Add tests, remove unused code, fix bugs

- Added tests for more error messages
- Test the "go to reference" feature at every character index of every
test case
- Delete unused code and imports
- Fix some bugs I found along the way

blueprintcompiler/outputs/xml/__init__.py

@@ -366,12 +366,13 @@ class XmlOutput(OutputFormat):
 
         elif isinstance(extension, ExtScaleMarks):
             xml.start_tag("marks")
-            for mark in extension.children:
+            for mark in extension.marks:
+                label = mark.label.child if mark.label is not None else None
                 xml.start_tag(
                     "mark",
                     value=mark.value,
                     position=mark.position,
-                    **self._translated_string_attrs(mark.label and mark.label.child),
+                    **self._translated_string_attrs(label),
                 )
                 if mark.label is not None:
                     xml.put_text(mark.label.string)

blueprintcompiler/outputs/xml/xml_emitter.py

@@ -40,7 +40,9 @@ class XmlEmitter:
         self._tag_stack = []
         self._needs_newline = False
 
-    def start_tag(self, tag, **attrs: T.Union[str, GirType, ClassName, bool, None]):
+    def start_tag(
+        self, tag, **attrs: T.Union[str, GirType, ClassName, bool, None, float]
+    ):
         self._indent()
         self.result += f"<{tag}"
         for key, val in attrs.items():