speed improvement

cache the merged set of all name part constants

Author: derek73

nameparser/config/__init__.py

@@ -152,10 +152,13 @@ def __init__(self,
         self.conjunctions      = SetManager(conjunctions)
         self.capitalization_exceptions = TupleManager(capitalization_exceptions)
         self.regexes                = TupleManager(regexes)
+        self._pst = None
 
     @property
     def suffixes_prefixes_titles(self):
-        return self.prefixes | self.suffixes | self.titles
+        if not self._pst:
+            self._pst = self.prefixes | self.suffixes | self.titles
+        return self._pst
 
     def __repr__(self):
         return "<Constants() instance>"

nameparser/parser.py

@@ -550,8 +550,9 @@ def join_on_conjunctions(self, pieces, additional_parts_count=0):
             # loop through the pieces backwards, starting at the end of the list.
             # Join conjunctions to the pieces on either side of them.
 
-            if len(conj) == 1 and \
-                len(list(filter(self.is_rootname, pieces))) + additional_parts_count < 4:
+            rootname_pieces = [p for p in pieces if self.is_rootname(p)]
+            total_length= len(rootname_pieces) + additional_parts_count
+            if len(conj) == 1 and total_length < 4:
                 # if there are only 3 total parts (minus known titles, suffixes and prefixes) 
                 # and this conjunction is a single letter, prefer treating it as an initial
                 # rather than a conjunction.