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Today's Topics:
1. hGetContents and modules architecture idea (PY)
----------------------------------------------------------------------
Message: 1
Date: Fri, 5 May 2017 12:31:42 +0300
From: PY <aqua...@gmail.com>
To: beginners@haskell.org
Subject: [Haskell-beginners] hGetContents and modules architecture
idea
Message-ID: <4fb2cb71-d68d-7d93-ce1b-09dc69fac...@gmail.com>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Hello everyone! I'm trying to understand base idea of Haskell modules
architecture. In other languages, "reading from file" is placed in
something like "io", "istream", "file", etc modules. Also most languages
have a concept of reading from abstract bytes streams. You read bytes
from something and translate them into your high level object/type/etc.
In Haskell I see that, for example, function *hGetContents* exists in
(this is my local installation):
* GHC.IO.Handle
* System.IO
* Data.ByteString
* Data.ByteString.Char8
* Data.ByteString.Lazy
* Data.ByteString.Lazy.Char8
* Data.Text.IO
* Data.Text.Lazy.IO
* System.IO.Strict
* Text.Pandoc.UTF8
* Data.ListLike
* Data.ListLike.IO
* ClassyPrelude
* Hledger.Utils.UTF8IOCompat
* Data.IOData
* Darcs.Util.Ratified
* Sound.File.Sndfile
* Sound.File.Sndfile.Buffer
* Data.String.Class
* Network.BufferType
If I'll create module SuperMegaShapes with some Triangle, Rectangle,
Square and other things, I'll create (to be consistent with
Haskell-way)... hGetContents there??!
So, I have 2 questions here:
First one: let's imagine that we have Haskell compiler for embedded. And
I want to read Text, ByteString, Sndfile and SuperMegaShapes from...
SPI. There are many devices andprotocols, right? And I have not FILE
HADNLER for most of them. So, this mean that Haskell (like simple script
language) supports only concept of FILE HANDLER reading?! And no other
ABSTRACTIONS?
Second question is: must any new type which we plan to read/write to
have hGetContents? What if it is packed in some tricky container?
Matreshka? Something else, more tricky? :) And more: what other I/O
functions must be injected in our model definitions modules?
===
Best regards
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