[slime-devel] broken clojure REPL

[Terje Norderhaug]

A main reason for swank messages to encode some symbols as strings  
has been differences in how lisps escape characters in symbols. I  
suggest we formalize the symbol syntax in such a way that we no  
longer have to encode symbols as strings in swank messages. Just  
agreeing on using a backslash will do.

On Jan 10, 2010, at 12:15 AM, Helmut Eller wrote:
> * Terje Norderhaug [2010-01-09 22:52+0100] writes:
>> Now that there are multiple clients and servers, I think it is time
>> that we formalize the lisp syntax of the messages in the swank
>> protocol. It should be simple, limited to a subset of what is allowed
>> by Common Lisp... something parseable with say less than a page of
>> lisp code.
>
> Here's a one page reader:
>
> (defun simple-read ()
>   (let ((c (read-char)))
>     (case c
>       (#\" (with-output-to-string (*standard-output*)
>              (loop for c = (read-char) do
>                    (case c
>                      (#\" (return))
>                      (#\\ (write-char (read-char)))
>                      (t (write-char c))))))
>       (#\( (loop collect (simple-read)
>                  while (ecase (read-char)
>                          (#\) nil)
>                          (#\space t))))
>       (#\' `(quote ,(simple-read)))
>       (t (let ((string (with-output-to-string (*standard-output*)
>                          (loop for ch = c then (read-char nil nil) do
>                                (case ch
>                                  ((nil)  (return))
>                                  ((#\space #\)) (unread-char ch)  
> (return))
>                                  (t (write-char ch)))))))
>            (cond ((digit-char-p (aref string 0)) (parse-integer  
> string))
>                  ((intern string))))))))

-- Terje Norderhaug
   terje at in-progress.com