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langchain[minor]: Multi-file loader (langchain-ai#5584)
* Multi-file loader * Update imports, add entrypoint, format --------- Co-authored-by: jacoblee93 <[email protected]>
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docs/core_docs/docs/integrations/document_loaders/file_loaders/multi_file.mdx
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| --- | ||
| sidebar_position: 2 | ||
| hide_table_of_contents: true | ||
| --- | ||
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| # Multiple individual files | ||
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| This example goes over how to load data from multiple file paths. The second argument is a map of file extensions to loader factories. Each file will be passed to the matching loader, and the resulting documents will be concatenated together. | ||
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| Example files: | ||
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| ```text | ||
| src/document_loaders/example_data/example/ | ||
| ├── example.txt | ||
| └── example.csv | ||
| src/document_loaders/example_data/example2/ | ||
| ├── example.json | ||
| └── example.jsonl | ||
| ``` | ||
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| Example code: | ||
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| ```typescript | ||
| import { MultiFileLoader } from "langchain/document_loaders/fs/multi_file"; | ||
| import { | ||
| JSONLoader, | ||
| JSONLinesLoader, | ||
| } from "langchain/document_loaders/fs/json"; | ||
| import { TextLoader } from "langchain/document_loaders/fs/text"; | ||
| import { CSVLoader } from "langchain/document_loaders/fs/csv"; | ||
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| const loader = new MultiFileLoader( | ||
| [ | ||
| "src/document_loaders/example_data/example/example.txt", | ||
| "src/document_loaders/example_data/example/example.csv", | ||
| "src/document_loaders/example_data/example2/example.json", | ||
| "src/document_loaders/example_data/example2/example.jsonl", | ||
| ], | ||
| { | ||
| ".json": (path) => new JSONLoader(path, "/texts"), | ||
| ".jsonl": (path) => new JSONLinesLoader(path, "/html"), | ||
| ".txt": (path) => new TextLoader(path), | ||
| ".csv": (path) => new CSVLoader(path, "text"), | ||
| } | ||
| ); | ||
| const docs = await loader.load(); | ||
| console.log({ docs }); | ||
| ``` |
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| import { extname, resolve } from "node:path"; | ||
| import { stat } from "node:fs/promises"; | ||
| import { Document } from "@langchain/core/documents"; | ||
| import { BaseDocumentLoader } from "../base.js"; | ||
| import { type LoadersMapping, UnknownHandling } from "./directory.js"; | ||
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| /** | ||
| * A document loader that loads documents from multiple files. It extends the | ||
| * `BaseDocumentLoader` class and implements the `load()` method. | ||
| * @example | ||
| * ```typescript | ||
| * | ||
| * const multiFileLoader = new MultiFileLoader( | ||
| * ["path/to/file1.pdf", "path/to/file2.txt"], | ||
| * { | ||
| * ".pdf": (path: string) => new PDFLoader(path), | ||
| * }, | ||
| * ); | ||
| * | ||
| * const docs = await multiFileLoader.load(); | ||
| * console.log({ docs }); | ||
| * | ||
| * ``` | ||
| */ | ||
| export class MultiFileLoader extends BaseDocumentLoader { | ||
| constructor( | ||
| public filePaths: string[], | ||
| public loaders: LoadersMapping, | ||
| public unknown: UnknownHandling = UnknownHandling.Warn | ||
| ) { | ||
| super(); | ||
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| if (Object.keys(loaders).length === 0) { | ||
| throw new Error("Must provide at least one loader"); | ||
| } | ||
| for (const extension in loaders) { | ||
| if (Object.hasOwn(loaders, extension)) { | ||
| if (extension[0] !== ".") { | ||
| throw new Error(`Extension must start with a dot: ${extension}`); | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| /** | ||
| * Loads the documents from the provided file paths. It checks if the file | ||
| * is a directory and ignores it. If a file is a file, it checks if there | ||
| * is a corresponding loader function for the file extension in the `loaders` | ||
| * mapping. If there is, it loads the documents. If there is no | ||
| * corresponding loader function and `unknown` is set to `Warn`, it logs a | ||
