115 lines
3.5 KiB
TypeScript
115 lines
3.5 KiB
TypeScript
import { INode, INodeData, INodeOutputsValue, INodeParams } from '../../../src/Interface'
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import { TextSplitter } from 'langchain/text_splitter'
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import { Document } from '@langchain/core/documents'
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import { handleEscapeCharacters } from '../../../src'
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class PlainText_DocumentLoaders implements INode {
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label: string
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name: string
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version: number
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description: string
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type: string
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icon: string
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category: string
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baseClasses: string[]
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inputs: INodeParams[]
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outputs: INodeOutputsValue[]
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constructor() {
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this.label = 'Plain Text'
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this.name = 'plainText'
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this.version = 2.0
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this.type = 'Document'
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this.icon = 'plaintext.svg'
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this.category = 'Document Loaders'
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this.description = `Load data from plain text`
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this.baseClasses = [this.type]
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this.inputs = [
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{
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label: 'Text',
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name: 'text',
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type: 'string',
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rows: 4,
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placeholder:
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'Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua...'
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},
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{
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label: 'Text Splitter',
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name: 'textSplitter',
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type: 'TextSplitter',
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optional: true
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},
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{
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label: 'Metadata',
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name: 'metadata',
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type: 'json',
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optional: true,
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additionalParams: true
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}
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]
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this.outputs = [
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{
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label: 'Document',
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name: 'document',
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description: 'Array of document objects containing metadata and pageContent',
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baseClasses: [...this.baseClasses, 'json']
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},
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{
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label: 'Text',
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name: 'text',
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description: 'Concatenated string from pageContent of documents',
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baseClasses: ['string', 'json']
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}
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]
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}
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async init(nodeData: INodeData): Promise<any> {
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const textSplitter = nodeData.inputs?.textSplitter as TextSplitter
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const text = nodeData.inputs?.text as string
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const metadata = nodeData.inputs?.metadata
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const output = nodeData.outputs?.output as string
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let alldocs: Document<Record<string, any>>[] = []
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if (textSplitter) {
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const docs = await textSplitter.createDocuments([text])
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alldocs.push(...docs)
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} else {
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alldocs.push(
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new Document({
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pageContent: text
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})
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)
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}
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let finaldocs: Document<Record<string, any>>[] = []
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if (metadata) {
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const parsedMetadata = typeof metadata === 'object' ? metadata : JSON.parse(metadata)
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for (const doc of alldocs) {
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const newdoc = {
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...doc,
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metadata: {
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...doc.metadata,
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...parsedMetadata
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}
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}
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finaldocs.push(newdoc)
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}
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} else {
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finaldocs = alldocs
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}
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if (output === 'document') {
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return finaldocs
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} else {
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let finaltext = ''
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for (const doc of finaldocs) {
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finaltext += `${doc.pageContent}\n`
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}
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return handleEscapeCharacters(finaltext, false)
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}
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}
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}
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module.exports = { nodeClass: PlainText_DocumentLoaders }
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