Evaluate tuples. Fix parser.

pymbolic/mapper/evaluator.py

@@ -94,6 +94,9 @@ class EvaluationMapper(RecursiveMapper):
     def map_max(self, expr):
         return min(self.rec(child) for child in expr.children)
 
+    def map_tuple(self, expr):
+        return tuple(self.rec(child) for child in expr)
+
 
 
 

pymbolic/parser.py

@@ -37,7 +37,7 @@ _LEX_TABLE = [
     (_identifier, pytools.lex.RE(r"[a-z_A-Z_][a-zA-Z_0-9]*")),
     (_whitespace, pytools.lex.RE("[ \n\t]*")),
     (_comma, pytools.lex.RE(",")),
-    (_dot, pytools.lex.RE(".")),
+    (_dot, pytools.lex.RE(r"\.")),
     ]
 
 _PREC_COMMA = 5
@@ -107,6 +107,7 @@ def parse(expr_str):
                 pstate.advance()
                 did_something = True
             elif next_tag is _dot and _PREC_CALL > min_precedence:
+                1/0
                 pstate.advance()
                 pstate.expect(_identifier)
                 left_exp = primitives.Lookup(left_exp, pstate.next_str())