86 lines
2.2 KiB
TypeScript
86 lines
2.2 KiB
TypeScript
import { EventEmitter } from 'events'
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import Entity from './entity'
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/**
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* Parser
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* Parse response data in streaming.
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**/
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export class Parser extends EventEmitter {
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private message: string
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constructor() {
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super()
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this.message = ''
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}
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public parse(chunk: string) {
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// skip heartbeats
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if (chunk === ':thump\n') {
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this.emit('heartbeat', {})
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return
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}
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this.message += chunk
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chunk = this.message
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const size: number = chunk.length
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let start: number = 0
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let offset: number = 0
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let curr: string | undefined
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let next: string | undefined
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while (offset < size) {
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curr = chunk[offset]
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next = chunk[offset + 1]
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if (curr === '\n' && next === '\n') {
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const piece: string = chunk.slice(start, offset)
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offset += 2
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start = offset
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if (!piece.length) continue // empty object
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const root: Array<string> = piece.split('\n')
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// should never happen, as long as mastodon doesn't change API messages
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if (root.length !== 2) continue
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// remove event and data markers
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const event: string = root[0].substr(7)
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const data: string = root[1].substr(6)
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let jsonObj = {}
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try {
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jsonObj = JSON.parse(data)
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} catch (err) {
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// delete event does not have json object
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if (event !== 'delete') {
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this.emit('error', new Error(`Error parsing API reply: '${piece}', error message: '${err}'`))
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continue
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}
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}
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switch (event) {
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case 'update':
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this.emit('update', jsonObj as Entity.Status)
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break
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case 'notification':
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this.emit('notification', jsonObj as Entity.Notification)
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break
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case 'conversation':
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this.emit('conversation', jsonObj as Entity.Conversation)
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break
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case 'delete':
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// When delete, data is an ID of the deleted status
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this.emit('delete', data)
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break
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default:
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this.emit('error', new Error(`Unknown event has received: ${event}`))
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continue
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}
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}
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offset++
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}
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this.message = chunk.slice(start, size)
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}
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}
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