personal_site/frontend/node_modules/@cdklabs/tskb/lib/database.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Database = void 0;
const entity_1 = require("./entity");
const relationship_1 = require("./relationship");
class Database {
    static entitiesOnly(entities) {
        return new Database(entities, relationship_1.NO_RELATIONSHIPS);
    }
    constructor(entities, relationships) {
        this.idCtr = 0;
        this.schema = {
            ...entities,
            ...relationships({
                relationship: (fromKey, toKey) => (0, relationship_1.relationshipCollection)((id) => this.get(fromKey, id), (id) => this.get(toKey, id)),
            }),
        };
    }
    id() {
        return `${this.idCtr++}`;
    }
    /**
     * Allocate an ID and store
     */
    allocate(key, entity) {
        return this.store(key, this.e(entity));
    }
    /**
     * Store with a preallocated ID
     */
    store(key, entity) {
        const coll = this.schema[key];
        coll.add(entity);
        return entity;
    }
    /**
     * Get an entity by key
     */
    get(key, id) {
        const coll = this.schema[key];
        const ret = coll.entities.get(typeof id === 'string' ? id : id.$ref);
        if (!ret) {
            throw new Error(`No such ${String(key)}: ${id}`);
        }
        return ret;
    }
    /**
     * All entities of a given type
     */
    all(key) {
        const coll = this.schema[key];
        return Array.from(coll.entities.values());
    }
    /**
     * Lookup an entity by index
     */
    lookup(key, index, lookup, value) {
        const coll = this.schema[key];
        const ids = coll.indexes[index].lookups[lookup](value);
        return addOnlyMethod(ids.map((id) => coll.entities.get(id)), `${String(key)} with ${String(index)} ${String(lookup)} ${JSON.stringify(value)}`);
    }
    /**
     * Allocate an ID and store if the entity does not yet exist
     */
    findOrAllocate(key, index, lookup, entity) {
        const res = this.lookup(key, index, lookup, entity[index]);
        if (res.length) {
            return res.only();
        }
        return this.allocate(key, entity);
    }
    link(key, from, to, attributes) {
        const col = this.schema[key];
        col.add(from, to, attributes);
    }
    /**
     * Follow a link
     */
    follow(key, from) {
        const col = this.schema[key];
        const toLinks = col.forward.get(from.$id) ?? [];
        const ret = toLinks.map((i) => ({ entity: col.toColl(i.$id), ...removeId(i) }));
        return addOnlyMethod(ret, `${String(key)} from ${from}`);
    }
    /**
     * Follow incoming links backwards
     */
    incoming(key, to) {
        const col = this.schema[key];
        const fromIds = col.backward.get(to.$id) ?? [];
        const ret = fromIds.map((i) => ({ entity: col.fromColl(i.$id), ...removeId(i) }));
        return addOnlyMethod(ret, `${String(key)} to ${to}`);
    }
    e(entity) {
        return {
            $id: this.id(),
            ...entity,
        };
    }
    /**
     * Turn the current database collection into something that can be stored.
     */
    save() {
        return {
            idCtr: this.idCtr,
            schema: dehydrate(this.schema),
        };
        function dehydrate(x) {
            if ((0, entity_1.isEntityCollection)(x)) {
                return x.dehydrate();
            }
            if ((0, relationship_1.isRelationshipCollection)(x)) {
                return x.dehydrate();
            }
            if (Array.isArray(x)) {
                return x.map(dehydrate);
            }
            if (!!x && typeof x === 'object') {
                return Object.fromEntries(Object.entries(x).map(([k, v]) => [k, dehydrate(v)]));
            }
            return x;
        }
    }
    load(db) {
        this.idCtr = db.idCtr;
        hydrate(this.schema, db.schema);
        function hydrate(proto, x) {
            if ((0, entity_1.isEntityCollection)(proto)) {
                proto.hydrateFrom(x);
            }
            if ((0, relationship_1.isRelationshipCollection)(proto)) {
                proto.hydrateFrom(x);
            }
            if (Array.isArray(x)) {
                x.forEach(hydrate);
            }
            if (!!proto && typeof proto === 'object' && !!x && typeof x === 'object') {
                for (const [k, v] of Object.entries(proto)) {
                    const dehydratedData = x[k];
                    if (dehydratedData !== undefined) {
                        // May be missing if this is from a database created from an old version of the schema
                        hydrate(v, dehydratedData);
                    }
