[Oberon] Re (n): syntax in BB, CP, GPCP and V4 ...
Dieter
d.gloetzel at web.de
Tue Jul 25 15:07:07 CEST 2017
The source code and docu is in the attachment of my last mail.
Regards, Dieter
Am 25.07.2017 um 14:18 schrieb Jan de Kruyf:
> Would you have the source code for the *.Mod files Dieter?
>
> Jan.
>
>
> On Tue, Jul 25, 2017 at 10:00 AM, Dieter <d.gloetzel at web.de
> <mailto:d.gloetzel at web.de>> wrote:
>
> Just to remind you, that there exists a nice prettyprinter written
> by G. Feldmann, running on ETHOberon Windows plugin.
> Regards,
> Dieter
>
>
> Am 25.07.2017 um 01:44 schrieb Hans Klaver:
>> Jörg wrote:
>>
>>> Indentation is indeed a totally personal thing.
>>
>> It is interesting to catalogue the different indentation styles
>> used by some well known (and less well known) programmers of
>> Oberon and Component Pascal source code. With one of the
>> exercises of the Reiser & Wirth book as material I wrote out
>> various indentation styles.
>>
>> Crudely four styles of indentation can be discerned:
>> - No indentation (Daniel)
>> - Minimal indentation (Reiser / Mössenböck); the difference
>> between the two is in the indentation of declarations (e.g. VAR)
>> at the procedure level
>> - Classical indentation (Wirth & Gutknecht); has the most
>> consistent indentation of scope levels.
>> - Knuth indentation (Knuth / Campbell); also quite consistent,
>> but rather convoluted.
>>
>>
>> MODULE M; (* After Exercise 6.4 (p. 85) from Reiser & Wirth,
>> Programming in Oberon *)
>> IMPORT Out;
>> VAR i, j: INTEGER;
>> PROCEDURE A*;
>> VAR i: INTEGER;
>> PROCEDURE B(VAR i, j: INTEGER);
>> VAR k: INTEGER;
>> BEGIN k := i; i := j; j := k END B;
>> BEGIN i := 2; B(i, j)
>> END A;
>> PROCEDURE C*;
>> BEGIN A; i := 2*j;
>> Out.Int(i, 5); Out.Int(j, 5); Out.Ln
>> END C;
>> BEGIN
>> END M.C
>>
>> (**************************************)
>>
>> MODULE M; (* Daniel,
>> http://www.waltzballs.org/other/prog.html#track
>> <http://www.waltzballs.org/other/prog.html#track> *)
>> IMPORT Out;
>> VAR i,j:INTEGER;
>>
>> PROCEDURE A*;
>> VAR i:INTEGER;
>>
>> PROCEDURE B(VAR i,j:INTEGER);
>> VAR k:INTEGER;
>> BEGIN k:=i;i:=j;j:=kEND B;
>>
>> BEGIN i:=2;B(i,j)
>> END A;
>>
>> PROCEDURE C*;
>> BEGIN A;i:=2*j;
>> Out.Int(i,5);Out.Int(j,5);Out.Ln
>> END C;
>>
>> BEGIN
>> END M.C
>>
>> (**************************************)
>>
>> MODULE M; (* M. Reiser, The Oberon System
>> and M. Reiser & N. Wirth, Programming in Oberon *)
>> IMPORT Out;
>> VAR i, j: INTEGER;
>>
>> PROCEDURE A*;
>> VAR i: INTEGER;
>>
>> PROCEDURE B(VAR i, j: INTEGER);
>> VAR k: INTEGER;
>> BEGIN
>> k := i; i := j; j := k
>> END B;
>>
>> BEGIN
>> i := 2; B(i, j)
>> END A;
>>
>> PROCEDURE C*;
>> BEGIN
>> A; i := 2*j;
>> Out.Int(i, 5); Out.Int(j, 5); Out.Ln
>> END C;
>>
>> BEGIN
>> END M.C
>>
>> (*************************************)
>>
>> MODULE M; (* H. Mössenböck, Object Oriented Programming in
>> Oberon-2 *)
>> IMPORT Out;
>> VAR i, j: INTEGER;
>>
>> PROCEDURE A*;
>> VAR i: INTEGER;
>>
>> PROCEDURE B(VAR i, j: INTEGER);
>> VAR k: INTEGER;
>> BEGIN
>> k := i; i := j; j := k
>> END B;
>>
>> BEGIN
>> i := 2; B(i, j)
>> END A;
>>
>> PROCEDURE C*;
>> BEGIN
>> A; i := 2*j;
>> Out.Int(i, 5); Out.Int(j, 5); Out.Ln
>> END C;
>>
>> BEGIN
>> END M.C
>>
>> (**************************************)
>>
>> MODULE M; (* Wirth & Gutknecht, Project Oberon *)
>> IMPORT Out;
>> VAR i, j: INTEGER;
>>
>> PROCEDURE A*;
>> VAR i: INTEGER;
>>
>> PROCEDURE B(VAR i, j: INTEGER);
>> VAR k: INTEGER;
>> BEGIN
>> k := i; i := j; j := k
>> END B;
>>
>> BEGIN
>> i := 2; B(i, j)
>> END A;
>>
>> PROCEDURE C*;
>> BEGIN
>> A; i := 2*j;
>> Out.Int(i, 5); Out.Int(j, 5); Out.Ln
>> END C;
>>
>> BEGIN
>> END M.C
>>
>> (**************************************)
>>
>> MODULE M; (* Knuth. E.g. see: http://brokestream.com/tex.pdf *)
>> IMPORT Out;
>> VAR i, j: INTEGER;
>>
>> PROCEDURE A*;
>> VAR i: INTEGER;
>>
>> PROCEDURE B(VAR i, j: INTEGER);
