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portable way to handle extra right parentheses reader error? #356

alanruttenberg opened this Issue Oct 30, 2016 · 0 comments


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alanruttenberg commented Oct 30, 2016

I hate having it throw an exception. I didn't see how to manage that other than in swank.lisp eval-region. Unfortunately it breaks the backend separation. Can someone suggest a better way of doing this?

(defun eval-region (string)
  "Evaluate STRING.
Return the results of the last form as a list and as secondary value the 
last form."
  (with-input-from-string (stream string)
    (let (- values)
    (handler-bind (#+abcl(reader-error
             (lambda (condition)
               (if (equal (slot-value condition 'sys::format-control)
                      "Unmatched right parenthesis.")
                                 ;; this has got to be the most irritating way to get into the debugger.
                                 ;; stop it.
                                 (warn "ignoring extra right parenthesis")
                                 (return-from eval-region (values values -)))
                   (error condition)))))
      (let ((form (read stream nil stream)))
        (when (eq form stream)
          (return (values values -)))
        (setq - form)
        (setq values (multiple-value-list (eval form)))
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