73 lines
2.7 KiB
TypeScript
73 lines
2.7 KiB
TypeScript
import { getBaseClasses, ICommonObject, INode, INodeData, INodeParams } from '../../../src'
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import { BaseOutputParser } from 'langchain/schema/output_parser'
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import { StructuredOutputParser as LangchainStructuredOutputParser } from 'langchain/output_parsers'
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import { CATEGORY } from '../OutputParserHelpers'
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class StructuredOutputParser 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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credential: INodeParams
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constructor() {
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this.label = 'Structured Output Parser'
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this.name = 'structuredOutputParser'
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this.version = 1.0
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this.type = 'StructuredOutputParser'
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this.description = 'Parse the output of an LLM call into a given (JSON) structure.'
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this.icon = 'structure.png'
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this.category = CATEGORY
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this.baseClasses = [this.type, ...getBaseClasses(BaseOutputParser)]
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//TODO: To extend the structureType to ZodSchema
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this.inputs = [
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{
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label: 'Structure Type',
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name: 'structureType',
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type: 'options',
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options: [
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{
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label: 'Names And Descriptions',
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name: 'fromNamesAndDescriptions'
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}
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],
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default: 'fromNamesAndDescriptions'
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},
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{
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label: 'Structure',
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name: 'structure',
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type: 'string',
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rows: 4,
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placeholder:
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'{' +
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' answer: "answer to the question",\n' +
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' source: "source used to answer the question, should be a website.",\n' +
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'}'
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}
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]
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}
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// eslint-disable-next-line unused-imports/no-unused-vars
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async init(nodeData: INodeData, _: string, options: ICommonObject): Promise<any> {
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const structureType = nodeData.inputs?.structureType as string
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const structure = nodeData.inputs?.structure as string
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let parsedStructure: any | undefined = undefined
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if (structure && structureType === 'fromNamesAndDescriptions') {
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try {
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parsedStructure = JSON.parse(structure)
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return LangchainStructuredOutputParser.fromNamesAndDescriptions(parsedStructure)
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} catch (exception) {
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throw new Error('Invalid JSON in StructuredOutputParser: ' + exception)
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}
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}
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throw new Error('Error creating OutputParser.')
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}
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}
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module.exports = { nodeClass: StructuredOutputParser }
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