Merge pull request FlowiseAI#1011 from FlowiseAI/feature/PlainTextDocLoader

Feature/PlainText DocLoader

Author: HenryHengZJ

packages/components/nodes/documentloaders/PlainText/PlainText.ts

@@ -0,0 +1,88 @@
+import { INode, INodeData, INodeParams } from '../../../src/Interface'
+import { TextSplitter } from 'langchain/text_splitter'
+import { Document } from 'langchain/document'
+
+class PlainText_DocumentLoaders implements INode {
+    label: string
+    name: string
+    version: number
+    description: string
+    type: string
+    icon: string
+    category: string
+    baseClasses: string[]
+    inputs: INodeParams[]
+
+    constructor() {
+        this.label = 'Plain Text'
+        this.name = 'plainText'
+        this.version = 1.0
+        this.type = 'Document'
+        this.icon = 'plaintext.svg'
+        this.category = 'Document Loaders'
+        this.description = `Load data from plain text`
+        this.baseClasses = [this.type]
+        this.inputs = [
+            {
+                label: 'Text',
+                name: 'text',
+                type: 'string',
+                rows: 4,
+                placeholder:
+                    'Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua...'
+            },
+            {
+                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 text = nodeData.inputs?.text as string
+        const metadata = nodeData.inputs?.metadata
+
+        let alldocs: Document<Record<string, any>>[] = []
+
+        if (textSplitter) {
+            const docs = await textSplitter.createDocuments([text])
+            alldocs.push(...docs)
+        } else {
+            alldocs.push(
+                new Document({
+                    pageContent: text
+                })
+            )
+        }
+
+        if (metadata) {
+            const parsedMetadata = typeof metadata === 'object' ? metadata : JSON.parse(metadata)
+            let finaldocs: Document<Record<string, any>>[] = []
+            for (const doc of alldocs) {
+                const newdoc = {
+                    ...doc,
+                    metadata: {
+                        ...doc.metadata,
+                        ...parsedMetadata
+                    }
+                }
+                finaldocs.push(newdoc)
+            }
+            return finaldocs
+        }
+
+        return alldocs
+    }
+}
+
+module.exports = { nodeClass: PlainText_DocumentLoaders }