OpenEuphoria

1. Interpreter Mod We Can All Get Behind

• Posted by c.k.lester <euphoric at cklester.?o?> Nov 20, 2007
• 624 views
• Last edited Nov 21, 2007

How about block commenting? That would be awesome and could
significantly advance the cause for documenting code.

/*
Some Topic Header
Some topic discussion. Blah blah blah.
*/

Sweet!

In the meantime, for documenting your code, please get

    <a href="http://sourceforge.net/projects/eumakedoc">Euphoria MakeDoc</a>

3. Re: Interpreter Mod We Can All Get Behind

• Posted by c.k.lester <euphoric at c?leste?.com> Nov 20, 2007
• 610 views
• Last edited Nov 21, 2007

Bernie Ryan wrote:
> And How about a line continuation symbol
> 
> Example:
> 
>   "This is a long string that I want to continue on the next line __
>    so I can just use the two underscores to continue it on this line"

Why would you want that? Euphoria already ignores line breaks in code
so you can do something like

   "This is a long string that I want to continue on the next line "
   & "so I can just use the two underscores to continue it on this line"

For string sequences, just use an editor that has word wrapping. :)

Besides, it would be a pain to implement. What if my string sequence has
a double underscore in it?

5. Re: Interpreter Mod We Can All Get Behind

• Posted by CChris <christian.cuvier at agriculture.?ou?.fr> Nov 21, 2007
• 583 views

c.k.lester wrote:
> 
> Bernie Ryan wrote:
> > And How about a line continuation symbol
> > 
> > Example:
> > 
> >   "This is a long string that I want to continue on the next line __
> >    so I can just use the two underscores to continue it on this line"
> 
> Why would you want that? Euphoria already ignores line breaks in code
> so you can do something like
> 
>    "This is a long string that I want to continue on the next line "
>    & "so I can just use the two underscores to continue it on this line"
> 
> For string sequences, just use an editor that has word wrapping. :)
> 
> Besides, it would be a pain to implement. What if my string sequence has
> a double underscore in it?

Other languages use """ (three double quotes) to start and end a verbatim string
(ie no escape chars, line breaks, spacing and tabbing count). This is missing in
Eu. Others use %" whatever " for the purpose. I'd rather save % for when there
will be macros of some sort, but both would be fine with me.

Also U"<unicode string>" would be desirable too. Some variatuins on U would give
more control over the unicode encoding that's desired. For instance U for UTF8,
uU for UTF16LE, Uu for UTF16BE, uUU for UTF32LE and UUu for UTF32BE? Just
suggestions.

Otherwise, what is simpler than breaking the string and using & to stitch the
lines togeter? For once, Eu isn't needlessly verbose there.

CChris

7. Re: Interpreter Mod We Can All Get Behind

• Posted by Jerry Story <story.jerry at gmail?c?m> Nov 21, 2007
• 603 views

c.k.lester wrote:
> 
> How about block commenting? That would be awesome and could
> significantly advance the cause for documenting code.
> 
> /*
> Some Topic Header
> Some topic discussion. Blah blah blah.
> */

Suppose you forget the */
Then some lines later you have another block comment.

/*
some commenting
forgot */

some code

/*
more commenting
*/

Now you are wondering what the &^%$#@ is wrong with that code.

9. Re: Interpreter Mod We Can All Get Behind

• Posted by Matt Lewis <matthewwalkerlewis at ?mai?.com> Nov 21, 2007
• 594 views

CChris wrote:
>  
> Also U"<unicode string>" would be desirable too. Some variatuins on U would
> give more control over the unicode encoding that's desired. For instance U for
> UTF8, uU for UTF16LE, Uu for UTF16BE, uUU for UTF32LE and UUu for UTF32BE?
> Just
> suggestions.

I think that you'd probably want to stick with (internally) the equivalent 
of wide characters (wchar) which are 4 bytes each.  It pretty naturally 
aligns with the sequence.

The only encoding issues would be in the files themselves, at which point,
you're correct that we probably need some way to identify how things are
encoded in the file.  I'd suggest UTF8 as the best way to encode euphoria
source, since most of the characters will be from ASCII, making UTF8
the most efficient.  But if the scanner is UTF8 enabled, is there any
real need to identify which strings are or are not unicode?  Using
sequences, there's no need to distinguish between char widths as with
C/C++.

