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Syntax-abstraction

Abs-null-character-escape

Abstract a null-character-escape to a Leo character.

Signature
(abs-null-character-escape tree) → char
Arguments: tree — Guard (abnf::treep tree).
Returns: char — Type (char-resultp char).

Definitions and Theorems

Function: abs-null-character-escape

(defun abs-null-character-escape (tree)
 (declare (xargs :guard (abnf::treep tree)))
 (let ((__function__ 'abs-null-character-escape))
  (declare (ignorable __function__))
  (b* (((okf tree)
        (abnf::check-tree-nonleaf-1-1 tree "null-character-escape"))
       ((okf &)
        (abnf::check-tree-schars tree "\\0")))
    (char 0))))

Theorem: char-resultp-of-abs-null-character-escape

(defthm char-resultp-of-abs-null-character-escape
  (b* ((char (abs-null-character-escape tree)))
    (char-resultp char))
  :rule-classes :rewrite)

Theorem: abs-null-character-escape-of-tree-fix-tree

(defthm abs-null-character-escape-of-tree-fix-tree
  (equal (abs-null-character-escape (abnf::tree-fix tree))
         (abs-null-character-escape tree)))

Theorem: abs-null-character-escape-tree-equiv-congruence-on-tree

(defthm abs-null-character-escape-tree-equiv-congruence-on-tree
  (implies (abnf::tree-equiv tree tree-equiv)
           (equal (abs-null-character-escape tree)
                  (abs-null-character-escape tree-equiv)))
  :rule-classes :congruence)