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• Line-and-column-tracking

Lc-nthcdr

Like nthcdr into a character list, but simultaneously computes the new line and column numbers.

Signature

(lc-nthcdr n x line col) → (mv new-chars new-line new-col)

Arguments

n — How many characters to advance.
    Guard (natp n).

x — Characters we're processing.
    Guard (character-listp x).

line — Current line number.
    Guard (natp line).

col — Current column number.
    Guard (natp col).

Returns

new-chars — Remaining characters after advancing.

new-line — Line number after advancing.

new-col — Column number after advancing.

Definitions and Theorems

Function: lc-nthcdr

(defun lc-nthcdr (n x line col)
  (declare (xargs :guard (and (natp n)
                              (character-listp x)
                              (natp line)
                              (natp col))))
  (declare (type (integer 0 *) n line col))
  (let ((__function__ 'lc-nthcdr))
    (declare (ignorable __function__))
    (mbe :logic
         (mv (nthcdr n x)
             (line-after-nthcdr n x line)
             (col-after-nthcdr n x col))
         :exec
         (b* (((when (or (zp n) (atom x)))
               (mv x line col))
              ((the character char1) (car x))
              ((the (integer 0 *) n) (- (lnfix n) 1)))
           (if (eql char1 #\Newline)
               (lc-nthcdr n (cdr x) (+ 1 line) 0)
             (lc-nthcdr n (cdr x)
                        line (+ 1 col)))))))