From d23677456e8e61de913a81644faf671de8c406dc Mon Sep 17 00:00:00 2001
From: Sergei Zharinov <zharinov@users.noreply.github.com>
Date: Sat, 27 Dec 2025 09:57:52 -0300
Subject: [PATCH] feat: Add semicolon as line comment delimiter

Support `;` as an alternative line comment syntax alongside
the existing `//` and `/* */` C-style comments.
---
 crates/plotnik-lib/src/parser/cst.rs          |  1 +
 .../src/parser/tests/grammar/trivia_tests.rs  | 26 +++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/crates/plotnik-lib/src/parser/cst.rs b/crates/plotnik-lib/src/parser/cst.rs
index 0f5f6c80..e6cb307b 100644
--- a/crates/plotnik-lib/src/parser/cst.rs
+++ b/crates/plotnik-lib/src/parser/cst.rs
@@ -119,6 +119,7 @@ pub enum SyntaxKind {
     Newline,
 
     #[regex(r"//[^\n]*", allow_greedy = true)]
+    #[regex(r";[^\n]*", allow_greedy = true)]
     LineComment,
 
     #[regex(r"/\*(?:[^*]|\*[^/])*\*/")]
diff --git a/crates/plotnik-lib/src/parser/tests/grammar/trivia_tests.rs b/crates/plotnik-lib/src/parser/tests/grammar/trivia_tests.rs
index b3a773f0..18b6a8ea 100644
--- a/crates/plotnik-lib/src/parser/tests/grammar/trivia_tests.rs
+++ b/crates/plotnik-lib/src/parser/tests/grammar/trivia_tests.rs
@@ -182,3 +182,29 @@ fn comment_only_raw() {
       Newline "\n"
     "#);
 }
+
+#[test]
+fn semicolon_comment() {
+    let input = indoc! {r#"
+    ; semicolon comment
+    Q = (identifier)
+    "#};
+
+    let res = Query::expect_valid_cst_full(input);
+
+    insta::assert_snapshot!(res, @r#"
+    Root
+      LineComment "; semicolon comment"
+      Newline "\n"
+      Def
+        Id "Q"
+        Whitespace " "
+        Equals "="
+        Whitespace " "
+        Tree
+          ParenOpen "("
+          Id "identifier"
+          ParenClose ")"
+      Newline "\n"
+    "#);
+}