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Syntax-abstraction

Abstract-case-sensitive-string

A case-sensitive-string parse tree is abstracted to its character string.

Signature
(abstract-case-sensitive-string tree) → charstring
Arguments: tree — Guard (treep tree).
Returns: charstring — Type (common-lisp::stringp charstring).

Definitions and Theorems

Function: abstract-case-sensitive-string

(defun abstract-case-sensitive-string (tree)
  (declare (xargs :guard (treep tree)))
  (b* (((fun (fail))
        (prog2$ (abstract-fail) ""))
       ((unless (tree-case tree :nonleaf))
        (fail))
       (treess (tree-nonleaf->branches tree))
       ((unless (and (consp treess)
                     (consp (cdr treess))))
        (fail))
       (trees (cadr treess))
       ((unless (consp trees)) (fail))
       (subtree (car trees)))
    (abstract-quoted-string subtree)))

Theorem: stringp-of-abstract-case-sensitive-string

(defthm stringp-of-abstract-case-sensitive-string
  (b* ((charstring (abstract-case-sensitive-string tree)))
    (common-lisp::stringp charstring))
  :rule-classes :rewrite)