fix(lexer): 🩹 handle escaped quotes in single-quoted strings

tests/test_everything.yaml

@@ -129,3 +129,7 @@ complex_anchor_chains:
   final:
     <<: *derived2 # Final merge
     final: value3
+
+# Complex string
+config:
+  where: '{{ "my_column != date ''2025-08-31''" if target.name == ''prod'' else ''1=1'' }}'

yamlium/lexer.py

@@ -393,7 +393,18 @@ def _parse_quoted_scalar(self) -> list[Token]:
         quote_char = self.c
         self._nc()
         char = self.c
-        while char != quote_char:
+        while True:
+            if char == quote_char:
+                # Check if this is an escaped quote (two consecutive quotes)
+                if quote_char == "'" and self.c_future == "'":
+                    # Skip both quotes - this is an escaped single quote
+                    self._nc()  # Skip first quote
+                    self._nc()  # Skip second quote
+                    char = self.c
+                    continue
+                else:
+                    # Found the closing quote
+                    break
             if char == "\n":
                 # In YAML, quoted strings can span multiple lines
                 # Track the newline for proper line/column tracking