Re: Reading from a .cfg file

[gab@rational.com (Greg Bek)]

> On 18 Jun 2001 10:24:10 -0700, chemmie@aol.com (J J. Rauch) wrote:
> 
> >I am brand new to Ada and i need to write a package to read and parse
> >data from a .cfg file.  This package has to be compatible with both
> >Ada 83 and Ada 95 as it will be used with programs that are written
> >with both versions.
> >Any input would be very helpful because I am just starting off with
> >Ada now.  I will be writing the package using Apex Ada 95 if that
> >matters.
> >Thank you,
> >J. R.
> 

Seeing you state that you are using Apex Ada 95, I'm guessing
I know what a .cfg file is.

Within Apex configuration files (those with the .cfg) extension
are used to contain a list of views or subsystems.  The format
of the file is simply a text file with a full pathname on
each line.  If the path name doesn't resolve to a valid file/location
then it is ignored by Apex -- this allows you to put comments in the
file.

These files are most commonly used to store the imports for a view
or a subsystem.  But can also be used as input to various Apex commands,
such us Show_Usage (here the .cfg would contain a list of views/subsystems
to be searched).

So to read the .cfg file all you need is Text_Io.  The most likely
subprogram in Text_Io to use will be Get_Line.

You may want to build an abstraction that provides iterator capabilities.

Greg Bek