[codegen] use None for whitespace when not specified

neogeny · May 2, 2024 · 4e0d5f1 · 4e0d5f1
1 parent afecc15
commit 4e0d5f1
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diff --git a/tatsu/infos.py b/tatsu/infos.py
@@ -15,7 +15,7 @@ class UndefinedStr(str):
     pass
 
 
-_undefined_str = UndefinedStr()
+_undefined_str = UndefinedStr('>>undefined<<')
 
 
 @dataclasses.dataclass

diff --git a/tatsu/ngcodegen/python.py b/tatsu/ngcodegen/python.py
@@ -8,6 +8,7 @@
 from .. import grammars
 from ..collections import OrderedSet as oset
 from ..exceptions import CodegenError
+from ..infos import UndefinedStr
 from ..mixins.indent import IndentPrintMixin
 from ..util import compress_seq, safe_name
 from ..walkers import NodeWalker
@@ -308,6 +309,8 @@ def _gen_init(self, grammar: grammars.Grammar):
         start = grammar.config.start or grammar.rules[0].name
 
         whitespace = grammar.config.whitespace
+        if isinstance(whitespace, UndefinedStr):  # the default value
+            whitespace = None
         whitespace = repr(whitespace)
 
         self.print(