Re: [Factor-talk] Port on Z80 computers.

[Chris Double]

On Wed, Nov 24, 2021 at 9:30 PM yves gerey  wrote:
>
> I'd like to port a lightweight language to a Z80-based computer older than 
> you (the Amstrad CPC 6128), and to CP/M as well if there is interest.

A while back I played with using Factor to create and upload Z80 code
to an MP3 player. I wrote about it here:

https://bluishcoder.co.nz/2006/09/16/writing-your-own-mp3-player-firmware.html
https://bluishcoder.co.nz/2006/09/17/factor-code-to-upload-to-s1-mp3-player.html

While I don't think a port of Factor to Z80 would be a realistic task
at this stage, it'd make a great environment or remote development of
Z80 code and uploading to devices.

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Re: [Factor-talk] Peg Parsing Files

[Chris Double]

On Sun, Nov 22, 2020 at 6:15 AM Alexander Ilin  wrote:
> So, the question is, is it possible to use the peg vocab to create this 
> layered parsing architecture, where the first layer would consume a stream of 
> file input, and the second would consume a stream of tokens from the first 
> layer?

There is some support for this, as mentioned by Jon with regards to
Tokenizers. See the tail end of the following blog post which uses a
parser to parse the AST from another parser:
https://bluishcoder.co.nz/2008/04/04/factor-parsing-dsl.html

That post is out of date with regards to syntax but hopefully you get the idea.

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Re: [Factor-talk] Minimal VM?

[Chris Double]

On Sun, Sep 29, 2019 at 1:20 AM W-M  wrote:
> Are there any guides or other reference materials that
> explain the architecture, setup and concepts behind the 'bootstrapping
> compiler'?

Slava's old blog might have some stuff, although keep in mind it could
be out of date:

http://factor-language.blogspot.com/

An relevant post might be:

http://factor-language.blogspot.com/2010/01/factors-bootstrap-process-explained.html

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Re: [Factor-talk] ZeroMQ

[Chris Double]

On Sun, Jan 7, 2018 at 10:20 AM, Doug Coleman  wrote:
> You are right. You would have to use the zeromq nonblocking api, if it exists.

There's zmq_poll which you could spawn in a factor thread and run with
a low timeout to check if any zmq events are occurring:

http://api.zeromq.org/2-1:zmq-poll

There's also a way to get a file handle from a 0mq socket which you
can use select, epoll, etc on, but it has some limitations:

See ZMQ_FD here: http://api.zeromq.org/2-1:zmq-getsockopt

There's some notes on that here:
https://funcptr.net/2012/09/10/zeromq---edge-triggered-notification/

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Re: [Factor-talk] Wait for Thread

[Chris Double]

The easiest way might be to use futures:
http://docs.factorcode.org/content/article-concurrency.futures.html

eg:

[ 42 ] future ?future .
=> 42


On Thu, Dec 21, 2017 at 10:44 AM, Alexander Ilin  wrote:
> Hello!
>
>   If I spawn a thread using the threads:spawn word, is there a way to wait 
> for the thread to finish its work?
>   I need something like WaitForSingleObject(ThreadHandle, INFINITE).
>
> ---=---
>  Александр
>
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Re: [Factor-talk] Shared Object File Not Found - Ubuntu 16.04

[Chris Double]

On Tue, May 2, 2017 at 9:05 PM, Kaveh Shahbazian
 wrote:
>
> Spent some time googling on the topic, so far failed to resolve this (not a
> *nix Guru).
> It seems fit to add instructions to resolve this for those who like to give
> factor a spin.

I think you need:

sudo apt-get install libgtkglext1-dev

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Re: [Factor-talk] EBNF peg parser ensuring full parse

[Chris Double]

On Wed, Jan 18, 2017 at 4:24 AM, Jon Harper  wrote:
>
> Should we add words to do this more easily ?
> maybe
> : parse* ( string parser -- ast remaining )
> : parse-all ( string parser -- ast ) ! throws when remaining not empty
>
> Maybe EBNF: can define several words ? (but it's bad for grepability...)

I think the parse* and parse-all words are a good approach, and
document the usage with . Having EBNF: define multiple words can
result in a bit of word explosion but I think it's useful too. You can
get the functionality from an EBNF: word with code like:

EBNF: foo rule= ("a" | "b")* ;EBNF
"abbaXbba" "rule" \ foo rule (parse) remaining>>

Having EBNF: generate a foo* and  a foo-remaining would probably be more useful.

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Re: [Factor-talk] maybe{

[Chris Double]

On Sun, Dec 25, 2016 at 12:21 AM, Alexander Ilin  wrote:
>
>   That's a very useful feature, and it seems to be there for five years! But 
> why is it not described or even mentioned?

I don't know why it's not documented but it looks like an anonymous
form of UNION:. The following is equivalent:

UNION: string-or-false string POSTPONE: f ;
TUPLE: foo { name string-or-false } ;

and:

TUPLE: foo { name maybe{ string } } ;

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Re: [Factor-talk] Headless Factor

[Chris Double]

On Thu, Dec 1, 2016 at 6:22 AM, John Benediktsson  wrote:
> I just removed the call to ``g_type_init``, which has been deprecated since
> maybe glib 2.36.
>
> Want to give headless factor another try?

That worked, thanks!

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[Factor-talk] Headless Factor

[Chris Double]

What libraries are needed for a headless Factor running on a VPS?

I tried doing a "NO_UI=1 ./build.sh" but it fails at a point during
the bootstrap wanting libgobject:

3: USING: io.pathnames sequences ui.images ;
  ^
Cannot resolve C library function
Library: DLL" libgobject-2.0.so"
Symbol: g_type_init
DlError: libgobject-2.0.so: cannot open shared object file: No such
file or directory

Am I bootstrapping wrong?

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Re: [Factor-talk] Questions of a newcomer

[Chris Double]

On Thu, Nov 10, 2016 at 10:00 PM,   wrote:
> Any
> more ideas why? Is run-process blocking everyone? Is there some FFI call
> like you mentioned? Where could I start to debug this on my own?

The only difference to what you are doing and what my test did was
you're running as a script. So I tried this:

-8<-
USING: fry prettyprint kernel io namespaces sequences io.launcher
io.directories io.encodings.utf8 io.files io.files.info io.pathnames
concurrency.messaging threads math tools.threads accessors calendar ;
IN: script

self '[ "bash -c \"sleep 10\"" run-process drop 1 _ send ] "1" spawn
self '[ "bash -c \"sleep 5\"" run-process drop 2 _ send ] "2" spawn
receive .
receive .
clear
-8<-


With that I see what you are seeing. Both numbers print out after the
last thread finishes. It looks like it's buffering in this case. If I
add a 'flush' then I see them printed after 5 seconds then 10 seconds:

-8<-
USING: fry prettyprint kernel io namespaces sequences io.launcher
io.directories io.encodings.utf8 io.files io.files.info io.pathnames
concurrency.messaging threads math tools.threads accessors calendar ;
IN: script

self '[ "bash -c \"sleep 10\"" run-process drop 1 _ send ] "1" spawn
self '[ "bash -c \"sleep 5\"" run-process drop 2 _ send ] "2" spawn
receive . flush
receive . flush
clear
-8<-

Could this fix your issue?

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[Factor-talk] Distributed Messaging Fixes

[Chris Double]

I was working through my factor-articles document [1] to update with a
recent Factor version and hit some issues with the distributed
messaging functionality. I've done a pull request here:

https://github.com/factor/factor/pull/1744

The issue was that for distributed messaging it really requires a
global server to exist to allow receiving messages from other nodes.
Past changes moved to having the server created as a threaded server
stored in a namespace. I've reverted back to a global and adjusted the
test.

The test uses a hard coded port - I couldn't work out how to do a
random port with a threaded server.

[1] https://bluishcoder.co.nz/factor-articles.pdf

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Re: [Factor-talk] Questions of a newcomer

[Chris Double]

On Wed, Nov 9, 2016 at 4:02 AM,   wrote:
>
> There are my last 2 attemps. The first, commented out version finishes
> without waiting for the threads to finish (even with the ugly hack of
> reading the state>> of the thread) while in the second the receiving
> thread doesn't read the messages as they arrive, rather its mailbox gets
> filled up and only when everyone finishes gets time to work on the
> messages. What am I doing wrong?

