File size: 7,209 Bytes
3e05655 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 | import MarkdownWorkerUrl from "./markdown.worker.ts?worker&url"
import {
applyMarkdownWorkerResponse,
shouldReleaseMarkdownWorkerState,
type MarkdownWorkerRequest,
type MarkdownWorkerResponse,
type MarkdownWorkerState,
} from "./markdown-worker-protocol"
import { createWorkerTransport } from "./markdown-worker-transport"
import type { Projection } from "./markdown-stream"
type HighlightPending = {
key: string
complete: boolean
resolve: (state: MarkdownWorkerState) => void
reject: (error: Error) => void
}
type ProjectPending = {
key: string
resolve: (projection: Projection) => void
reject: (error: Error) => void
}
type ParsePending = {
resolve: (html: string) => void
reject: (error: Error) => void
}
let worker: Worker | undefined
let disabled: Error | undefined
let nextID = 0
const pending = new Map<number, HighlightPending>()
const projects = new Map<number, ProjectPending>()
const parses = new Map<number, ParsePending>()
const states = new Map<string, MarkdownWorkerState>()
const keys = new Set<string>()
const latest = new Map<string, number>()
const transport = createWorkerTransport<Extract<MarkdownWorkerRequest, { type: "highlight" }>>({
post: (request) => worker!.postMessage(request),
supersede: (request) => {
const result = pending.get(request.id)
if (!result) return
pending.delete(request.id)
result.reject(new MarkdownWorkerSupersededError())
},
})
const projectTransport = createWorkerTransport<Extract<MarkdownWorkerRequest, { type: "project" }>>({
post: (request) => worker!.postMessage(request),
supersede: (request) => {
const result = projects.get(request.id)
if (!result) return
projects.delete(request.id)
result.reject(new MarkdownWorkerSupersededError())
},
})
export function parseMarkdown(text: string) {
const instance = getWorker()
const id = ++nextID
return new Promise<string>((resolve, reject) => {
parses.set(id, { resolve, reject })
instance.postMessage({ type: "parse", id, text } satisfies MarkdownWorkerRequest)
})
}
export function projectMarkdown(key: string, text: string, live: boolean) {
getWorker()
const id = ++nextID
return new Promise<Projection>((resolve, reject) => {
projects.set(id, { key, resolve, reject })
projectTransport.send({ type: "project", id, key, text, live })
})
}
export function disposeMarkdownProjection(key: string) {
projectTransport.dispose(key)
projects.forEach((request, id) => {
if (request.key !== key) return
projects.delete(id)
request.reject(new MarkdownWorkerDisposedError())
})
worker?.postMessage({ type: "dispose", key } satisfies MarkdownWorkerRequest)
}
export function highlightStreamingCode(key: string, text: string, language: string, complete = false) {
const instance = getWorker()
const id = ++nextID
latest.set(key, id)
keys.delete(key)
keys.add(key)
if (keys.size > 200) disposeStreamingCode(keys.values().next().value!)
return new Promise<MarkdownWorkerState>((resolve, reject) => {
pending.set(id, { key, complete, resolve, reject })
transport.send({ type: "highlight", id, key, text, language, complete })
})
}
export function disposeStreamingCode(key: string) {
keys.delete(key)
latest.delete(key)
states.delete(key)
transport.dispose(key)
pending.forEach((request, id) => {
if (request.key !== key) return
pending.delete(id)
request.reject(new MarkdownWorkerDisposedError())
})
worker?.postMessage({ type: "dispose", key } satisfies MarkdownWorkerRequest)
}
export class MarkdownWorkerDisposedError extends Error {}
export class MarkdownWorkerSupersededError extends Error {}
export class MarkdownWorkerUnavailableError extends Error {}
function getWorker() {
if (worker) return worker
if (disabled) throw new MarkdownWorkerUnavailableError(disabled.message)
try {
worker = new Worker(MarkdownWorkerUrl, { type: "module" })
} catch (error) {
disabled = error instanceof Error ? error : new Error(String(error))
throw new MarkdownWorkerUnavailableError(disabled.message)
}
worker.onmessage = (event: MessageEvent<MarkdownWorkerResponse>) => {
if (event.data.type === "parse") {
const result = parses.get(event.data.id)
if (!result) return
parses.delete(event.data.id)
result.resolve(event.data.html)
return
}
if (event.data.type === "project") {
const result = projects.get(event.data.id)
if (!result) {
projectTransport.complete(event.data.key, event.data.id)
return
}
projects.delete(event.data.id)
result.resolve(event.data.projection)
projectTransport.complete(event.data.key, event.data.id)
return
}
if (event.data.type === "error") {
const parsed = parses.get(event.data.id)
if (parsed) {
parses.delete(event.data.id)
parsed.reject(new Error(event.data.message))
return
}
const projected = projects.get(event.data.id)
if (projected) {
projects.delete(event.data.id)
projected.reject(new Error(event.data.message))
projectTransport.complete(projected.key, event.data.id)
return
}
}
if (event.data.type === "superseded") {
const projected = projects.get(event.data.id)
if (projected) {
projects.delete(event.data.id)
projected.reject(new MarkdownWorkerSupersededError())
projectTransport.complete(projected.key, event.data.id)
return
}
}
const key = event.data.key
if (!key) return
const result = pending.get(event.data.id)
if (!result) {
transport.complete(key, event.data.id)
return
}
pending.delete(event.data.id)
if (!keys.has(key)) {
result.reject(new MarkdownWorkerDisposedError())
transport.complete(key, event.data.id)
return
}
if (event.data.type === "superseded") {
result.reject(new MarkdownWorkerSupersededError())
transport.complete(key, event.data.id)
return
}
if (event.data.type === "error") {
result.reject(new Error(event.data.message))
transport.complete(key, event.data.id)
return
}
const state = applyMarkdownWorkerResponse(states.get(key), event.data)
if (shouldReleaseMarkdownWorkerState(result.complete, latest.get(key), event.data.id)) {
states.delete(key)
keys.delete(key)
latest.delete(key)
} else states.set(key, state)
result.resolve(state)
transport.complete(key, event.data.id)
}
const fail = (message: string) => {
const error = new Error(message)
disabled = error
transport.reset()
projectTransport.reset()
pending.forEach((request) => request.reject(error))
projects.forEach((request) => request.reject(error))
parses.forEach((request) => request.reject(error))
pending.clear()
projects.clear()
parses.clear()
states.clear()
keys.clear()
latest.clear()
worker?.terminate()
worker = undefined
}
worker.onerror = (event) => fail(event.message || "Markdown highlighting worker failed")
worker.onmessageerror = () => fail("Markdown worker response failed")
return worker
}
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