[ruby-talk:18349] RE: Digest Articles 18282-18332 (1/4) (ruby-talk ML)

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Subject: Digest Articles 18282-18332 (1/4) (ruby-talk ML)

From ruby-talk-admin / ruby-lang.org Mon, 23 Jul 2001 17:00:03 +0900
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Posted: Sun, 22 Jul 2001 11:44:20 +0200
From: Michael Neumann <uu9r / rz.uni-karlsruhe.de>
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Subject: [ruby-talk:18282] Re: Re-loading a modified class definition
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On Sun, Jul 22, 2001 at 02:21:20PM +0900, HarryO wrote:
> Never mind.  I took a guess that there might be a special variable
that
> tracks what files have been loaded.  There is; it's $".
> 
> So, by deleting the particular file from $", I was able to force Ruby
to
> re-load the file and everything worked just fine.
> 
> What's even nicer is that the objects that were created maintained
their
> definitions even after re-loading.  Only new objects created had the
new
> definition, which is how I'd like it to be.

Try load instead of require!
This will reload a file.


Regards,

  Michael

-- 
Michael Neumann  ***  eMail uu9r / rz.uni-karlsruhe.de

From ruby-talk-admin / ruby-lang.org Mon, 23 Jul 2001 17:00:03 +0900
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Posted: Sun, 22 Jul 2001 05:48:14 -0400 (EDT)
From: Toby DiPasquale <anany / ece.villanova.edu>
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Subject: [ruby-talk:18283] New Ruby FTP Mirror
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Hello everyone,

	I have just finished setting up a new Ruby FTP Mirror here on
campus. The URL is as follows:

ftp://fearless.ece.vill.edu/pub/ruby

This server is located on the east coast of the US, at Villanova
University. It will allow a total of 50 concurrent anonymous connections
(feedback from you guys can get this raised), and will do a nightly
refresh of the ftp.ruby-lang.org server via rsync. Thanks for all the
help
in getting me started (Dave, Andy and Matz, in particular).

Enjoy, everyone! =)

Any problems connecting: please email me at the address below. I am
generally online 23 hours a day, so you will catch me.

Also, check out http://rubictm.sourceforge.net in about a month.

0100001101000010010000110100011101110101
Tobias DiPasquale
-Solaris Systems Administrator-
Villanova University ECE Dept. (www.ece.vill.edu)
-Applications Engineering Consultant-
CyberSoft, Inc. (www.cybersoft.com)
mailto: anany / ece.vill.edu
0100001101000010010000110100011101110101


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Subject: [ruby-talk:18284] environment variables
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hi ...

how can I access environment variables? 

I'm using a ruby CVS debian package and the
Ruby 1.4 Reference Manual wasn't very helpful.

jens

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> 
> how can I access environment variables? 
> 
ENV[key]

For instance

ENV['TERM']


You'll find a complete discussion of environment variables at

http://www.rubycentral.com/book/rubyworld.html

Regards,
Barry

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>>>>> "M" == Michael Neumann <uu9r / rz.uni-karlsruhe.de> writes:

M> This works fine, but has one major drawback, that you have to
M> call it explicitly. 

 Well, it exist a possibility but this make something complex.

 I can send it to you (in private e-mail) if you want to look at it and
try
 to have a better solution.


Guy Decoux

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In article <1ex67.4924$4v6.512715 / e420r-atl3.usenetserver.com>, "Michael
Neumann" <uu9r / rz.uni-karlsruhe.de> wrote:


> Try load instead of require!
> This will reload a file.

Thanks Michael.  That's precisely what I was looking for.  Saves me
doing
the fiddling myself.

Damn I love this language !!

From ruby-talk-admin / ruby-lang.org Mon, 23 Jul 2001 17:00:03 +0900
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From: matz / ruby-lang.org (Yukihiro Matsumoto)
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Hi,

In message "[ruby-talk:18270] Re: 99 bottles of sake"
    on 01/07/22, Glen Starchman <glen / enabledventures.com> writes:

|> I would like to present the inventor of Ruby with a bottle of
|> sake. Could somebody advise me a liquor store near Matz.'s place with
|> a web site and accept VISA? Feel free to join me to make the
|> number 99.

Ah, sorry.  I don't drink alcohol at all.  Try something else.

							matz.

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What is the difference between FIX and NUM? 
Why there's FIX2LONG but ther is not NUM2ULONG?


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>>>>> "A" == Aleksei Guzev <aleksei.guzev / bigfoot.com> writes:

A> What is the difference between FIX and NUM? 

 FIXNUM <= 1073741823

A> Why there's FIX2LONG but ther is not NUM2ULONG?

