Re: [racket-users] how to `read-char` from port using `latin-1` encoding?

[Matthew Butterick]

OK thanks. Both "latin1" and "iso-8859-1" do work with `reencode-input-port`.



> On Mar 31, 2017, at 1:08 PM, Jon Zeppieri  wrote:
> 
> Try using "iso-8859-1" as the name of the encoding, instead of "latin-1." -J
> 
> 
> On Fri, Mar 31, 2017 at 3:55 PM, Matthew Butterick  wrote:
>> IIUC when `read-char` reads from a port it assumes the port uses UTF-8
>> encoding. [1]
>> 
>> (My Racketuition suggests there might be a parameter called
>> `current-port-encoding` that controls what encoding is applied to the port,
>> but apparently not.)
>> 
>> So instead, one must convert the port explicitly. OK, this seems to work:
>> 
>> (open-input-string (bytes->string/latin-1 (port->bytes port)))
>> 
>> The problem is that I'm reading all the bytes first, which defeats the
>> port-ishness of the operation.
>> 
>> But if I try the promising-sounding `reencode-input-port`:
>> 
>> (reencode-input-port port "latin-1")
>> 
>> This doesn't work, because it relies on `bytes-open-converter`, which
>> apparently doesn't know about `latin-1` encoding (a teeny bit surprising
>> since other racket/base functions deal with this encoding)
>> 
>> Hence the question: is there a smarter way to read characters from a
>> `latin-1` encoded port?
>> 
>> 
>> [1] http://docs.racket-lang.org/reference/encodings.html?q=encoding
>> 
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Re: [racket-users] how to `read-char` from port using `latin-1` encoding?

[Jon Zeppieri]

Try using "iso-8859-1" as the name of the encoding, instead of "latin-1." -J


On Fri, Mar 31, 2017 at 3:55 PM, Matthew Butterick  wrote:
> IIUC when `read-char` reads from a port it assumes the port uses UTF-8
> encoding. [1]
>
> (My Racketuition suggests there might be a parameter called
> `current-port-encoding` that controls what encoding is applied to the port,
> but apparently not.)
>
> So instead, one must convert the port explicitly. OK, this seems to work:
>
> (open-input-string (bytes->string/latin-1 (port->bytes port)))
>
> The problem is that I'm reading all the bytes first, which defeats the
> port-ishness of the operation.
>
> But if I try the promising-sounding `reencode-input-port`:
>
> (reencode-input-port port "latin-1")
>
> This doesn't work, because it relies on `bytes-open-converter`, which
> apparently doesn't know about `latin-1` encoding (a teeny bit surprising
> since other racket/base functions deal with this encoding)
>
> Hence the question: is there a smarter way to read characters from a
> `latin-1` encoded port?
>
>
> [1] http://docs.racket-lang.org/reference/encodings.html?q=encoding
>
> --
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Re: [racket-users] how to `read-char` from port using `latin-1` encoding?

[Matthew Flatt]

Try "latin1" (no hyphen).

I'm not sure of the standard for these names, but probably Racket's `latin-1` 
functions are misnamed.

> On Mar 31, 2017, at 3:55 PM, Matthew Butterick  wrote:
> 
> IIUC when `read-char` reads from a port it assumes the port uses UTF-8 
> encoding. [1] 
> 
> (My Racketuition suggests there might be a parameter called 
> `current-port-encoding` that controls what encoding is applied to the port, 
> but apparently not.)
> 
> So instead, one must convert the port explicitly. OK, this seems to work:
> 
> (open-input-string (bytes->string/latin-1 (port->bytes port)))
> 
> The problem is that I'm reading all the bytes first, which defeats the 
> port-ishness of the operation.
> 
> But if I try the promising-sounding `reencode-input-port`:
> 
> (reencode-input-port port "latin-1")
> 
> This doesn't work, because it relies on `bytes-open-converter`, which 
> apparently doesn't know about `latin-1` encoding (a teeny bit surprising 
> since other racket/base functions deal with this encoding)
> 
> Hence the question: is there a smarter way to read characters from a 
> `latin-1` encoded port?
> 
> 
> [1] http://docs.racket-lang.org/reference/encodings.html?q=encoding
> -- 
> You received this message because you are subscribed to the Google Groups 
> "Racket Users" group.
> To unsubscribe from this group and stop receiving emails from it, send an 
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