Class RecursiveCharacterTextSplitter

Abstract base class for document transformation systems.

A document transformation system takes an array of Documents and returns an array of transformed Documents. These arrays do not necessarily have to have the same length.

One example of this is a text splitter that splits a large document into many smaller documents.

Hierarchy

Implements

Constructors

Properties

chunkOverlap: number = 200
chunkSize: number = 1000
keepSeparator: boolean = false
lengthFunction: ((text) => number) | ((text) => Promise<number>)

Type declaration

    • (text): number
    • Parameters

      • text: string

      Returns number

Type declaration

    • (text): Promise<number>
    • Parameters

      • text: string

      Returns Promise<number>

separators: string[] = ...

Methods

  • Default implementation of batch, which calls invoke N times. Subclasses should override this method if they can batch more efficiently.

    Parameters

    • inputs: Document<Record<string, any>>[][]

      Array of inputs to each batch call.

    • Optional options: Partial<BaseCallbackConfig> | Partial<BaseCallbackConfig>[]

      Either a single call options object to apply to each batch call or an array for each call.

    • Optional batchOptions: RunnableBatchOptions & {
          returnExceptions?: false;
      }

    Returns Promise<Document<Record<string, any>>[][]>

    An array of RunOutputs, or mixed RunOutputs and errors if batchOptions.returnExceptions is set

  • Parameters

    Returns Promise<(Error | Document<Record<string, any>>[])[]>

  • Parameters

    Returns Promise<(Error | Document<Record<string, any>>[])[]>

  • Parameters

    Returns Promise<Document<Record<string, any>>[]>

  • Method to invoke the document transformation. This method calls the transformDocuments method with the provided input.

    Parameters

    • input: Document<Record<string, any>>[]

      The input documents to be transformed.

    • _options: BaseCallbackConfig

      Optional configuration object to customize the behavior of callbacks.

    Returns Promise<Document<Record<string, any>>[]>

    A Promise that resolves to the transformed documents.

  • Parameters

    • splits: string[]
    • separator: string

    Returns Promise<string[]>

  • Create a new runnable sequence that runs each individual runnable in series, piping the output of one runnable into another runnable or runnable-like.

    Type Parameters

    • NewRunOutput

    Parameters

    • coerceable: RunnableLike<Document<Record<string, any>>[], NewRunOutput>

      A runnable, function, or object whose values are functions or runnables.

    Returns RunnableSequence<Document<Record<string, any>>[], Exclude<NewRunOutput, Error>>

    A new runnable sequence.

  • Parameters

    • text: string

    Returns Promise<string[]>

  • Stream output in chunks.

    Parameters

    Returns Promise<IterableReadableStream<Document<Record<string, any>>[]>>

    A readable stream that is also an iterable.

  • Stream all output from a runnable, as reported to the callback system. This includes all inner runs of LLMs, Retrievers, Tools, etc. Output is streamed as Log objects, which include a list of jsonpatch ops that describe how the state of the run has changed in each step, and the final state of the run. The jsonpatch ops can be applied in order to construct state.

    Parameters

    • input: Document<Record<string, any>>[]
    • Optional options: Partial<BaseCallbackConfig>
    • Optional streamOptions: Omit<LogStreamCallbackHandlerInput, "autoClose">

    Returns AsyncGenerator<RunLogPatch, any, unknown>

  • Default implementation of transform, which buffers input and then calls stream. Subclasses should override this method if they can start producing output while input is still being generated.

    Parameters

    Returns AsyncGenerator<Document<Record<string, any>>[], any, unknown>

  • Transform a list of documents.

    Parameters

    Returns Promise<Document<Record<string, any>>[]>

    A list of transformed documents.

  • Bind lifecycle listeners to a Runnable, returning a new Runnable. The Run object contains information about the run, including its id, type, input, output, error, startTime, endTime, and any tags or metadata added to the run.

    Parameters

    • params: {
          onEnd?: ((run, config?) => void | Promise<void>);
          onError?: ((run, config?) => void | Promise<void>);
          onStart?: ((run, config?) => void | Promise<void>);
      }

      The object containing the callback functions.

      • Optional onEnd?: ((run, config?) => void | Promise<void>)
          • (run, config?): void | Promise<void>
          • Called after the runnable finishes running, with the Run object.

            Parameters

            Returns void | Promise<void>

      • Optional onError?: ((run, config?) => void | Promise<void>)
          • (run, config?): void | Promise<void>
          • Called if the runnable throws an error, with the Run object.

            Parameters

            Returns void | Promise<void>

      • Optional onStart?: ((run, config?) => void | Promise<void>)
          • (run, config?): void | Promise<void>
          • Called before the runnable starts running, with the Run object.

            Parameters

            Returns void | Promise<void>

    Returns Runnable<Document<Record<string, any>>[], Document<Record<string, any>>[], BaseCallbackConfig>

  • Parameters

    • language: "cpp" | "go" | "java" | "js" | "php" | "proto" | "python" | "rst" | "ruby" | "rust" | "scala" | "swift" | "markdown" | "latex" | "html" | "sol"

    Returns string[]

  • Parameters

    • text: string
    • separator: string

    Returns string[]

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