 ???

pigeon% grep NUM2ULONG *.h
ruby.h:#define NUM2ULONG(x) rb_num2ulong((VALUE)x)
ruby.h:#define NUM2UINT(x) NUM2ULONG(x)
pigeon% 


Guy Decoux

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>>>>> "t" == ts  <decoux / moulon.inra.fr> writes:

t>  FIXNUM <= 1073741823

 More precisely

  -1073741824 <= FIXNUM <= 1073741823


Guy Decoux


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Posted: Sun, 22 Jul 2001 19:45:43 +0400
From: "Aristarkh A Zagorodnikov" <xm / w3d.ru>
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> -----Original Message-----
> From: Yukihiro Matsumoto [mailto:matz / ruby-lang.org]
> Sent: Sunday, July 22, 2001 6:43 PM
> To: ruby-talk ML
> Subject: [ruby-talk:18288] Re: 99 bottles of sake
> 
> 
> Hi,
> 
> In message "[ruby-talk:18270] Re: 99 bottles of sake"
>     on 01/07/22, Glen Starchman <glen / enabledventures.com> writes:
> 
> |> I would like to present the inventor of Ruby with a bottle of
> |> sake. Could somebody advise me a liquor store near Matz.'s place
with
> |> a web site and accept VISA? Feel free to join me to make the
> |> number 99.
> 
> Ah, sorry.  I don't drink alcohol at all.  Try something else.
Good ... alcohol is no good ;) Maybe some fruit juice ...
cherry+blackberry+apple mix?
Offtopic theme - beware [mental note to self too] ;)

Aristarkh A Zagorodnikov, Lead Programmer, W3D Group
http://www.w3d.ru /// xm / w3d.ru /// ICQ UIN 36987938

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Date: Mon, 23 Jul 2001 00:43:47 +0900
Posted: Sun, 22 Jul 2001 21:43:08 +0600
From: "Aleksei Guzev" <aleksei.guzev / bigfoot.com>
Reply-To: ruby-talk / ruby-lang.org
Subject: [ruby-talk:18293] NUM2LONG problem :)
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Just now I met a funny problem with NUM2LONG macro.

I've written a line like the following

 return NUM2LONG( fn( x ) );

Function fn has vivid side effect and NUM2LONG calls it twice ( see its
definition ) :) 
Do not do like above!


From ruby-talk-admin / ruby-lang.org Mon, 23 Jul 2001 17:00:03 +0900
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"Aleksei Guzev" <aleksei.guzev / bigfoot.com> writes:

> Just now I met a funny problem with NUM2LONG macro.
> 
> I've written a line like the following
> 
>  return NUM2LONG( fn( x ) );
> 
> Function fn has vivid side effect and NUM2LONG calls it twice ( see
> its definition ) :) Do not do like above!

Patient: Doctor, it hurts when I type this.

Doctor: Then don't type that.


Just call rb_num2long(fn(x)) directly.



Dave

From ruby-talk-admin / ruby-lang.org Mon, 23 Jul 2001 17:00:03 +0900
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From: Ned Konz <ned / whidbey.net>
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Subject: [ruby-talk:18295] Unicode filenames and Ruby porting
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If someone were to port Ruby to Windows/CE, they would have a little 
problem: Ruby seems to assume (from a quick glance at the source) that 
filenames are made up of 1-byte characters (don't know what character
set 
it assumes). However, all file APIs in Windows/CE take and return
Unicode 
characters.

Other WinCE ports (like the Python WinCE port) just attempt to map the 
characters back and forth to ASCII (or maybe just some unspecified 8-bit

character set). However, this can lose a lot of information if you have 
users who have used the native ability to use their local character set
for 
filenames.

Are there any provisions in the Ruby source for dealing with
wide-character 
filenames?

I would think that (given its wide use in Japan) this would be an
important 
feature.

Note that Windows/NT also provides a set of Unicode APIs equivalent to
the 
ASCII ones for file operations.

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Michael Davis wrote:

> I am planning to release my version of a btree written in Ruby
sometime
> next week.  It will allow you to store terabytes of data across
multiple
> files and should allow you to quickly retrieve that data.  I have the
code
> written and tested.  I just need to revise my test scripts and
complete
> the documentation.

How does this compare to libdb-ruby, which is a Ruby interface for the 
BerkeleyDB?

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	(envelope-from aleksei.guzev / bigfoot.com)
Date: Mon, 23 Jul 2001 01:23:15 +0900
Posted: Sun, 22 Jul 2001 22:25:18 +0600
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Subject: [ruby-talk:18297] RE:  Unicode filenames and Ruby porting
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Next versions will support multibyte coding. I hope...

