[#14464] who uses Python or Ruby, and for what? — ellard2@...01.fas.harvard.edu (-11,3-3562,3-3076)

A while ago I posted a request for people to share their experiences

12 messages 2001/05/01

[#14555] Ruby as a Mac OS/X scripting language — Dave Thomas <Dave@...>

10 messages 2001/05/02

[#14557] Arggg Bitten by the block var scope feature!!! — Wayne Scott <wscott@...>

13 messages 2001/05/02

[#14598] Re: Arggg Bitten by the block var scope feature!!! — "Conrad Schneiker" <schneik@...>

# On Thu, 3 May 2001, Wayne Scott wrote:

9 messages 2001/05/03

[#14636] Yet another "About private methods" question — Eric Jacoboni <jacoboni@...2.fr>

I'm still trying to figure out the semantics of private methods in Ruby.

39 messages 2001/05/04
[#14656] Re: Yet another "About private methods" question — Dave Thomas <Dave@...> 2001/05/04

Eric Jacoboni <jaco@teaser.fr> writes:

[#14666] Ruby and Web Applications — "Chris Montgomery" <monty@...> 2001/05/04

Greetings from a newbie,

[#14772] Re: Ruby and Web Applications — Jim Freeze <jim@...> 2001/05/07

On Sat, 5 May 2001, Chris Montgomery wrote:

[#14710] Why's Ruby so slow in this case? — Stefan Matthias Aust <sma@3plus4.de>

Sure, Ruby, being interpreted, is slower than a compiled language.

12 messages 2001/05/05

[#14881] Class/Module Information — "John Kaurin" <jkaurin@...>

It is possible to modify the following code to produce

18 messages 2001/05/09

[#15034] Re: calling .inspect on array/hash causes core dump — ts <decoux@...>

>>>>> "A" == Andreas Riedl <viisi@chello.at> writes:

15 messages 2001/05/12

[#15198] Re: Q: GUI framework with direct drawing ca pabilities? — Steve Tuckner <SAT@...>

Would it be a good idea to develop a pure Ruby GUI framework built on top of

13 messages 2001/05/15

[#15234] Pluggable sorting - How would you do it? — "Hal E. Fulton" <hal9000@...>

Hello all,

16 messages 2001/05/16

[#15549] ColdFusion for Ruby — "Michael Dinowitz" <mdinowit@...2000.com>

I don't currently use Ruby. To tell the truth, I have no real reason to. I'd

12 messages 2001/05/22

[#15569] I like ruby-chan ... — Rob Armstrong <rob@...>

Ruby is more human(e) than Python. We already have too many animals :-).

15 messages 2001/05/23

[#15601] How to avoid spelling mistakes of variable names — ndrochak@... (Nick Drochak)

Since Ruby does not require a variable to be declared, do people find

13 messages 2001/05/23

[#15734] java based interpreter and regexes — "Wayne Blair" <wayne.blair@...>

I have been thinking about the java based ruby interpreter project, and I

48 messages 2001/05/25

[#15804] is it possible to dynamically coerce objects types in Ruby? — mirian@... (Mirian Crzig Lennox)

Greetings to all. I am a newcomer to Ruby and I am exploring the

13 messages 2001/05/27
[#15807] Re: is it possible to dynamically coerce objects types in Ruby? — matz@... (Yukihiro Matsumoto) 2001/05/27

Hi,

[#15863] Experimental "in" operator for collections — Stefan Matthias Aust <sma@3plus4.de>

There's one thing where I prefer Python over Ruby. Testing whether an

13 messages 2001/05/28

[#15925] Re: Block arguments vs method arguments — ts <decoux@...>

>>>>> "M" == Mike <mike@lepton.fr> writes:

43 messages 2001/05/29
[#16070] Re: Block arguments vs method arguments — "Hal E. Fulton" <hal9000@...> 2001/05/31

----- Original Message -----

[#16081] Re: Block arguments vs method arguments — Sean Russell <ser@...> 2001/05/31

On Thu, May 31, 2001 at 11:53:17AM +0900, Hal E. Fulton wrote:

[#16088] Re: Block arguments vs method arguments — Dan Moniz <dnm@...> 2001/05/31

At 11:01 PM 5/31/2001 +0900, Sean Russell wrote:

[#15954] new keyword idea: tryreturn, tryturn or done — Juha Pohjalainen <voidjump@...>

Hello everyone!

12 messages 2001/05/29

[ruby-talk:16057] Re: java based interpreter and regexes

From: Stefan Matthias Aust <sma@3plus4.de>
Date: 2001-05-30 22:41:26 UTC
List: ruby-talk #16057
"Wayne Blair" <wayne.blair@relian.com> wrote:

>Does anyone have any experience with javacc?  I've been playing with it and
>it doesn't seem _too_ brutal.  Anyway, if you do:

Well, last weekend, I spend some time evaluating quite a few different
parser generators.  My motivation was (of course) to find a tool that
would help creating a Ruby parser in Java :-)

I nice collection of different parsers can be found here.  I'll post
the google-cache link as it seems that the original site is down right
now:
http://www.google.com/search?q=cache:seXdT50Yzq4:www.first.gmd.de/cogent/catalog/java.html+compiler+construction+java&hl=en


I wasn't really successful.  Most parsers, including javacc are LL(1)
or LL(k) parsers.  Unfortunately, Ruby can't be expressed as LL(k)
grammar, so these parsers aren't powerful enough to be used without
modification.

I checked out javacc and antlr and found both difficult to use and
strange in their syntax.  I also tried sablecc which is nice as it's I
think the only one that can generate type safe parse trees (so called
AST) which is a really nice feature.  Unfortunately, it's again only
LL(k), it has again a different syntax for its grammar and I had a
hard time to even make it run some trivial examples.  All you get as
documentation (or I overlooked something) is a somewhat dated master
thesis.  COCO/R is a nice LL(1) parser generator (and I fixed two
bugs) but I stopped trying to hack the parser to make it parse Ruby.

I think, you has to use at least an LALR(k) parser, BYACC or CUP for
example.  Unfortunately, Ruby isn't also LALR(k), not even LR(k) or
any context free grammar.  But you can work around these problems
using a custom lexer and some special built production rules.  At
least, Matz succeeded in using YACC to create a parser.

Also interesting seems to be JACCIE, a parser construction IDE written
in Java.  I'll probably look at it next weekend.  It's pased on a
Smalltalk system which I also tried - and which eventually told me
that Ruby isn't context free.  It can apply a larger set of different
parser engines on a grammar.

bye
-- 
Stefan Matthias Aust \/ Truth Until Paradox

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