1. Euphoria Interpter ?
If Euphoria code is read and parsed before running then
Why can't the parser use the idea of of using #if #else #endif to
to control what code is read or not read by the parser
in other words conditionally process the input.
Bernie
My files in archive:
w32engin.ew mixedlib.e eu_engin.e win32eru.exw
Can be downloaded here:
http://www.rapideuphoria.com/cgi-bin/asearch.exu?dos=on&win=on&lnx=on&gen=on&keywords=bernie+ryan
2. Re: Euphoria Interpter ?
Bernie Ryan wrote:
>
>
> If Euphoria code is read and parsed before running then
> Why can't the parser use the idea of of using #if #else #endif to
> to control what code is read or not read by the parser
> in other words conditionally process the input.
>
It's definitely possible to do this. But not necessarily simple or easy.
You're basically embedding another language into euphoria--and one that
executes immediately, changing the state of the interpreter. I don't see
an easy way you could use too much of the builtin routines without some
big hacks.
Matt Lewis
3. Re: Euphoria Interpter ?
Matt Lewis wrote:
> Bernie Ryan wrote:
> > If Euphoria code is read and parsed before running then
> > Why can't the parser use the idea of of using #if #else #endif to
> > to control what code is read or not read by the parser
> > in other words conditionally process the input.
> It's definitely possible to do this. But not necessarily simple or easy.
#if platform() = LINUX then
-- do something
#else
-- do something else
#end if
> You're basically embedding another language into euphoria--and one that
> executes immediately, changing the state of the interpreter.
I don't see this, but I'm not an expert on interpreters either. So here's my
POV: For the conditional above, the interpreter can simply treat the
disqualified
code as comments, can't it? The interpreter isn't executing code, it's just
determining what should be included in the program code. So, if I'm on Linux,
the code in the else clause above will not be included in the final program
(and the lines starting with '#' get stripped as well).
This would work for dynamic includes:
#if platform() = LINUX then
include linux.e
#else
include winblows.e
#end if
-=ck
"Programming in a state of EUPHORIA."
http://www.cklester.com/euphoria/
4. Re: Euphoria Interpter ?
cklester wrote:
>
> Matt Lewis wrote:
> > Bernie Ryan wrote:
> > > If Euphoria code is read and parsed before running then
> > > Why can't the parser use the idea of of using #if #else #endif to
> > > to control what code is read or not read by the parser
> > > in other words conditionally process the input.
> > It's definitely possible to do this. But not necessarily simple or easy.
>
> #if platform() = LINUX then
> -- do something
> #else
> -- do something else
> #end if
>
> > You're basically embedding another language into euphoria--and one that
> > executes immediately, changing the state of the interpreter.
>
> I don't see this, but I'm not an expert on interpreters either. So here's my
> POV: For the conditional above, the interpreter can simply treat the
> disqualified
> code as comments, can't it? The interpreter isn't executing code, it's just
> determining what should be included in the program code. So, if I'm on Linux,
> the code in the else clause above will not be included in the final program
> (and the lines starting with '#' get stripped as well).
Well, you'd have to have a way to interpret and execute the statement after
the hash. And not let it interfere with the 'normal' operation of the
interpreter.
> This would work for dynamic includes:
>
> #if platform() = LINUX then
> include linux.e
> #else
> include winblows.e
> #end if
To do this, you'd need two symbol tables, and execute the code immediately.
Eu isn't really set up to do this anymore, and you'd have to be tricky
about swapping the symbol tables out and knowing when to interpret and
when to execute each type of code. Which is why I think it would be
easier to simply add a simplified macro language (even if it's just a
stripped down version of Eu) that gets parsed separately from normal
Eu code. Alternatively, you could write a separate preprocessor based
on the interpreter.
Matt Lewis
5. Re: Euphoria Interpter ?
This message has been heavily edited. Please see prior versions for clearer
context.