Now You can rebuild Your Ruby with UNICODE and _UNICODE flags set... And
some code replaced :)


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Dave Thomas <Dave / PragmaticProgrammer.com> wrote:
> "Aleksei Guzev" <aleksei.guzev / bigfoot.com> writes:
> 
> > Just now I met a funny problem with NUM2LONG macro.
> > 
> > I've written a line like the following
> > 
> >  return NUM2LONG( fn( x ) );
> > 
> > Function fn has vivid side effect and NUM2LONG calls it twice ( see
> > its definition ) :) Do not do like above!
> 
> Patient: Doctor, it hurts when I type this.
> 
> Doctor: Then don't type that.
> 
> 
> Just call rb_num2long(fn(x)) directly.

The definition should be trivially fixed, nonetheless... the rules
I've learned for the implementation of macros have been:

* if they're meant to be a block of code not returning a value, they
  should be in "do { code } while (0)"
* parameters must be parenthesized in the implementation to allow for
  arbitrary expressions without operation order interference
* all parameters should be evaluated only once.

Generally, these are all easy to do and result in much more robust
macros that don't break in ways people don't expect.

-- 
 Brian Fundakowski Feldman           \  FreeBSD: The Power to Serve!  /
 green / FreeBSD.org                    `------------------------------'



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It was a joke because I asked a silly question.  Or was it?  (hahaha)
It
was (mostly) off topic nonetheless.  This turned into an offline
discussion
with the resolution being an inverted text index (ala google) or GNU
Mifluz
( http://www.gnu.org/software/mifluz/ ).   Data structure TBD.
The data structure contenders are:
Dictionary (hash)
Skip List (Probabilistic Insertion)
http://iamwww.unibe.ch/~wenger/DA/SkipList/
Ternary Trees
http://www.ddj.com/articles/1998/9804/9804a/9804a.htm
Good ol' B-tree

Credits go to Mikkel on the solution and excellent data structure
recommendations.  Your comments / suggestions are welcome as well.

-joe

-----Original Message-----
From: Ned Konz [mailto:ned / whidbey.net]
Sent: Sunday, July 22, 2001 9:03 AM
To: ruby-talk ML; undisclosed-recipients:
Subject: [ruby-talk:18296] RE: Effecient indexing algorithm


Michael Davis wrote:

> I am planning to release my version of a btree written in Ruby
sometime
> next week.  It will allow you to store terabytes of data across
multiple
> files and should allow you to quickly retrieve that data.  I have the
code
> written and tested.  I just need to revise my test scripts and
complete
> the documentation.

How does this compare to libdb-ruby, which is a Ruby interface for the
BerkeleyDB?


From ruby-talk-admin / ruby-lang.org Mon, 23 Jul 2001 17:00:03 +0900
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My btree is written almost completely in Ruby.  I created several small
C 
functions to make searching faster.  The C functions are only needed if 
want a little better performance.  My btree basically reads and writes 
records to and from files.  I believe that Libdb-ruby allows you to use 
BerkeleyDB to also read and write records.  BerkeleyDB is written in C.
I 
know very little about BerkeleyDB but I believe it provides a lot of 
database type stuff like transaction support in addition to reading and 
writing records.  BerkeleyDB is closer to a real database than my btree
is. 
 I don't feel that BerkeleyDB has all of the features of a real database

server like PostgreSQL.  If all you need to do is quickly read and write
a 
lot of records, then using my btree will be an alternative choice to
using 
BerkeleyDB.  Here are some of the features of my btree:

- it is thread safe
- it allows multiple concurrent readers (using Ruby threads)
- it allows one concurrent writer that does not block readers (unless a 
page needs to be split or deleted)
- a btree can span many files
- many btrees can reside in the same file

The btree is a by-product of a database server I am working on.  The 
database server is written completely in Ruby.  The database server uses
my 
btree to read and write records.  I am creating the database server in 
layers such that each layer can be used as independent, stand-alone 
modules.  The btree is one of several stand-alone modules that I have 
created to support the database server.

Why write another database server when there are other great choices
like 
BerkeleyDB and PostgreSQL?  Because I love Ruby, I felt that Ruby had
all 
of the needed components to easily create one, and I choose this as my 
first Ruby project.  So far, getting the btree to work efficiently in
Ruby 
has been the only difficult challenge.

-----Original Message-----
From:	Ned Konz [SMTP:ned / whidbey.net]
Sent:	Sunday, July 22, 2001 10:03 AM
To:	ruby-talk ML; undisclosed-recipients: ;
Subject:	[ruby-talk:18296] RE:  Effecient indexing algorithm

Michael Davis wrote:

> I am planning to release my version of a btree written in Ruby
sometime
> next week.  It will allow you to store terabytes of data across
multiple
> files and should allow you to quickly retrieve that data.  I have the 
code
> written and tested.  I just need to revise my test scripts and
complete
> the documentation.

How does this compare to libdb-ruby, which is a Ruby interface for the
BerkeleyDB?