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• Cases

Upcase-char-str

Convert a character into an upper-case one-element string.

Signature

(upcase-char-str c) → str

Arguments

c — Guard (characterp c).

Returns

str — Type (stringp str).

(upcase-char-str c) is logically equal to:

(implode (list (upcase-char c)))

But we store these strings in a table so that they don't have to be recomputed. This is mainly useful to reduce the creation of temporary strings during upcase-first.

Definitions and Theorems

Function: make-upcase-first-strtbl

(defun make-upcase-first-strtbl (n)
  (declare (xargs :guard (and (natp n) (<= n 255))))
  (cons (cons n
              (implode (list (upcase-char (code-char n)))))
        (if (zp n)
            nil
          (make-upcase-first-strtbl (- n 1)))))

Function: upcase-char-str$inline

(defun upcase-char-str$inline (c)
  (declare (xargs :guard (characterp c)))
  (let ((acl2::__function__ 'upcase-char-str))
    (declare (ignorable acl2::__function__))
    (mbe :logic (implode (list (upcase-char c)))
         :exec (aref1 '*upcase-first-strtbl*
                      *upcase-first-strtbl* (char-code c)))))

Theorem: stringp-of-upcase-char-str

(defthm stringp-of-upcase-char-str
  (b* ((str (upcase-char-str$inline c)))
    (stringp str))
  :rule-classes :type-prescription)