From 4e3f1677be4f1d798ff33698d5875f67b83b50b1 Mon Sep 17 00:00:00 2001
From: Jesse Brault <jbrault@mac.com>
Date: Fri, 21 Aug 2026 13:50:44 -0500
Subject: [PATCH] Fixed some lexer/parser bugs related to lexer errors.

---
 dmc-lib/src/lexer.rs  | 15 ++++++++-------
 dmc-lib/src/parser.rs | 15 ++++++++++++++-
 2 files changed, 22 insertions(+), 8 deletions(-)

diff --git a/dmc-lib/src/lexer.rs b/dmc-lib/src/lexer.rs
index 5319373..1627b39 100644
--- a/dmc-lib/src/lexer.rs
+++ b/dmc-lib/src/lexer.rs
@@ -118,11 +118,10 @@ impl<'a> Lexer<'a> {
                         }
                     }
                     if !terminated {
-                        return Some(Err(LexerError::new(
-                            self.position,
-                            end,
-                            LexerErrorKind::UnterminatedString,
-                        )));
+                        let err =
+                            LexerError::new(self.position, end, LexerErrorKind::UnterminatedString);
+                        self.position = end;
+                        return Some(Err(err));
                     }
                     (end, TokenKind::String)
                 } else {
@@ -137,11 +136,13 @@ impl<'a> Lexer<'a> {
                     }
 
                     if prefix.len() == 0 {
-                        return Some(Err(LexerError::new(
+                        let err = LexerError::new(
                             self.position,
                             self.position + 1,
                             LexerErrorKind::UnrecognizedCharacter(chunk.chars().next().unwrap()),
-                        )));
+                        );
+                        self.position += 1;
+                        return Some(Err(err));
                     }
 
                     let token_kind = match prefix.as_str() {
diff --git a/dmc-lib/src/parser.rs b/dmc-lib/src/parser.rs
index a1aab43..7712832 100644
--- a/dmc-lib/src/parser.rs
+++ b/dmc-lib/src/parser.rs
@@ -1166,7 +1166,20 @@ impl<'a> Parser<'a> {
     }
 
     fn expression(&mut self) -> MaybeParseResult<Expression> {
-        self.bitwise_or_expression()
+        if self.current.is_some() {
+            if matches_expression_first!(self.current.as_ref().unwrap().kind()) {
+                self.bitwise_or_expression()
+            } else {
+                let diagnostic = Self::get_expected_but_found(
+                    &EXPRESSION_FIRSTS,
+                    self.current.as_ref().unwrap(),
+                );
+                MaybeParseResult::none(vec![diagnostic])
+            }
+        } else {
+            let diagnostic = Self::get_expected_but_found_eoi(&EXPRESSION_FIRSTS, 0);
+            MaybeParseResult::none(vec![diagnostic])
+        }
     }
 
     fn bitwise_or_expression(&mut self) -> MaybeParseResult<Expression> {