Nothing seems to be wrong here, but there's no obvious thread join
operation to wait on completion so Factor exits immediately even if
active threads are running.

> On the topic of factor's cooperative threads - do they run multi- or
> single-core?

The are single core co-operative threads. If you run an FFI function
that  blocks then all threads block.

> If you have some other tips on the code I'll be glad, I feel like I'm
> doing more shuffling then I might need.

I tried to duplicate the basics of your code with the following:

self '[ "bash -c \"sleep 10\"" run-process drop 1 _ send ] "1" spawn
self '[ "bash -c \"sleep 5\"" run-process drop 2 _ send ] "2" spawn
receive

This will spawn two threads that run a bash 'sleep'. The 'receive'
blocks until the shortest sleep finishes and if you run another
'receive' then it blocks until the longer one completes. This should
be what your code does too. Are you sure the git commands aren't all
completing at the same time?

Note the use of the 'fry' quotation to avoid having to curry and swap
later to pass the 'self' around btw.

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Re: [Factor-talk] Chris Double's Weblog

[Chris Double]

On Mon, Sep 21, 2015 at 6:50 PM, Alexander Ilin  wrote:
>
>   I noticed your weblog is down. Are you going to bring it up, or is it dead 
> permanently?

It's up for me: http://bluishcoder.co.nz

What error are you getting?

All the factor articles are back online now too.

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Re: [Factor-talk] connection to listener dropping in fuel mode in emacs

[Chris Double]

On Mon, Feb 9, 2015 at 5:30 PM, Michael Maul mike.m...@gmail.com wrote:

 Also seems I canont comment the #concatenative chennel on freenode

I think #concatenative requires you to be a registered user on freenode.

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Re: [Factor-talk] Multithreading in Factor

[Chris Double]

On Thu, Nov 20, 2014 at 8:24 AM, Andrea Ferretti
ferrettiand...@gmail.com wrote:
 I am trying to make this work, but I have issues with the line

 myhost.com 9001 start-server

Looks like the API for starting servers/nodes has changed quite a bit.
If you look at the following file you'll see examples of current
usage:

basis/concurrency/distributed/distributed-tests.factor

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Re: [Factor-talk] Pattern matching and Algebraic Data Types

[Chris Double]

On Mon, Oct 20, 2014 at 7:55 AM, Michael Clagett mclag...@hotmail.com wrote:
 I  am about to familiarize myself with whatever facilities exist for working 
 with Algebraic Data Types and pattern matching in the vein of what Languages 
 like Haskell and ML provide.

Dan had a nice article from a while back on Concatenative Pattern Matching:

http://useless-factor.blogspot.co.nz/2007/06/concatenative-pattern-matching.html

I wrote a pattern matching vocab a while back:

http://docs.factorcode.org/content/article-match.html

Some articles on using it:

http://bluishcoder.co.nz/2006/09/05/pattern-matching-in-factor.html
http://bluishcoder.co.nz/2006/12/30/factor-pattern-matching-additions.html
http://bluishcoder.co.nz/2007/01/03/implementing-concatenative-words-with.html

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Re: [Factor-talk] Multithreading in Factor

[Chris Double]

ZeroMQ has a non-blocking mode. You can get a file descriptor that can
be passed to select/epoll/kqueue. Factor has its own channel and
serialization system to. See:

http://docs.factorcode.org/content/article-remote-channels,remote-channels.html

On Sun, Oct 19, 2014 at 4:30 AM, Andrea Ferretti
ferrettiand...@gmail.com wrote:
 Thank you for you response. Regarding the possibility if delegating
 CPU intensive tasks to multiple tasks: what about communication? Is
 there an idiomatic way to make processes communicate without blocking?
 There is ZeroMQ, but as far as I know it is blocking. It would be nice
 to develop something like Erlang/Akka using a pool of processes and
 cooperative multithreading locally inside each process, but I am not
 sure what would be the best way to keep a channel among processes

 2014-10-15 14:40 GMT+02:00 Björn Lindqvist bjou...@gmail.com:
 Hi Andrea,

 I'm not an expert, so take what's written below with a grain of
 salt. It mostly comes from what I've snapped up from varius places and
 reading the mailing list archive (eg
 http://search.gmane.org/?query=threadinggroup=comp.lang.factor.generalsort=relevance).

 2014-10-13 18:14 GMT+02:00 Andrea Ferretti ferrettiand...@gmail.com:
 Hi, I have read in various places, including this mailing list, that
 Factor does not currently have support for (preemptive, kernel-level)
 multithreading, and that adding support for that would require a great
 deal of changes, since the underlying VM and many core words are not
 thread-safe.

 It's true that Factor doesn't have preemptive, kernel-level threading
 (I'll just write threading from now on when I refer to this
 particular brand of threading) and that adding it would probably
 require a lot of engineering and restructuring work. But if you dig
 into the source, and read the previous discussions, it's clear that
 adding threading was always the idea and the Factor VM has been
 architected to make it simple to add in the future.

 Whether it actually is simple or not, is a different matter. But it's
 much different from, say, the CPython VM which is implemented in such
 a way that it would be virtually impossible to add threading.

 Most composite (non-primitive) words are thread-safe and the primitive
 words are only thread-unsafe in that critical sections aren't
 guarded by exclusion locks.

 Can anyone expand on this? Is there some place where people have
 collected some ideas about the issues that would arise and the areas
 that need work?

 I don't think there is any particularly bloody issues. It's just a lot
 of hard work.

 For example interactions between threads and gc can be very tricky. If
 two threads need to allocate memory, there needs to be some
 synchronization so that they don't end up pointing to the same chunk
 of memory. How do you make that both fast and safe?

 What happens with a threads object references if another thread forces
 a gc cycle? I guess all threads has to stop running during the gc so
 that all object references can be updated. It's even more complicated
 if one thread is in an ffi function which holds a pointer to a Factor
 object.

 What if another thread recompiles the same word a thread is running?

 If not, it would be nice to gather such information from people
 knowledgeable about the internals of factor, so that interested people
 could start make some contributions.

 I don't know if personally I would be able to contribute, but I'd love
 to if I I found something I could handle

 An alien wrapper for pthreads would be interesting. I've no idea if it
 would kind of work or break Factor badly, non-the-less it would be
 interesting to see.

 While we're at the subject of threading.. It's a great feature but a
 language VM can do without it and still be very useful. Python,
 Erlang, Node.js and Ruby all proves that. If the goal of the
 concurrency is IO throughput, then cooperative threads which Factor
 already has works really well. For cpu intensive tasks you can often
 start multiple processes instead of threading.



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Re: [Factor-talk] Factor IO similar to Node?

[Chris Double]

A Factor instance runs in a single thread. Blocking operations are
done either using non blocking sockets or similar async i/o methods.
Task switching occurs on i/o wait or explicit yielding. APIs like
ZeroMQ must be wrapped in Factor such that they use the non-block
functionality of that API. In the case of ZeroMQ you would use the
functionality that allows getting a file handle you can use
select/epoll on. You would use this in factor to suspend the factor
thread until activity on the file handle occurs at which point the
thread would wake up and continue.

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Re: [Factor-talk] Running Factor under NixOS

[Chris Double]

On Fri, Jun 13, 2014 at 6:24 AM, John Porubek jporu...@gmail.com wrote:
 So my question for Chris, or anyone else who feels like chiming in, is: What
 problems am I likely to encounter in getting Factor to run under NixOS?

You shouldn't have problems building from source. I just tested and it
builds fine. Problems happen when you run though since NixOS has a
non-standard file system layout. There is no '/usr/lib', etc. With
correct applications of LD_LIBRARY_PATH it'll run fine. The way to do
Factor development in NixOS would be to create an 'environment' like I
did in my Firefox post:

http://bluishcoder.co.nz/2014/05/15/firefox-development-on-nixos.html

This would set LD_LIBRARY_PATH to the correct locations depending on
the versions of Gtk, OpenGL, etc you are using for that particular
environment. A separate definition could be used for runtime Factor
apps to make sure they pick up the correct locations.

Let me know if you want examples or to create one for you to try. You
could use this on any Linux distribution by installing the Nix package
manager if you wanted to test without trying NixOS completely.

