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Escape-sequence

Escape-sequence-kind

Get the kind (tag) of a escape-sequence structure.

Signature
(escape-sequence-kind x) → kind
Arguments: x — Guard (escape-sequence-p x).

Definitions and Theorems

Function: escape-sequence-kind$inline

(defun escape-sequence-kind$inline (x)
  (declare (xargs :guard (escape-sequence-p x)))
  (let ((__function__ 'escape-sequence-kind))
    (declare (ignorable __function__))
    (mbe :logic (cond ((or (atom x) (eq (car x) :b)) :b)
                      ((eq (car x) :t) :t)
                      ((eq (car x) :n) :n)
                      ((eq (car x) :f) :f)
                      ((eq (car x) :r) :r)
                      ((eq (car x) :double-quote)
                       :double-quote)
                      ((eq (car x) :single-quote)
                       :single-quote)
                      ((eq (car x) :backslash) :backslash)
                      (t :octal))
         :exec (car x))))

Theorem: escape-sequence-kind-possibilities

(defthm escape-sequence-kind-possibilities
  (or (equal (escape-sequence-kind x) :b)
      (equal (escape-sequence-kind x) :t)
      (equal (escape-sequence-kind x) :n)
      (equal (escape-sequence-kind x) :f)
      (equal (escape-sequence-kind x) :r)
      (equal (escape-sequence-kind x)
             :double-quote)
      (equal (escape-sequence-kind x)
             :single-quote)
      (equal (escape-sequence-kind x)
             :backslash)
      (equal (escape-sequence-kind x) :octal))
  :rule-classes
  ((:forward-chaining :trigger-terms ((escape-sequence-kind x)))))