Re: Parsing partial sentences

Hi,


On Thursday, April 27, 2017 at 8:15:18 PM UTC-5, Kaz Kylheku wrote:
>
> If we allow Pascal to be extended with a macro preprocessor,
>
> I believe I could design a system for translating C to Pascal which
> handles some macros, translating them to Pascal macros. Even some
> macros that "break" syntactic boundaries, such as "list_for_each (var,
> list) { block }".


Doug Comer wrote MAP (macro preprocessor) in 1978-9 for CDC Pascal.
(Pascal Users Group [PUG], Pascal News #17, March 1980, pages 30..40)


Free Pascal already has a preprocessor (and simple macros):
http://www.freepascal.org/docs-html/prog/progch2.html#progse4.html


> I don't believe such a project has any value beyond getting
> a pat on the back from another developer; I wouldn't spend any
> time on such a thing.


Well, in fairness, regarding your posts in comp.lang.misc three
years ago ("Wirth-ian languages"), you don't seem sympathetic
overall. I do think you underestimate their continued relevance.


> The end result might well be rejected by some
> Pascal users, due to requiring the extended dialect, whether on
> ideological grounds,


In fairness, with so many Pascal compilers and dialects and deviances
from the standards, I think most "Pascal" users are already
accustomed to various quirks.


> or on practical issues with tooling (being able to get the
> preprocessor running in a given Pascal development environment).


Keep in mind that several Pascal-to-C converters already exist (of
varying quality). It might be wiser to look at what's already been
done. I can find at least three. (Not quite the reverse but similar.)


Not sure what you mean about tooling, but FPC is quite portable, so
that isn't the main problem here.


I don't wish to discourage the OP. Certainly it's not an easy task.
Here's yet another document I stumbled upon years ago that may help:


http://www.knosof.co.uk/ctop.ps

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