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        • *url-encode-array*
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• Url-encoding

Url-encode-string-aux

Efficiently way to URL encode a string, in reverse order, without exploding it.

Signature

(url-encode-string-aux x n xl acc) → *

Arguments

x — Guard (stringp x).

n — Guard (natp n).

xl — Guard (eql xl (length x)).

This has such a nice logical definition that we just leave it enabled.

Definitions and Theorems

Function: url-encode-string-aux

(defun url-encode-string-aux (x n xl acc)
  (declare (xargs :guard (and (stringp x)
                              (natp n)
                              (eql xl (length x)))))
  (declare (xargs :guard (<= n xl)))
  (let ((acl2::__function__ 'url-encode-string-aux))
    (declare (ignorable acl2::__function__))
    (mbe :logic
         (url-encode-chars-aux (nthcdr n (explode x))
                               acc)
         :exec
         (b* (((when (mbe :logic (zp (- (nfix xl) (nfix n)))
                          :exec (eql n xl)))
               acc)
              (char (char x n))
              (encoding (fast-url-encode-char char))
              (acc (revappend encoding acc)))
           (url-encode-string-aux x (+ 1 (lnfix n))
                                  xl acc)))))