Message: 2
Date: Sun, 27 Nov 2005 11:15:51 +0100
From: Raphael Collet <[EMAIL PROTECTED]>
Subject: Re: Oz Newbie: CRLF conversion of redirected stdin
To: [EMAIL PROTECTED]
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Raph,
> > Anthony Borla wrote:
> > I'm using the following approach to read in a redirected
> > text file from stdin:
> >
> > ...{New TextFile init(name:stdin)}...
> >
> > ...
> > fun {LoadData FILE DATATBL}
> > case {FILE getS($)} of false then
> > DATATBL
> > elseof DATUM then
> > {LoadData FILE {Append DATATBL
> > [{String.toFloat DATUM}]}}
> > end
> > end
> > ...
>
> Just a side note: your function builds a list of size n in O(n^2)
> complexity! The following does the same in O(n):
>
Thanks for pointing that out. Admittedly I wasn't comfortable using 'Append'
here, but at this stage, I'm just 'doodling', trying to get a feel for the
various Oz facilities.
Besides, I *was* careful to ensure that a tail recursive call was made, so
at least the optimiser kicks in [AFAIK], and ensures the stack doesn't grow
[small consolation, though, when 'Append' is creating so much garbage ;) !].
>
> fun {LoadData FILE}
> case {FILE getS($)}
> of false then nil
> [] DATUM then {String.toFloat DATUM}|{LoadData FILE}
> end
> end
>
Thank you for the pointer :) ! My knowledge of Oz pattern matching [and its
idioms, in general] is, at this stage, quite minimal.
I actually ordered the CTM book yesterday but was told not to expect
delivery for a few weeks, so I'll be making do with the online
documentation, and otherwise stumbling along through trial and error, until
then.
>
> Regarding your problem, I don't remember to have read
> something similar in the past. Have you checked the mailing
> list archives? BTW, you can remove spurious CR in the line
> you read with String.tokens.
>
I appreciate the pointers. However I don't see why there should be a CR
character included in the returned string. On Win32 platforms CRLF is the
line terminator, and, I would expect it [that is, both characters comprising
the the line terminator] to be removed as part of the reading step. It
really doesn't strike me as being 'correct' behaviour to leave it in.
Cheers,
Anthony Borla
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