@tldraw/editor/dist-esm/lib/editor/derivations/bindingsIndex.mjs.map

tldraw infinite canvas SDK (editor).

{
  "version": 3,
  "sources": ["../../../../src/lib/editor/derivations/bindingsIndex.ts"],
  "sourcesContent": ["import { Computed, RESET_VALUE, computed, isUninitialized } from '@tldraw/state'\nimport { TLArrowBinding, TLBinding, TLShapeId, TLUnknownBinding } from '@tldraw/tlschema'\nimport { objectMapValues } from '@tldraw/utils'\nimport { Editor } from '../Editor'\n\ntype TLBindingsIndex = Map<TLShapeId, TLBinding[]>\n\nfunction fromScratch(bindingsQuery: Computed<(TLArrowBinding | TLUnknownBinding)[], unknown>) {\n\tconst allBindings = bindingsQuery.get() as TLBinding[]\n\n\tconst shapesToBindings: TLBindingsIndex = new Map()\n\n\tfor (const binding of allBindings) {\n\t\tconst { fromId, toId } = binding\n\t\tconst bindingsForFromShape = shapesToBindings.get(fromId)\n\t\tif (!bindingsForFromShape) {\n\t\t\tshapesToBindings.set(fromId, [binding])\n\t\t} else {\n\t\t\tbindingsForFromShape.push(binding)\n\t\t}\n\t\tconst bindingsForToShape = shapesToBindings.get(toId)\n\t\tif (!bindingsForToShape) {\n\t\t\tshapesToBindings.set(toId, [binding])\n\t\t} else {\n\t\t\tbindingsForToShape.push(binding)\n\t\t}\n\t}\n\n\treturn shapesToBindings\n}\n\nexport const bindingsIndex = (editor: Editor): Computed<TLBindingsIndex> => {\n\tconst { store } = editor\n\tconst bindingsHistory = store.query.filterHistory('binding')\n\tconst bindingsQuery = store.query.records('binding')\n\n\treturn computed<TLBindingsIndex>('arrowBindingsIndex', (_lastValue, lastComputedEpoch) => {\n\t\tif (isUninitialized(_lastValue)) {\n\t\t\treturn fromScratch(bindingsQuery)\n\t\t}\n\n\t\tconst lastValue = _lastValue\n\n\t\tconst diff = bindingsHistory.getDiffSince(lastComputedEpoch)\n\n\t\tif (diff === RESET_VALUE) {\n\t\t\treturn fromScratch(bindingsQuery)\n\t\t}\n\n\t\tlet nextValue: TLBindingsIndex | undefined = undefined\n\n\t\tfunction removingBinding(binding: TLBinding) {\n\t\t\tnextValue ??= new Map(lastValue)\n\t\t\tconst prevFrom = nextValue.get(binding.fromId)\n\t\t\tconst nextFrom = prevFrom?.filter((b) => b.id !== binding.id)\n\t\t\tif (!nextFrom?.length) {\n\t\t\t\tnextValue.delete(binding.fromId)\n\t\t\t} else {\n\t\t\t\tnextValue.set(binding.fromId, nextFrom)\n\t\t\t}\n\t\t\tconst prevTo = nextValue.get(binding.toId)\n\t\t\tconst nextTo = prevTo?.filter((b) => b.id !== binding.id)\n\t\t\tif (!nextTo?.length) {\n\t\t\t\tnextValue.delete(binding.toId)\n\t\t\t} else {\n\t\t\t\tnextValue.set(binding.toId, nextTo)\n\t\t\t}\n\t\t}\n\n\t\tfunction ensureNewArray(shapeId: TLShapeId) {\n\t\t\tnextValue ??= new Map(lastValue)\n\n\t\t\tlet result = nextValue.get(shapeId)\n\t\t\tif (!result) {\n\t\t\t\tresult = []\n\t\t\t\tnextValue.set(shapeId, result)\n\t\t\t} else if (result === lastValue.get(shapeId)) {\n\t\t\t\tresult = result.slice(0)\n\t\t\t\tnextValue.set(shapeId, result)\n\t\t\t}\n\t\t\treturn result\n\t\t}\n\n\t\tfunction addBinding(binding: TLBinding) {\n\t\t\tensureNewArray(binding.fromId).push(binding)\n\t\t\tensureNewArray(binding.toId).push(binding)\n\t\t}\n\n\t\tfor (const changes of diff) {\n\t\t\tfor (const newBinding of objectMapValues(changes.added)) {\n\t\t\t\taddBinding(newBinding)\n\t\t\t}\n\n\t\t\tfor (const [prev, next] of objectMapValues(changes.updated)) {\n\t\t\t\tremovingBinding(prev)\n\t\t\t\taddBinding(next)\n\t\t\t}\n\n\t\t\tfor (const prev of objectMapValues(changes.removed)) {\n\t\t\t\tremovingBinding(prev)\n\t\t\t}\n\t\t}\n\n\t\t// TODO: add diff entries if we need them\n\t\treturn nextValue ?? lastValue\n\t})\n}\n"],
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