This all assumes that the interpreter is capable of dealing with unicode.
wxEuphoria now handles it pretty seamlessly, although, of course, if you
use any funky characters, your strings will look kind of funny:

string = "This uses a unicode character: " & 2015

If we decide to go with UTF8 as the standard, we'll need to have a 
library (presumably in eu, for the front end) that is capable of 
decoding UTF8.  And then, of course, there will be all sorts of decisions
about how to handle puts/printf/etc.  But if we go with straight wide chars,
then it might actually make things a bit simpler, like it did with 
wxEuphoria (because I don't have to cast a long to a char).   Not sure
how all this would affect DOS, however.

Matt

11. Re: Interpreter Mod We Can All Get Behind

• Posted by c.k.lester <euphoric at ??lester.com> Nov 21, 2007
• 595 views

Jerry Story wrote:
> c.k.lester wrote:
> > How about block commenting? That would be awesome and could
> > significantly advance the cause for documenting code.
> > 
> > /*
> > Some Topic Header
> > Some topic discussion. Blah blah blah.
> > */
> 
> Suppose you forget the */
> Then some lines later you have another block comment.

LOL. That would be fun. :)

Actually, use a color-coding editor and it won't mess you up. They
do it that way in CSS and JavaScript.

13. Re: Interpreter Mod We Can All Get Behind

• Posted by Derek Parnell <ddparnell at bi?pond?com> Nov 21, 2007
• 608 views

Bernie Ryan wrote:
> And How about a line continuation symbol
> 
> Example:
> 
>   "This is a long string that I want to continue on the next line __
>    so I can just use the two underscores to continue it on this line"

The D programming language has the simple rule that adjacent string literals in
the text are assumed to be a single literal. Thus your example would become ...

   "This is a long string that I want to continue on the next line "
   "so I can just continue it on this line"


-- 
Derek Parnell
Melbourne, Australia
Skype name: derek.j.parnell

15. Re: Interpreter Mod We Can All Get Behind

• Posted by Jason Gade <jaygade at y?hoo.com> Nov 21, 2007
• 596 views

CChris wrote:
> Wouldn't
>    ++ -- by itself on a line, with an optional comment
> whatever text you may come up with
> scanning several lines
> and which the @#}{} interpreter will happily ignore.
> You noticed that leading whitespace doesn't count.
> ++ -- again by itself with an optional comment
> be nice?
> 
> Aren't we all using syntax highlighting when programming? It is not strictly
> necessary, of course - we could also code using a stiletto and clay tablets,
> after all. The highlighting will immediately tell you you are in a block
> comment.
> Coding technology has improved since the days of PL/1.
> 
> CChris

Well, I usually use Vim. I guess that you could compare that with using a stylus
and clay tablets ;)

But I use it with syntax highlighting as well.

For block comment, my vote would be this notation:
--* block comment --*

or even better:
--/ block comment --/

Hmm. Yeah. I have no strong opinion as to whether it should implemented, but I
like how that looks.

I had been thinking of this as well:
--/ block comment /--

Whichever.

--
A complex system that works is invariably found to have evolved from a simple
system that works.
--John Gall's 15th law of Systemantics.

"Premature optimization is the root of all evil in programming."
--C.A.R. Hoare

j.

17. Re: Interpreter Mod We Can All Get Behind

• Posted by Jason Gade <jaygade at yaho?.co?> Nov 21, 2007
• 582 views

Kenneth Rhodes wrote:
> 
> Jason Gade wrote:
> 
> > Well, I usually use Vim. I guess that you could compare that with using a
> > stylus
> > and clay tablets ;)
> > 
> > But I use it with syntax highlighting as well.
> 
> Jason, would you share your Vim euphoria syntax file(s)?
> For some reason I never could get Jeremy Cowgar's to work
> for me... not sure why yours would be any different, but I thought I
> might give Vim a try again. I kinda like being able to
> do everything from the keyboard, but FAST. 
> 
> Ken Rhodes
> Folding at Home: <a
> href="http://folding.stanford.edu/">http://folding.stanford.edu/</a>
> 100% MicroSoft Free
> SuSE Linux 10.0
> No AdWare, SpyWare, or Viruses!
> Life is Good,  

Try this:
http://www.rapideuphoria.com/uploads/euphoria-vim.zip

I've only used it on Windows though. This was originally written by Travis
Beaty. I included filetype.vim -- just search it for "euphoria" to find the
relevant section. Or include the entire file.

