From fe618ff6e38ec0ed4da72a3935fd9ea64ee1cef5 Mon Sep 17 00:00:00 2001
From: Titus Wormer <tituswormer@gmail.com>
Date: Mon, 19 Sep 2022 11:17:26 +0200
Subject: Add support for parsing MDX ESM, expressions

This commit adds support for hooks that lets a user integrate another
parser with `micromark-rs`, to parse ESM and expressions according to
a particular grammar (such as a programming language, typically
JavaScript).

For an example integrating with SWC, see `tests/test_utils/mod.rs`.

The integration occurs with two functions passed in `options`:
`mdx_expression_parse` and `mdx_esm_parse`.
The can signal back to micromark when they are successful,
whether there is an error at the end (in which case micromark will
try to parse more), or whether there is a syntax error (in which case
micromark will crash).
---
 tests/mdx_swc.rs | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 tests/mdx_swc.rs

(limited to 'tests/mdx_swc.rs')

diff --git a/tests/mdx_swc.rs b/tests/mdx_swc.rs
new file mode 100644
index 0000000..c9a2a61
--- /dev/null
+++ b/tests/mdx_swc.rs
@@ -0,0 +1,47 @@
+extern crate micromark;
+mod test_utils;
+use micromark::{micromark_with_options, Constructs, Options};
+use pretty_assertions::assert_eq;
+use test_utils::{parse_esm, parse_expression};
+
+#[test]
+fn mdx_swc() -> Result<(), String> {
+    let mdx = Options {
+        constructs: Constructs::mdx(),
+        mdx_esm_parse: Some(Box::new(parse_esm)),
+        mdx_expression_parse: Some(Box::new(parse_expression)),
+        ..Options::default()
+    };
+
+    assert_eq!(
+        micromark_with_options("{'}'}", &mdx)?,
+        "",
+        "should support JavaScript-aware flow expressions w/ `mdx_expression_parse`"
+    );
+
+    assert_eq!(
+        micromark_with_options("a {'}'} b", &mdx)?,
+        "<p>a  b</p>",
+        "should support JavaScript-aware text expressions w/ `mdx_expression_parse`"
+    );
+
+    assert_eq!(
+        micromark_with_options("<a {...a/*}*/} />", &mdx)?,
+        "",
+        "should support JavaScript-aware attribute expressions w/ `mdx_expression_parse`"
+    );
+
+    assert_eq!(
+        micromark_with_options("<a b={'}'} />", &mdx)?,
+        "",
+        "should support JavaScript-aware attribute value expressions w/ `mdx_expression_parse`"
+    );
+
+    assert_eq!(
+        micromark_with_options("import a from 'b'\n\nexport {a}\n\n# c", &mdx)?,
+        "<h1>c</h1>",
+        "should support JavaScript-aware ESM w/ `mdx_esm_parse`"
+    );
+
+    Ok(())
+}
-- 
cgit