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• Parser

Token-punctuatorp

Check if a token is a given punctuator.

Signature

(token-punctuatorp token punctuator) → yes/no

Arguments

token — Guard (token-optionp token).

punctuator — Guard (stringp punctuator).

Returns

yes/no — Type (booleanp yes/no).

This operates on an optional token, since we normally call this function on an optional token.

Definitions and Theorems

Function: token-punctuatorp

(defun token-punctuatorp (token punctuator)
  (declare (xargs :guard (and (token-optionp token)
                              (stringp punctuator))))
  (let ((__function__ 'token-punctuatorp))
    (declare (ignorable __function__))
    (and token (token-case token :punctuator)
         (equal (token-punctuator->unwrap token)
                punctuator))))

Theorem: booleanp-of-token-punctuatorp

(defthm booleanp-of-token-punctuatorp
  (b* ((yes/no (token-punctuatorp token punctuator)))
    (booleanp yes/no))
  :rule-classes :rewrite)

Theorem: non-nil-when-token-punctuatorp

(defthm non-nil-when-token-punctuatorp
  (implies (token-punctuatorp token punctuator)
           token)
  :rule-classes :forward-chaining)