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Syntax-abstraction

Abs-backslash-escape

Abstract a backslash-escape to a Leo character.

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

Definitions and Theorems

Function: abs-backslash-escape

(defun abs-backslash-escape (tree)
  (declare (xargs :guard (abnf::treep tree)))
  (let ((__function__ 'abs-backslash-escape))
    (declare (ignorable __function__))
    (b* (((okf tree)
          (abnf::check-tree-nonleaf-1-1 tree "backslash-escape"))
         ((okf &)
          (abnf::check-tree-ichars tree "\\\\")))
      (char (char-code #\\)))))

Theorem: char-resultp-of-abs-backslash-escape

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

Theorem: abs-backslash-escape-of-tree-fix-tree

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

Theorem: abs-backslash-escape-tree-equiv-congruence-on-tree

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