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• Parser

Position-inc-line

Increment a position by a number of lines.

Signature

(position-inc-line lines pos) → new-pos

Arguments

lines — Guard (posp lines).

pos — Guard (positionp pos).

Returns

new-pos — Type (positionp new-pos).

The column is reset to 0.

Definitions and Theorems

Function: position-inc-line

(defun position-inc-line (lines pos)
  (declare (xargs :guard (and (posp lines) (positionp pos))))
  (let ((__function__ 'position-inc-line))
    (declare (ignorable __function__))
    (make-position :line (+ (position->line pos) lines)
                   :column 0)))

Theorem: positionp-of-position-inc-line

(defthm positionp-of-position-inc-line
  (b* ((new-pos (position-inc-line lines pos)))
    (positionp new-pos))
  :rule-classes :rewrite)