[phobos] Transcoded text stdio

[SHOO]

I like #4.

I think we should start specifications development of the interface of
new D's I/O.


2010/8/6 Shin Fujishiro <rsinfu at gmail.com>:
> Hello,
>
> I'm trying to integrate codeset conversion facility to std.stdio.
> But how can it be done?
>
> Mixing transcoded and non-transcoded (UTF-8) I/O in the same File
> structure will mess up the source.  I think separating UTF-8 based I/O
> and transcoded I/O is necessary.
>
> I could think of the following four ways.
>
> 1.  Integrate everything in the File anyway.
>
> 2.  Make the File to always perform conversion.
>
> 3.  Create a distinct type for transcoded I/O.
> ----------
>    shared TranscodedFile stdout;
>    stdout.writeln("Hallå, Värld!");
> ----------
> # http://github.com/sinfu/misc/blob/master/stdio/test01.d
>
> 4.  Simplify the File and define upper layer structures.
> ----------
>    // File itself doesn't provide byLine etc.
>    shared File stdout;
>
>    // these 'ports' perform actual I/O for specific purposes
>    shared UTF8TextIOPort stdoutUTF8;
>    shared NativeTextIOPort stdoutText;
>    shared BinaryIOPort stdoutBin;
>
>    // wrap stdout with various 'I/O ports'
>    stdoutUTF8 = UTF8TextIOPort(stdout);
>    stdoutText = NativeTextIOPort(stdout);
>    stdoutBin = BinaryIOPort(stdout);
>
>    // write text in UTF-8
>    stdoutUTF8.writeln("Hallå, Värld!");
>
>    // write text in console encoding
>    stdoutText.writeln("Hallå, Värld!");
>
>    // free functions use stdoutText
>    writeln("Hallå, Värld!");
> ----------
> # http://github.com/sinfu/misc/blob/master/stdio/test02.d
>
> ...
>
> I'm uncertain of which is the best.  Perhaps there are more reasonable
> ways.  What do you think?  Any ideas?
>
>
> Thanks,
> Shin
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