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import { INode, INodeData, INodeParams } from '../../../src/Interface'
import { TextSplitter } from 'langchain/text_splitter'
import { TextLoader } from 'langchain/document_loaders/fs/text'
class Text_DocumentLoaders implements INode {
label: string
name: string
description: string
type: string
icon: string
category: string
baseClasses: string[]
inputs: INodeParams[]
constructor() {
this.label = 'Text File'
this.name = 'textFile'
this.type = 'Document'
this.icon = 'textFile.svg'
this.category = 'Document Loaders'
this.description = `Load data from text files`
this.baseClasses = [this.type]
this.inputs = [
{
label: 'Txt File',
name: 'txtFile',
type: 'file',
fileType: '.txt'
},
{
label: 'Text Splitter',
name: 'textSplitter',
type: 'TextSplitter',
optional: true
},
{
label: 'Metadata',
name: 'metadata',
type: 'json',
optional: true,
additionalParams: true
}
]
}
async init(nodeData: INodeData): Promise<any> {
const textSplitter = nodeData.inputs?.textSplitter as TextSplitter
const txtFileBase64 = nodeData.inputs?.txtFile as string
const metadata = nodeData.inputs?.metadata
let alldocs = []
let files: string[] = []
if (txtFileBase64.startsWith('[') && txtFileBase64.endsWith(']')) {
files = JSON.parse(txtFileBase64)
} else {
files = [txtFileBase64]
}
for (const file of files) {
const splitDataURI = file.split(',')
splitDataURI.pop()
const bf = Buffer.from(splitDataURI.pop() || '', 'base64')
const blob = new Blob([bf])
const loader = new TextLoader(blob)
if (textSplitter) {
const docs = await loader.loadAndSplit(textSplitter)
alldocs.push(...docs)
} else {
const docs = await loader.load()
alldocs.push(...docs)
}
}
if (metadata) {
const parsedMetadata = typeof metadata === 'object' ? metadata : JSON.parse(metadata)
let finaldocs = []
for (const doc of alldocs) {
const newdoc = {
...doc,
metadata: {
...doc.metadata,
...parsedMetadata
}
}
finaldocs.push(newdoc)
}
return finaldocs
}
return alldocs
}
}
module.exports = { nodeClass: Text_DocumentLoaders }
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