| * warning message. If `unknown` is set to `Error`, it throws an error. | ||
| * @returns A promise that resolves to an array of loaded documents. | ||
| */ | ||
| public async load(): Promise<Document[]> { | ||
| const documents: Document[] = []; | ||
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| for (const filePath of this.filePaths) { | ||
| const fullPath = resolve(filePath); | ||
| const fileStat = await stat(fullPath); | ||
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| if (fileStat.isDirectory()) { | ||
| console.warn(`Ignoring directory: ${fullPath}`); | ||
| continue; | ||
| } | ||
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| const loaderFactory = this.loaders[extname(fullPath)]; | ||
| if (loaderFactory) { | ||
| const loader = loaderFactory(fullPath); | ||
| documents.push(...(await loader.load())); | ||
| } else { | ||
| switch (this.unknown) { | ||
| case UnknownHandling.Ignore: | ||
| break; | ||
| case UnknownHandling.Warn: | ||
| console.warn(`Unknown file type: ${fullPath}`); | ||
| break; | ||
| case UnknownHandling.Error: | ||
| throw new Error(`Unknown file type: ${fullPath}`); | ||
| default: | ||
| throw new Error(`Unknown unknown handling: ${this.unknown}`); | ||
| } | ||
| } | ||
| } | ||
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| return documents; | ||
| } | ||
| } |
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| import * as url from "node:url"; | ||
| import * as path from "node:path"; | ||
| import { test, expect } from "@jest/globals"; | ||
| import { MultiFileLoader } from "../fs/multi_file.js"; | ||
| import { CSVLoader } from "../fs/csv.js"; | ||
| import { PDFLoader } from "../fs/pdf.js"; | ||
| import { TextLoader } from "../fs/text.js"; | ||
| import { JSONLoader } from "../fs/json.js"; | ||
| import { UnknownHandling } from "../fs/directory.js"; | ||
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| test("Test MultiFileLoader", async () => { | ||
| const baseDirectory = path.resolve( | ||
| path.dirname(url.fileURLToPath(import.meta.url)), | ||
| "./example_data" | ||
| ); | ||
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| const filePaths = [ | ||
| path.resolve(baseDirectory, "1706.03762.pdf"), | ||
| path.resolve(baseDirectory, "Jacob_Lee_Resume_2023.pdf"), | ||
| path.resolve( | ||
| baseDirectory, | ||
| "Star_Wars_The_Clone_Wars_S06E07_Crisis_at_the_Heart.csv" | ||
| ), | ||
| path.resolve( | ||
| baseDirectory, | ||
| "Star_Wars_The_Clone_Wars_S06E07_Crisis_at_the_Heart.json" | ||
| ), | ||
| path.resolve(baseDirectory, "complex.json"), | ||
| path.resolve(baseDirectory, "example.txt"), | ||
| path.resolve(baseDirectory, "example_separator.csv"), | ||
| ]; | ||
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| const loader = new MultiFileLoader( | ||
| filePaths, | ||
| { | ||
| ".csv": (p) => { | ||
| if (p.includes("separator.csv")) { | ||
| return new CSVLoader(p, { column: "html", separator: "｜" }); | ||
| } | ||
| return new CSVLoader(p, "html"); | ||
| }, | ||
| ".pdf": (p) => new PDFLoader(p), | ||
| ".txt": (p) => new TextLoader(p), | ||
| ".json": (p) => new JSONLoader(p), | ||
| }, | ||
| UnknownHandling.Ignore | ||
| ); | ||
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| const docs = await loader.load(); | ||
| expect(docs.length).toBe(123); | ||
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| const expectedSources = [ | ||
| ...Array.from({ length: 15 }, (_) => | ||
| path.resolve(baseDirectory, "1706.03762.pdf") | ||
| ), | ||
| path.resolve(baseDirectory, "Jacob_Lee_Resume_2023.pdf"), | ||
| // CSV | ||
| ...Array.from({ length: 32 }, (_) => | ||
| path.resolve( | ||
| baseDirectory, | ||
| "Star_Wars_The_Clone_Wars_S06E07_Crisis_at_the_Heart.csv" | ||
| ) | ||
| ), | ||
| // JSON | ||
| ...Array.from({ length: 32 }, (_) => | ||
| path.resolve( | ||
| baseDirectory, | ||
| "Star_Wars_The_Clone_Wars_S06E07_Crisis_at_the_Heart.json" | ||
| ) | ||
| ), | ||
| ...Array.from({ length: 10 }, (_) => | ||
| path.resolve(baseDirectory, "complex.json") | ||
| ), | ||
| // TXT | ||
| path.resolve(baseDirectory, "example.txt"), | ||
| // CSV | ||
| ...Array.from({ length: 32 }, (_) => | ||
| path.resolve(baseDirectory, "example_separator.csv") | ||
| ), | ||
| ]; | ||
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| expect(docs.map((d) => d.metadata.source).sort()).toEqual(expectedSources); | ||
| }); |
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