                }
            }
        }
    }
}
exports.Database = Database;
function removeId(x) {
    const ret = { ...x };
    delete ret.$id;
    return ret;
}
function addOnlyMethod(xs, description) {
    return Object.defineProperties(xs, {
        only: {
            enumerable: false,
            value: () => {
                if (xs.length !== 1) {
                    throw new Error(`Expected exactly 1 ${description}, found ${xs.length}`);
                }
                return xs[0];
            },
        },
    });
}
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{ Entity, EntityCollection, EntityIndex, isEntityCollection, Plain, Reference } from './entity';\nimport {\n  isRelationshipCollection,\n  NO_RELATIONSHIPS,\n  Relationship,\n  relationshipCollection,\n  RelationshipCollection,\n} from './relationship';\n\nexport interface RelationshipsBuilder<ES extends object> {\n  relationship<R extends Relationship<any, any, any>>(\n    fromKey: KeysFor<ES, EntityCollection<R['from'], any>>,\n    toKey: KeysFor<ES, EntityCollection<R['to'], any>>,\n  ): RelationshipCollection<R>;\n}\n\nexport class Database<ES extends object, RS extends object> {\n  public static entitiesOnly<ES extends object>(entities: ES): Database<ES, {}> {\n    return new Database(entities, NO_RELATIONSHIPS);\n  }\n\n  private readonly schema: ES & RS;\n  private idCtr = 0;\n\n  constructor(entities: ES, relationships: (x: RelationshipsBuilder<ES>) => RS) {\n    this.schema = {\n      ...entities,\n      ...relationships({\n        relationship: (fromKey, toKey) =>\n          relationshipCollection(\n            (id) => this.get(fromKey, id),\n            (id) => this.get(toKey, id),\n          ),\n      }),\n    };\n  }\n\n  public id() {\n    return `${this.idCtr++}`;\n  }\n\n  /**\n   * Allocate an ID and store\n   */\n  public allocate<K extends keyof ES>(key: K, entity: Plain<EntityType<ES[K]>>): EntityType<ES[K]> {\n    return this.store(key, this.e(entity));\n  }\n\n  /**\n   * Store with a preallocated ID\n   */\n  public store<K extends keyof ES>(key: K, entity: EntityType<ES[K]>): EntityType<ES[K]> {\n    const coll: EntityCollection<any> = this.schema[key] as any;\n    coll.add(entity);\n    return entity as any;\n  }\n\n  /**\n   * Get an entity by key\n   */\n  public get<K extends keyof ES>(key: K, id: string | Reference<EntityType<ES[K]>>): EntityType<ES[K]> {\n    const coll: EntityCollection<any> = this.schema[key] as any;\n    const ret = coll.entities.get(typeof id === 'string' ? id : id.$ref);\n    if (!ret) {\n      throw new Error(`No such ${String(key)}: ${id}`);\n    }\n    return ret;\n  }\n\n  /**\n   * All entities of a given type\n   */\n  public all<K extends keyof ES>(key: K): Array<EntityType<ES[K]>> {\n    const coll: EntityCollection<any> = this.schema[key] as any;\n    return Array.from(coll.entities.values());\n  }\n\n  /**\n   * Lookup an entity by index\n   */\n  public lookup<K extends keyof ES, I extends IndexNamesOf<ES[K]>>(\n    key: K,\n    index: I,\n    lookup: IndexOf<ES[K], I>['lookups'],\n    value: IndexOf<ES[K], I>['valueType'],\n  ): RichReadonlyArray<EntityType<ES[K]>> {\n    const coll: EntityCollection<any> = this.schema[key] as any;\n    const ids = (coll.indexes as any)[index].lookups[lookup](value);\n    return addOnlyMethod(\n      ids.map((id: string) => coll.entities.get(id)),\n      `${String(key)} with ${String(index)} ${String(lookup)} ${JSON.stringify(value)}`,\n    );\n  }\n\n  /**\n   * Allocate an ID and store if the entity does not yet exist\n   */\n  public findOrAllocate<K extends keyof ES, I extends keyof Plain<EntityType<ES[K]>> & IndexNamesOf<ES[K]>>(\n    key: K,\n    index: I,\n    lookup: IndexOf<ES[K], I>['lookups'],\n    entity: Plain<EntityType<ES[K]>>,\n  ): EntityType<ES[K]> {\n    const res = this.lookup(key, index, lookup, entity[index]);\n    if (res.length) {\n      return res.only();\n    }\n    return this.allocate(key, entity);\n  }\n\n  /**\n   * Record a relationship between two entities\n   *\n   * Overload to account for whether we have attributes or not.\n   */\n  public link<K extends RelWAttrs<RS>>(\n    key: K,\n    from: RelType<RS[K]>['from'],\n    to: RelType<RS[K]>['to'],\n    attributes: RelType<RS[K]>['attr'],\n  ): void;\n  public link<K extends RelWoAttrs<RS>>(key: K, from: RelType<RS[K]>['from'], to: RelType<RS[K]>['to']): void;\n  public link<K extends keyof RS>(\n    key: K,\n    from: RelType<RS[K]>['from'],\n    to: RelType<RS[K]>['to'],\n    attributes?: RelType<RS[K]>['attr'],\n  ) {\n    const col: RelationshipCollection<any> = this.schema[key] as any;\n    col.add(from, to, attributes);\n  }\n\n  /**\n   * Follow a link\n   */\n  public follow<K extends keyof RS>(\n    key: K,\n    from: RelType<RS[K]>['from'],\n  ): RichReadonlyArray<Link<RelType<RS[K]>['to'], RelType<RS[K]>['attr']>> {\n    const col: RelationshipCollection<any> = this.schema[key] as any;\n    const toLinks = col.forward.get(from.