source: make SourceLocation comparable

compiler/source.py

@@ -70,6 +70,23 @@ class SourceLocation:
             return str(self.begin)
         return f"{str(self.begin)} - {str(self.end)}"
 
+    @typecheck
+    def __lt__(self, other: SourceLocation) -> bool:
+        return self.end < other.begin
+
+    @typecheck
+    def __ge__(self, other: SourceLocation) -> bool:
+        return not self.__lt__(other)
+
+    def __eq__(self, other) -> bool:
+        if not isinstance(other, self.__class__):
+            return False
+
+        return all((
+            self.begin == self.begin,
+            self.end == self.end
+        ))
+
     @property
     def source_substring(self) -> str:
         source = self.source.splitlines(keepends=False)