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Re: [Factor-talk] Serialisation with a JSON representation

[Chris Double]

On Thu, Jul 11, 2013 at 6:45 PM, Loryn Jenkins lor...@gmail.com wrote:
 1. I'm using first4 to retrieve the members of the tuple from the JSON
 representation, placing them on the stack, so they can form an input to boa.
 How would I retrieve an arbitrary number of slots onto the stack? (i.e. For
 objects have e.g. 10, 15 or 50... slots.)

Generally you don't use the stack as a data structure. You'd use a
vector or some other data structure to hold the data and append/modify
that as needed.

 3. Is there a Factor library providing a more direct serialisation format
 than JSON?

There is the serialisation vocab:

http://docs.factorcode.org/content/article-serialize.html

You can also deserialize/serialize JSON. Looking at the implementation
might help answer some of your other questions:

http://docs.factorcode.org/content/article-json.html

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Re: [Factor-talk] OAuth2 vocabulary?

[Chris Double]

On Mon, Mar 18, 2013 at 5:38 PM, Alexis Hazell alexis.haz...@gmail.com wrote:

 Do HTTPS requests require using the openssl vocab to manually wrap
 each request?

To do https requests you need to first load the urls.secure vocab:

USE: urls.secure

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[Factor-talk] Factor downloads broken

[Chris Double]

downloads.factorcode.org seems to be broken and there have been quite
a few people asking in IRC how to get a working copy of factor -
unfortunately there seems to be no way to get boot images other than
from IRC lurkers. Is the download server recoverable?

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Re: [Factor-talk] Quick Question For Chris Double

[Chris Double]

On Fri, Aug 24, 2012 at 11:29 PM, Michael Clagett mclag...@hotmail.com wrote:
 Back in December of 2006 in one of your articles on Parser Combinators you 
 reference
 a Chapter 5 on Parser Combinators from some larger work.  This is a nice
 article and it leads to wonder what the source is that it is taken from and
 whether the surrounding chapters are any good and worth reading as well.

I that that was this chapter:

http://www.bluishcoder.co.nz/II.05.ParserCombinators.pdf

It was from Part II of a book on the Clean programming language.
Unfortunately it seems to no longer be available according to:

http://wiki.clean.cs.ru.nl/Functional_Programming_in_Clean

Luckily it's rare for things to disappear completely from the net:

http://www.mmnt.net/db/0/0/ftp.cs.kun.nl/pub/CSI/SoftwEng.FunctLang/papers/cleanbook

The case studies are a good read.

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Re: [Factor-talk] Is there a Factor.js ?

[Chris Double]

There also was fjsc. Not sure if it still works but the source is in
the repository somewhere:

http://www.bluishcoder.co.nz/2006/12/cross-domain-json-with-fjsc.html
http://www.bluishcoder.co.nz/2006/12/continuations-added-to-fjsc.html
http://www.bluishcoder.co.nz/2006/12/factor-to-javascript-compiler-updates.html
http://www.bluishcoder.co.nz/2006/12/compiling-factor-to-javascript.html

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Re: [Factor-talk] Can't get Space Invaders to run

[Chris Double]

On Wed, Sep 21, 2011 at 9:45 AM, John Porubek jporu...@gmail.com wrote:
 I have libopenal1 installed on my Ubuntu 10.10 system. I checked in
 openal.factor and it's looking for libopenal.so. My file is
 libopenal.so.1, so I changed openal.factor to use this version. I
 also notice that openal.alut is used and alut.factor is looking for
 libalut.so. My file is libalut.so.0, so I changed alut.factor to
 use this version. From that point, the error messages pointed the way
 to entering the proper value for rom-root and now it works!

The '.so' versions of libraries are usually in '-dev' packages. So
you'd generally need a apt-get install openal-dev' or similar to pick
them up. Glad you got it working!

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Re: [Factor-talk] Can't get Space Invaders to run

[Chris Double]

On Tue, Sep 20, 2011 at 7:39 AM, John Porubek jporu...@gmail.com wrote:
 running run-invaders gives me the error message The image refers to a
 library or symbol that was not found at load time. Typing: rom-root :get

The error message is probably referring to missing OpenAL sound
libraries. Do you have OpenAL installed?

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Re: [Factor-talk] TryRuby, etc.

[Chris Double]

On Wed, Aug 24, 2011 at 12:25 PM, Andrew Pennebaker
andrew.penneba...@gmail.com wrote:
 Has anyone made an interactive online tutorial for Factor comparable to
 TryRuby?

I used to run an Factor to JavaScript instance online. I think the
code 'fjsc' still in the repository. Blog posts about it here:

http://www.bluishcoder.co.nz/2006/12/12/compiling-factor-to-javascript.html
http://www.bluishcoder.co.nz/2006/12/17/factor-to-javascript-compiler-updates.html
http://www.bluishcoder.co.nz/2006/12/18/continuations-added-to-fjsc.html
http://www.bluishcoder.co.nz/2006/12/18/cross-domain-json-with-fjsc.html

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Re: [Factor-talk] factorcode.org needs a favicon

[Chris Double]

On Tue, May 10, 2011 at 8:40 PM, Kartik Agaram a...@akkartik.com wrote:
 Ah I hadn't seen that. Yeah anything's fine. I did a quick try at
 fitting the raptor in 16x16, but if someone can pull that off, great!
 (misc/icons/Factor.ico is 48x48 - will browsers accept it?)

They should accept it, yes.

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Re: [Factor-talk] factor scripts

[Chris Double]

On Tue, May 10, 2011 at 9:19 PM, Kartik Agaram a...@akkartik.com wrote:
 $ echo 2 2 + |./factor

This runs the code piped to the listener, which has a number of
vocabularies automatically USE:'d.

 $ echo 2 2 +  x; ./factor x

This reads the file and runs that. This never has vocabs automatically
USE:'d. You'll need to add USE: or USING: definitions for the vocabs
that words in the file use. In this case, USE: math for the '+' word.

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Re: [Factor-talk] newbie question: clone

[Chris Double]

On Sat, May 7, 2011 at 3:12 AM, Zhe Hu iammegat...@gmail.com wrote:
 what's the difference between:
 V{ } clone 3 suffix!
 V{ } 3 suffix!
 I guess my question is why do we need clone, since it takes one object,
 but puts back just one object.

V{ } creates a literal vector and pushes it on the stack. When typing
at the listener this doesn't make much difference from using 'clone'
with it. But when used in a function it makes a big difference. Try
this:

: my-vec ( -- v ) V{ } ;
: my-vec2 ( -- v ) V{ } clone ;

my-vec 3 suffix! drop my-vec .
my-vec2 3 suffix! drop my-vec2 .

The V{ } creates a new vector and embeds that actual vector instance
in the function body. So the '3 suffix!' on my-vec actually modifies
the vector in the function body. Calling my-vec again shows the
modified vector.

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[Factor-talk] Wikipedia page flagged for notability and possible deletion

[Chris Double]

Just a heads up that the Factor wikipedia page has been flagged as
possibly not being notable and may be deleted:

http://en.wikipedia.org/wiki/Factor_%28programming_language%29

Someone is going on a crusade to delete non-notable languages with a
few pages already deleted or up for deletion. See here for some (eg.
Joy and Cat):

http://en.wikipedia.org/wiki/Wikipedia:WikiProject_Deletion_sorting/Computing

if you have any references that show Factor as being notable then now
would be a good time to get involved in the discussion.

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Re: [Factor-talk] Number to String

[Chris Double]

On Tue, Dec 21, 2010 at 12:28 PM, beo wulf beow...@intamp.com wrote:
   how do I convert a number to a string? The intuitive try is string, but
 this appears to only be seq - string, rather than a generic of: anything
 - string

There's a 'numberstring' in math.parser.

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Re: [Factor-talk] Parsing problem in EBNF:

[Chris Double]

On Sun, Dec 12, 2010 at 10:17 PM, Shaping shap...@charter.net wrote:
 to have the parsing work correctly.  Can you fix this to allow the newline
 character to be parsed as whitespace?

I tried to fix this once before but wasn't able to for reasons I don't
quite remember. Feel free to attack it yourself if you want. The
workaround of course is to define a word that does what you want and
just use that word in the grammar. Perhaps the reason I didn't fix it
is simply because the workaround was so easy vs the fix.

