From fbba44312fa053832a4c9b77547bffdc6a9d9b26 Mon Sep 17 00:00:00 2001
From: Charlotte Meyer <dev@buffet.sh>
Date: Wed, 26 Oct 2022 14:46:13 +0000
Subject: [PATCH] fix(lexer): fix inproper handling of `\\\n`

Before it would escape the newline resulting in passing it as an
argument.

Signed-off-by: Charlotte Meyer <dev@buffet.sh>
---
 crates/oyster_parser/src/lexer.rs                        | 8 ++++----
 crates/oyster_parser/tests/it/lexer.rs                   | 9 +++++++++
 .../tests/it/snapshots/it__lexer__escape_newline.snap    | 8 ++++++++
 3 files changed, 21 insertions(+), 4 deletions(-)
 create mode 100644 crates/oyster_parser/tests/it/snapshots/it__lexer__escape_newline.snap

diff --git a/crates/oyster_parser/src/lexer.rs b/crates/oyster_parser/src/lexer.rs
index f73993e..36f8154 100644
--- a/crates/oyster_parser/src/lexer.rs
+++ b/crates/oyster_parser/src/lexer.rs
@@ -125,10 +125,10 @@ impl Lexer<'_> {
                         TokenKind::Comment
                     }
 
-                    '\\' => {
-                        self.next_char();
-                        TokenKind::EscapedChar
-                    }
+                    '\\' => match self.next_char() {
+                        Some('\n') => TokenKind::Whitespace,
+                        _ => TokenKind::EscapedChar,
+                    },
 
                     _ => {
                         self.eat_while(|c| {
diff --git a/crates/oyster_parser/tests/it/lexer.rs b/crates/oyster_parser/tests/it/lexer.rs
index 6c43425..92a2368 100644
--- a/crates/oyster_parser/tests/it/lexer.rs
+++ b/crates/oyster_parser/tests/it/lexer.rs
@@ -144,3 +144,12 @@ fn closing_parenthesis_string_mode() {
 
     assert_snapshot!(actual);
 }
+
+#[test]
+fn escape_newline() {
+    let source = "\\\n";
+
+    let actual = Lexer::new(source).next_command_token();
+
+    assert_snapshot!(actual);
+}
diff --git a/crates/oyster_parser/tests/it/snapshots/it__lexer__escape_newline.snap b/crates/oyster_parser/tests/it/snapshots/it__lexer__escape_newline.snap
new file mode 100644
index 0000000..1fb4ba0
--- /dev/null
+++ b/crates/oyster_parser/tests/it/snapshots/it__lexer__escape_newline.snap
@@ -0,0 +1,8 @@
+---
+source: crates/oyster_parser/tests/it/lexer.rs
+expression: actual
+---
+Token {
+    kind: Whitespace,
+    len: 2,
+}