@tanstack/db/dist/cjs/query/compiler/select.cjs.map

A reactive client store for building super fast apps on sync

{"version":3,"file":"select.cjs","sources":["../../../../src/query/compiler/select.ts"],"sourcesContent":["import { map } from '@tanstack/db-ivm'\nimport {\n  ConditionalSelect,\n  PropRef,\n  Value as ValClass,\n  isExpressionLike,\n} from '../ir.js'\nimport { UnsafeAliasPathError } from '../../errors.js'\nimport { compileExpression, isCaseWhenConditionTrue } from './evaluators.js'\nimport type { BasicExpression, Select, SelectValueExpression } from '../ir.js'\nimport type {\n  KeyedStream,\n  NamespacedAndKeyedStream,\n  NamespacedRow,\n} from '../../types.js'\n\n/**\n * Type for operations array used in select processing\n */\ntype SelectOp =\n  | {\n      kind: `merge`\n      targetPath: Array<string>\n      source: (row: NamespacedRow) => any\n    }\n  | { kind: `field`; alias: string; compiled: (row: NamespacedRow) => any }\n  | { kind: `object`; targetPath: Array<string> }\n\n/**\n * Unwraps any Value expressions\n */\nfunction unwrapVal(input: any): any {\n  if (input instanceof ValClass) return input.value\n  return input\n}\n\nconst UNSAFE_ALIAS_SEGMENTS = new Set([`__proto__`, `prototype`, `constructor`])\n\nfunction assertSafeAliasSegments(segments: ReadonlyArray<string>): void {\n  for (const seg of segments) {\n    if (UNSAFE_ALIAS_SEGMENTS.has(seg)) {\n      throw new UnsafeAliasPathError(seg)\n    }\n  }\n}\n\n// A source spread copies enumerable own data, including user symbols. Defining\n// fields avoids invoking inherited setters for ordinary source property names.\nfunction mergeSourceFields(target: object, source: object): void {\n  for (const key of Reflect.ownKeys(source)) {\n    if (!Object.prototype.propertyIsEnumerable.call(source, key)) continue\n    defineSelectField(target, key, unwrapVal(Reflect.get(source, key)))\n  }\n}\n\n// Only containers created by this evaluation may be modified. A spread or ref\n// can borrow a source object, so copy each borrowed destination at most once.\nfunction ownedDestination(\n  result: object,\n  path: ReadonlyArray<string>,\n  owned: WeakSet<object>,\n): object {\n  let cursor = result\n  for (const segment of path) {\n    const next = Object.hasOwn(cursor, segment)\n      ? Reflect.get(cursor, segment)\n      : undefined\n    if (next != null && typeof next === `object` && owned.has(next)) {\n      cursor = next\n      continue\n    }\n    const destination = Array.isArray(next)\n      ? new Array<unknown>(next.length)\n      : {}\n    if (Array.isArray(next)) {\n      Object.setPrototypeOf(destination, Object.getPrototypeOf(next))\n    }\n    if (next != null && typeof next === `object`) {\n      mergeSourceFields(destination, next)\n    }\n    owned.add(destination)\n    defineSelectField(cursor, segment, destination)\n    cursor = destination\n  }\n  return cursor\n}\n\nfunction defineSelectField(\n  target: object,\n  key: PropertyKey,\n  value: unknown,\n): void {\n  // Owned fields are normalized data. Preserve intrinsic array-length attributes\n  // when replacing its value; only newly created fields need ordinary defaults.\n  Object.defineProperty(\n    target,\n    key,\n    Object.hasOwn(target, key)\n      ? { value }\n      : { value, enumerable: true, configurable: true, writable: true },\n  )\n}\n\n/**\n * Processes a merge operation by merging source values into the target path\n */\nfunction processMerge(\n  op: Extract<SelectOp, { kind: `merge` }>,\n  namespacedRow: NamespacedRow,\n  selectResults: Record<string, any>,\n  owned: WeakSet<object>,\n): void {\n  assertSafeAliasSegments(op.targetPath)\n  const value = op.source(namespacedRow)\n  if (value && typeof value === `object`) {\n    mergeSourceFields(\n      ownedDestination(selectResults, op.targetPath, owned),\n      value,\n    )\n  }\n}\n\n/**\n * Processes a non-merge operation by setting the field value at the specified alias path\n */\nfunction processNonMergeOp(\n  op: Extract<SelectOp, { kind: `field` }>,\n  namespacedRow: NamespacedRow,\n  selectResults: Record<string, any>,\n  owned: WeakSet<object>,\n): void {\n  // Support nested alias paths like \"meta.author.name\"\n  const path = op.alias.split(`.`)\n  assertSafeAliasSegments(path)\n  const target = ownedDestination(selectResults, path.slice(0, -1), owned)\n  defineSelectField(\n    target,\n    path[path.length - 1]!,\n    unwrapVal(op.compiled(namespacedRow)),\n  )\n}\n\nfunction evaluateSelectObject(\n  namespacedRow: NamespacedRow,\n  ops: Array<SelectOp>,\n): Record<string, unknown> {\n  const selectResults: Record<string, unknown> = {}\n  const owned = new WeakSet<object>([selectResults])\n  for (const op of ops) {\n    if (op.kind === `merge`) {\n      processMerge(op, namespacedRow, selectResults, owned)\n    } else if (op.kind === `field`) {\n      processNonMergeOp(op, namespacedRow, selectResults, owned)\n    } else {\n      assertSafeAliasSegments(op.targetPath)\n      const target = ownedDestination(\n        selectResults,\n        op.targetPath.slice(0, -1),\n        owned,\n      )\n      const destination = {}\n      owned.add(destination)\n      defineSelectField(\n        target,\n        op.targetPath[op.targetPath.length - 1]!,\n        destination,\n      )\n    }\n  }\n  return selectResults\n}\n\n/**\n * Processes a single row to generate select results\n */\nfunction processRow(\n  [key, namespacedRow]: [unknown, NamespacedRow],\n  ops: Array<SelectOp>,\n): [unknown, typeof namespacedRow & { $selected: any }] {\n  const selectResults = evaluateSelectObject(namespacedRow, ops)\n\n  // Return the namespaced row with $selected added\n  return [\n    key,\n    {\n      ...namespacedRow,\n      $selected: selectResults,\n    },\n  ] as [unknown, typeof namespacedRow & { $selected: typeof selectResults }]\n}\n\n/**\n * Processes the SELECT clause and places results in $selected\n * while preserving the original namespaced row for ORDER BY access\n */\nexport function processSelect(\n  pipeline: NamespacedAndKeyedStream,\n  select: Select,\n  _allInputs: Record<string, KeyedStream>,\n): NamespacedAndKeyedStream {\n  if (!isNestedSelectObject(select)) {\n    const compiled = compileSelectValue(select as SelectValueExpression)\n    return pipeline.pipe(\n      map(([key, namespacedRow]) => [\n        key,\n        { ...namespacedRow, $selected: compiled(namespacedRow) },\n      ]),\n    ) as NamespacedAndKeyedStream\n  }\n\n  // Build ordered operations to preserve authoring order (spreads and fields)\n  const ops: Array<SelectOp> = []\n\n  addFromObject([], select, ops)\n\n  return pipeline.pipe(map((row) => processRow(row, ops)))\n}\n\nfunction compileSelectObject(\n  obj: Record<string, any>,\n): (row: NamespacedRow) => any {\n  const ops: Array<SelectOp> = []\n  addFromObject([], obj, ops)\n\n  return (row) => evaluateSelectObject(row, ops)\n}\n\nfunction compileSelectValue(\n  value: SelectValueExpression | null | undefined,\n): (row: NamespacedRow) => any {\n  if (value == null) {\n    return () => value\n  }\n\n  if (isConditionalSelectValue(value)) {\n    return compileConditionalSelect(value)\n  }\n\n  if (value instanceof ValClass) {\n    return () => value.value\n  }\n\n  if (value.type === `includesSubquery`) {\n    return () => null\n  }\n\n  if (isNestedSelectObject(value)) {\n    return compileSelectObject(value)\n  }\n\n  if (!isExpressionLike(value)) {\n    return () => value\n  }\n\n  return compileExpression(value as BasicExpression)\n}\n\nfunction compileConditionalSelect(\n  conditional: ConditionalSelect,\n): (row: NamespacedRow) => any {\n  const branches = conditional.branches.map((branch) => ({\n    condition: compileExpression(branch.condition),\n    value: compileSelectValue(branch.value),\n  }))\n  const defaultFn =\n    conditional.defaultValue === undefined\n      ? undefined\n      : compileSelectValue(conditional.defaultValue)\n\n  return (row) => {\n    for (const branch of branches) {\n      if (isCaseWhenConditionTrue(branch.condition(row))) {\n        return branch.value(row)\n      }\n    }\n\n    return defaultFn !== undefined ? defaultFn(row) : null\n  }\n}\n\n/**\n * Helper function to check if an object is a nested select object\n *\n * .select({\n *   id: users.id,\n *   profile: { // <-- this is a nested select object\n *     name: users.name,\n *     email: users.email\n *   }\n * })\n */\nfunction isNestedSelectObject(obj: any): boolean {\n  return obj && typeof obj === `object` && !isExpressionLike(obj)\n}\n\n/**\n * Helper function to process select objects and build operations array\n */\nfunction addFromObject(\n  prefixPath: Array<string>,\n  obj: any,\n  ops: Array<SelectOp>,\n) {\n  for (const [key, value] of Object.entries(obj)) {\n    if (!key.startsWith(`__SPREAD_SENTINEL__`)) {\n      assertSafeAliasSegments(key.split(`.`))\n    }\n    if (key.startsWith(`__SPREAD_SENTINEL__`)) {\n      const rest = key.slice(`__SPREAD_SENTINEL__`.length)\n      const splitIndex = rest.lastIndexOf(`__`)\n      const pathStr = splitIndex >= 0 ? rest.slice(0, splitIndex) : rest\n      const isRefExpr =\n        value &&\n        typeof value === `object` &&\n        `type` in (value as any) &&\n        (value as any).type === `ref`\n      if (pathStr.includes(`.`) || isRefExpr) {\n        // Merge into the current destination (prefixPath) from the referenced source path\n        const targetPath = [...prefixPath]\n        const path = pathStr.split(`.`)\n        const expr = isRefExpr\n          ? (value as BasicExpression)\n          : (new PropRef(path, path[0]) as BasicExpression)\n        const compiled = compileExpression(expr)\n        ops.push({ kind: `merge`, targetPath, source: compiled })\n      } else {\n        // Table-level: pathStr is the alias; merge from namespaced row at the current prefix\n        const tableAlias = pathStr\n        const targetPath = [...prefixPath]\n        ops.push({\n          kind: `merge`,\n          targetPath,\n          source: (row) => (row as any)[tableAlias],\n        })\n      }\n      continue\n    }\n\n    const expression = value as any\n    if (isConditionalSelectValue(expression)) {\n      ops.push({\n        kind: `field`,\n        alias: [...prefixPath, key].join(`.`),\n        compiled: compileConditionalSelect(expression),\n      })\n      continue\n    }\n\n    if (expression && expression.type === `includesSubquery`) {\n      // Placeholder — field will be set to a child Collection by the output layer\n      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