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Syntax-abstraction

Abs-unicode-character-escape

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

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

Definitions and Theorems

Function: abs-unicode-character-escape

(defun abs-unicode-character-escape (tree)
 (declare (xargs :guard (abnf::treep tree)))
 (let ((__function__ 'abs-unicode-character-escape))
   (declare (ignorable __function__))
   (b*
     (((okf (abnf::tree-list-tuple3 sub))
       (abnf::check-tree-nonleaf-3 tree "unicode-character-escape"))
      ((okf u-tree)
       (abnf::check-tree-list-1 sub.1st))
      ((okf &)
       (abnf::check-tree-schars u-tree "\\u{"))
      ((unless (and (<= 1 (len sub.2nd))
                    (<= (len sub.2nd) 6)))
       (reserrf (list :found-hex-digits (len sub.2nd))))
      ((okf nat)
       (abs-*-hexadecimal-digit-to-nat sub.2nd))
      ((unless (<= nat 1114111))
       (reserrf (list :bad-code-point nat)))
      ((okf cb-tree)
       (abnf::check-tree-list-1 sub.3rd))
      ((okf &)
       (abnf::check-tree-schars cb-tree "}")))
     (char nat))))

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

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

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

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

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

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