55 lines
1.5 KiB
TypeScript
55 lines
1.5 KiB
TypeScript
import { parsePartialJson } from '@ai-sdk/ui-utils'
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import { z } from 'zod'
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export type DeepPartial<T> = T extends object
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? T extends Array<any>
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? T
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: { [P in keyof T]?: DeepPartial<T[P]> }
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: T
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export function removeJsonMarkdown(text: string) {
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text = text.trim()
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if (text.startsWith('```json')) {
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text = text.slice(7)
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} else if (text.startsWith('json')) {
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text = text.slice(4)
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} else if (text.startsWith('```')) {
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text = text.slice(3)
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}
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if (text.endsWith('```')) {
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text = text.slice(0, -3)
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}
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return text.trim()
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}
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/**
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* 解析流式的 JSON 数据
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* @param textStream 字符串流
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* @param _schema zod schema 用于类型验证
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* @param isValid 自定义验证函数，用于判断解析出的 JSON 是否有效
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* @returns 异步生成器，yield 解析后的数据
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*/
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export async function* parseStreamingJson<T extends z.ZodType>(
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textStream: AsyncIterable<string>,
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_schema: T,
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isValid: (value: DeepPartial<z.infer<T>>) => boolean,
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): AsyncGenerator<DeepPartial<z.infer<T>>> {
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let rawText = ''
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let isParseSuccessful = false
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for await (const chunk of textStream) {
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rawText += chunk
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const parsed = parsePartialJson(removeJsonMarkdown(rawText))
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isParseSuccessful =
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parsed.state === 'repaired-parse' || parsed.state === 'successful-parse'
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if (isParseSuccessful && isValid(parsed.value as any)) {
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yield parsed.value as DeepPartial<z.infer<T>>
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} else {
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console.debug(`Failed to parse JSON:`, rawText)
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}
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}
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return { isSuccessful: isParseSuccessful }
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}
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