Re: [Pyparsing] Proposed notational shortcut for setResultsName

[Paul M. <pa...@al...>]

I don't want this to be part of the constructor. The point of setResultsName
is to take a generic pattern (something like integer), and use it in several
different places in the grammar, and the tokens returned from each place
have a different name.  So a better example than my personal info example
might be a parser for a statistical summary report:

realNum = Combine(Optional("-") + Word(nums)+ "." + Word(nums))
stats = "AVE =" + realNum["average"] + "STD. DEV. =" + realNum["stdDevn"] +
\
		"MIN =" + realNum["min"] + "MAX =" + realNum["max"] 

Please don't focus on the fact that [] is implemented using __getitem__, or
that [] implies that we are "getting" anything - does this notation seem
like a reasonable shortcut, in place of the following?

stats = "AVE =" + realNum.setResultsName("average") + "STD. DEV. =" +
realNum.setResultsName("stdDevn") + \
		"MIN =" + realNum.setResultsName("min") + "MAX =" +
realNum.setResultsName("max") 

Or, if you really want to think of this as a "getting" kind of operation,
you could interpret this notation as indicating that realNum["average"] is
getting for us a special form of realNum that names its returned tokens
"average".  For that matter, it also mirrors the dict-style format for
retrieval of the data:

results = stats.parseString( inputData )
print results["average"]

-- Paul


-----Original Message-----
From: pyp...@li...
[mailto:pyp...@li...] On Behalf Of Corrin
Lakeland
Sent: Thursday, May 24, 2007 6:45 PM
To: pyp...@li...
Subject: Re: [Pyparsing] Proposed notational shortcut for setResultsName

A tiny modification of Ralph's suggestion makes the most sense to me
 
    userdata = Word(alphas, res = "name") + Word(nums+"-", res =
"socsecno")


-----Original Message-----
From: pyp...@li...
[mailto:pyp...@li...] On Behalf Of Ralph
Corderoy
Sent: Friday, May 25, 2007 11:39 AM
To: Paul McGuire
Cc: pyp...@li...
Subject: Re: [Pyparsing] Proposed notational shortcut for setResultsName


Hi Paul,

> So how about adding a shortcut for setResultsName, using getitem? With

> this short cut, this code:
> 
>     userdata = Word(alphas).setResultsName("name") +
> Word(nums+"-").setResultsName("socsecno")
> 
> could be written as:
> 
>     userdata = Word(alphas)["name"] + Word(nums+"-")["socsecno"]

It just seems odd to use getitem to "set" something, i.e. the results name.
What about having "_" as an attribute function instead so it isn't too
obtrusive?

    userdata = Word(alphas)._("name") + Word(nums+"-")._("socsecno")

Or

    userdata = Word(alphas, n = "name") + Word(nums+"-", n = "socsecno")

Cheers,


Ralph.


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