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Escape

Escape-kind

Get the kind (tag) of a escape structure.

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

Definitions and Theorems

Function: escape-kind$inline

(defun escape-kind$inline (x)
  (declare (xargs :guard (escapep x)))
  (let ((__function__ 'escape-kind))
    (declare (ignorable __function__))
    (mbe :logic (cond ((or (atom x) (eq (car x) :single-quote))
                       :single-quote)
                      ((eq (car x) :double-quote)
                       :double-quote)
                      ((eq (car x) :backslash) :backslash)
                      ((eq (car x) :letter-n) :letter-n)
                      ((eq (car x) :letter-r) :letter-r)
                      ((eq (car x) :letter-t) :letter-t)
                      ((eq (car x) :line-feed) :line-feed)
                      ((eq (car x) :carriage-return)
                       :carriage-return)
                      ((eq (car x) :x) :x)
                      (t :u))
         :exec (car x))))

Theorem: escape-kind-possibilities

(defthm escape-kind-possibilities
  (or (equal (escape-kind x) :single-quote)
      (equal (escape-kind x) :double-quote)
      (equal (escape-kind x) :backslash)
      (equal (escape-kind x) :letter-n)
      (equal (escape-kind x) :letter-r)
      (equal (escape-kind x) :letter-t)
      (equal (escape-kind x) :line-feed)
      (equal (escape-kind x) :carriage-return)
      (equal (escape-kind x) :x)
      (equal (escape-kind x) :u))
  :rule-classes
  ((:forward-chaining :trigger-terms ((escape-kind x)))))