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Html-encoding

Html-encode-char-basic

HTML encode a single character (simple version, no tab support).

Signature
(html-encode-char-basic x acc) → new-acc
Arguments: x — Character to encode.
Guard (characterp x).; acc — Accumulator for output characters, reverse order.
Returns: new-acc — Type (character-listp new-acc), given (character-listp acc).

Definitions and Theorems

Function: html-encode-char-basic$inline

(defun html-encode-char-basic$inline (x acc)
  (declare (xargs :guard (characterp x)))
  (declare (type character x))
  (declare (xargs :split-types t))
  (let ((acl2::__function__ 'html-encode-char-basic))
    (declare (ignorable acl2::__function__))
    (b* (((the character x)
          (mbe :logic (char-fix x) :exec x)))
      (case x
        (#\Space (if (or (atom acc)
                         (eql (car acc) #\Space)
                         (eql (car acc) #\Newline))
                     (revappend (html-space) acc)
                   (cons #\Space acc)))
        (#\Newline (revappend (html-newline) acc))
        (#\< (revappend (html-less) acc))
        (#\> (revappend (html-greater) acc))
        (#\& (revappend (html-amp) acc))
        (#\" (revappend (html-quote) acc))
        (otherwise (cons x acc))))))

Theorem: character-listp-of-html-encode-char-basic

(defthm character-listp-of-html-encode-char-basic
  (implies (character-listp acc)
           (b* ((new-acc (html-encode-char-basic$inline x acc)))
             (character-listp new-acc)))
  :rule-classes :rewrite)

Theorem: html-encode-char-basic$inline-of-char-fix-x

(defthm html-encode-char-basic$inline-of-char-fix-x
  (equal (html-encode-char-basic$inline (char-fix x)
                                        acc)
         (html-encode-char-basic$inline x acc)))

Theorem: html-encode-char-basic$inline-chareqv-congruence-on-x

(defthm html-encode-char-basic$inline-chareqv-congruence-on-x
  (implies (chareqv x x-equiv)
           (equal (html-encode-char-basic$inline x acc)
                  (html-encode-char-basic$inline x-equiv acc)))
  :rule-classes :congruence)