:: syntax for namespaced keywords

[ruricolist]

The :: syntax for namespaced keywords does not work, and it does not appear it can be made to work within the limits of the Lisp reader.

Explicitly namespaced keywords still work; it is only the :: shorthand that doesn't work.

Namespaced keywords do not appear to be widely used, however.

[ruricolist]

This can be worked around with Eclector. Proof of concept:

(in-package :serapeum-user)

(defclass namespaced-keyword-client () ())

(defmethod eclector.reader:interpret-token ((client namespaced-keyword-client)
                                            input-stream
                                            token
                                            escape-ranges)
  (let* (namespaced?
         (token
           (handler-bind ((eclector.reader:two-package-markers-must-not-be-first
                            (lambda (e) (declare (ignore e))
                              (setf namespaced? t)
                              (invoke-restart 'eclector.reader:recover))))
             (call-next-method))))
    (if namespaced?
        (intern (string+ (package-name *package*) "/"
                         (symbol-name token))
                :keyword)
        token)))

(let ((eclector.reader:*client* (make 'namespaced-keyword-client)))
  (eclector.reader:read-from-string "::keyword"))

Before electing Eclector, however, I need to be sure it can handle Clojure quasiquotation.