Let me know if it works.

--
A complex system that works is invariably found to have evolved from a simple
system that works.
--John Gall's 15th law of Systemantics.

"Premature optimization is the root of all evil in programming."
--C.A.R. Hoare

j.

19. Re: Interpreter Mod We Can All Get Behind

• Posted by Pete Lomax <petelomax at bluey?nder.co?uk> Nov 21, 2007
• 603 views

Jerry Story wrote:
> 
> c.k.lester wrote:
> > 
> > How about block commenting? That would be awesome and could
> > significantly advance the cause for documenting code.
> > 
> > /*
> > Some Topic Header
> > Some topic discussion. Blah blah blah.
> > */
> 
> Suppose you forget the */
Should not be a problem: If the compiler hits <eof> while still looking it
should show eg:
C:\mystuff\test.exw:11
/* Some Topic Header
^ Error: closing block comment not found.

Rather than <eof>: error closing block comment expected, which I agree is
totally useless in comparison.

For this to work, block comments must be nestable, besides sooner or later you
would anyway want to do something like:

/*  <-- added today

procedure x()
  /*  <-- been here months

  Do this
  */
  ...
  /*

  And that
  */
end procedure
*/  <-- added today

<shameless plug>
Of course, Edita handles nested block comments like this no problem 
</shameless plug>

BTW, Positive supports block comments and also "--/*", "--*/" & "--/**/", (see
PS). However I then found line 30356 in win32lib was "--/* Begin Tone Skoda --"
which it treated as an opening block comment with no matching end. The fix took a
matter of seconds, none of which involved any kind of head scratching. (--/* -->
--!/* forced it to be treated as a line comment).

Regards,
Pete
PS The "--/*" forms are intended to be treated differently by Positive and  RDS
Eu, the latter of which should them as line comments.

21. Re: Interpreter Mod We Can All Get Behind

• Posted by Bernie Ryan <xotron at blu?frog?com> Nov 21, 2007
• 595 views

Pete Lomax wrote:
> 
> Bernie Ryan wrote:
> > Underscores are only allowed inside of identifiers.
> > If they are inside a sting they would be ignored.
> 
> That would break Edita, and there must be plenty of other stuff in the
> archives
> with quoted underscores, so obviously I'm strongly against this.
> 
> I would however accept a triple quote or backslash-just-before-the-newline
> solution.
> 
> Obviously you and Mr Underscore have had some kind of falling out and you now
> think he is a useless character,
> but the rest of us still like him 
> 
> Regards,

Pete:

How about // which would not require using the shift key when typing.


Bernie

My files in archive:
WMOTOR, XMOTOR, W32ENGIN, MIXEDLIB, EU_ENGIN, WIN32ERU, WIN32API 

Can be downloaded here:
http://www.rapideuphoria.com/cgi-bin/asearch.exu?dos=on&win=on&lnx=on&gen=on&keywords=bernie+ryan

23. Re: Interpreter Mod We Can All Get Behind

• Posted by Gary Shingles <eu at 53??i.co.nz> Nov 22, 2007
• 592 views

CChris wrote:

> Other languages use """ (three double quotes) to start and end a verbatim
> string
> (ie no escape chars, line breaks, spacing and tabbing count). This is missing
> in Eu. 

That's something I sometimes miss from Perl, the 'heredoc' syntax so that you
can say (in Perlese):

$text = <<"EOF";
This is the text.
This is another line.
Etc.
EOF

The difference with Euphoria is that you would never be able use the variable
substitution possible in Perl so I don't often miss it in Euphoria.

The other option I liked was the one Derek mentioned from D, automatically
concatenating sequential character strings. Though I could see the possibility of
a few missed spaces between words, but that would be a minor coding issue. eg
"The quick brown fox"
"eats lazy dogs for breakfast"

is "The quick brown foxeats lazy dogs for breakfast"

I do that with & concatenation anyway though 

That syntax doesn't really solve the variable substitution issue though too, so
you would end up using sprintf with & anyway (unless the interpreter could
recognise sprintf as a string, but that would get messy).

