44 lines
935 B
JavaScript
44 lines
935 B
JavaScript
import { EventEmitter } from 'node:events'
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export class JSONParser extends EventEmitter {
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#buff = Buffer.from('')
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#byteLen = 0
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initLength(length) {
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this.#byteLen = length
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}
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write(buffer) {
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this.#buff = Buffer.concat([this.#buff, buffer])
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}
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end() {
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if (this.#buff.length === this.#byteLen) {
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let data = this.#buff.toString()
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let fields = data
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try {
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fields = JSON.parse(data)
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} catch (e) {
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try {
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// 非标准的json语法,尝试用 Function 解析
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fields = Function(`try{return ${data}}catch(e){}`)()
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} catch (err) {}
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}
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this.emit('field', false, fields)
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this.emit('end')
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this.#buff = null
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} else {
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this.emit(
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'error',
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new Error(
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`The uploaded data is incomplete. Expected ${
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this.#byteLen
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}, Received ${this.#buff.length} .`
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)
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)
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}
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}
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}
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