Re: Console reader?

On May 23, 2005, at 2:35 AM, Dawid Weiss wrote:

> A student of mine asked why Console.getIn() returns a Reader  
> instance that emits Java-encoded character sequences (unicode  
> \uxxxx) and I honestly didn't have any idea (an output stream I'd  
> understand, but a Reader?). What's the purpose of this and what's  
> the correct way to decode the stream (I advised to use  
> bsh.JavaCharStream to decode it, but I am still curious about this  
> design rationale).

Well, the console interface is what the Interpreter uses to talk to  
the outside world.  Having it return a reader for input to the  
interpreter/parser abstracts us from the encoding.  The  
JavaCharStream Reader is generated by the JavaCC parser generator and  
used internally by the parser...  In our code we simply supply a  
plain Reader.

I'm not entirely sure why JavaCC needs to escape the unicode  
sequences for its own purposes.  This came about when they switched  
from a byte stream to a Reader a long time ago.


Pat


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