[fpc-devel] VMS Pascal Compiler mode

[Flávio Etrusco]

On Mon, Oct 27, 2014 at 8:37 AM, Sven Barth <pascaldragon at googlemail.com> wrote:
> On 27.10.2014 11:51, Richard Apthorp wrote:
>>
>> Hi Sven,
>>
>> Thanks for the reply. Yes some of it could be handled by a unit for
>> special types etc but not  sure what adding a new mode means or how to do
>> it, could this handle differences such as -
>> Type conversions:
>> Var::integer  instead of integer(var)
>> Passing in characters arrays:
>> Procedure Proc(str : array [A..B] of char);
>> Defaulting parameters
>> Procedure Proc(p1 : integer := 1; p2,p3:integer);
>> And calling it in different ways:
>> Proc(,2,3);
>> Proc(1,p3 := 3, p2:= 2);
>
>
> Maybe you should indeed first try to list all differences then we could help
> you with judging how hard they are to be implemented. E.g. calling arguments
> by name is already implemented for some special cases (AFAIK for
> IDispatchable interfaces or something like that) so that would already be
> there. And then we could guide you for implementing them starting from the
> easy ones to the hard ones so that you could get familiar with the compiler.
>
> Regards,
> Sven

It would be really nice if one could enable calling arguments by name
using modeswitch ;-)
http://www.freepascal.org/docs-html/prog/progsu106.html

> PS: Please keep the fpc-devel list as recipent as well (either as main To or
> as CC) so that others interested in this topic can read your messages as
> well. Maybe it would be better if you'd subscribe to the list, because then
> others don't need to CC you if they answer.
>
>
>>
>> -----Original Message-----
>> From: Sven Barth [mailto:pascaldragon at googlemail.com]
>> Sent: 25 October 2014 13:10
>> To: FPC developers' list; Richard Apthorp
>> Subject: Re: [fpc-devel] VMS Pascal Compiler mode
>>
>> On 24.10.2014 13:22, Richard Apthorp wrote:
>>>
>>> Porting a large project running on the VMS operating system written in
>>> Pascal to Linux and Free Pascal.
>>> However there is no compiler switch for HP VMS Pascal. Would be really
>>> useful if just the main syntax differences could be catered for eg:
>>> Specifying parameter names in procedure calls (instead of overload) -
>>> I could provide a list.
>>> Noticed GNU Pascal has such a compiler switch.
>>> Anyway in the middle of writing a pre-processor to make the syntax
>>> changes but wondering if anybody has done something similar?
>>> HP having just announced VMS retirement after 35 years there must be a
>>> lot of HP Pascal around some of which will need to be ported!
>>
>>
>> I'm not aware of anyone developing a compiler mode for HP VMS Pascal (or
>> Compaq Pascal as it seems to be called). So feel free to implement it
>> yourself (you could start small by only adding the new mode first and maybe
>> a compatibility unit for special type declarations that will be
>> automatically loaded like the ObjPas unit for modes Delphi and ObjFPC or the
>> MacPas unit for the Mac Pascal mode).
>>
>> Regards,
>> Sven

Regards,
Flávio