Matt Lewis wrote:
> cklester wrote:
> >
> > For the conditional above, the interpreter can simply treat the disqualified
> > code as comments, can't it?
>
> Well, you'd have to have a way to interpret and execute the statement after
> the hash.
Oh, yeah. Duh! 8)
> And not let it interfere with the 'normal' operation of the
> interpreter.
That's easy. For you, I mean. :D
> > This would work for dynamic includes:
> >
> > #if platform() = LINUX then
> > include linux.e
> > #else
> > include winblows.e
> > #end if
>
> To do this, you'd need two symbol tables, and execute the code immediately.
Oh, yeah. I told you I wasn't an expert! I guess I didn't think it would be
a big deal to be able to run "platform()" outside of the program's "space."
-=ck
"Programming in a state of EUPHORIA."
http://www.cklester.com/euphoria/
6. Re: Euphoria Interpter ?
- Posted by Bernie Ryan <xotron at bluefrog.com>
Nov 17, 2005
-
Last edited Nov 18, 2005
Matt Lewis wrote:
> It's definitely possible to do this. But not necessarily simple or easy.
> You're basically embedding another language into euphoria--and one that
> executes immediately, changing the state of the interpreter. I don't see
> an easy way you could use too much of the builtin routines without some
> big hacks.
Matt:
I don't think it is as complicated as you think. This is
what I mean.
#define LINUX -- at the top of the program I place this or #define WIN32
-- depending on what I define at top of program the parser only
-- parses the code that meets the defined condition.
#IF Linux
include linux.eu
for i = 1 to 200 do
do somthing
end for
#ELSIF WIN32
include win32.ew
for i = 1 to 200 do
do somthing
end for
#ELSE
include dos.e
for i = 1 to 200 do
do somthing
end for
#ENDIF
Bernie
My files in archive:
w32engin.ew mixedlib.e eu_engin.e win32eru.exw
Can be downloaded here:
http://www.rapideuphoria.com/cgi-bin/asearch.exu?dos=on&win=on&lnx=on&gen=on&keywords=bernie+ryan
7. Re: Euphoria Interpter ?
- Posted by Matt Lewis <matthewwalkerlewis at gmail.com>
Nov 17, 2005
-
Last edited Nov 18, 2005
Bernie Ryan wrote:
>
> Matt Lewis wrote:
> > It's definitely possible to do this. But not necessarily simple or easy.
> > You're basically embedding another language into euphoria--and one that
> > executes immediately, changing the state of the interpreter. I don't see
> > an easy way you could use too much of the builtin routines without some
> > big hacks.
>
>
> Matt:
>
> I don't think it is as complicated as you think. This is
> what I mean.
>
> #define LINUX -- at the top of the program I place this or #define WIN32
> -- depending on what I define at top of program the parser only
> -- parses the code that meets the defined condition.
>
> #IF Linux
> include linux.eu
> for i = 1 to 200 do
> do somthing
> end for
> #ELSIF WIN32
> include win32.ew
> for i = 1 to 200 do
> do somthing
> end for
> #ELSE
> include dos.e
> for i = 1 to 200 do
> do somthing
> end for
> #ENDIF
That's an example of embedding a macro language. And it would be very
useful. I would use this with wxEuphoria (I currently have a perl script
that comments and uncomments based on similar directives). However, it
would take about 5 seconds before someone else asked why they couldn't do
something much more complicated. I guess I was just thinking about that
inevitability...
Matt Lewis
8. Re: Euphoria Interpter ?
- Posted by cklester <cklester at yahoo.com>
Nov 17, 2005
-
Last edited Nov 18, 2005
Matt Lewis wrote:
> That's an example of embedding a macro language. And it would be very
> useful. I would use this with wxEuphoria (I currently have a perl script
> that comments and uncomments based on similar directives). However, it
> would take about 5 seconds before someone else asked why they couldn't do
> something much more complicated.
