• Top
  • Documentation
  • Books
  • Recursion-and-induction
  • Boolean-reasoning
  • Debugging
  • Projects
  • Std
    • Std/lists
    • Std/alists
    • Obags
    • Std/util
    • Std/strings
      • Pretty-printing
      • Printtree
      • Base64
      • Charset-p
      • Strtok!
      • Cases
      • Concatenation
      • Html-encoding
        • Html-encode-string-aux
        • Html-encode-chars-aux
        • Html-encode-push
        • Html-encode-string-basic-aux
        • Html-encode-string
        • Html-encode-char-basic
        • Html-encode-chars-basic-aux
        • Html-encode-string-basic
      • Character-kinds
      • Substrings
      • Strtok
      • Equivalences
      • Url-encoding
      • Lines
      • Ordering
      • Numbers
      • Pad-trim
      • Coercion
      • Std/strings-extensions
      • Std/strings/digit-to-char
      • Substitution
      • Symbols
    • Std/io
    • Std/osets
    • Std/system
    • Std/basic
    • Std/typed-lists
    • Std/bitsets
    • Std/testing
    • Std/typed-alists
    • Std/stobjs
    • Std-extensions
  • Proof-automation
  • Macro-libraries
  • ACL2
  • Interfacing-tools
  • Hardware-verification
  • Software-verification
  • Testing-utilities
  • Math

• 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)