ANNOUNCE: string-conversions-0.1

Sönke Hahn

9 Mar 2012 9 Mar '12

10:17 a.m.

Hi all! string-conversions is a very simple package to facilitate dealing with different string types. It provides a simple type class that allows you to convert between values of different string types. It also provides type synonyms for these string types. Supported types are: - String - Strict ByteString - Lazy ByteString - Strict Text - Lazy Text http://hackage.haskell.org/package/string-conversions Any comments welcome. Cheers, Sönke

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Joachim Breitner

9 Mar 9 Mar

11:40 a.m.

Hi Sönke, Am Freitag, den 09.03.2012, 11:17 +0100 schrieb Sönke Hahn:

...

Any comments welcome.

you could elaborate the documenatation “Assumes UTF-8” – I guess this only applies to the two ByteString variants, as String and Text _should_ contain unicode codepoints and no encoding. Not that someone tries to use a String where each Char corresponds to a byte in a UTF-8 encoded string and thinks he can convert it correctly. I was about to suggest to merge this into the convertible package (to fight package proliferation), but found that it seems it is already there: http://hackage.haskell.org/packages/archive/convertible-text/0.4.0.2/doc/htm... Greetings, Joachim -- Joachim "nomeata" Breitner mail@joachim-breitner.de | nomeata@debian.org | GPG: 0x4743206C xmpp: nomeata@joachim-breitner.de | http://www.joachim-breitner.de/

Michael Snoyman

11:44 a.m.

On Fri, Mar 9, 2012 at 1:40 PM, Joachim Breitner wrote:

...

Hi Sönke,

Am Freitag, den 09.03.2012, 11:17 +0100 schrieb Sönke Hahn:

...
Any comments welcome.

you could elaborate the documenatation “Assumes UTF-8” – I guess this only applies to the two ByteString variants, as String and Text _should_ contain unicode codepoints and no encoding. Not that someone tries to use a String where each Char corresponds to a byte in a UTF-8 encoded string and thinks he can convert it correctly.

I was about to suggest to merge this into the convertible package (to fight package proliferation), but found that it seems it is already there: http://hackage.haskell.org/packages/archive/convertible-text/0.4.0.2/doc/htm...

Greetings, Joachim

-- Joachim "nomeata" Breitner mail@joachim-breitner.de | nomeata@debian.org | GPG: 0x4743206C xmpp: nomeata@joachim-breitner.de | http://www.joachim-breitner.de/

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

I'm the author of convertible-text, and I consider it deprecated (it's marked as such in the synopsis). As far as string-conversions, I'm a little concerned that it's using decodeUtf8, which can throw exceptions from pure code for invalid UTF8 sequences. I would prefer decodeUtf8With lenientDecode. Actually, my *real* preference would be that a lenient decode was the default so that we aren't exposing a partial function as the default way to decode bytes. Michael

Joachim Breitner

11:52 a.m.

Hi, Am Freitag, den 09.03.2012, 13:44 +0200 schrieb Michael Snoyman:

...

On Fri, Mar 9, 2012 at 1:40 PM, Joachim Breitner wrote:

...
I was about to suggest to merge this into the convertible package (to fight package proliferation), but found that it seems it is already there: http://hackage.haskell.org/packages/archive/convertible-text/0.4.0.2/doc/htm...

I'm the author of convertible-text, and I consider it deprecated (it's marked as such in the synopsis).

sorry, I got confused. In convertible itself, there is -- Joachim Breitner e-Mail: mail@joachim-breitner.de Homepage: http://www.joachim-breitner.de Jabber-ID: nomeata@joachim-breitner.de

Joachim Breitner

11:54 a.m.

Hi, Am Freitag, den 09.03.2012, 13:44 +0200 schrieb Michael Snoyman:

...

On Fri, Mar 9, 2012 at 1:40 PM, Joachim Breitner wrote:

...
I was about to suggest to merge this into the convertible package (to fight package proliferation), but found that it seems it is already there: http://hackage.haskell.org/packages/archive/convertible-text/0.4.0.2/doc/htm...

