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Co-authored-by: Aditi Khare <106987683+aditi-khare-mongoDB@users.noreply.github.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,145 @@ | ||
| import { type Code } from '../../code'; | ||
| import { type BSONElement, getSize, parseToElements } from './parse_to_elements'; | ||
|
|
||
| /** @internal */ | ||
| const DEFAULT_REVIVER: BSONReviver = ( | ||
| _bytes: Uint8Array, | ||
| _container: Container, | ||
| _element: BSONElement | ||
| ) => null; | ||
|
|
||
| /** @internal */ | ||
| function parseToElementsToArray(bytes: Uint8Array, offset?: number | null): BSONElement[] { | ||
| const res = parseToElements(bytes, offset); | ||
| return Array.isArray(res) ? res : [...res]; | ||
| } | ||
|
|
||
| /** @internal */ | ||
| type ParseContext = { | ||
| elementOffset: number; | ||
| elements: BSONElement[]; | ||
| container: Container; | ||
| previous: ParseContext | null; | ||
| }; | ||
|
|
||
| /** | ||
| * @experimental | ||
| * @public | ||
| * A union of the possible containers for BSON elements. | ||
| * | ||
| * Depending on kind, a reviver can accurately assign a value to a name on the container. | ||
| */ | ||
| export type Container = | ||
| | { | ||
| dest: Record<string, unknown>; | ||
| kind: 'object'; | ||
| } | ||
| | { | ||
| dest: Map<string, unknown>; | ||
| kind: 'map'; | ||
| } | ||
| | { | ||
| dest: Array<unknown>; | ||
| kind: 'array'; | ||
| } | ||
| | { | ||
| dest: Code; | ||
| kind: 'code'; | ||
| } | ||
| | { | ||
| kind: 'custom'; | ||
| // eslint-disable-next-line @typescript-eslint/no-explicit-any | ||
| dest: any; | ||
| // eslint-disable-next-line @typescript-eslint/no-explicit-any | ||
| [key: string]: any; | ||
| }; | ||
|
|
||
| /** | ||
| * @experimental | ||
| * @public | ||
| */ | ||
| export type BSONReviver = ( | ||
| bytes: Uint8Array, | ||
| container: Container, | ||
| element: BSONElement | ||
| ) => Container | null; | ||
|
|
||
| /** | ||
| * @experimental | ||
| * @public | ||
| */ | ||
| export function parseToStructure< | ||
| TRoot extends Container = { | ||
| dest: Record<string, unknown>; | ||
| kind: 'object'; | ||
| } | ||
| >( | ||
| bytes: Uint8Array, | ||
| startOffset?: number | null, | ||
| pRoot?: TRoot | null, | ||
| pReviver?: BSONReviver | null | ||
| ): TRoot extends undefined ? Record<string, unknown> : TRoot['dest'] { | ||
| const root = pRoot ?? { | ||
| kind: 'object', | ||
| dest: Object.create(null) as Record<string, unknown> | ||
| }; | ||
|
|
||
| const reviver = pReviver ?? DEFAULT_REVIVER; | ||
|
|
||
| let ctx: ParseContext | null = { | ||
| elementOffset: 0, | ||
| elements: parseToElementsToArray(bytes, startOffset), | ||
| container: root, | ||
| previous: null | ||
| }; | ||
|
|
||
| /** BSONElement offsets: type indicator and value offset */ | ||
| const enum BSONElementOffset { | ||
| type = 0, | ||
| offset = 3 | ||
| } | ||
|
|
||
| /** BSON Embedded types */ | ||
| const enum BSONElementType { | ||
| object = 3, | ||
| array = 4, | ||
| javascriptWithScope = 15 | ||
| } | ||
|
|
||
| embedded: while (ctx !== null) { | ||
| for ( | ||
| let bsonElement: BSONElement | undefined = ctx.elements[ctx.elementOffset++]; | ||
| bsonElement != null; | ||
| bsonElement = ctx.elements[ctx.elementOffset++] | ||
| ) { | ||
| const type = bsonElement[BSONElementOffset.type]; | ||
| const offset = bsonElement[BSONElementOffset.offset]; | ||
|
|
||
| const container = reviver(bytes, ctx.container, bsonElement); | ||
| const isEmbeddedType = | ||
| type === BSONElementType.object || | ||
| type === BSONElementType.array || | ||
| type === BSONElementType.javascriptWithScope; | ||
|
|
||
| if (container != null && isEmbeddedType) { | ||
| const docOffset: number = | ||
| type !== BSONElementType.javascriptWithScope | ||
| ? offset | ||
| : // value offset + codeSize + value int + code int | ||
| offset + getSize(bytes, offset + 4) + 4 + 4; | ||
|
|
||
| ctx = { | ||
| elementOffset: 0, | ||
| elements: parseToElementsToArray(bytes, docOffset), | ||
| container, | ||
| previous: ctx | ||
| }; | ||
|
|
||
| continue embedded; | ||
| } | ||
| } | ||
| ctx = ctx.previous; | ||
| } | ||
|
|
||
| return root.dest; | ||
| } |
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