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Today's Topics:
1. Re: haskell for FPGAS (Edward Z. Yang)
2. How to structure a "speaking" fuzzy clock? (Kamil Stachowski)
3. Re: haskell for FPGAS (Benedict Eastaugh)
4. Re: How to structure a "speaking" fuzzy clock? (Daniel Fischer)
5. Re: How to structure a "speaking" fuzzy clock? (Kamil Stachowski)
----------------------------------------------------------------------
Message: 1
Date: Sun, 16 Jan 2011 09:08:49 -0500
From: "Edward Z. Yang" <[email protected]>
Subject: Re: [Haskell-beginners] haskell for FPGAS
To: David Blubaugh <[email protected]>
Cc: beginners <[email protected]>
Message-ID: <1295186844-sup-6779@ezyang>
Content-Type: text/plain; charset=UTF-8
Not quite "Haskell for FPGAs", but rather a DSL for embedded development:
http://hackage.haskell.org/package/atom
http://blog.sw17ch.com/wordpress/?p=84
Cheers,
Edward
------------------------------
Message: 2
Date: Sun, 16 Jan 2011 15:16:46 +0100
From: Kamil Stachowski <[email protected]>
Subject: [Haskell-beginners] How to structure a "speaking" fuzzy
clock?
To: [email protected]
Message-ID:
<[email protected]>
Content-Type: text/plain; charset="utf-8"
Hello,
I am writing a program, the main purpose of which is to print fuzzy time in
a casual manner, e.g. "ten to eleven" rather than "10:52". Considering my
(lack of) programming experience, I got pretty far with it with the help of
D. Fischer and B. Yorgey; you can take a look at the results at
https://github.com/caminoix/fuzzytime.
However, I also have another purpose, and that is to better learn Haskell. I
can't help the feeling that my solution might perhaps work, but is
nevertheless ugly, naive or just un-Haskell.
Therefore, I would like to ask you how you would structure such a program.
I'm not asking for an implementation, just a general idea, such as "a
datatype to keep the fuzzy time, deriving Show with a set of separate
functions for different languages".
Thanks in advance!
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Message: 3
Date: Sun, 16 Jan 2011 14:23:29 +0000
From: Benedict Eastaugh <[email protected]>
Subject: Re: [Haskell-beginners] haskell for FPGAS
To: David Blubaugh <[email protected]>
Cc: [email protected]
Message-ID:
<[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
On 16 January 2011 06:44, David Blubaugh <[email protected]> wrote:
> Has anyone developed HASKELL FOR FPGA development ??
It's probably not exactly what you want, but you could have a look at
the Reduceron.
http://www.cs.york.ac.uk/fp/reduceron/
Benedict.
------------------------------
Message: 4
Date: Sun, 16 Jan 2011 16:14:04 +0100
From: Daniel Fischer <[email protected]>
Subject: Re: [Haskell-beginners] How to structure a "speaking" fuzzy
clock?
To: [email protected]
Message-ID: <[email protected]>
Content-Type: text/plain; charset="utf-8"
On Sunday 16 January 2011 15:16:46, Kamil Stachowski wrote:
> Hello,
>
> I am writing a program, the main purpose of which is to print fuzzy time
> in a casual manner, e.g. "ten to eleven" rather than "10:52".
> Considering my (lack of) programming experience, I got pretty far with
> it with the help of D. Fischer and B. Yorgey; you can take a look at the
> results at https://github.com/caminoix/fuzzytime.
>
> However, I also have another purpose, and that is to better learn
> Haskell. I can't help the feeling that my solution might perhaps work,
> but is nevertheless ugly, naive or just un-Haskell.
>From a quick glance: not too ugly.
In checkFTConf, you have a couple of guards
| not (thing `elem` list)
which would read better using notElem,
| thing `notElem` list
checkTimeOk isn't good, better
checkTimeOk
= case break (== ':') time of
(hh, _:mm) -> let h = read hh
m = read mm
in 0 <= h && h < 24 && 0 <= m && m < 60
_ -> False
and to further guard against malformed input, you could also test
- not (null hh || null mm)
- all isDigit hh && all isDigit mm -- requires import Data,Char
The message for precision out of range should contain '<=' instead of '<'.
