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Merge pull request #290 from ItzCrazyKns/canary
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| import axios from 'axios'; | ||
| import { htmlToText } from 'html-to-text' | ||
| import { RecursiveCharacterTextSplitter } from 'langchain/text_splitter'; | ||
| import { Document } from '@langchain/core/documents'; | ||
| import pdfParse from 'pdf-parse' | ||
|
|
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| export const getDocumentsFromLinks = async ({ links }: { links: string[] }) => { | ||
| const splitter = new RecursiveCharacterTextSplitter(); | ||
|
|
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| let docs: Document[] = []; | ||
|
|
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| await Promise.all( | ||
| links.map(async (link) => { | ||
| link = | ||
| link.startsWith('http://') || link.startsWith('https://') | ||
| ? link | ||
| : `https://${link}`; | ||
|
|
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| const res = await axios.get(link, { | ||
| responseType: 'arraybuffer', | ||
| }); | ||
|
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| const isPdf = res.headers['content-type'] === 'application/pdf'; | ||
|
|
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| if (isPdf) { | ||
| const pdfText = await pdfParse(res.data) | ||
| const parsedText = pdfText.text | ||
| .replace(/(\r\n|\n|\r)/gm, ' ') | ||
| .replace(/\s+/g, ' ') | ||
| .trim(); | ||
|
|
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| const splittedText = await splitter.splitText(parsedText); | ||
| const title = 'PDF Document' | ||
|
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| const linkDocs = splittedText.map((text) => { | ||
| return new Document({ | ||
| pageContent: text, | ||
| metadata: { | ||
| title: title, | ||
| url: link, | ||
| }, | ||
| }); | ||
| }); | ||
|
|
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| docs.push(...linkDocs); | ||
| return; | ||
| } | ||
|
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| const parsedText = htmlToText(res.data.toString('utf8'), { | ||
| selectors: [ | ||
| { | ||
| selector: 'a', | ||
| options: { | ||
| ignoreHref: true, | ||
| } | ||
| }, | ||
| ] | ||
| }) | ||
| .replace(/(\r\n|\n|\r)/gm, ' ') | ||
| .replace(/\s+/g, ' ') | ||
| .trim(); | ||
|
|
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| const splittedText = await splitter.splitText(parsedText); | ||
| const title = res.data.toString('utf8').match(/<title>(.*?)<\/title>/)?.[1]; | ||
|
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| const linkDocs = splittedText.map((text) => { | ||
| return new Document({ | ||
| pageContent: text, | ||
| metadata: { | ||
| title: title || link, | ||
| url: link, | ||
| }, | ||
| }); | ||
| }); | ||
|
|
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| docs.push(...linkDocs); | ||
| }), | ||
| ); | ||
|
|
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| return docs; | ||
| }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| import { BaseOutputParser } from '@langchain/core/output_parsers'; | ||
|
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| interface LineOutputParserArgs { | ||
| key?: string; | ||
| } | ||
|
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| class LineOutputParser extends BaseOutputParser<string> { | ||
| private key = 'questions'; | ||
|
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| constructor(args?: LineOutputParserArgs) { | ||
| super(); | ||
| this.key = args.key ?? this.key; | ||
| } | ||
|
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| static lc_name() { | ||
| return 'LineOutputParser'; | ||
| } | ||
|
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| lc_namespace = ['langchain', 'output_parsers', 'line_output_parser']; | ||
|
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| async parse(text: string): Promise<string> { | ||
| const regex = /^(\s*(-|\*|\d+\.\s|\d+\)\s|\u2022)\s*)+/; | ||
| const startKeyIndex = text.indexOf(`<${this.key}>`); | ||
| const endKeyIndex = text.indexOf(`</${this.key}>`); | ||
|
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| if (startKeyIndex === -1 || endKeyIndex === -1) { | ||
| return ''; | ||
| } | ||
|
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| const questionsStartIndex = | ||
| startKeyIndex === -1 ? 0 : startKeyIndex + `<${this.key}>`.length; | ||
| const questionsEndIndex = endKeyIndex === -1 ? text.length : endKeyIndex; | ||
| const line = text | ||
| .slice(questionsStartIndex, questionsEndIndex) | ||
| .trim() | ||
| .replace(regex, ''); | ||
|
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| return line; | ||
| } | ||
|
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| getFormatInstructions(): string { | ||
| throw new Error('Not implemented.'); | ||
| } | ||
| } | ||
|
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| export default LineOutputParser; |
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