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Syntax-abstraction

Abstract-concatenation

A concatenation parse tree is abstracted to its corresponding concatenation.

Signature
(abstract-concatenation tree) → concatenation
Arguments: tree — Guard (treep tree).
Returns: concatenation — Type (concatenationp concatenation).

Function: abstract-concatenation

(defun abstract-concatenation (tree)
  (declare (xargs :guard (treep tree)))
  (b* (((fun (fail)) (abstract-fail))
       ((unless (tree-case tree :nonleaf))
        (fail))
       (treess (tree-nonleaf->branches tree))
       ((unless (and (consp treess)
                     (consp (cdr treess))))
        (fail))
       (trees-repetition (car treess))
       (trees-repetitions (cadr treess))
       ((unless (consp trees-repetition))
        (fail))
       (tree-repetition (car trees-repetition))
       (repetition (abstract-repetition tree-repetition))
       (repetitions (abstract-conc-rest trees-repetitions)))
    (cons repetition repetitions)))