sequential search

sequential search

[David]

Does anyone know how a sequential/linear search is created under a txt
file (to find a specific word line by line).  I have an idea how it is
done using an array, but not under a file.  Any ideas?

Thanks.

RE: sequential search

[Beard, Frank Randolph CIV]

There's good 'ol fashioned Ada.Text_Io.Get_Line.  Create a buffer
of sufficient size.  Call Get_Line to read the file line by line, and
then parse the buffer looking for the particular word (maintaining a
line counter as you go).

If your application is interactive where the user will make multiple
queries, you might be better off reading the entire file into a memory
buffer and then parsing it.  If speed and efficiency are not paramount,
then the first approach will probably suffice.

Frank

-----Original Message-----
From: David

Does anyone know how a sequential/linear search is created under a txt
file (to find a specific word line by line).  I have an idea how it is
done using an array, but not under a file.  Any ideas?

Thanks.
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Re: sequential search

[David C. Hoos]

The Line counter is maintained for you by Ada.Text_IO -- the number of
the line jus read is given by Ada.Text_IO.Line (File) - 1


----- Original Message ----- 
From: "Beard, Frank Randolph CIV" <frank.beard@navy.mil>
To: "comp.lang.ada mail to news gateway" <comp.lang.ada@ada.eu.org>
Sent: Monday, March 10, 2003 7:09 AM
Subject: RE: sequential search


There's good 'ol fashioned Ada.Text_Io.Get_Line.  Create a buffer
of sufficient size.  Call Get_Line to read the file line by line, and
then parse the buffer looking for the particular word (maintaining a
line counter as you go).

If your application is interactive where the user will make multiple
queries, you might be better off reading the entire file into a memory
buffer and then parsing it.  If speed and efficiency are not paramount,
then the first approach will probably suffice.

Frank

-----Original Message-----
From: David

Does anyone know how a sequential/linear search is created under a txt
file (to find a specific word line by line).  I have an idea how it is
done using an array, but not under a file.  Any ideas?

Thanks.
_______________________________________________
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comp.lang.ada@ada.eu.org
http://ada.eu.org/mailman/listinfo/comp.lang.ada
_______________________________________________
comp.lang.ada mailing list
comp.lang.ada@ada.eu.org
http://ada.eu.org/mailman/listinfo/comp.lang.ada

RE: sequential search

[Martin Krischik]

> -----Original Message-----
> From: David
> 
> Does anyone know how a sequential/linear search is created under a txt
> file (to find a specific word line by line).  I have an idea how it is
> done using an array, but not under a file.  Any ideas?

Since I had a similar Problem (I needed Search and Replace) I written a
Library to do the job:

http://adacl.sourceforge.net/

If you don't want to do the replace part then just have a Look at
AdaCL-File-Reader-adb to see how the file is read:

http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/adacl/adacl/Include/AdaCL-SAR-File-ReadTask.ada?rev=HEAD&content-type=text/vnd.viewcvs-markup

From there on it is just normal string manipulation

With Regards

Martin

-- 
Martin Krischik
mailto://Martin@krischik.com
http://ada.krischik.com