Re: [Pyparsing] empty lines and restOfLine comments

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

To use restOfLine, you need to join using "\n", not "".  The \n characters tell restOfLine when to stop.

I'll try to pull together a Dict example with your input data.

-- Paul


----- Original Message -----
From: Robert Pollak <rob...@gm...>
Date: Thursday, March 31, 2005 5:22 pm
Subject: [Pyparsing] empty lines and restOfLine comments

> Hello!
> I am a(nother) Python and pyparsing newbie.
> I want to use pyparsing-1.3 to parse files that look like the
> following snippet, enclosed in triple quotes:
> """
> / Flux DSS-DESIGNER, Sample Data
> 
> / Projekt: Set 1
> 
> 
> 
> // HYDRAULIK & QUERPROFIL-DATEN
> 
> floin_file          = set_1.floin
> 
> floab_file          = set_1.floab
> 
> 
> floout_file         = floout
> 
> flores_file         = flores
> 
> 
> // REGELUNG
> 
> ctrlin_file         = set_1.ctrlin
> 
> ctrlres_file        = ctrl_res
> 
> """
> 
> Lines starting with a slash (comments) should be ignored.
> I have been reading (either on this list or in the sf help forum - I
> cannot find it right now) that empty lines can only be read using
> grammar.parseString("".join(inputFile.readlines())), like in the
> configParse.py example.
> But when everything is joined like this, how can the end of the
> comment lines be determined?
> 
> I am currently stuck at:
> chars = alphanums + "_" + "." + "\\"
> assignment = Word(chars) + "=" + Word(chars)
> line = (assignment | restOfLine) + LineEnd
> grammar = ZeroOrMore(line)
> 
> This does not even run through - I get
> Traceback (most recent call last):
>  File "parseCfg.py", line 6, in ?
>    line = (assignment | restOfLine) + LineEnd
>  File "/usr/lib/python2.3/site-packages/pyparsing.py", line 635, 
> in __add__
>    return And( [ self, other ] )
>  File "/usr/lib/python2.3/site-packages/pyparsing.py", line 1306, 
> in __init__
>    if not e.mayReturnEmpty:
> AttributeError: type object 'LineEnd' has no attribute 
> 'mayReturnEmpty'
> When I just use "line = assignment | restOfLine" instead, the parser
> runs into an infinite loop on the snippet above, with or without the
> "join readlines" trick.
> 
> Thank you for any help,
> 
> Robert
> 
> Btw, how can I use a pyparsing.Dict here to get direct access e.g. to
> myParseResult['floin_file']?
> 
> 
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