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Parser

Token-keywordp

Check if a token is a given keyword.

Signature
(token-keywordp token keyword) → yes/no
Arguments: token — Guard (token-optionp token).; keyword — Guard (stringp keyword).
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-keywordp

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

Theorem: booleanp-of-token-keywordp

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

Theorem: non-nil-when-token-keywordp

(defthm non-nil-when-token-keywordp
  (implies (token-keywordp token keyword)
           token)
  :rule-classes :forward-chaining)