diff options
Diffstat (limited to 'pyparsing.py')
| -rw-r--r-- | pyparsing.py | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/pyparsing.py b/pyparsing.py index 4cb96df..b94040a 100644 --- a/pyparsing.py +++ b/pyparsing.py @@ -96,7 +96,7 @@ classes inherit from. Use the docstrings for examples of how to: """ __version__ = "2.4.1" -__versionTime__ = "29 Jun 2019 05:25 UTC" +__versionTime__ = "29 Jun 2019 06:17 UTC" __author__ = "Paul McGuire <ptmcg@users.sourceforge.net>" import string @@ -1418,6 +1418,9 @@ class ParserElement(object): value from fn, and the modified list of tokens will replace the original. Otherwise, fn does not need to return any value. + If None is passed as the parse action, all previously added parse actions for this + expression are cleared. + Optional keyword arguments: - callDuringTry = (default= ``False`` ) indicate if parse action should be run during lookaheads and alternate testing @@ -1441,8 +1444,13 @@ class ParserElement(object): # note that integer fields are now ints, not strings date_str.parseString("1999/12/31") # -> [1999, '/', 12, '/', 31] """ - self.parseAction = list(map(_trim_arity, list(fns))) - self.callDuringTry = kwargs.get("callDuringTry", False) + if list(fns) == [None, ]: + self.parseAction = None + else: + if not all(callable(fn) for fn in fns): + raise TypeError("parse actions must be callable") + self.parseAction = list(map(_trim_arity, list(fns))) + self.callDuringTry = kwargs.get("callDuringTry", False) return self def addParseAction( self, *fns, **kwargs ): |