148 lines
5.0 KiB
TypeScript
148 lines
5.0 KiB
TypeScript
import { omit } from 'lodash'
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import { IDocument, 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: 'Additional Metadata',
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name: 'metadata',
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type: 'json',
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description: 'Additional metadata to be added to the extracted documents',
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optional: true,
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additionalParams: true
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},
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{
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label: 'Omit Metadata Keys',
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name: 'omitMetadataKeys',
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type: 'string',
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rows: 4,
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description:
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'Each document loader comes with a default set of metadata keys that are extracted from the document. You can use this field to omit some of the default metadata keys. The value should be a list of keys, seperated by comma. Use * to omit all metadata keys execept the ones you specify in the Additional Metadata field',
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placeholder: 'key1, key2, key3.nestedKey1',
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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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const _omitMetadataKeys = nodeData.inputs?.omitMetadataKeys as string
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let omitMetadataKeys: string[] = []
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if (_omitMetadataKeys) {
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omitMetadataKeys = _omitMetadataKeys.split(',').map((key) => key.trim())
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}
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let docs: IDocument[] = []
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if (textSplitter) {
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docs.push(...(await textSplitter.createDocuments([text])))
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} else {
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docs.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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if (metadata) {
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const parsedMetadata = typeof metadata === 'object' ? metadata : JSON.parse(metadata)
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docs = docs.map((doc) => ({
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...doc,
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metadata:
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_omitMetadataKeys === '*'
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? {
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...parsedMetadata
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}
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: omit(
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{
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...doc.metadata,
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...parsedMetadata
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},
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omitMetadataKeys
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)
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}))
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} else {
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docs = docs.map((doc) => ({
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...doc,
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metadata:
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_omitMetadataKeys === '*'
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? {}
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: omit(
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{
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...doc.metadata
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},
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omitMetadataKeys
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)
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}))
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}
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if (output === 'document') {
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return docs
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} else {
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let finaltext = ''
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for (const doc of docs) {
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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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