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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: How do I write directly to a memory address?
Newsgroups: comp.lang.ada
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Date: Wed, 2 Mar 2011 12:16:03 +0100
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Date: 2011-03-02T12:16:03+01:00
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On Wed, 02 Mar 2011 01:45:27 -0800, Nasser M. Abbasi wrote:

> I wonder what you would think then of the new Java feature (in JDK 7) in
> which one can do now do a switch on a string literal?
> 
> http://tech.puredanger.com/java7/#switch
> 
> --------------------------------
> Description: Allow switch statements to use strings in the case blocks.

There are problems with this. Case statement in Ada has non-overlapping
alternatives checked at compile time. So if more or less complex patterns
are used as alternatives, which is the next logical step, it quickly
becomes undecidable. Furthermore matching against a string has too many
parameters varying from case to case (e.g. case-sensitivity). And it shall
have side effects. Usually it is a character stream to match for a pattern.
The side effect is that the matched string is consumed.

If you are interested in an Ada solution, here is one:

   http://www.dmitry-kazakov.de/ada/tables.htm

This is a library that matches strings against a list of alternatives. It
is also integrated into the parser here:

   http://www.dmitry-kazakov.de/ada/components.htm#12.4

which is table driven. In particular, see 12.4.4. You can instantiate the
generic package with an Ada enumeration type and match the source for it.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de