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Sin$c

Sin$c-cdr

Concrete implementation of strin-cdr.

Signature
(sin$c-cdr sin$c) → sin$c
Arguments: sin$c — Guard (sin$c-okp sin$c).

This is not very efficient. It's better to use sin$c-nthcdr than to use this in a loop.

Definitions and Theorems

Function: sin$c-cdr

(defun sin$c-cdr (sin$c)
  (declare (xargs :stobjs (sin$c)))
  (declare (xargs :guard (sin$c-okp sin$c)))
  (let ((__function__ 'sin$c-cdr))
    (declare (ignorable __function__))
    (b* (((the string str) (sin$c-str sin$c))
         ((the (unsigned-byte 60) pos)
          (sin$c-pos sin$c))
         ((the (unsigned-byte 60) len)
          (length str))
         ((when (eql pos len)) sin$c)
         ((the character char1) (char str pos))
         ((the (unsigned-byte 60) pos)
          (+ 1 pos)))
      (if (eql char1 #\Newline)
          (b* (((the (unsigned-byte 60) line)
                (sin$c-line sin$c))
               ((the (unsigned-byte 60) line)
                (+ 1 line))
               (sin$c (update-sin$c-col 0 sin$c))
               (sin$c (update-sin$c-line line sin$c)))
            (update-sin$c-pos pos sin$c))
        (b* (((the (unsigned-byte 60) col)
              (sin$c-col sin$c))
             ((the (unsigned-byte 60) col) (+ 1 col))
             (sin$c (update-sin$c-col col sin$c)))
          (update-sin$c-pos pos sin$c))))))

Theorem: sin-cdr{correspondence}

(defthm sin-cdr{correspondence}
  (implies (and (sin$corr sin$c sin) (strin-p sin))
           (sin$corr (sin$c-cdr sin$c)
                     (strin-cdr sin))))