From bc5c51c82fa5109d44094fb034cc50cc44f1016e Mon Sep 17 00:00:00 2001
From: itchyny <itchyny@cybozu.co.jp>
Date: Sun, 25 Feb 2024 21:35:09 +0900
Subject: [PATCH] Support multi-line comment with backslash

---
 crates/lang/src/lexer.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/crates/lang/src/lexer.rs b/crates/lang/src/lexer.rs
index d06cb53..cfed42e 100644
--- a/crates/lang/src/lexer.rs
+++ b/crates/lang/src/lexer.rs
@@ -416,7 +416,7 @@ lexer! {
     type Error = LexicalError;
 
     let ws = [' ' '\t' '\n'] | "\r\n";
-    let comment = '#' (_ # ['\r' '\n'])*;
+    let comment = '#' (_ # ['\\' '\r' '\n'] | '\\' (_ # '\r' | "\r\n"))*;
     let ident_start = ['a'-'z' 'A'-'Z' '_'];
     let digit = ['0'-'9'];
     let hex_digit = $digit | ['a'-'f' 'A'-'F'];
@@ -671,7 +671,8 @@ mod test {
         assert_lex(
             r#""\(
             1# This
-            + # is
+            + # is \
+            test
             2  #
             )"  # comment"#,
             &[