Are you sure you mean humane and not human?
In FuzzyTime, maybe it would be better to have the field fzLang be a new
datatype Lang instead of a String.
In toFuzzyTime, get hour and min(ute) via break (and not per reverse .
takeWhile (/= ':') . reverse), like in checkTimeOk
>
> Therefore, I would like to ask you how you would structure such a
> program.
Hmm, I would need to think about that. What I can say without thinking:
I'd use a new datatype for style and lang, and instead of checking the
validity of the FuzzyTimeConf before converting to FuzzyTime, I'd write a
conversion
foo :: FuzzyTimeConf -> Either ErrorMessage FuzzyTime
and do the checks during the conversion to not repeat work.
> I'm not asking for an implementation, just a general idea, such
> as "a datatype to keep the fuzzy time, deriving Show with a set of
> separate functions for different languages".
>
> Thanks in advance!
------------------------------
Message: 5
Date: Sun, 16 Jan 2011 19:46:30 +0100
From: Kamil Stachowski <[email protected]>
Subject: Re: [Haskell-beginners] How to structure a "speaking" fuzzy
clock?
To: Daniel Fischer <[email protected]>
Cc: [email protected]
Message-ID:
<[email protected]>
Content-Type: text/plain; charset="utf-8"
Oh dear, I didn't actually mean to make you read the whole thing! Thank you
the more!
I'm very happy that you don't think the structure is completely wrong. I was
quite worried about it. But if you say it's not too ugly, I will be able to
sleep at night again :)
Thanks a lot for the tips!
On 16 January 2011 16:14, Daniel Fischer
<[email protected]>wrote:
> On Sunday 16 January 2011 15:16:46, Kamil Stachowski wrote:
> > Hello,
> >
> > I am writing a program, the main purpose of which is to print fuzzy time
> > in a casual manner, e.g. "ten to eleven" rather than "10:52".
> > Considering my (lack of) programming experience, I got pretty far with
> > it with the help of D. Fischer and B. Yorgey; you can take a look at the
> > results at https://github.com/caminoix/fuzzytime.
> >
> > However, I also have another purpose, and that is to better learn
> > Haskell. I can't help the feeling that my solution might perhaps work,
> > but is nevertheless ugly, naive or just un-Haskell.
>
> From a quick glance: not too ugly.
>
> In checkFTConf, you have a couple of guards
>
> | not (thing `elem` list)
>
> which would read better using notElem,
>
> | thing `notElem` list
>
> checkTimeOk isn't good, better
>
> checkTimeOk
> = case break (== ':') time of
> (hh, _:mm) -> let h = read hh
> m = read mm
> in 0 <= h && h < 24 && 0 <= m && m < 60
> _ -> False
>
> and to further guard against malformed input, you could also test
> - not (null hh || null mm)
> - all isDigit hh && all isDigit mm -- requires import Data,Char
>
> The message for precision out of range should contain '<=' instead of '<'.
>
> Are you sure you mean humane and not human?
>
> In FuzzyTime, maybe it would be better to have the field fzLang be a new
> datatype Lang instead of a String.
>
> In toFuzzyTime, get hour and min(ute) via break (and not per reverse .
> takeWhile (/= ':') . reverse), like in checkTimeOk
>
> >
> > Therefore, I would like to ask you how you would structure such a
> > program.
>
> Hmm, I would need to think about that. What I can say without thinking:
>
> I'd use a new datatype for style and lang, and instead of checking the
> validity of the FuzzyTimeConf before converting to FuzzyTime, I'd write a
> conversion
>
> foo :: FuzzyTimeConf -> Either ErrorMessage FuzzyTime
>
> and do the checks during the conversion to not repeat work.
>
> > I'm not asking for an implementation, just a general idea, such
> > as "a datatype to keep the fuzzy time, deriving Show with a set of
> > separate functions for different languages".
> >
> > Thanks in advance!
>
>
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