Luke -
I tripped over this same bug doing HTML tag stripping. The latest pyparsing
in SVN has a version of _flatten that uses a lot less recursion. Also, a
slightly improved version of transformString, which is smart enough to leave
out empty strings from the list of strings to be joined.
The new _flatten only recurses if there is a nesting of parsed structures:
def _flatten(L):
ret = []
for i in L:
if isinstance(i,list):
ret.extend(_flatten(i))
else:
ret.append(i)
return ret
-- Paul
-----Original Message-----
From: Luke Campagnola [mailto:lca...@em...]
Sent: Monday, May 30, 2011 10:28 AM
To: pyp...@li...
Subject: [Pyparsing] recursion in _flatten after version 1.5.2
Howdy,
I have a script that I use to strip comments from C files. The code fails
for any pyparsing version later than 1.5.2.
Backtrace looks like this:
File "CParser.py", line 300, in removeComments
self.files[file] = (quotedString | cStyleComment.suppress() |
cplusplusLineComment.suppress()).transformString(text)
File "c:\python27\lib\site-packages\pyparsing.py", line 1166, in
transformString
return "".join(map(_ustr,_flatten(out)))
File "c:\python27\lib\site-packages\pyparsing.py", line 3190, in
_flatten
return _flatten(L[0]) + _flatten(L[1:])
File "c:\python27\lib\site-packages\pyparsing.py", line 3190, in
_flatten
return _flatten(L[0]) + _flatten(L[1:])
. . .
File "c:\python27\lib\site-packages\pyparsing.py", line 3188, in
_flatten
if type(L) is not list: return [L]
RuntimeError: maximum recursion depth exceeded while calling a Python
object
If I remember correctly, 'quotedString' and cStyleComment' are provided by
pyparsing, and I have provided this definition:
cplusplusLineComment = Literal("//") + restOfLine
Any hints?
Luke
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