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Syntax-abstraction

Abs-simple-character-escape

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

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

Definitions and Theorems

Function: abs-simple-character-escape

(defun abs-simple-character-escape (tree)
 (declare (xargs :guard (abnf::treep tree)))
 (let ((__function__ 'abs-simple-character-escape))
  (declare (ignorable __function__))
  (b*
   (((okf tree)
     (abnf::check-tree-nonleaf-1-1 tree "simple-character-escape"))
    ((okf rulename?)
     (abnf::check-tree-nonleaf? tree)))
   (cond
    ((equal rulename? "double-quote-escape")
     (abs-double-quote-escape tree))
    ((equal rulename? "backslash-escape")
     (abs-backslash-escape tree))
    ((equal rulename? "line-feed-escape")
     (abs-line-feed-escape tree))
    ((equal rulename? "carriage-return-escape")
     (abs-carriage-return-escape tree))
    ((equal rulename? "horizontal-tab-escape")
     (abs-horizontal-tab-escape tree))
    ((equal rulename? "null-character-escape")
     (abs-null-character-escape tree))
    (t
     (reserrf
        (list :found-subtree (abnf::tree-info-for-error tree))))))))

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

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

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

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

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

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