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Re: [Factor-talk] How do I construct a sequence from values onthestack

[Chris Double]

On Thu, Nov 18, 2010 at 12:52 PM, Jeff C. Britton j...@iteris.com wrote:
 I have a string that I want to match against a regular expression.
 However, group capture is not supported :(

Here's an approach using peg.ebnf. You'll also need math.parser for
'stringnumber' and peg for 'ignore'.

EBNF: parse-line
digits = [0-9]+ = [[ string stringnumber ]]
part1 = digits:a : digits:b = [[ { a b } ]]
ws =   | \t
, = , = [[ drop ignore ]]
any6 = . . . . . . = [[ string ]]
part2 = approach | detect
part3 = any | down
part4 = presence | extension | delay | pulse | etc
line = part1 ws* , any6 , part2 , part3 , part4 ,
   digits , digits , digits , digits ,
   presence , digits , presence , digits
;EBNF

1:0,z1    ,approach,any,presence,0,1,1,0,presence,0,presence,0 parse-line

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Re: [Factor-talk] How do I construct a sequence from valuesonthestack

[Chris Double]

On Thu, Nov 18, 2010 at 1:42 PM, Jim mack j...@less2do.com wrote:
 I'm having trouble with !  Is there some combination of ![a-zA-Z0-9]+ that
 will match white-space or punctuation?

There's a few ways you can do it. You should be able to use
parenthesis to use '!':

alpha = [a-zA-Z0-9]
rule = (!(alpha) .)+

Note that '!' doesn't consume from the input stream. So here we say
the current character is not an alpha character and the '.' then says
consume any character. This 'any' character won't be an alpha due to
the '!' check before it.

Or you can use a semantic rule:

: some-factor-word ( char -- char )
  ...check for what you want here... ;

rule = . ?[ some-factor-word ]?

You can also explicitly look for the stuff you want:

rule =   | , | \t | \n

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Re: [Factor-talk] How do I construct a sequence from valuesonthestack

[Chris Double]

On Thu, Nov 18, 2010 at 1:53 PM, Jim mack j...@less2do.com wrote:
 ws =   | \t = [[ string whitespace boa ]]

Change this to:

 ws = (  | \t) = [[ string whitespace boa ]]

In the first case the = is binding to the \t part of the clause.

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Re: [Factor-talk] Integrating Browser functionality into Listener: John Benediktsson's Syntax Highlighting

[Chris Double]

On Tue, Nov 16, 2010 at 11:07 PM, Shaping shap...@charter.net wrote:
 I can't find any info in Browser on quot:.

http://docs.factorcode.org/content/article-effects.html

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Re: [Factor-talk] How do I construct a sequence from values on the stack

[Chris Double]

On Wed, Nov 17, 2010 at 2:56 PM, Jeff C. Britton j...@iteris.com wrote:
 What “word” do I need?

There are worlds like 1array, 2array, 3array and 4array to produce an
array from that many items on the stack. There is also 'narray' which
is a generalisation of these for any number. eg:

2 4 8 16 32 4 narray = { 2 4 8 16 }

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Re: [Factor-talk] Furnace on Windows

[Chris Double]

On Sun, Nov 14, 2010 at 9:55 PM, Shaping shap...@charter.net wrote:
 Right now I need to recover from a fetch origin.

You don't need to recover from a 'fetch'. What that does is it
downloads the stuff you don't yet have and stores it internally in a
'remote' branch. It makes no changes at all to your checked out code
or your changes. That only happens when you do a 'rebase', 'merge' or
'pull'.

So after doing 'fetch origin' your code is in exactly the same state
as before you did the command.

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Re: [Factor-talk] Furnace on Windows

[Chris Double]

On Sun, Nov 14, 2010 at 10:01 PM, Shaping shap...@charter.net wrote:
 I know.  I'm concerned about possible collisions with modified stock code.
 I think the point Chris is making in his step 2 is that these changes need
 to be committed, first, but he did not mention old directories , only new
 ones.

'git add' is used to tell git about new files you have created. The
command to commit with the '-a' switch tells git to include all
changes in existing files as well as those you've added manually. This
is why I used:

  git commit -a -m My message

I strongly suggest created a test clone of the factor repository and
playing around with git commands in this 'safe to destroy' clone while
working through a git tutorial.

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Re: [Factor-talk] Git

[Chris Double]

On Mon, Nov 15, 2010 at 12:55 PM, Shaping shap...@charter.net wrote:

 So Git GUI makes the master branch by default, but does not put you on it.
 Why is that a good thing to do?

I have no idea, sorry. I stick with the command line.

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Re: [Factor-talk] Furnace

[Chris Double]

 I tried it and got the same error.  :c shows this:

Factor is not finding or loading the sqlite DLL. Are you sure you've
installed the DLL that Factor is expecting?

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Re: [Factor-talk] Furnace on Windows

[Chris Double]

On Sun, Nov 14, 2010 at 8:42 PM, Shaping shap...@charter.net wrote:
I have not convince myself yet that Git
 will keep old changes separate from those from the new update.

I only know the command line so I'll give you command line tips and
you can translate them to equivalent GUI commands.

1) Clone the factor respository

  git clone git://factorcode.org/git/factor.git

2) In this repository you make your own changes, including adding
stuff to the work directory, editing files, etc. Now you want to save
those in git so you can update safely.

  git add work/my-new-vocab/*
  git add any-other-new-files
  got commit -m This is a message describing my changes

3) Now you want to retrieve the latest changes from the factor repository:

  git fetch origin

4) Note that step (3) only retrieved the changes. It has made no
changes to your actual physical source code. To update that, assuming
you've done (2):

  git rebase origin/master

Replace 'origin/master' with 'origin/clean-...' or whatever branch you
are using from the factor repository. Probably master as that's the
default. If there is a clash between your changes and the factor
repository you'll get the chance to edit your changes and fix the
clash. You can then do:

  git add ...file-containing-fixes
  git rebase --continue

Or, if you are panicing, you can abort the rebase and be back to just
a repository with your changes:

  git rebase --abort

These steps will ensure that your changes always are based on top of
the latest factor repository changes, making it easy to use 'git log'
and friends to see what your changes are, and to contribute them back
to factor one day.

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Re: [Factor-talk] Furnace on Windows

[Chris Double]

On Sun, Nov 14, 2010 at 8:52 PM, Chris Double chris.dou...@double.co.nz wrote:
 2) In this repository you make your own changes, including adding
 stuff to the work directory, editing files, etc. Now you want to save
 those in git so you can update safely.

  git add work/my-new-vocab/*
  git add any-other-new-files
  got commit -m This is a message describing my changes

That last line should be:

git commit -a -m This is a message describing my changes

Note that '-a' switch.

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Re: [Factor-talk] Furnace

[Chris Double]

On Sun, Nov 14, 2010 at 8:45 PM, Shaping shap...@charter.net wrote:
 I placed all three files in the Factor directory.

Are they Win 32 or Win 64 versions? Where did you get the files from?
Do they have the same names as what the sqlite vocab is expecting? you
can look in the sqlite.factor file and see the name of the DLL it is
attempting to load.

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Re: [Factor-talk] PEGs

[Chris Double]

On Thu, Nov 11, 2010 at 9:26 PM, Shaping shap...@charter.net wrote:
 How do I use the keyboard keys to cycle back through old expressions?

 Currently I have to scroll to the old position and double-click to

 re-enter it.

http://docs.factorcode.org/content/article-ui-listener.html

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Re: [Factor-talk] Docs and other topics

[Chris Double]

On Fri, Nov 12, 2010 at 8:01 PM, Shaping shap...@charter.net wrote
 Chris, I like your document, even though it is out of date.

Just to be clear the handbook.pdf is Slava's document. I just
generated it from the original source. I did produce this one which is
a collection of my blog posts:

http://www.bluishcoder.co.nz/factor-articles.pdf

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Re: [Factor-talk] PEGs

[Chris Double]

On Thu, Nov 11, 2010 at 1:18 AM, Shaping shap...@charter.net wrote:
 I've noticed that the online EBNF help is not the same as that in the local
 Help Browser.

