@tldraw/store/dist-esm/lib/AtomMap.mjs.map

tldraw infinite canvas SDK (store).

{
  "version": 3,
  "sources": ["../../src/lib/AtomMap.ts"],
  "sourcesContent": ["import { atom, Atom, transact, UNINITIALIZED } from '@tldraw/state'\nimport { assert } from '@tldraw/utils'\nimport { emptyMap, ImmutableMap } from './ImmutableMap'\n\n/**\n * A drop-in replacement for Map that stores values in atoms and can be used in reactive contexts.\n * @public\n */\nexport class AtomMap<K, V> implements Map<K, V> {\n\tprivate atoms: Atom<ImmutableMap<K, Atom<V | UNINITIALIZED>>>\n\n\tconstructor(\n\t\tprivate readonly name: string,\n\t\tentries?: Iterable<readonly [K, V]>\n\t) {\n\t\tlet atoms = emptyMap<K, Atom<V>>()\n\t\tif (entries) {\n\t\t\tatoms = atoms.withMutations((atoms) => {\n\t\t\t\tfor (const [k, v] of entries) {\n\t\t\t\t\tatoms.set(k, atom(`${name}:${String(k)}`, v))\n\t\t\t\t}\n\t\t\t})\n\t\t}\n\t\tthis.atoms = atom(`${name}:atoms`, atoms)\n\t}\n\n\t/** @internal */\n\tgetAtom(key: K): Atom<V | UNINITIALIZED> | undefined {\n\t\tconst valueAtom = this.atoms.__unsafe__getWithoutCapture().get(key)\n\t\tif (!valueAtom) {\n\t\t\t// if the value is missing, we want to track whether it's in the present keys set\n\t\t\tthis.atoms.get()\n\t\t\treturn undefined\n\t\t}\n\t\treturn valueAtom\n\t}\n\n\tget(key: K): V | undefined {\n\t\tconst value = this.getAtom(key)?.get()\n\t\tassert(value !== UNINITIALIZED)\n\t\treturn value\n\t}\n\n\t__unsafe__getWithoutCapture(key: K): V | undefined {\n\t\tconst valueAtom = this.atoms.__unsafe__getWithoutCapture().get(key)\n\t\tif (!valueAtom) return undefined\n\t\tconst value = valueAtom.__unsafe__getWithoutCapture()\n\t\tassert(value !== UNINITIALIZED)\n\t\treturn value\n\t}\n\n\thas(key: K): boolean {\n\t\tconst valueAtom = this.getAtom(key)\n\t\tif (!valueAtom) {\n\t\t\treturn false\n\t\t}\n\t\treturn valueAtom.get() !== UNINITIALIZED\n\t}\n\n\t__unsafe__hasWithoutCapture(key: K): boolean {\n\t\tconst valueAtom = this.atoms.__unsafe__getWithoutCapture().get(key)\n\t\tif (!valueAtom) return false\n\t\tassert(valueAtom.__unsafe__getWithoutCapture() !== UNINITIALIZED)\n\t\treturn true\n\t}\n\n\tset(key: K, value: V) {\n\t\tconst existingAtom = this.atoms.__unsafe__getWithoutCapture().get(key)\n\t\tif (existingAtom) {\n\t\t\texistingAtom.set(value)\n\t\t} else {\n\t\t\tthis.atoms.update((atoms) => {\n\t\t\t\treturn atoms.set(key, atom(`${this.name}:${String(key)}`, value))\n\t\t\t})\n\t\t}\n\t\treturn this\n\t}\n\n\tupdate(key: K, updater: (value: V) => V) {\n\t\tconst valueAtom = this.atoms.__unsafe__getWithoutCapture().get(key)\n\t\tif (!valueAtom) {\n\t\t\tthrow new Error(`AtomMap: key ${key} not found`)\n\t\t}\n\t\tconst value = valueAtom.__unsafe__getWithoutCapture()\n\t\tassert(value !== UNINITIALIZED)\n\t\tvalueAtom.set(updater(value))\n\t}\n\n\tdelete(key: K) {\n\t\tconst valueAtom = this.atoms.__unsafe__getWithoutCapture().get(key)\n\t\tif (!valueAtom) {\n\t\t\treturn false\n\t\t}\n\n\t\ttransact(() => {\n\t\t\tvalueAtom.set(UNINITIALIZED)\n\t\t\tthis.atoms.update((atoms) => {\n\t\t\t\treturn atoms.delete(key)\n\t\t\t})\n\t\t})\n\t\treturn true\n\t}\n\n\tdeleteMany(keys: Iterable<K>): [K, V][] {\n\t\treturn transact(() => {\n\t\t\tconst deleted: [K, V][] = []\n\t\t\tconst newAtoms = this.atoms.get().withMutations((atoms) => {\n\t\t\t\tfor (const key of keys) {\n\t\t\t\t\tconst valueAtom = atoms.get(key)\n\t\t\t\t\tif (!valueAtom) continue\n\t\t\t\t\tconst oldValue = valueAtom.get()\n\t\t\t\t\tassert(oldValue !== UNINITIALIZED)\n\n\t\t\t\t\tdeleted.push([key, oldValue])\n\n\t\t\t\t\tatoms.delete(key)\n\t\t\t\t\tvalueAtom.set(UNINITIALIZED)\n\t\t\t\t}\n\t\t\t})\n\n\t\t\tif (deleted.length) {\n\t\t\t\tthis.atoms.set(newAtoms)\n\t\t\t}\n\n\t\t\treturn deleted\n\t\t})\n\t}\n\n\tclear() {\n\t\treturn transact(() => {\n\t\t\tfor (const valueAtom of this.atoms.__unsafe__getWithoutCapture().values()) {\n\t\t\t\tvalueAtom.set(UNINITIALIZED)\n\t\t\t}\n\t\t\tthis.atoms.set(emptyMap())\n\t\t})\n\t}\n\n\t*entries(): Generator<[K, V], undefined, unknown> {\n\t\tfor (const [key, valueAtom] of this.atoms.get()) {\n\t\t\tconst value = valueAtom.get()\n\t\t\tassert(value !== UNINITIALIZED)\n\t\t\tyield [key, value]\n\t\t}\n\t}\n\n\t*keys(): Generator<K, undefined, unknown> {\n\t\tfor (const key of this.atoms.get().keys()) {\n\t\t\tyield key\n\t\t}\n\t}\n\n\t*values(): Generator<V, undefined, unknown> {\n\t\tfor (const valueAtom of this.atoms.get().values()) {\n\t\t\tconst value = valueAtom.get()\n\t\t\tassert(value !== UNINITIALIZED)\n\t\t\tyield value\n\t\t}\n\t}\n\n\t// eslint-disable-next-line no-restricted-syntax\n\tget size() {\n\t\treturn this.atoms.get().size\n\t}\n\n\tforEach(callbackfn: (value: V, key: K, map: AtomMap<K, V>) => void, thisArg?: any): void {\n\t\tfor (const [key, value] of this.entries()) {\n\t\t\tcallbackfn.call(thisArg, value, key, this)\n\t\t}\n\t}\n\n\t[Symbol.iterator]() {\n\t\treturn this.entries()\n\t}\n\n\t[Symbol.toStringTag] = 'AtomMap'\n}\n"],
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  "names": ["atoms"]
}