$id) ?? [];\n    const ret = toLinks.map((i) => ({ entity: col.toColl(i.$id), ...removeId(i) } as any));\n\n    return addOnlyMethod(ret, `${String(key)} from ${from}`);\n  }\n\n  /**\n   * Follow incoming links backwards\n   */\n  public incoming<K extends keyof RS>(\n    key: K,\n    to: RelType<RS[K]>['to'],\n  ): RichReadonlyArray<Link<RelType<RS[K]>['from'], RelType<RS[K]>['attr']>> {\n    const col: RelationshipCollection<any> = this.schema[key] as any;\n    const fromIds = col.backward.get(to.$id) ?? [];\n    const ret = fromIds.map((i) => ({ entity: col.fromColl(i.$id), ...removeId(i) } as any));\n\n    return addOnlyMethod(ret, `${String(key)} to ${to}`);\n  }\n\n  public e<E extends Entity>(entity: Plain<E>): E {\n    return {\n      $id: this.id(),\n      ...entity,\n    } as any;\n  }\n\n  /**\n   * Turn the current database collection into something that can be stored.\n   */\n  public save(): DehydratedDatabase {\n    return {\n      idCtr: this.idCtr,\n      schema: dehydrate(this.schema),\n    };\n\n    function dehydrate(x: unknown): any {\n      if (isEntityCollection(x)) {\n        return x.dehydrate();\n      }\n      if (isRelationshipCollection(x)) {\n        return x.dehydrate();\n      }\n      if (Array.isArray(x)) {\n        return x.map(dehydrate);\n      }\n      if (!!x && typeof x === 'object') {\n        return Object.fromEntries(Object.entries(x).map(([k, v]) => [k, dehydrate(v)]));\n      }\n      return x;\n    }\n  }\n\n  public load(db: DehydratedDatabase) {\n    this.idCtr = db.idCtr;\n    hydrate(this.schema, db.schema);\n\n    function hydrate(proto: unknown, x: unknown): void {\n      if (isEntityCollection(proto)) {\n        proto.hydrateFrom(x);\n      }\n      if (isRelationshipCollection(proto)) {\n        proto.hydrateFrom(x);\n      }\n      if (Array.isArray(x)) {\n        x.forEach(hydrate);\n      }\n      if (!!proto && typeof proto === 'object' && !!x && typeof x === 'object') {\n        for (const [k, v] of Object.entries(proto)) {\n          const dehydratedData = (x as any)[k];\n          if (dehydratedData !== undefined) {\n            // May be missing if this is from a database created from an old version of the schema\n            hydrate(v, dehydratedData);\n          }\n        }\n      }\n    }\n  }\n}\n\ninterface DehydratedDatabase {\n  readonly idCtr: number;\n  readonly schema: any;\n}\n\nfunction removeId<A extends object>(x: A): Omit<A, '$id'> {\n  const ret = { ...x };\n  delete (ret as any).$id;\n  return ret;\n}\n\nexport type Link<E, A> = { readonly entity: E } & A;\n\ntype RelWAttrs<RS> = { [K in keyof RS]: {} extends RelType<RS[K]>['attr'] ? never : K }[keyof RS];\ntype RelWoAttrs<RS> = { [K in keyof RS]: {} extends RelType<RS[K]>['attr'] ? K : never }[keyof RS];\n\n// Necessary because this type might be a union\ntype IndexNamesOf<A> = A extends EntityCollection<any> ? KeysOfUnion<A['indexes']> : never;\n\n// eslint-disable-next-line prettier/prettier\ntype IndexOf<EC, I extends IndexNamesOf<EC>> =\n  EC extends EntityCollection<any>\n  ? EC['indexes'][I] extends EntityIndex<any, infer IndexType>\n    ? {\n        valueType: IndexType;\n        lookups: keyof EC['indexes'][I]['lookups'];\n      }\n    : never\n  : never;\n\ntype EntityType<A> = A extends EntityCollection<infer B> ? B : never;\n\ntype RelType<A> = A extends RelationshipCollection<infer R> ? R : never;\n\ntype ResolveUnion<T> = T extends T ? T : never;\n\ntype KeysOfUnion<T> = keyof ResolveUnion<T>;\n\nexport type EntitiesOf<DB> = DB extends Database<infer ES, any> ? { [k in keyof ES]: EntityType<ES[k]> } : {};\n\nexport interface RichReadonlyArray<A> extends ReadonlyArray<A> {\n  /**\n   * Return the first and only element, throwing if there are != 1 elements\n   */\n  only(): A;\n}\n\nfunction addOnlyMethod<A>(xs: A[], description: string): RichReadonlyArray<A> {\n  return Object.defineProperties(xs, {\n    only: {\n      enumerable: false,\n      value: () => {\n        if (xs.length !== 1) {\n          throw new Error(`Expected exactly 1 ${description}, found ${xs.length}`);\n        }\n        return xs[0];\n      },\n    },\n  }) as any;\n}\n\n/**\n * Return the keys of an object that map to a particular type\n */\ntype KeysFor<O extends object, T> = { [k in keyof O]: O[k] extends T ? k : never }[keyof O];\n"]}