Function highlight

packages/codehike/src/code/highlight.ts:20–60

(
  data: RawCode,
  theme: Theme,
  config: { annotationPrefix?: string } = {},
)

type AnyToken = Token | Whitespace

export async function highlight(
  data: RawCode,
  theme: Theme,
  config: { annotationPrefix?: string } = {},
): Promise<HighlightedCode> {
  let { value, lang = "txt" } = data

  if (!LANG_NAMES.includes(lang)) {
    console.warn(`Code Hike warning: Unknown language "${lang}"`)
    lang = "txt"
  }

  const { code, annotations } = await splitAnnotationsAndCode(
    value,
    lang,
    config.annotationPrefix || "!",
  )
  const {
    lines,
    lang: lighterLang,
    style,
  } = await lighter(code, lang, theme as any, {
    annotations: [],
    scopes: false, // true for better token transitions, but breaks css themes
  })

  const tokens = joinLines(lines)
  // split surrounding whitespace for each token
  const splitTokens = splitWhitespace(tokens)
  // join consecutive whitespace tokens
  const joinedTokens = joinWhitespace(splitTokens)
  return {
    ...data,
    code,
    tokens: joinedTokens,
    lang: lighterLang,
    annotations: compatAnnotations(annotations),
    themeName: typeof theme === "string" ? theme : theme?.name || "unknown",
    style,
  }
}

function compatAnnotations(annotations: any[]): CodeAnnotation[] {
  const newAnnotations: CodeAnnotation[] = []