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• Parser

Check-token-string

Check if the given token is present and has the given string as fringe.

Signature

(check-token-string string token) → tree

Arguments

string — Guard (stringp string).

token — Guard (abnf::tree-optionp token).

Returns

tree — Type (abnf::tree-resultp tree).

If the check is successful, return the token. Using this function ensures that we get a CST tree or reserr.

Definitions and Theorems

Function: check-token-string

(defun check-token-string (string token)
  (declare (xargs :guard (and (stringp string)
                              (abnf::tree-optionp token))))
  (let ((__function__ 'check-token-string))
    (declare (ignorable __function__))
    (abnf::tree-option-case
         token :some
         (if (token-stringp string token.val)
             token.val
           (reserrf (list :required (str-fix string)
                          :found token.val)))
         :none (reserrf (list :required (str-fix string)
                              :found nil)))))

Theorem: tree-resultp-of-check-token-string

(defthm tree-resultp-of-check-token-string
  (b* ((tree (check-token-string string token)))
    (abnf::tree-resultp tree))
  :rule-classes :rewrite)

Theorem: check-token-string-of-str-fix-string

(defthm check-token-string-of-str-fix-string
  (equal (check-token-string (str-fix string)
                             token)
         (check-token-string string token)))

Theorem: check-token-string-streqv-congruence-on-string

(defthm check-token-string-streqv-congruence-on-string
  (implies (acl2::streqv string string-equiv)
           (equal (check-token-string string token)
                  (check-token-string string-equiv token)))
  :rule-classes :congruence)

Theorem: check-token-string-of-tree-option-fix-token

(defthm check-token-string-of-tree-option-fix-token
  (equal (check-token-string string (abnf::tree-option-fix token))
         (check-token-string string token)))

Theorem: check-token-string-tree-option-equiv-congruence-on-token

(defthm check-token-string-tree-option-equiv-congruence-on-token
  (implies (abnf::tree-option-equiv token token-equiv)
           (equal (check-token-string string token)
                  (check-token-string string token-equiv)))
  :rule-classes :congruence)