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Parse-charset-set

Signature

(parse-charset-set x index) → (mv err char new-index)

Arguments

x — Guard (stringp x).

index — Guard (natp index).

Returns

err — Type (acl2::maybe-stringp err).

char — Type (character-listp char).

new-index — Type (natp new-index).

Definitions and Theorems

Function: parse-charset-set

(defun parse-charset-set (x index)
  (declare (xargs :guard (and (stringp x) (natp index))))
  (declare (xargs :guard (<= index (strlen x))))
  (let ((__function__ 'parse-charset-set))
    (declare (ignorable __function__))
    (b* ((x (lstrfix x))
         (index (lnfix index))
         ((unless (< index (strlen x)))
          (mv "String ended inside charset"
              nil index))
         (char1 (char x index))
         ((unless (eql char1 #\\))
          (mv "No match" nil index))
         (index (+ 1 index))
         ((unless (< index (strlen x)))
          (mv "String ended inside charset"
              nil index))
         (char2 (char x index))
         (index (+ 1 index)))
      (case char2
        (#\w (mv nil
                 (cons #\_
                       (append (charset-range #\a #\z)
                               (charset-range #\A #\Z)
                               (charset-range #\0 #\9)))
                 index))
        (#\d (mv nil (charset-range #\0 #\9) index))
        (#\s (mv nil
                 '(#\Space #\Tab #\Newline #\Page #\Return)
                 index))
        (#\h (mv nil '(#\Space #\Tab) index))
        (#\v (mv nil '(#\Newline #\Page #\Return)
                 index))
        (t (mv (str::cat "Unrecognized escape sequence in charset: "
                         (coerce (list char1 char2) 'string))
               nil index))))))

Theorem: maybe-stringp-of-parse-charset-set.err

(defthm maybe-stringp-of-parse-charset-set.err
  (b* (((mv ?err common-lisp::?char ?new-index)
        (parse-charset-set x index)))
    (acl2::maybe-stringp err))
  :rule-classes :type-prescription)

Theorem: character-listp-of-parse-charset-set.char

(defthm character-listp-of-parse-charset-set.char
  (b* (((mv ?err common-lisp::?char ?new-index)
        (parse-charset-set x index)))
    (character-listp char))
  :rule-classes :rewrite)

Theorem: natp-of-parse-charset-set.new-index

(defthm natp-of-parse-charset-set.new-index
  (b* (((mv ?err common-lisp::?char ?new-index)
        (parse-charset-set x index)))
    (natp new-index))
  :rule-classes :type-prescription)

Theorem: new-index-of-parse-charset-set

(defthm new-index-of-parse-charset-set
  (b* (((mv ?err common-lisp::?char ?new-index)
        (parse-charset-set x index)))
    (<= (nfix index) new-index))
  :rule-classes :linear)

Theorem: new-index-of-parse-charset-set-strong

(defthm new-index-of-parse-charset-set-strong
  (b* (((mv ?err common-lisp::?char ?new-index)
        (parse-charset-set x index)))
    (implies (not err)
             (< (nfix index) new-index)))
  :rule-classes :linear)

Theorem: new-index-of-parse-charset-set-less-than-length

(defthm new-index-of-parse-charset-set-less-than-length
  (b* (((mv ?err common-lisp::?char ?new-index)
        (parse-charset-set x index)))
    (implies (<= (nfix index)
                 (len (acl2::explode x)))
             (<= new-index (len (acl2::explode x)))))
  :rule-classes :linear)

Theorem: parse-charset-set-of-str-fix-x

(defthm parse-charset-set-of-str-fix-x
  (equal (parse-charset-set (acl2::str-fix x)
                            index)
         (parse-charset-set x index)))

Theorem: parse-charset-set-streqv-congruence-on-x

(defthm parse-charset-set-streqv-congruence-on-x
  (implies (acl2::streqv x x-equiv)
           (equal (parse-charset-set x index)
                  (parse-charset-set x-equiv index)))
  :rule-classes :congruence)

Theorem: parse-charset-set-of-nfix-index

(defthm parse-charset-set-of-nfix-index
  (equal (parse-charset-set x (nfix index))
         (parse-charset-set x index)))

Theorem: parse-charset-set-nat-equiv-congruence-on-index

(defthm parse-charset-set-nat-equiv-congruence-on-index
  (implies (acl2::nat-equiv index index-equiv)
           (equal (parse-charset-set x index)
                  (parse-charset-set x index-equiv)))
  :rule-classes :congruence)