Let people ask. Questions never hurt anybody! At least we'd have additional,
useful functionality, upon which our empire could expand!
Sorry. Got maniacal for a second.
-=ck
"Programming in a state of EUPHORIA."
http://www.cklester.com/euphoria/
9. Re: Euphoria Interpter ?
On Thu, 17 Nov 2005 11:22:52 -0800, "Bernie Ryan"
<guest at RapidEuphoria.com> said:
> I don't think it is as complicated as you think. This is
> what I mean.
>
> #define LINUX -- at the top of the program I place this or #define WIN32
> -- depending on what I define at top of program the parser only
> -- parses the code that meets the defined condition.
>
> #IF Linux
> include linux.eu
> for i = 1 to 200 do
> do somthing
> end for
> #ELSIF WIN32
> include win32.ew
> for i = 1 to 200 do
> do somthing
> end for
> #ELSE
> include dos.e
> for i = 1 to 200 do
> do somthing
> end for
> #ENDIF
> Bernie
my $0.02: that is just so LAME. why not
include
#if linux
linux
#elsif win32
win32
#else
dos
#endif
.
#if linux
eu
#elsif win32
ew
#else
e
#endif
for
#if linux
l
#elsif win32
w
#else
d
#endif
=
....
OR
==
write/use include files which run on multiple platforms
OR
==
write a stub for each platform:
main.eu:
include linux.eu
include main.e
main.ew:
include win32.ew
include main.e
main.ex
include dos.ex
include main.e
why, oh why, mangle a platform-independent language just because you
cannot write platform-independent includes?????!!???
Pete
--
petelomax at fastmail.fm
--
http://www.fastmail.fm - Does exactly what it says on the tin
10. Re: Euphoria Interpter ?
petelomax wrote:
> On Thu, 17 Nov 2005 11:22:52 -0800, "Bernie Ryan" said:
>
>> I don't think it is as complicated as you think. This is
>> what I mean.
>>
>> #define LINUX -- at the top of the program I place this or #define WIN32
>> -- depending on what I define at top of program the parser only
>> -- parses the code that meets the defined condition.
>>
>> #IF Linux
>> include linux.eu
>> for i = 1 to 200 do
>> do somthing
>> end for
>> #ELSIF WIN32
>> include win32.ew
>> for i = 1 to 200 do
>> do somthing
>> end for
>> #ELSE
>> include dos.e
>> for i = 1 to 200 do
>> do somthing
>> end for
>> #ENDIF
>> Bernie
>
> my $0.02: that is just so LAME. why not
> include
> #if linux
> linux
> #elsif win32
> win32
> #else
> dos
> #endif
> .
> #if linux
> eu
> #elsif win32
> ew
> #else
> e
> #endif
> for
> #if linux
> l
> #elsif win32
> w
> #else
> d
> #endif
> =
> ....
>
> OR
> ==
> write/use include files which run on multiple platforms
This is the same problem as writing programs which run on multiple
platforms, just on a different level.
> OR
> ==
> write a stub for each platform:
> main.eu:
> include linux.eu
> include main.e
>
> main.ew:
> include win32.ew
> include main.e
>
> main.ex
> include dos.ex
> include main.e
After my experience, this is often not easy because of the lack of
forward referencing in Euphoria.
> why, oh why, mangle a platform-independent language just because you
> cannot write platform-independent includes?????!!???
I'm afraid I don't understand what you mean. Can you please elaborate?
Regards,
Juergen
--
Have you read a good program lately?
11. Re: Euphoria Interpter ?
cklester wrote:
>
> Matt Lewis wrote:
>
> > However, it would take about 5 seconds before someone else asked why
> > they couldn't do something much more complicated.
>
> Let people ask. Questions never hurt anybody! At least we'd have additional,
> useful functionality, upon which our empire could expand!
>
I did. And you did, didn't you? I knew I could count on you. :)
Matt Lewis