It is the same, except for possible minor differences between Factor
versions. If you go:

peg.ebnf about

You will get the 'about' page for the peg.ebnf vocabulary. On that
page you should see a 'Documentation' heading, under which is the text
'EBNF'. Clicking on that 'EBNF' will take you to the same EBNF
documentation I linked too.

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Re: [Factor-talk] Furnace, XStreams (PEGs) and some observations about Factor

[Chris Double]

On Tue, Nov 9, 2010 at 9:38 PM, Shaping shap...@charter.net wrote:
  I need to be able to write a parser in a
 straightforward way (XStreams-style maybe) using a PEG (collection of BNF
 productions) so that I can experiment efficiently with this idea.  Does
 anyone have any experience with PEGs in Factor?

Read the help for peg.ebnf. You can do this with the following in the listener:

  peg.ebnf about

Also these blog posts:

http://www.bluishcoder.co.nz/2007/11/embedded-grammars-in-factor.html
http://www.bluishcoder.co.nz/2008/04/factor-parsing-dsl.html
http://www.bluishcoder.co.nz/2008/06/parsing-javascript-with-factor.html

The code in them is slightly out of date but combined with the
peg.ebnf help you should be able to get the idea. There are a few
peg.ebnf usage examples for a JavaScript grammar, a PL0 grammar and an
expression calculator in the Factor source.

My PDF of articles might have more up to date code examples than the blog posts:

http://www.bluishcoder.co.nz/factor-articles.pdf

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Re: [Factor-talk] PEGs

[Chris Double]

On Wed, Nov 10, 2010 at 12:47 AM, Shaping shap...@charter.net wrote:
 I tried the first two yellow blocks in this article

 http://www.bluishcoder.co.nz/2007/11/embedded-grammars-in-factor.html

The syntax has changed quite a bit since that post. The example would
now be something like:

  EBNF: expr
  digit = '1' | '2' | '3' | '4'
  number = digit digit*
  expr = number (('+' | '-') number)*
  ;EBNF

Then:
  123+456 expr

Will result in a parse tree left on the stack. The EBNF: name ...
;EBNF expression results in a word with 'name' defined that parses the
given grammar.

You can also do:

EBNF
digit = '1' | '2' | '3' | '4'
number = digit digit*
expr = number (('+' | '-') number)*
EBNF

This leaves a parser object on the stack which you can call 'parse' on:

123 over parse .

Or:

123 [EBNF
digit = '1' | '2' | '3' | '4'
number = digit digit*
expr = number (('+' | '-') number)*
EBNF] .


The [EBNF ... EBNF] creates an anonymous quotation and calls it. This
is useful for small regexp style grammars:

123 [EBNF digit=[0-9] = [[ digit ]] rule=digit+ EBNF] .


 Why have you color-coded the parse words in the HTML?

The blog was originally hosted on a server that linked to the factor
documentation for some of the words (like 'parse'). The links are dead
now.

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Re: [Factor-talk] Factor text-editor text-styler and formatter; building Factor

[Chris Double]

On Sun, Oct 31, 2010 at 8:56 PM, Shaping shap...@charter.net wrote:
 Does anyone use a socket pair to connect two communicating VMs, whether they
 are running in one OS in two threads or in two OS processes?  If so, is
 there some example code?

There are libraries for communicating across processes. There's a
distributed concurrency library and a remote channels library. Some
blog posts I did about these:

http://www.bluishcoder.co.nz/2006/08/distributed-concurrency-in-factor.html
http://www.bluishcoder.co.nz/2007/09/distributed-channels-in-factor.html

I also have a PDF with these articles included and some others:

http://www.bluishcoder.co.nz/factor-articles.pdf

Some of them are a bit out of date though but give you an idea of what
libraries exist. The help for the libraries themselves should cover
usage.

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Re: [Factor-talk] Building Factor

[Chris Double]

On Sun, Oct 31, 2010 at 10:56 PM, Shaping shap...@charter.net wrote:
 I'm still looking for the solution to my build problem.  The newly installed
 Windows 7 SDK and .NET 4.0 should be able to cooperate with newly installed
 Visual Studio 2010 Ultimate, but I cannot even get  nmake to acknowledge a
 correct INCLUDE path in order to find Windows.h.  Does anyone here use the
 published build commands here

I just tried with Visual Studio 2010 on Windows 7 32 bit. I did the
following steps which worked fine:

1) git cloned the factor repository.
2) Ran the Visual Studio Command Prompt option from the Visual
Studio start menu.
3) Changed to the factor source directory.
4) Ran: .\build-support\factor.cmd

It built fine from there.

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Re: [Factor-talk] Wiki

[Chris Double]

On Wed, Sep 29, 2010 at 9:16 PM, John Sampson jrs@ntlworld.com wrote:

 Factor looks to an outsider as if it could be quite interesting but
 on trying to explore the Wiki on features there are only blank pages.

Most of the good stuff is in the online docs:

http://docs.factorcode.org

Chris.

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Re: [Factor-talk] Change click behavior for syntactic token to link to docs for main syntax word?

[Chris Double]

On Thu, Sep 23, 2010 at 10:48 PM, Joe Groff arc...@gmail.com wrote:

 I think this behavior would also suit closing delimiters, such as }, ], 
 ;, and so on. The documentation for these words themselves is pretty 
 useless—usually, people are going to want to see the documentation for the 
 actual definition form being used, whether it be {, V{, H{, :, 
 MEMO:, or what have you. In summary, any syntactic token should link to the 
 docs of the main syntactic form it is a part of. What do you guys think?

I agree that this would be good.

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Re: [Factor-talk] Web app examples - address already in use [newbe question]

[Chris Double]

2010/9/22 Damian Dobroczyński qoo...@gmail.com:
 My system is
 Ubuntu 10.04 and is sane. Did you have similar issues before? Please, help.

I get this same issue on Ubuntu 10.04. Can you share the workaround
you did to stop the ipv6 binding?

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Re: [Factor-talk] Channels vocab

[Chris Double]

On Thu, Aug 12, 2010 at 8:55 PM, Grisha Freilikhman grish...@gmail.com wrote:
 on the same channel with senders and receivers vectors are empty.
 S: checks if receivers vector empty = push itself to the senders vector,
 just before the suspend word processed
     R thread get control.

Factor threads are cooperative. It wouldn't be possible for R thread
to get control before S suspends.

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Re: [Factor-talk] Channels vocab

[Chris Double]

On Thu, Aug 12, 2010 at 9:53 PM, Grisha Freilikhman grish...@gmail.com wrote:
 And there is no way that two threads will be running simultaneously (On
 multi-core processors) ?

Correct. The only way (at the moment)  to utilize multiple cores is to
fork or spawn another Factor instance.

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Re: [Factor-talk] A proof of concept: scripting Factor with jQuery

[Chris Double]

On 09/04/10 10:36, Henrik Huttunen wrote:
 For the lulz I created a simple jQuery interface for Factor-javascript
 interpreter.

Instead of using text/html as the type attribute of the script element 
why not use something like application/x-factor or someother factor-ish 
tag? You can then select based on this rather than the class.

As an example I do this with with my toy xy interpreter in JavaScript:

http://www.bluishcoder.co.nz/xyjs/xy.html

If you view the source of that page you'll see code like:

script type=text/x-xy
; pop   {  a} ;
; drop  pop ;
; dip   swap = / = ;
; dup   {  a\a \a   } ;
; swap  { [a b] \b \a   } ;
; jump  { [a b] \a \b \a} ;
/script

On page load I search for this blocks in:

http://www.bluishcoder.co.nz/xyjs/xyinline.js

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Re: [Factor-talk] Factor educational tools

[Chris Double]

On 03/28/2010 2:26 AM, Henrik Huttunen wrote:
  A suggestion: did you have a look at the fjsc vocab?
  I don't know whether it's functional but it's in extra,
  so there may be some hope.
 
 I don't think I've familiar with that vocab.

fjsc is a factor to javascript compiler. I have blog posts about it here:

http://www.bluishcoder.co.nz/2006/12/continuations-added-to-fjsc.html
http://www.bluishcoder.co.nz/2006/12/factor-to-javascript-compiler-updates.html
http://www.bluishcoder.co.nz/2006/12/compiling-factor-to-javascript.html
http://www.bluishcoder.co.nz/2006/12/cross-domain-json-with-fjsc.html

It should still work - I updated it a few months back. The web app for 
it is in webapps.fjsc. This should do it:

USING: http.server webapps.fjsc ;
activate-fjsc

The start the webserver at it should run.

