state.ts

// import { State, StateObject, StateTree, Transformer } from 'mol-state';
// import { Task } from 'mol-task';
// import * as util from 'util';

// export type TypeClass = 'root' | 'shape' | 'prop'
// export interface ObjProps { label: string }
// export interface TypeInfo { name: string, class: TypeClass }

// const _obj = StateObject.factory<TypeInfo, ObjProps>()
// const _transform = Transformer.factory('test');

// export class Root extends _obj({ name: 'Root', class: 'root' }) { }
// export class Square extends _obj<{ a: number }>({ name: 'Square', class: 'shape' }) { }
// export class Circle extends _obj<{ r: number }>({ name: 'Circle', class: 'shape' }) { }
// export class Area extends _obj<{ volume: number }>({ name: 'Area', class: 'prop' }) { }

// export const CreateSquare = _transform<Root, Square, { a: number }>({
//     name: 'create-square',
//     from: [Root],
//     to: [Square],
//     apply({ params: p }) {
//         return new Square({ label: `Square a=${p.a}` }, p);
//     },
//     update({ b, newParams: p }) {
//         b.props.label = `Square a=${p.a}`
//         b.data.a = p.a;
//         return Transformer.UpdateResult.Updated;
//     }
// });

// export const CreateCircle = _transform<Root, Circle, { r: number }>({
//     name: 'create-circle',
//     from: [Root],
//     to: [Square],
//     apply({ params: p }) {
//         return new Circle({ label: `Circle r=${p.r}` }, p);
//     },
//     update({ b, newParams: p }) {
//         b.props.label = `Circle r=${p.r}`
//         b.data.r = p.r;
//         return Transformer.UpdateResult.Updated;
//     }
// });

// export const CaclArea = _transform<Square | Circle, Area, {}>({
//     name: 'calc-area',
//     from: [Square, Circle],
//     to: [Area],
//     apply({ a }) {
//         if (a instanceof Square) return new Area({ label: 'Area' }, { volume: a.data.a * a.data.a });
//         else if (a instanceof Circle) return new Area({ label: 'Area' }, { volume: a.data.r * a.data.r * Math.PI });
//         throw new Error('Unknown object type.');
//     },
//     update({ a, b }) {
//         if (a instanceof Square) b.data.volume = a.data.a * a.data.a;
//         else if (a instanceof Circle) b.data.volume = a.data.r * a.data.r * Math.PI;
//         else throw new Error('Unknown object type.');
//         return Transformer.UpdateResult.Updated;
//     }
// });

// export async function runTask<A>(t: A | Task<A>): Promise<A> {
//     if ((t as any).run) return await (t as Task<A>).run();
//     return t as A;
// }

// function hookEvents(state: State) {
//     state.events.object.created.subscribe(e => console.log('created:', e.ref));
//     state.events.object.removed.subscribe(e => console.log('removed:', e.ref));
//     state.events.object.replaced.subscribe(e => console.log('replaced:', e.ref));
//     state.events.object.cellState.subscribe(e => console.log('stateChanged:', e.ref, e.cell.status));
//     state.events.object.updated.subscribe(e => console.log('updated:', e.ref));
// }

// export async function testState() {
//     const state = State.create(new Root({ label: 'Root' }, { }));
//     hookEvents(state);

//     const tree = state.tree;
//     const builder = tree.build();
//     builder.toRoot<Root>()
//         .apply(CreateSquare, { a: 10 }, { ref: 'square' })
//         .apply(CaclArea);
//     const tree1 = builder.getTree();

//     printTTree(tree1);

//     const tree2 = StateTree.updateParams<typeof CreateSquare>(tree1, 'square', { a: 15 });
//     printTTree(tree1);
//     printTTree(tree2);

//     await state.update(tree1).run();
//     console.log('----------------');
//     console.log(util.inspect(state.cells, true, 3, true));

//     console.log('----------------');
//     const jsonString = JSON.stringify(StateTree.toJSON(tree2), null, 2);
//     const jsonData = JSON.parse(jsonString);
//     printTTree(tree2);
//     console.log(jsonString);
//     const treeFromJson = StateTree.fromJSON(jsonData);
//     printTTree(treeFromJson);

//     console.log('----------------');
//     await state.update(treeFromJson).run();
//     console.log(util.inspect(state.cells, true, 3, true));

//     console.log('----------------');

//     const sel = state.select('square');
//     console.log(sel);
// }

// testState();


// //test();

// export function printTTree(tree: StateTree) {
//     let lines: string[] = [];
//     function print(offset: string, ref: any) {
//         const t = tree.nodes.get(ref)!;
//         const tr = t;

//         const name = tr.transformer.id;
//         lines.push(`${offset}|_ (${ref}) ${name} ${tr.params ? JSON.stringify(tr.params) : ''}, v${t.version}`);
//         offset += '   ';

//         tree.children.get(ref).forEach(c => print(offset, c!));
//     }
//     print('', tree.root.ref);
//     console.log(lines.join('\n'));
// }