The current date is {new Date().toString()}.
```
which isn't quite a valid JSX expression, but will
be if you wrap it in an outer `` is now actually treated as JSX and not HTML, even though
it's also a standard HTML tag and would be treated as HTML by a normal
Markdown parser.
Again, the render output is not valid HTML in itself -- you'll
probably want to wrap a React component declaration around that outer
``, run that through Babel or TypeScript to make it runnable JS,
then use React to actually render the component to a browser
DOM. (Here, you'd need to define the `Doubler` component, too.)
See [example/render.js](example/render.js) for a more complete example
of writing a document and then rendering it (offline, in that case).
See [TODO] for an even bigger, in-browser, dynamic example.
## Implementation
I'm using
[parsimmon parser combinators](https://github.com/jneen/parsimmon) in
the [JSX matcher](lib/jsx_parser.js) instead of the regexes in the
original
[HTML matcher](https://github.com/markdown-it/markdown-it/blob/9074242bdd6b25abf0b8bfe432f152e7b409b8e1/lib/common/html_re.js),
to scan over braced expressions for embedded JS. This is probably
excessive, and a for loop with a state variable would suffice. The
behavior is also not really correct (what about braces inside string
literals in JS?), but good enough for now.
The render rule in [index.js](index.js) just passes the JSX code string
straight through into the rendered output; the parser doesn't construct
a coherent AST of the JSX or anything.
There's a hack for JSX blocks (like
[HTML blocks](http://spec.commonmark.org/0.25/#html-blocks) in
standard Markdown); if we see a paragraph with JSX tags at its open
and end, we remove the paragraph open and end, effectively promoting
the JSX inside. Again, not really correct, and will treat some things
differently from CommonMark spec, but good enough.
## Changelog
- 1.1.0: Merged PRs from Xiphe: update dependencies, treat contents of
backtick code inlines/fenced blocks as literal JS strings (so braces
aren't annoying in code samples, for example).
- 1.0.0: Initial release.
## See also
Similar things and classes of things:
- Andrey Popp's [Reactdown](https://andreypopp.github.io/reactdown/)
was the first I saw, in its
[iteration from 2014](https://github.com/andreypopp/reactdown/tree/prev). The
old version was pretty similar but had a less reliable Markdown
parser, I think. The new version seems to abandon the JSX
syntax. Very much worth looking at, though.
- [mdreact](https://github.com/funkjunky/mdreact) also appears similar
but also abandons JSX syntax, and it looks a little unreliable.
- [react-showdown](https://github.com/jerolimov/react-showdown) can
only generate the React component as a runtime object, not as JSX
source; it's not a static compilation pipeline.
- [rexxars/react-markdown](https://github.com/rexxars/react-markdown) and some
others render ordinary Markdown to React components, but don't let
you embed React components in the Markdown (since that would make
the output a component instead of a static element tree)
- [sunflowerdeath/react-markdown](https://github.com/sunflowerdeath/react-markdown)
and some others provide a React component that renders children or
props as React components. Again, can't actually embed custom tags
in the Markdown.
- [markdown-component-loader](https://www.npmjs.com/package/markdown-component-loader)
(recent) looks pretty good at a glance. Slightly heavier
double-brace syntax. Also, a Webpack loader, so very build-system-y
instead of just being a markdown-it plugin?
Things I wanted from this syntax extension:
- Use arbitrary React components inside Markdown document. (This
plugin alone doesn't deal with scoping and defining names used in
your JSX, though. See [TODO] for one solution to that issue.)
- Use standard JSX syntax inside Markdown document.
- Statically compile Markdown+JSX source to JavaScript React component
source.
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