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Date: Sat, 31 May 2003 13:50:04 +0200
From: Gautier Write-only <gautier@somewhere.nil>
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Subject: Re: using charles library
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Date: 2003-05-31T13:50:04+02:00
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> Roman V. Isaev:
> >p2ada also breaks on things like this: bih:=1.e-5;

Randy Brukardt wrote:

> So does Pastran. That's not surprising, that is not legal Pascal
> according to the Pascal standard.

P2Ada breaks (see test explained in the reply) only because the lexer
is unable to see "1..2" as "1" (constant), ".." (double_dot), "2"
but sees "1." and ".2"...
If a translator from Pascal was expected to only recognize standard
Pascal, it would be completely useless. No chance of going beyond a few
lines of "usual" Pascal.

> Of course, a particular compiler might allow it anyway. That's one
> difference between Ada and nearly every other programming language: Ada
> compilers are tested for conformance. An Ada compiler that tried to
> allow 1.e-5 would fail to pass the conformity tests and would be fixed.
> Other languages aren't tested, and code that doesn't work on another
> compiler is the result.

... and Pascal is a remarkable example (if not the worst) of
fragmentation into incompatible dialects - we can forgive it since
the language was designed for teaching programmation.
And this is exaclty why a Pascal->Ada translator is useful ;-)!
And, of course, a translator must understand the most possible
dialects. It should translate "bih:=1.e-5;" into "bih:=1.0e-5;"
and go on, instead of stopping.
________________________________________________________
Gautier  --  http://www.mysunrise.ch/users/gdm/gsoft.htm

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