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| 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 | 1x 9x 9x 9x 9x 9x 9x 9x 12x 12x 3x 9x 9x 6x 3x | /**
* Content-type → preview-kind registry for the live-docs viewer (#1396).
*
* The doc pane renders each tab with a preview component chosen by this
* resolver. v0 ships two real renderers (markdown, code/text) plus a graceful
* fallback; richer/binary kinds (image, audio, video, pdf, docx) are deferred to
* a carve-out blocked on an AHP large-resource transport (#1428), so anything we
* can't render as text resolves to `"fallback"` rather than breaking.
*
* @module
*/
/** The preview renderer kind a document tab should use. */
export type PreviewKind = "markdown" | "code" | "fallback";
/** Markdown MIME types and extensions render via react-markdown (trusted, first-party). */
const MARKDOWN_EXTENSIONS: ReadonlySet<string> = new Set(["md", "markdown", "mdx"]);
/** Extract the lowercased file extension (without the dot) from a URI or path. */
function extensionOf(uri: string): string {
let path: string = uri;
try {
path = new URL(uri).pathname;
} catch {
// Not a URL — use the raw string.
}
const lastSlash = path.lastIndexOf("/");
const name = lastSlash >= 0 ? path.slice(lastSlash + 1) : path;
const dot = name.lastIndexOf(".");
return dot > 0 ? name.slice(dot + 1).toLowerCase() : "";
}
/**
* Resolve the preview kind for a file from its bridge-reported encoding +
* content type + URI.
*
* - Non-UTF-8 content (the bridge returns `base64` for binary) → `"fallback"`:
* v0 cannot render binary as text, and the wire can't stream large media yet
* (#1428).
* - Markdown (by MIME or extension) → `"markdown"`.
* - Everything else that arrived as text → `"code"` (CodeMirror read-only).
*
* @param encoding - The `encoding` field from the resource read (`utf-8` | `base64`).
* @param contentType - The MIME type from the resource read (may be empty).
* @param uri - The `file://` URI (used for the extension fallback).
*/
export function resolvePreviewKind(
encoding: string,
contentType: string,
uri: string,
): PreviewKind {
const normalizedEncoding = encoding.toLowerCase();
if (
normalizedEncoding !== "" &&
normalizedEncoding !== "utf-8" &&
normalizedEncoding !== "utf8"
) {
return "fallback";
}
const ext = extensionOf(uri);
if (contentType.includes("markdown") || MARKDOWN_EXTENSIONS.has(ext)) {
return "markdown";
}
return "code";
}
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