New method Expression.subs

[linpy.git] / pypol / domains.py

diff --git a/pypol/domains.py b/pypol/domains.py
index b4780fc..6060dc9 100644 (file)
--- a/pypol/domains.py
+++ b/pypol/domains.py
@@ -5,7 +5,7 @@ import re
 from . import islhelper
 
 from .islhelper import mainctx, libisl, isl_set_basic_sets
-from .linexprs import Expression, Symbol
+from .linexprs import Expression, Symbol, symbolnames
 
 
 __all__ = [
@@ -154,15 +154,7 @@ class Domain:
 
     def project_out(self, symbols):
         # use to remove certain variables
-        if isinstance(symbols, str):
-            symbols = symbols.replace(',', ' ').split()
-        else:
-            symbols = list(symbols)
-            for i, symbol in enumerate(symbols):
-                if isinstance(symbol, Symbol):
-                    symbols[i] = symbol.name
-                elif not isinstance(symbol, str):
-                    raise TypeError('symbols must be strings or Symbol instances')
+        symbols = symbolnames(symbols)
         islset = self._toislset(self.polyhedra, self.symbols)
         # the trick is to walk symbols in reverse order, to avoid index updates
         for index, symbol in reversed(list(enumerate(self.symbols))):
@@ -346,6 +338,7 @@ class Domain:
     def tosympy(self):
         raise NotImplementedError
 
+
 def And(*domains):
     if len(domains) == 0:
         from .polyhedra import Universe