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Re: [Factor-talk] MS-SQL

[Chris Double]

On 03/11/2010 12:25 AM, Paul Moore wrote:
 Hmm, looks like I may have been wrong. I was working from
 http://www.bluishcoder.co.nz/2007/01/odbc-interface-for-factor.html
 but that looks like it's out of date as I can't find anything in the
 current factor codebase.

It's in 'unmaintained/odbc' in the source distribution (the git 
repository). It shouldn't take much effort to get it working again for 
someone new to factor.

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Re: [Factor-talk] Error deploying webapps.ip (Linux)

[Chris Double]

On Mon, Nov 23, 2009 at 11:09 PM, Stefan Scholl ste...@no-spoon.de wrote:
 Just the speed concerns me a bit.

webapps.calculator uses the sqlite database backend which is quite
slow (sqlite isn't slow but for some reason using it as the web
database for Factor it is). Try either changing this to one of the
other backends.

Make sure you test with the development? global turned off (the
default is off so it'll only matter if you've turned it on). With this
on things are very slow.

Performance is definitely an issue though. Furnace hasn't had any
tuning yet I think. For tinyvid I run behind nginx - without this with
large number of connections Factor slows to a crawl - including the
listener running inside screen.

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Re: [Factor-talk] Error deploying webapps.ip (Linux)

[Chris Double]

On Mon, Nov 23, 2009 at 8:53 PM, Stefan Scholl ste...@no-spoon.de wrote:
 OK, thanks for the information. Listener it is then, instead of a
 deployed application. Maybe an image with all the web stuff
 already compiled in, to speed up server restarts.

Yes, you definitely want to compile the web stuff into the image
(http, furnace, etc). Otherwise server restarts will be very slow.
That said, restarts are rare. If you're just upgrading your furnace
based web app you only need to do:

refresh-all
reset-cache

And set main-responder to an instance of your webapps responder if
you've changed any of the actions.

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[Factor-talk] Changes to concurrency.distributed and channels.remote

[Chris Double]

I've added some documentation for concurrency.distributed that
includes an example on how to use it. This can be accessed when
browsing the help for that vocab or through:

concurrency.distributed.example help

It is a reworking of the stuff I wrote in my original blog post to
account for recent changes:

http://www.bluishcoder.co.nz/2006/08/distributed-concurrency-in-factor.html

The words 'register-process', 'get-remote-process' and
'unregister-process' have been renamed to 'register-remote-thread',
'get-remote-thread' and 'unregister-remote-thread' respectively. All
references to 'process' (which is what I called threads in my original
threading library for Factor) are now changed to 'thread'.

I've also fixed 'channels.remote'. This was actually broken and no
longer worked. It should now work and I've updated the example in the
help for changes as well. The help for that can be directly accessed
via:

remote.channels about

My original blog post about these was:

http://www.bluishcoder.co.nz/2007/09/distributed-channels-in-factor.html

These are available in my git repository in the 'concurrency' branch:

git://double.co.nz/git/factor.git

and hopefully in the main factor repository sometime.

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[Factor-talk] Update to Factor Articles PDF

[Chris Double]

I've updated my Factor Articles PDF file to fix bitrot that has
occurred since Factor 0.92. The first few articles now work with
latest git. This includes a fixed up example of using remote channels.
The PDF can be obtained from:

http://bluishcoder.co.nz/factor-articles.pdf

The LaTeX source for this is available from:
git://double.co.nz/git/factor-articles.git

I welcome any patches to fix up outdated articles, correct errors, or
add articles.

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Re: [Factor-talk] More consistent word names

[Chris Double]

On Thu, Oct 29, 2009 at 9:35 AM, Doug Coleman doug.cole...@gmail.com wrote:

 I removed a couple of unused words: remove-all and substitute-here.

How do you know they're unused?

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Re: [Factor-talk] More consistent word names

[Chris Double]

On Thu, Oct 29, 2009 at 10:32 AM, Doug Coleman doug.cole...@gmail.com wrote:
 I used grep.  I can add substitute-here as substitute! if you'd like.
 Remove-all, if it's useful at all, should be renamed to something else
 since sequences:remove is something quite different, and the name was
 confusing.

I don't use it at all, I just had to make a comment on a factor
change. I haven't been able to do it in so long I missed it. :-)

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Re: [Factor-talk] messaging between native vm threads

[Chris Double]

On Mon, Oct 26, 2009 at 8:37 PM, Bruce  Breeanna Rennie
bren...@dcsi.net.au wrote:
 Factor already has the ability to communicate with another server
 remotely using TCP/IP.

There's a concurrency.distributed  vocab allowing sending messages
between VM's (uses sockets). Also a channels.remote which is currently
broken due to bitrot but would be simple to fix:

http://www.bluishcoder.co.nz/2006/08/distributed-concurrency-in-factor.html
http://www.bluishcoder.co.nz/2007/09/distributed-channels-in-factor.html

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[Factor-talk] Documentation for the peg.ebnf vocabulary

[Chris Double]

I've finally written some documentation for the peg.ebnf vocabulary.
This documents the various ways of using it (EBNF:, [EBNF ... ENBF]
and EBNF ... EBNF) as well as the syntax for the EBNF language. Let
me know (or provide patches!) if I left anything out or if anything is
badly written.

You can get it now from the 'ebnf' branch of
git://double.co.nz/git/factor.git or when it gets pulled into the main
Factor repository. When loaded you can read the help from within
factor with:

  peg.ebnf about

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[Factor-talk] Fixed some unmaintained vocabs

[Chris Double]

I fixed the bitrot in some of the vocabs that were moved to
unmaintained a while back. The first is fjsc, the Factor to JavaScript
compiler. You can pull the fix from the 'fjsc' branch of
git://double.co.nz/git/factor.git.

This mainly fixes the webapp, porting it to the newer Furnace
framework. You can try it out with something like:

USE: webapps.fjsc
USE: http.server
USE: threads
activate-fjsc
[  httpd ] in-thread

Then visit http://localhost:

The other vocabs are the cpu.8080 emulator and the arcade games that
use this (space-invaders, balloon-bomber and lunar-rescue). These are
in the 'invaders' branch of the same git repository. They can be run
with:

USE: cpu.8080
/path/to/roms/ rom-root set-global
space-invaders run
balloon-bomber run
lunar-rescue run

If you have the openal libraries installed you'll get sound as well.

For more details on the rom-root and keys to play use the help articles:

space-invaders about

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Re: [Factor-talk] Factor Versus Forth --- the book

[Chris Double]

On Mon, Oct 12, 2009 at 3:19 PM, Adam hiat...@gmail.com wrote:
 Somewhere in extra is an 8080 emulator written by Chris Double that
 can even play simple game ROMs like Space Invaders.

I even had it running an 8080 Forth, inside Factor.

 If it has fallen out of maintenance it will be in the unmaintained
 folder in the main source tree.

Yes, it's in 'unmaintained/cpu/8080' and
'unmaintained/space-invaders'. The CPU emulator bitrot would be easy
to fix. The GUI side is most likely the bit that needs some work.

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Re: [Factor-talk] Factor Versus Forth --- the book

[Chris Double]

On Sun, Oct 11, 2009 at 11:44 AM, Hugh Aguilar hugoagui...@rosycrew.com wrote:
 I have an updated version. Please read it through all the way, rather than
 just go to the new sections, as there is a lot of rewriting throughout.
 Thanks for your continued help in improving this documentation.

Have you read any of the papers on Joy?

http://www.latrobe.edu.au/philosophy/phimvt/joy.html

These cover much of the origin of words like dip, etc. You mention
them in your book and seem to not quite understand why they exist so I
thought this background material might be interesting to you.

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Re: [Factor-talk] append usage

[Chris Double]

On Thu, Oct 8, 2009 at 1:42 PM, Nicholas Spies nsp...@verizon.net wrote:

 All this is well and good, but since this use of 5 instead of a sequence
 doesn't seem to be documented, should this use be avoided, or celebrated
 as an undocumented feature :-)  ?

Numbers implement the sequence protocol. This is why it works. I'm not
sure where this is documented.