I'm the author of convertible-text, and I consider it deprecated (it's marked as such in the synopsis).

sorry, I got confused by the two packages. In convertible itself, there is http://hackage.haskell.org/packages/archive/convertible/1.0.11.1/doc/html/sr... which only converts between String and the two Text types, but not between ByteString because the encoding is not know there. And sorry for the partial mail. Greetings, Joachim -- Joachim Breitner e-Mail: mail@joachim-breitner.de Homepage: http://www.joachim-breitner.de Jabber-ID: nomeata@joachim-breitner.de -- Joachim "nomeata" Breitner mail@joachim-breitner.de | nomeata@debian.org | GPG: 0x4743206C xmpp: nomeata@joachim-breitner.de | http://www.joachim-breitner.de/

Sönke Hahn

2:36 p.m.

Michael Snoyman wrote:

...

I'm the author of convertible-text, and I consider it deprecated (it's marked as such in the synopsis).

As far as string-conversions, I'm a little concerned that it's using decodeUtf8, which can throw exceptions from pure code for invalid UTF8 sequences. I would prefer decodeUtf8With lenientDecode.

I wasn't aware of 'decodeUtf8With lenientDecode'. I changed it in the repo.

...

Actually, my *real* preference would be that a lenient decode was the default so that we aren't exposing a partial function as the default way to decode bytes.

Are you talking about the default in decodeUtf8? (If yes, I tend to agree.) Sönke

Michael Snoyman

2:48 p.m.

On Fri, Mar 9, 2012 at 4:36 PM, Sönke Hahn wrote:

...

Michael Snoyman wrote:

...
I'm the author of convertible-text, and I consider it deprecated (it's marked as such in the synopsis).

As far as string-conversions, I'm a little concerned that it's using decodeUtf8, which can throw exceptions from pure code for invalid UTF8 sequences. I would prefer decodeUtf8With lenientDecode.

I wasn't aware of 'decodeUtf8With lenientDecode'. I changed it in the repo.

...
Actually, my *real* preference would be that a lenient decode was the default so that we aren't exposing a partial function as the default way to decode bytes.

Are you talking about the default in decodeUtf8? (If yes, I tend to agree.)

Yes, that's what I meant. Michael

Sönke Hahn

2:10 p.m.

Hi Joachim! Joachim Breitner wrote:

...

you could elaborate the documenatation “Assumes UTF-8” – I guess this only applies to the two ByteString variants, as String and Text _should_ contain unicode codepoints and no encoding. Not that someone tries to use a String where each Char corresponds to a byte in a UTF-8 encoded string and thinks he can convert it correctly.

Good point. I added a longer comment (in the repo).

...

I was about to suggest to merge this into the convertible package (to fight package proliferation), but found that it seems it is already there: http://hackage.haskell.org/packages/archive/convertible- text/0.4.0.2/doc/html/src/Data-Convertible-Instances-Text.html

I am aware of the Convertible class (and I really like it, btw.). But I wanted to allow for explicit string conversion. Data.Convertible.convert includes conversions with information loss (e.g. Float -> Int), while Data.String.Conversions.convertString (converts only strings and) preserves information in all cases. Cheers, Sönke

Sönke Hahn

3:43 p.m.

New subject: ANNOUNCE: string-conversions-0.2

I've uploaded a new version to hackage incorporating suggestions from Joachim Breitner, Michael Snoyman and (offlist) Matthias Fischmann. The package now supplies (<>), a generic function for string concatenation. (Under ghc >= 7.4 this is a re-export from Data.Monoid to avoid name clashes.) Sönke Sönke Hahn wrote:

...

Hi all!

string-conversions is a very simple package to facilitate dealing with different string types. It provides a simple type class that allows you to convert between values of different string types. It also provides type synonyms for these string types.

Supported types are:

- String - Strict ByteString - Lazy ByteString - Strict Text - Lazy Text

http://hackage.haskell.org/package/string-conversions

Any comments welcome.

Cheers, Sönke

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Joachim Breitner
Michael Snoyman
Sönke Hahn