ENH: process CIFs with curly-bracket values

Author: pavoljuhas

src/diffpy/structure/parsers/p_cif.py

@@ -309,7 +309,9 @@ def _parseCifDataSource(self, datasource):
         self.stru = None
         try:
             with _suppressCifParserOutput():
-                self.ciffile = CifFile(datasource)
+                # Use `grammar` option to digest values with curly-brackets.
+                # Ref: https://bitbucket.org/jamesrhester/pycifrw/issues/19
+                self.ciffile = CifFile(datasource, grammar='auto')
                 for blockname in self.ciffile.keys():
                     self._parseCifBlock(blockname)
                     # stop after reading the first structure

src/diffpy/structure/tests/testp_cif.py

@@ -344,7 +344,6 @@ def test_adp_aniso_label(self):
         return
 
 
-    @unittest.expectedFailure
     def test_curly_brace(self):
         "verify loading of a CIF file with unquoted curly brace"
         ptest = self.ptest