>> VAR k: INTEGER;
>> BEGIN k := i; i := j; j := k
>> END B;
>>
>> BEGIN i := 2; B(i, j)
>> END A;
>>
>> PROCEDURE C*;
>> BEGIN A; i := 2*j;
>> Out.Int(i, 5); Out.Int(j, 5); Out.Ln
>> END C;
>>
>> BEGIN
>> END M.C
>>
>> (**************************************)
>>
>> MODULE M; (* R. Campbell, Subsystem Lib for BlackBox Component
>> Framework,
>> see the Component Pascal Collection, http://www.zinnamturm.eu/ *)
>> IMPORT Out;
>> VAR
>> i, j : INTEGER;
>>
>> PROCEDURE A*;
>> VAR
>> i : INTEGER;
>>
>> PROCEDURE B(VAR i, j : INTEGER);
>> VAR
>> k : INTEGER;
>> BEGIN
>> k := i; i := j; j := k
>> END B;
>>
>> BEGIN
>> i := 2;
>> B(i, j)
>> END A;
>>
>> PROCEDURE C*;
>> BEGIN
>> A;
>> i := 2*j;
>> Out.Int(i, 5); Out.Int(j, 5); Out.Ln
>> END C;
>>
>> BEGIN
>> END M.C
>>
>>
>> Anyone can choose his or her favourite indentation style.
>>
>> I personally don't like the two extremes (Daniel and Knuth /
>> Campbell). Imho they don't follow Einstein's criterium "Make it
>> as simple as ...": Daniel's is too simplistic and Knuth's /
>> Campbell's are too convoluted.
>>
>> The classic Wirth / Gutknecht style is the only style that is
>> completely consistent: every scope has its own indentation.
>> BlackBox uses this style as standard. See:
>> https://hansklav.home.xs4all.nl/ProgrammingConventionsBB.pdf
>> <https://hansklav.home.xs4all.nl/ProgrammingConventionsBB.pdf>
>>
>> Some might find the Reiser / Mössenböck styles more aesthetically
>> pleasing because of their simplicity. Although these styles are
>> not as consistent as the Wirth / Gutknecht style, in practice
>> this doesn't matter much because there is only one module scope
>> per compilation unit, and nested procedures are rarely used in
>> Oberon programs.
>>
>> The latter styles are used in two excellent books: /The Oberon
>> System/ by Martin Reiser and /Object-Oriented Programming in
>> Oberon-2/ by Hanspeter Mössenböck. These books are the two best
>> typeset Oberon books there are (imho). Unfortunately both have
>> long been out of print. A scanned copy of /The Oberon System/ can
>> be found on the internet here:
>> http://oberoncore.ru/library/reiser_the_oberon_system_user_guide_and_programmers_manual
>> <http://oberoncore.ru/library/reiser_the_oberon_system_user_guide_and_programmers_manual> ,
>> and there's a pdf-version of /OOP in Oberon-2/ here:
>> http://ssw.jku.at/Research/Books/Oberon2.pdf
>> <http://ssw.jku.at/Research/Books/Oberon2.pdf> . In this pdf the
>> source code indentation is not rendered entirely accurately, so
>> also have look at a scanned version of this book:
>> https://books.google.nl/books?id=BseoCAAAQBAJ&printsec=frontcover&dq=object+oriented+programming+in+oberon-2&hl=nl&sa=X&redir_esc=y#v=onepage&q=object%20oriented%20programming%20in%20oberon-2&f=false
>> <https://books.google.nl/books?id=BseoCAAAQBAJ&printsec=frontcover&dq=object+oriented+programming+in+oberon-2&hl=nl&sa=X&redir_esc=y#v=onepage&q=object%20oriented%20programming%20in%20oberon-2&f=false>
>>
>> --
>> Hans Klaver
>>
>>
>>
>>
>>
>>
>>
>> --
>> Oberon at lists.inf.ethz.ch <mailto:Oberon at lists.inf.ethz.ch> mailing list for ETH Oberon and related systems
>> https://lists.inf.ethz.ch/mailman/listinfo/oberon
>> <https://lists.inf.ethz.ch/mailman/listinfo/oberon>
>
> --
> ____________________________________
> Dr. Dieter Glötzel
> Im Rosengarten 27
> 64367 Mühltal
> Tel.: 06151 / 360 82 72
>
> -- Oberon at lists.inf.ethz.ch <mailto:Oberon at lists.inf.ethz.ch>
> mailing list for ETH Oberon and related systems
> https://lists.inf.ethz.ch/mailman/listinfo/oberon
> <https://lists.inf.ethz.ch/mailman/listinfo/oberon>
>
> --
> Oberon at lists.inf.ethz.ch mailing list for ETH Oberon and related systems
> https://lists.inf.ethz.ch/mailman/listinfo/oberon
--
____________________________________
Dr. Dieter Glötzel
Im Rosengarten 27
64367 Mühltal
Tel.: 06151 / 360 82 72
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