Drop the recursion check

Author: ekaf

nltk/grammar.py

@@ -6,7 +6,6 @@
 #         Jason Narad <[email protected]>
 #         Peter Ljunglöf <[email protected]>
 #         Tom Aarsen <>
-#         Eric Kafe <[email protected]>
 # URL: <https://www.nltk.org/>
 # For license information, see LICENSE.TXT
 #
@@ -305,9 +304,6 @@ def rhs(self):
         """
         return self._rhs
 
-    def is_recursive(self):
-        return self.lhs() in self.rhs()
-
     def __len__(self):
         """
         Return the length of the right-hand side.
@@ -609,12 +605,6 @@ def productions(self, lhs=None, rhs=None, empty=False):
                 if prod in self._rhs_index.get(rhs, [])
             ]
 
-    def is_recursive(self):
-        for prod in self.productions():
-            if prod.is_recursive():
-                return True
-        return False
-
     def leftcorners(self, cat):
         """
         Return the set of all nonterminals that the given nonterminal

nltk/parse/generate.py

@@ -27,11 +27,8 @@ def generate(grammar, start=None, depth=None, n=None):
     if not start:
         start = grammar.start()
     if depth is None:
-        if grammar.is_recursive():
-            # This seems to be an almost maximal safe default with Python 3:
-            depth = (sys.getrecursionlimit() // 3) - 3
-        else:
-            depth = sys.maxsize
+        # Safe default, assuming the grammar may be recursive:
+        depth = (sys.getrecursionlimit() // 3) - 3
 
     iter = _generate_all(grammar, [start], depth)