Re: [Pyparsing] keepOriginalText problem

[Paul M. <pt...@au...>]

Stefaan -

I suspect the problem is with the inspect module usage, don't know how to
work around that per se.

However, I did come up with something interesting.  I defined an Empty()
with a parse action that just returns the current parse location.  I then
bracketed your remove_lines expression with one of these at the beginning
and at the end, with appropriate results names.  Then instead of attaching
keepOriginalText, I attached a simple lambda that returns the slice of the
input string from the given begin and end values.  See below:

# a dummy expression that just returns the current parse location
get_cur_locn = p.Empty().setParseAction(lambda s,l,t: l)

remove_line = p.lineStart + p.Literal("<").suppress() + \
    p.restOfLine.setResultsName("LineContents") + p.lineEnd

# put get_cur_locn exprs at front and back of remove_lines, with
# useful results names - (Combine is not really necessary, I don't think)
remove_lines = get_cur_locn("begin") + \
    p.OneOrMore(remove_line) + \
    get_cur_locn("end")

# now replace keepOriginalText with simple string slice - should be
# faster, too!
remove_lines.setParseAction(lambda s,l,t:s[t.begin:t.end])


HTH,
-- Paul



-----Original Message-----
From: pyp...@li...
[mailto:pyp...@li...] On Behalf Of stefaan
Sent: Thursday, July 03, 2008 6:20 AM
To: pyp...@li...
Subject: [Pyparsing] keepOriginalText problem

Hello,

I have a problem with keepOriginalText: when I try to parse a grammar using
the
keepOriginalText parse action inside a cherrypy 2.2.1-based web application,
the
getTokensEndLoc() fails and I get a traceback:

File "C:\shi\webapp\comparefiles\comparefiles.py", line 273, in doCompare
    NormalDiffParser.remove_lines.parseString("< line 1" + os.linesep + "<
line
2" + os.linesep)
  File "C:\shi\webapp\comparefiles\diffparser\pyparsing.py", line 981, in
parseString
    loc, tokens = self._parse( instring, 0 )
  File "C:\shi\webapp\comparefiles\diffparser\pyparsing.py", line 886, in
_parseNoCache
    tokens = fn( instring, tokensStart, retTokens )
  File "C:\shi\webapp\comparefiles\diffparser\pyparsing.py", line 3156, in
keepOriginalText
    endloc = getTokensEndLoc()
  File "C:\shi\webapp\comparefiles\diffparser\pyparsing.py", line 3167, in
getTokensEndLoc
    fstack = inspect.stack()
  File "D:\Python24\lib\inspect.py", line 819, in stack
    return getouterframes(sys._getframe(1), context)
  File "D:\Python24\lib\inspect.py", line 800, in getouterframes
    framelist.append((frame,) + getframeinfo(frame, context))
  File "D:\Python24\lib\inspect.py", line 769, in getframeinfo
    raise TypeError('arg is not a frame or traceback object')
TypeError: arg is not a frame or traceback object

The grammar for remove_lines:

import pyparsing as 
remove_line = p.lineStart + p.Literal("<").suppress() + \
p.restOfLine.setResultsName("LineContents") + p.lineEnd
remove_lines = p.Combine(p.OneOrMore(remove_line))
remove_lines.setParseAction(p.keepOriginalText)


The same program, with the same input, works flawlessly in a "normal" (i.e.
not
webapplication) script.



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