fix issue #194 object attributes always sorted0.15.77

Test for this issue in:

https://bitbucket.org/ruamel/yaml.data/src/default/object/control_base_representer_mapping_sort.yaml

*When this change indeed resolves your problem, please **Close** this issue*.
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1 files changed, 22 insertions, 1 deletions

diff --git a/scalarstring.py b/scalarstring.py
index 03db72d..c7b1a78 100644
--- a/scalarstring.py
+++ b/scalarstring.py
@@ -3,6 +3,7 @@
 from __future__ import print_function, absolute_import, division, unicode_literals
 
 from ruamel.yaml.compat import text_type
+from ruamel.yaml.anchor import Anchor
 
 if False:  # MYPY
     from typing import Text, Any, Dict, List  # NOQA
@@ -20,7 +21,7 @@ __all__ = [
 
 
 class ScalarString(text_type):
-    __slots__ = ()
+    __slots__ = (Anchor.attrib)
 
     def __new__(cls, *args, **kw):
         # type: (Any, Any) -> Any
@@ -30,6 +31,26 @@ class ScalarString(text_type):
         # type: (Any, Any, int) -> Any
         return type(self)((text_type.replace(self, old, new, maxreplace)))
 
+    @property
+    def anchor(self):
+        # type: () -> Any
+        if not hasattr(self, Anchor.attrib):
+            setattr(self, Anchor.attrib, Anchor())
+        return getattr(self, Anchor.attrib)
+
+    def yaml_anchor(self):
+        # type: () -> Any
+        if not hasattr(self, Anchor.attrib):
+            return None
+        if not self.anchor.always_dump:
+            return None
+        return self.anchor
+
+    def yaml_set_anchor(self, value, always_dump=False):
+        # type: (Any, bool) -> None
+        self.anchor.value = value
+        self.anchor.always_dump = always_dump
+
 
 class LiteralScalarString(ScalarString):
     __slots__ = 'comment'  # the comment after the | on the first line