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• Example-lexer

Whitespace-char-p

Recognize basic whitespace.

Definitions and Theorems

Function: whitespace-char-p

(defun whitespace-char-p (x)
  (declare (xargs :guard t))
  (and (characterp x)
       (or (eql x #\Space)
           (eql x #\Newline)
           (eql x #\Tab))))

Theorem: booleanp-of-whitespace-char-p

(defthm booleanp-of-whitespace-char-p
  (booleanp (whitespace-char-p x))
  :rule-classes :type-prescription)

Theorem: characterp-when-whitespace-char-p

(defthm characterp-when-whitespace-char-p
  (implies (whitespace-char-p x)
           (characterp x))
  :rule-classes :compound-recognizer)

Subtopics

Whitespace-charlist-p

(whitespace-charlist-p x) recognizes lists where every element satisfies whitespace-char-p.

Whitespace-chars

A character set for whitespace-char-p.