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[Factor-talk] Amazon S3 vocab

[Chris Double]

A while back I wrote a vocab for using Amazon S3 (Simple Storage
Service) from Factor so I could archive tinyvid videos on S3. I've
tidied this up a bit and made it available. It's in the 's3' branch of
my git repository:

git://double.co.nz/git/factor.git

Hopefully it can be included in the main Factor distribution. Not all
functionality is available, only that which I needed for tinyvid. To
use it you need to set two dynamic variables:

  key-id - set to your Amazon S3 key
  secret-key - set to your Amazon S3 secret key

Once these are set you can use the vocab. A brief outline of the words:

buckets ( -- seq )
  Returns a sequences of buckets in your S3 area

create-bucket ( name -- )
  Create a bucket

delete-bucket ( name -- )
  Delete a bucket

keys ( bucket-name -- seq )
  Return a sequence of all keys in the given bucket

object-get ( bucket-name key -- headers data )
  Does an http-get to retrieve the object at the given key in the bucket

put-object ( data mime-type bucket-name key assoc -- )
  Stores the object under the key in the given bucket. The object has
the given mimetype. 'assoc' is contains key/values for any headers to
be associated with the object. 'data' is any Factor object that can be
used as the 'data' slot in post-data. If it's a pathname it stores
the contents of the file. If it's a stream, its' the contents of the
stream, etc. For example:

  hello world binary encode text/plain testbucket hello.txt H{
{ x-amz-acl public-read } } put-object
  hello.txt pathname text/plain testbucket hello.txt H{ {
x-amz-acl public-read } } put-object
  http://testbucket.s3.amazonaws.com/hello.txt http-get .nip .

I'll write some docs soon. Any suggestions on the interface
appreciated. Feel free to hack on the code, add new features, refactor
it, etc. I don' t mind. It's unlikely I'll be adding new features
unless I need them for tinyvid or other projects so if you want it,
add it.

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Re: [Factor-talk] Factor vs. Forth --- the book

[Chris Double]

On Tue, Oct 6, 2009 at 2:50 PM, Hugh Aguilar hugoagui...@rosycrew.com wrote:
 Well, I've taken a stab at writing some documentation comparing Factor to
 Forth. Take a look at this (www.rosycrew.org/FactorVsForth.dvi) and let me
 know if this is going in a direction that you think will be useful.

It's an interesting read - I like seeing what a Forth programmers
perspective is on Factor. Personally I find your use of the term 'real
world' odd since the meaning is obviously different depending on the
type of development you do. To me, 'real world' is any application
that gets used. Including web applications (What I tend to use and
develop in Factor) and desktop applications.

Some of the Factor examples could do with tweaking. One quick example
is your first definition of 'pars':

 : pars ( seq -- val )
dup length 1 = [ first ] [
dup first swap rest pars
] if ;
recursive

Much shorter is:

: parse ( seq -- val )
unclip [ par ] reduce ;

You should definitely investigate the use of combinators rather than
writing recursive functions. This is a strength of Factor (and similar
languages).

There have been Forth's that have quotations by the way. 4p provides
the syntax: C{ 1 2 + } to create an anonymous word, leaving the
execution pointer on the stack. You can get it here:

http://maschenwerk.de/

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Re: [Factor-talk] documentation, examples and help...

[Chris Double]

On Sat, Sep 26, 2009 at 5:16 PM, Jon Harper jon.harpe...@gmail.com wrote:
 A workaround to this problem is to use factor's online documentation
 docs.factorcode.org, which has all the vocabularies loaded.But this
 requires an Internet connection and the factor ui looks better.

Another workaround is to do development in an image with everything
loaded. The 'load-all' word will load everything for you.

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Re: [Factor-talk] documentation, examples and help...

[Chris Double]

On Sat, Sep 26, 2009 at 5:46 PM, Alex A. Naanou alex.na...@gmail.com wrote:
 BTW, still on the documentation topic, a type/object registry or
 tagging of entities in the library/docs would also be a boost in
 productivity.right now, it is simpler to find a correct
 interface/protocol than a correct type -- still searching for a
 built-in set type, it is easy to write, but experience tells me that
 using the lib is better.

Try: set apropos

This gives a list of things with 'set' in it. One of the things in the
list is a pointer to the documentation for set operations on
sequences.

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Re: [Factor-talk] list

[Chris Double]

On Sun, Sep 27, 2009 at 1:44 PM, Hugh Aguilar hugoagui...@rosycrew.com wrote:
 None of the spliting functions take an index however. All of
 them are splitting on a particular subsequence.

I think you want 'cut' or 'cut*'. This is in the Subsequences and
Slices part of the help.

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Re: [Factor-talk] documentation, examples and help...

[Chris Double]

On Sat, Sep 26, 2009 at 8:49 AM, Alex A. Naanou alex.na...@gmail.com wrote:
 so, as a relatively typical newcomer to the language I'll be stumbling
 on typical common pitfalls, IMHO, it would be useful to fix them, so,
 I'm offering to:
 1) document my journey and learning process and
 2) writeup some of the documentation and examples...


I think what's needed, and what a lot of people have asked for, is
more cookbook style documentation and tutorials. Quick examples of how
to do small talks. Most of this type of stuff is in peoples blog
posts.

You're not the first to offer to do what you're doing btw. A few
people have started, but never finished, moving on to other tasks.

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Re: [Factor-talk] Defeated by a sample loop

[Chris Double]

On Wed, Jul 29, 2009 at 2:30 AM, Darrin Thompsondarri...@gmail.com wrote:
 I was bothered by the nagging idea that there was probably an
 important utility somewhere I was missing.

In cases like this I run screaming to the locals vocab thereby at
least removing the unbalanced branches difficulties :-)

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Re: [Factor-talk] Hello world web app

[Chris Double]

On Sat, May 2, 2009 at 7:54 PM, Diego Martinelli
martinelli.di...@gmail.com wrote:
 Also, how can I inspect such erroneous responses to see what's really 
 happening?

Set the global variable development? to true:

t development? set-global

Do this form the listener. It will result in a stack trace on these
errors. It will also reload changed files on each request so is
substantially slower. Good for testing though.

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Re: [Factor-talk] question about [] [] if

[Chris Double]

On Sat, May 2, 2009 at 9:21 AM, Hugh Aguilar hugoagui...@rosycrew.com wrote:
 My understanding is that the if function does the first combinator for
 nonzero numbers and the second combinator for zero numbers.

The first combinator is run for true values and the second for false
values. Instead of using 0 you want to use f (which is the symbol for
false). Everthing apart from f is considered to be true, so 0 is true.

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[Factor-talk] Error starting factor GUI on Arch Linux

[Chris Double]

I have an error starting the Factor GUI on Arch since updating the latest code:

$ ./factor
X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  1 (X_CreateWindow)
  Serial number of failed request:  30
  Current serial number in output stream:  31

It appears to be this commit: 509869

If I revert that then the GUI starts fine.

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Re: [Factor-talk] A helpful Google Alert search string for Factor

[Chris Double]

Slava should obviously have called the language something like
742f32c65ffd18b766fa307f8de2d47d. Actually that one's not so good
either ;)

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Re: [Factor-talk] Mnemonic for cleave/spread/etc?

[Chris Double]

On Wed, Apr 1, 2009 at 1:43 PM, Adam hiat...@gmail.com wrote:
 Slava's talk graphics help:

Also this is useful:

http://elasticdog.com/2008/12/beginning-factor-shufflers-and-combinators/

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Re: [Factor-talk] Sequence initialisation.

[Chris Double]

On Sat, Mar 28, 2009 at 7:39 PM, Mariusz Nowostawski
mari...@nowostawski.org wrote:
 How I can make the word myinit to always leave { 0 0 } on top of the stack,
 regardless of how that sequence is being later manipulated in-between?

: myinit ( -- seq) { 0 0 } clone ;

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[Factor-talk] Factor http cookie bug

[Chris Double]

My server was failing some HTTP requests, sending an error back to the
client. Some investigation showed the following type of cookie being
sent by the client was the problem:

Cookie: __s=12345567;

Note the ';' at the end. No space or anything following it. This
causes a PEG parsing error that causes the request to return an error.

