File size: 5,301 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 | /// <reference lib="webworker" />
import { ShikiStreamTokenizer } from "@shikijs/stream"
import { createMarkdownParser } from "@opencode-ai/ui/context/marked-parser"
import { OpenCodeTheme } from "@opencode-ai/ui/context/marked-theme"
import {
bundledLanguages,
createHighlighter,
getTokenStyleObject,
stringifyTokenStyle,
type BundledLanguage,
type ThemedToken,
} from "shiki"
import type { MarkdownToken, MarkdownWorkerRequest, MarkdownWorkerResponse } from "./markdown-worker-protocol"
import { createLatestWorkerQueue } from "./markdown-worker-queue"
import { project, type Projection } from "./markdown-stream"
type Stream = {
language: string
source: string
tokenizer: ShikiStreamTokenizer
}
const streams = new Map<string, Stream>()
const projections = new Map<string, Projection>()
let highlighter: ReturnType<typeof createHighlighter> | undefined
const highlightQueue = createLatestWorkerQueue<Extract<MarkdownWorkerRequest, { type: "highlight" }>>({
run: highlight,
supersede: (request) => post({ type: "superseded", id: request.id, key: request.key }),
dispose: (key) => void streams.delete(key),
})
const projectQueue = createLatestWorkerQueue<Extract<MarkdownWorkerRequest, { type: "project" }>>({
run: runProject,
supersede: (request) => post({ type: "superseded", id: request.id, key: request.key }),
dispose: (key) => void projections.delete(key),
})
const parser = createMarkdownParser(async (code, language) => {
const instance = await getHighlighter()
const name = language in bundledLanguages ? language : "text"
if (!instance.getLoadedLanguages().includes(name))
await instance.loadLanguage(bundledLanguages[name as BundledLanguage])
return instance.codeToHtml(code, { lang: name as BundledLanguage, theme: "OpenCode", tabindex: false })
})
self.onmessage = (event: MessageEvent<MarkdownWorkerRequest>) => {
if (event.data.type === "dispose") {
highlightQueue.dispose(event.data.key)
projectQueue.dispose(event.data.key)
return
}
if (event.data.type === "parse") {
void parse(event.data)
return
}
if (event.data.type === "project") {
projectQueue.highlight(event.data)
return
}
highlightQueue.highlight(event.data)
}
async function parse(request: Extract<MarkdownWorkerRequest, { type: "parse" }>) {
try {
post({ type: "parse", id: request.id, html: await parser.parse(request.text) })
} catch (error) {
post({ type: "error", id: request.id, message: error instanceof Error ? error.message : String(error) })
}
}
async function runProject(request: Extract<MarkdownWorkerRequest, { type: "project" }>) {
try {
const projection = project(projections.get(request.key), request.text, request.live)
projections.set(request.key, projection)
post({ type: "project", id: request.id, key: request.key, projection })
} catch (error) {
post({
type: "error",
id: request.id,
key: request.key,
message: error instanceof Error ? error.message : String(error),
})
}
}
async function highlight(request: Extract<MarkdownWorkerRequest, { type: "highlight" }>) {
try {
const instance = await getHighlighter()
const language = request.language in bundledLanguages ? request.language : "text"
if (!instance.getLoadedLanguages().includes(language))
await instance.loadLanguage(bundledLanguages[language as BundledLanguage])
if (request.complete) {
const result = instance.codeToTokens(request.text, { lang: language as BundledLanguage, theme: "OpenCode" })
streams.delete(request.key)
post({
type: "highlight",
id: request.id,
key: request.key,
language,
reset: true,
stable: result.tokens
.flatMap((line, index) =>
index === result.tokens.length - 1 ? line : [...line, { content: "\n", offset: 0 }],
)
.map(token),
unstable: [],
})
return
}
const previous = streams.get(request.key)
const reset = !previous || previous.language !== language || !request.text.startsWith(previous.source)
const stream = reset
? {
language,
source: "",
tokenizer: new ShikiStreamTokenizer({ highlighter: instance, lang: language, theme: "OpenCode" }),
}
: previous
const result = await stream.tokenizer.enqueue(request.text.slice(stream.source.length))
stream.source = request.text
streams.set(request.key, stream)
post({
type: "highlight",
id: request.id,
key: request.key,
language,
reset,
stable: result.stable.filter((token) => token.content.length > 0).map(token),
unstable: result.unstable.filter((token) => token.content.length > 0).map(token),
})
} catch (error) {
post({
type: "error",
id: request.id,
key: request.key,
message: error instanceof Error ? error.message : String(error),
})
}
}
function getHighlighter() {
return (highlighter ??= createHighlighter({ themes: [OpenCodeTheme], langs: [] }))
}
function post(response: MarkdownWorkerResponse) {
self.postMessage(response)
}
function token(value: ThemedToken): MarkdownToken {
return [value.content, stringifyTokenStyle(value.htmlStyle ?? getTokenStyleObject(value))]
}
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