initial improvements to allow multiline annotations

- Improve tree search
- Improve annotation argument loop

crates/typst-syntax/src/lexer.rs

@@ -271,9 +271,9 @@ impl Lexer<'_> {
         // parenthesis) or newline. We have to check the newline before eating
         // (through '.peek()') to ensure it is not considered part of the
         // annotation.
-        let mut current_start = self.s.cursor();
         let mut found_closing_paren = false;
         while !self.s.at(is_newline) {
+            let current_start = self.s.cursor();
             let token = match self.s.eat() {
                 Some(c) if c.is_whitespace() => {
                     self.s.eat_while(is_inline_whitespace);
@@ -325,8 +325,6 @@ impl Lexer<'_> {
 
             let node = self.emit_token(token, current_start);
             subtree.push(node);
-
-            current_start = self.s.cursor();
         }
 
         // Right parenthesis (covered above)

crates/typst-syntax/src/node.rs

@@ -825,19 +825,23 @@ impl<'a> LinkedNode<'a> {
     pub fn prev_attached_annotation(&self) -> Option<Self> {
         let mut cursor = self.prev_sibling_inner()?;
         let mut newlines = cursor.capped_newlines();
-        while newlines < 2 {
+        while cursor.kind() != SyntaxKind::Annotation {
-            if cursor.kind() == SyntaxKind::Annotation {
+            if newlines >= 2 {
-                return Some(cursor);
+                // Annotations are attached if they're in the previous line.
+                // If we counted at least two newlines without finding an
+                // annotation, no annotations are attached to this node.
+                //
+                // Note that this check is only run if the latest node was not
+                // an annotation, otherwise annotations with multiple lines
+                // would always be rejected.
+                return None;
             }
 
             cursor = cursor.prev_sibling_inner()?;
             newlines += cursor.capped_newlines();
         }
 
-        // Annotations are attached if they're in the previous line.
+        Some(cursor)
-        // If we counted at least two newlines, no annotations are attached to
-        // this node.
-        None
     }
 
     /// Get the next non-trivia sibling node.