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Re: [Factor-talk] input, output and stack display panes in Factor.app

[Chris Double]

On Fri, Mar 6, 2009 at 1:41 AM, Svetoslav Agafonkin svet...@gmail.com wrote:

  How can I configure Factor.app to use the 3 panes on startup?

The UI changed a while ago and it no longer has the three panes. It's
changing again soon apparently so don't get too familiar with the
current look :-)

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[Factor-talk] Bug in Furnace header handling

[Chris Double]

There appears to be a bug in the way Furnace is handling headers. I've
attached a simple webapp that demonstrates it. Put this app in a
extra/webapps/badapp directory. Then do:

USE: webapps.badapp
badapp main-responder set-global
[  httpd ] in-thread

From a shell:

wget -S http://localhost:/bad
...
wget -S http://localhost:/good

Compare the contents of the Content-Disposition header shown by wget.
In the first case it's a large string of XML. This is wrong. In the
second case it's the text we specified. It appears to be headers that
have a quotation mark in it ().

Here are the two actions to compare:

: do-bad-action ( --  request )
  html/html text/html content
  attachment; filename=\foo\ Content-Disposition set-header
  ;

: bad-action ( -- action )
  action
[ do-bad-action ] display ;

: do-good-action ( --  request )
  html/html text/html content
  attachment; filename=foo Content-Disposition set-header
  ;

: good-action ( -- action )
  action
[ do-good-action ] display ;

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Description: Binary data
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[Factor-talk] Farkup and nofollow

[Chris Double]

While adding the ability to enter video descriptions in tinyvid I
noticed what I think is a bug in Farkup. The t:farkup component has an
option to make sure links have the 'nofollow' attribute. When the
farkup is rendered this comes out as:

a href=http://tinyvid.tv; nofollow=trueTinyVid!/a

The 'nofollow' syntax appears to be wrong. It should be:

a href=http://tinyvid.tv; rel=nofollowTinyVid!/a

See here for details:

http://en.wikipedia.org/wiki/Nofollow

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Re: [Factor-talk] multi-methods

[Chris Double]

On Wed, Feb 4, 2009 at 1:27 PM, Eduardo Cavazos wayo.cava...@gmail.com wrote:
 It's an important issue for me. The switch to multi-methods is going to
 be one of those tectonic shifts in the code base. I'm a little reluctant
 to begin a large project if this switch over is around the corner.

I'd be interested in knowing how much of an impact this will have on
existing code too.

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Re: [Factor-talk] Vocabularies moved to unmaintained

[Chris Double]

On Fri, Jan 30, 2009 at 2:24 PM, Daniel Ehrenberg micro...@gmail.com wrote:
 Unfortunately, I had to move some vocabularies to unmaintained because
 help-lint has been broken on them for some time.

Do the projects work and it's just warnings to do with their documentation?

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Re: [Factor-talk] Parsing - retain stack overflow

[Chris Double]

On Mon, Jan 19, 2009 at 3:35 AM, Paul Moore p.f.mo...@gmail.com wrote:

 Odd, since I'm running on Windows myself. I just downloaded the latest
 Windows x86 build and ran factor.exe no problem.

It's an issue with my machine and the software on thinkpad laptops
from what we can gather. Something causes Factor to generate an
exception whenever a key is pressed.


 Hmm, that took a couple of minutes then crashed factor!

What does 'crashed factor' mean? I suspect it means you get an out of
memory error or something?

 But I'm not sure I see the
 relevance of left recursion - the grammar

It's not relevant to your grammar. I'm saying that my pegs are
different to other peg implementations in general so performance will
be different with different grammars.


 No problem - although I'd say that usage would increase because it's
 an extremely useful module :-)

People are welcome to use it of course, but it's no longer being
developed. I'm exploring other parsing ideas instead.

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Re: [Factor-talk] Parsing - retain stack overflow

[Chris Double]

On Mon, Jan 19, 2009 at 2:22 PM, John Pallister j...@synchromesh.com wrote:
 Did you manage to incorporate everything you found interesting about
 OMeta into your Factor PEG code?

I'm mainly looking at being able to parse streams of data and do
partial parses. This is to allow parsing large inputs without
requiring the entire string to be loaded in memory. I also have been
working on making things work with sequences of data structures better
which is what provides OMeta with a lot of its power.

Some of the partial parsing stuff can be done using Factor
continuations. eg. when reaching an unexpected end of file, capture
the current continuation and resume when more input is available. But
it's difficult to manage the memory usage with that approach. I'm also
interested in exploring some of the Iteratee style of i/o. For
example, Oleg's recent example of processing tiff files was very
interesting to me.

 Sorry to all for the non-Factor post... Perhaps I should also ask
 whether your future parsing experiments might result in Factor
 libraries for the rest of us to ponder over (at the risk of further
 cranial detonations)?

If anything useful comes out of it I'll be blogging about it. I don't
see much point in writing yet another parsing library though since
there is likely to be one done by the core Factor developers soon. I'm
more interested in just playing around with ideas at the moment - it's
less time consuming that writing/documenting/supporting libraries.

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Re: [Factor-talk] Problem with regexp

[Chris Double]

On Sun, Jan 18, 2009 at 6:09 AM, Daniel Ehrenberg micro...@gmail.com wrote:
 Regexp group caputure hasn't been fully debugged yet. You should try
 using some other parsing mechanism, like pegs. Hopefully this will be
 fixed soon.

For peg.ebnf it would look something like:

em123/em [EBNF rule=em ([0-9])+ /em = [[ second ]] EBNF]

Or if you want to search for all occurences in a string:

USE: peg.search
USE: peg.ebnf

..string... EBNF rule=em ([0-9])+ /em = [[ second ]] EBNF search

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Re: [Factor-talk] Parse time greeting?

[Chris Double]

On Sun, Dec 21, 2008 at 11:16 PM, Jon Kleiser jon.klei...@usit.uio.no wrote:

 ...$ ./Factor.app/Contents/MacOS/factor -run=listener
 ( scratchpad ) : hello Hello world print ; parsing
 ( scratchpad ) hello
 Hello world

I believe that's how it's supposed to work. Now do:

: foo hello ;

and see what happens.

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Re: [Factor-talk] Some more FUEL feedback

[Chris Double]

On Sun, Dec 14, 2008 at 2:09 PM, Slava Pestov sl...@factorcode.org wrote:
 In fact C: does not begin a form, it just reads the next two tokens,
 so it should not affect indent.

I wonder if there's a way to embed this information in Factor itself.
Maybe as word properties? Then any editor can query factor for the
information. And users can change the indentation to suit their tastes
by changing Factor and have the editor pick it up.

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Re: [Factor-talk] http.client pull request

[Chris Double]

On Thu, Dec 11, 2008 at 6:56 PM, Slava Pestov [EMAIL PROTECTED] wrote:
 Also Doug is working on a big overhaul of the form submission code
 which supports multipart forms, as well as a better API for POST
 requests in general. Expect this to land in the next few days.

Is there a description of how this works or overview of the design?
I'd be interested in seeing small snippets of usage and maybe
providing feedback.

Chris.
-- 
http://www.bluishcoder.co.nz

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Re: [Factor-talk] A couple of new language features

[Chris Double]

On Tue, Dec 9, 2008 at 8:34 PM, Slava Pestov [EMAIL PROTECTED] wrote:
 Try doing that in Lisp or Haskell!

Since you asked :-)

Haskell's syntax actually makes this work quite nice enough to get
pretty close. Given a function 'while' in Haskell:

while s pred body tail

And a function doo ('do' is a reserved word I think):

doo while s pred body = while (body s) pred body

We can do:

doo while s  pred body tail

Which calls the body first like the factor example. This is because
the latter is (do (while) s pred body) not (do (while s pred body))
using Haskell's evaluation rules.

Chris.
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Re: [Factor-talk] An example for aspiring gadget writers

[Chris Double]

On Thu, Nov 27, 2008 at 11:34 PM, John Pallister [EMAIL PROTECTED] wrote:
 Creativity is great once you've mastered the idiom. Otherwise you
 just get bad poetry.

Ed creates the idioms. Many of the idioms in Factor that we use today
stem directly from things that Ed came up with and some of us (myself
included) thought he was nuts to try the ideas. Sorry Ed :-)

Chris.
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