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From: Mark Johnson <mark_h_johnson@raytheon.com>
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Newsgroups: comp.lang.ada
Subject: Re: Ada String Issue: String within Strings
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Date: Fri, 01 Jun 2001 09:04:11 -0500
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Xref: archiver1.google.com comp.lang.ada:7970
Date: 2001-06-01T09:04:11-05:00
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Xcalibre wrote:

> Just a little hello and little comment that I've enjoyed reading
> through this newsgroup.
>
> My problem is this:  I am Get_Line-ing from a file... what I want to
> do is check that line of text for a particular phrase given (not just
> a word).  I've tried using Index() and I get an Error that says...
>
> extract.adb:73:66: array type required in indexed component
>
> The code reads:
>    Get_Line (f_From, LineItem, Index);
>    while (not End_Of_File(f_From)) loop
>       Found := 0;
>       Found := Index (LineItem(1..Index), Catch);
>       if Found > 0 then
>         Put_Line(f_To, LineItem(1..Index));
>       end if;
>    end loop;
>
> where
> LineItem, Catch : String(1..1024);
> Found : Natural;
>
> Is what I am doing the right idea or is there a different built in
> function that will do what C does in comparing the text and returning
> the location of where it starts?
>
> Thanks in advance
> Andrew

I assume you are using GNAT.

Try changing the name of your "Index" variable to something else. The
following code...

with Ada.Strings.Fixed;
use Ada.Strings.Fixed;
procedure A is
   LineItem : String(1..10) := "  ABC     ";
   Catch : String(1..10) := "ABC       ";
   Jndex : Natural := 3;
   Found : Natural;

begin
   Found := Index (LineItem(1..Jndex), Catch);
end A;

does not have the same problem. Note that I renamed the local "Index" to
"Jndex" for this to work. An alternative is...

with Ada.Strings.Fixed;
use Ada.Strings.Fixed;
procedure A is
   LineItem : String(1..10) := "  ABC     ";
   Catch : String(1..10) := "ABC       ";
   Index : Natural := 3;
   Found : Natural;

begin
   Found := Ada.Strings.Fixed.Index (LineItem(1..Index), Catch);
end A;

which is a little more explicit on "which Index" you are referring to.
  --Mark

[and yes, I noticed I probably have the LineItem and Catch values
assigned wrong....]