better quote support

src/rougail/tiramisureflector.py

@@ -1,6 +1,8 @@
 """loader
 flattened XML specific
 """
+from json import dumps
+
 from .config import Config
 from .annotator import CONVERT_OPTION
 from .objspace import RootRougailObject
@@ -173,14 +175,14 @@ class Common:
     def convert_str(value):
         """convert string
         """
-        return "'" + value.replace("'", "\\\'") + "'"
+        return dumps(value, ensure_ascii=False)
 
     def properties_to_string(self,
                              values: list,
                              ) -> None:
         """Change properties to string
         """
-        properties = [f"'{property_}'" for property_ in values if isinstance(property_, str)]
+        properties = [self.convert_str(property_) for property_ in values if isinstance(property_, str)]
         calc_properties = [self.calc_properties(property_) for property_ in values \
                 if isinstance(property_, self.objectspace.property_)]
         return 'frozenset({' + ', '.join(sorted(properties) + calc_properties) + '})'
@@ -238,6 +240,7 @@ class Variable(Common):
             if hasattr(self.elt, key) and getattr(self.elt, key) is not None:
                 value = getattr(self.elt, key)
                 if isinstance(value, str):
+                    print('pouet')
                     value = self.convert_str(value)
                 elif isinstance(value, self.objectspace.value):
                     value = self.calculation_value(value, [])