Gary

25. Re: Interpreter Mod We Can All Get Behind

• Posted by CChris <christian.cuvier at ?griculture.go?v.fr> Nov 22, 2007
• 600 views

Pete Lomax wrote:
> 
> Btw, what is the deal with newlines in a triple quote?
> One thing I would probably use it for is help/messagebox text, which is always
> a right pain with the " and \n"& requirements, especially if they break your
> stride/concentration when explaining something difficult.
> In this case, I would want the newlines, is this what others expect?
> Eg
> """
> one
> two
> three
> """
> is "one\ntwo\nthree\n" not "one two three".
> 

That's what I expect from a "verbatim string". Exactly what <pre>...</pre> does
in HTML. I didn't fully understand Gary's point about text substitution, very
likely because I don't speak Perl.

> Gary Shingles wrote:
> > 
> > The other option I liked was the one Derek mentioned from D, automatically 
> > concatenating sequential character strings.
> 
> I have a couple of problems with that.
> 1) It is no easier to convert:
> 
> The quick brown fox 
> jumped over the lazy dog
> 
> to:
> 
> "The quick brown fox "
> "jumped over the lazy dog"
> 
> than it is to convert it to:
> 
> "The quick brown fox "&
> "jumped over the lazy dog"
> 
> Obviously it gets messier when you've got dozens or hundreds of lines.
> Conversely, to triple quote is +6 chars total no matter how many lines.
> 
> 2) If you write, say
> }}}
<eucode>
>   constant words = {"ONE",
>                     "TWO",
>                     "THREE"
>                     "FOUR",
>                     "FIVE"}
> </eucode>
{{{

> then words[4] will be "FIVE". If anything, I'd prefer it to treat a missing
> comma as if it had found one.
> 

Agreed.

> Regards,
> Pete

27. Re: Interpreter Mod We Can All Get Behind

• Posted by Gary Shingles <eu at 5?1pi.?o.nz> Nov 22, 2007
• 581 views
• Last edited Nov 23, 2007

CChris wrote:
> 
> Pete Lomax wrote:
> > is "one\ntwo\nthree\n" not "one two three".
> > 
> 
> That's what I expect from a "verbatim string". Exactly what <pre>...</pre>
> does in HTML. I didn't fully understand Gary's point about text substitution,
> very
> likely because I don't speak Perl.

In Perl you can say (carrying on the HTML theme avoiding using tags):

$week = 48;
$author = "Gary Shingles";
$html = <<"EOF";
-HTML-
-HEAD--TITLE-Weekly report for week $week.-/TITLE--/HEAD-
-BODY-
-H1-Weekly report for week $week.-/H1-
-H2-Author: $author-/H2-
EOF
print $html;

And it will do what you expect.  But if you then say that $week = 49; it won't
update $html, it only subsitutes once what is currently defined.  In that sense
using sprintf is better (in Perl I generally search and replace tokens, like
__AUTHOR__, __WEEK__ etc on templates).

My point is though that you could never do this with Euphoria since variable
names are unadorned, that is there is nothing to distinguish that it is a
variable or a word within a string.

I'm also not saying this is a bad thing.  Perl is Perl and Euphoria is Euphoria
  Perl has a shell heritage where using something like $app =
"$EUDIR/bin/$appname"; is natural whereas Euphoria stems from the more formal
procedural languages.

So in summary, while I am in support of triple quotes for large strings I can
just see that its use will be limited.

Gary

29. Re: Interpreter Mod We Can All Get Behind

• Posted by CChris <christian.cuvier at agric?lture.g?uv.fr> Nov 23, 2007
• 600 views

Alan Oxley wrote:
> 
> How about if we could define the chars we wanted to be seen as comments:
> with comment_indicator "--"
> with comment_indicator "//"
> with comment_indicator "~"
> 
> This directive to be specified once only, and the euphoria parser will
> say there was an error if specified more than once. But keep the "--"
> as allowed for backwards compatibility.
> 
> Regards
> Alan

I hope you mean "once per file". Otherwise, see what happens when you include
two files that have a different value for the directive...

CChris