Re: [Haskell-cafe] Is there already a lib to parse a line of string with a pattern and generate key-value map or a record?

scanf looks interesting. Closer to my case. Thanks. Neil, the formation looks OK in GMail. The lib gives me some other thoughts. Thanks. On Wed, Apr 17, 2019 at 11:24 PM Frank Dedden wrote:

I think you're looking for a scanf (well known in C) like function. A quick search give me: https://hackage.haskell.org/package/scanf https://hackage.haskell.org/package/xformat

I haven't used either of them, so I can't recommend one.

Regards, Frank Dedden

On Wed, Apr 17, 2019 at 10:32:07PM +0800, Magicloud Magiclouds wrote:

...

Thanks. I am familiar with this kind of usage (attoparsec). But it is still somehow complex and not flexible.

Let me see what Frame can do.

On Wed, Apr 17, 2019 at 9:46 PM Станислав Черничкин wrote:

...

I think specific formats can be parsed with attoparsec (Data.Attoparsec.Text):

p = do year <- yearP char '/' month <- monthP char '/' .... return (year, month, ...)

You may also use cassava to parse csv-like files, or Frames for type-safe parsing. With Frames you may custom readers ( http://acowley.github.io/Frames/#orgfa57664 ) with complex pattern-matching, this will require typing skills though.

ср, 17 апр. 2019 г. в 12:30, Magicloud Magiclouds :

...

Hi,

I saw this function in some web tools, pretty useful when parsing log or so. So I wonder if Haskell has similar libs already.

Sample:

Input line: "2019/04/17 17:27 User magicloud runs command ls."

Pattern: "${year}/${month}/${day} ${hour}:${minute} User ${username} runs command ${command}."

Output: toList [ ("year", "2019"), ("month", "04") , etc ]

-- 竹密岂妨流水过 山高哪阻野云飞

And for G+, please use magiclouds#gmail.com. _______________________________________________ Haskell-Cafe mailing list To (un)subscribe, modify options or view archives go to: http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe Only members subscribed via the mailman list are allowed to post.

-- Sincerely, Stanislav Chernichkin.

-- 竹密岂妨流水过 山高哪阻野云飞

And for G+, please use magiclouds#gmail.com. _______________________________________________ Haskell-Cafe mailing list To (un)subscribe, modify options or view archives go to: http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe Only members subscribed via the mailman list are allowed to post.

-- 竹密岂妨流水过 山高哪阻野云飞 And for G+, please use magiclouds#gmail.com.