From 4711b1f0720eb54e458ca5a16cb655013693b628 Mon Sep 17 00:00:00 2001
From: Titus Wormer <tituswormer@gmail.com>
Date: Fri, 9 Sep 2022 15:42:07 +0200
Subject: Add support for mdx attribute (value) expressions

---
 src/construct/partial_mdx_jsx.rs | 50 ++++++++++++++++++++++++++++++++++++++--
 1 file changed, 48 insertions(+), 2 deletions(-)

(limited to 'src/construct/partial_mdx_jsx.rs')

diff --git a/src/construct/partial_mdx_jsx.rs b/src/construct/partial_mdx_jsx.rs
index 05a2c0c..9177b5b 100644
--- a/src/construct/partial_mdx_jsx.rs
+++ b/src/construct/partial_mdx_jsx.rs
@@ -610,7 +610,17 @@ pub fn attribute_before(tokenizer: &mut Tokenizer) -> State {
         // End of tag.
         Some(b'>') => State::Retry(StateName::MdxJsxTagEnd),
         // Attribute expression.
-        Some(b'{') => unreachable!("to do: attribute expression"),
+        Some(b'{') => {
+            // To do: force `spread: true` if gnostic.
+            // To do: pass `start_point` if gnostic.
+            tokenizer.tokenize_state.token_2 = tokenizer.tokenize_state.token_1.clone();
+            tokenizer.tokenize_state.token_1 = Name::MdxJsxTagAttributeExpression;
+            tokenizer.attempt(
+                State::Next(StateName::MdxJsxAttributeExpressionAfter),
+                State::Nok,
+            );
+            State::Retry(StateName::MdxExpressionStart)
+        }
         _ => {
             // Start of an attribute name.
             if id_start(char_after_index(
@@ -633,6 +643,19 @@ pub fn attribute_before(tokenizer: &mut Tokenizer) -> State {
     }
 }
 
+/// After attribute expression.
+///
+/// ```markdown
+/// > | a <b {c} d/> e
+///             ^
+/// ```
+pub fn attribute_expression_after(tokenizer: &mut Tokenizer) -> State {
+    tokenizer.tokenize_state.token_1 = tokenizer.tokenize_state.token_2.clone();
+    tokenizer.tokenize_state.token_2 = Name::Data;
+    tokenizer.attempt(State::Next(StateName::MdxJsxAttributeBefore), State::Nok);
+    State::Retry(StateName::MdxJsxEsWhitespaceStart)
+}
+
 /// In primary attribute name.
 ///
 /// ```markdown
@@ -862,7 +885,16 @@ pub fn attribute_value_before(tokenizer: &mut Tokenizer) -> State {
             State::Next(StateName::MdxJsxAttributeValueQuotedStart)
         }
         // Attribute value expression.
-        Some(b'{') => unreachable!("to do: attribute value expression"),
+        Some(b'{') => {
+            // To do: pass `start_point` if gnostic.
+            tokenizer.tokenize_state.token_2 = tokenizer.tokenize_state.token_1.clone();
+            tokenizer.tokenize_state.token_1 = Name::MdxJsxTagAttributeValueExpression;
+            tokenizer.attempt(
+                State::Next(StateName::MdxJsxAttributeValueExpressionAfter),
+                State::Nok,
+            );
+            State::Retry(StateName::MdxExpressionStart)
+        }
         _ => crash(
             tokenizer,
             "before attribute value",
@@ -878,6 +910,20 @@ pub fn attribute_value_before(tokenizer: &mut Tokenizer) -> State {
     }
 }
 
+/// After attribute value expression.
+///
+/// ```markdown
+/// > | a <b c={d} e/> f
+///               ^
+/// ```
+pub fn attribute_value_expression_after(tokenizer: &mut Tokenizer) -> State {
+    tokenizer.tokenize_state.token_1 = tokenizer.tokenize_state.token_2.clone();
+    tokenizer.tokenize_state.token_2 = Name::Data;
+    tokenizer.exit(Name::MdxJsxTagAttribute);
+    tokenizer.attempt(State::Next(StateName::MdxJsxAttributeBefore), State::Nok);
+    State::Retry(StateName::MdxJsxEsWhitespaceStart)
+}
+
 /// Before quoted literal attribute value.
 ///
 /// ```markdown
-- 
cgit