructor {

src/vao/VAO.ts

@@ -25,10 +25,6 @@ export interface VAO {
     set (value: any): void
 }
 
-export interface VAOConstructor {
-    new (initialValue: any): VAO
-}
-
 export abstract class AbstractVAO implements VAO {
     private listeners_: TListenerList
     constructor () {