Re: [Pyparsing] text grammar -- first rough

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

Ralph -

Actually, spir/Denis is proposing a specialized form of BNF, which would be
compilable into pyparsing constructs (I think that's where we left this idea
last), probably using a pyparsing parser.

I do agree, though, that writing up an actual example would be very
instructive, both in conveying the concepts, and in actually testing the
syntax out.  How about this for a test structure, a log message:

An integer message number
Date/time timestamp
Severity (Debug/Info/Warning/Error)
Message everything up to the end of line

Example:
10001 2008/11/18 12:34:56 Error A bad thing happened

Use the syntax to name each field, each field in the date-timestamp, and
convert the integers to actual integers and the date-timestamp into a
datetime.datetime (that is a datetime object as imported from the Python
datetime module).

You can also look back on the examples I've posted over the past few years
on comp.lang.python and use one of them.

-- Paul


-----Original Message-----
From: Ralph Corderoy [mailto:ra...@in...] 
Sent: Tuesday, November 18, 2008 2:40 PM
To: spir
Cc: [pyParsing]
Subject: Re: [Pyparsing] text grammar -- first rough


Hi spir,

I don't wish to discourage your using the list as a sounding board, but I
for one would have more inclination to read in detail if there was an
example at the top that contrasts how I'd have to write something now in
PyParsing compared to the better way I could write it with your suggestions.

Cheers,


Ralph.


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