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• Parser

Parse-*-increment/decrement

Parse zero or more increment and decrement operators.

Signature

(parse-*-increment/decrement parstate) 
  → 
(mv erp ops new-parstate)

Arguments

parstate — Guard (parstatep parstate).

Returns

ops — Type (inc/dec-op-listp ops).

new-parstate — Type (parstatep new-parstate), given (parstatep parstate).

This is used to handle possibly ambiguous cast expressions. We never need the spans of these operators, so this function returns no span.

Definitions and Theorems

Function: parse-*-increment/decrement

(defun parse-*-increment/decrement (parstate)
  (declare (xargs :stobjs (parstate)))
  (declare (xargs :guard (parstatep parstate)))
  (let ((__function__ 'parse-*-increment/decrement))
    (declare (ignorable __function__))
    (b* (((reterr) nil parstate)
         ((erp token & parstate)
          (read-token parstate))
         ((when (token-punctuatorp token "++"))
          (b* (((erp ops parstate)
                (parse-*-increment/decrement parstate)))
            (retok (cons (inc/dec-op-inc) ops)
                   parstate)))
         ((when (token-punctuatorp token "--"))
          (b* (((erp ops parstate)
                (parse-*-increment/decrement parstate)))
            (retok (cons (inc/dec-op-dec) ops)
                   parstate)))
         (parstate (if token (unread-token parstate)
                     parstate)))
      (retok nil parstate))))

Theorem: inc/dec-op-listp-of-parse-*-increment/decrement.ops

(defthm inc/dec-op-listp-of-parse-*-increment/decrement.ops
  (b* (((mv acl2::?erp ?ops ?new-parstate)
        (parse-*-increment/decrement parstate)))
    (inc/dec-op-listp ops))
  :rule-classes :rewrite)

Theorem: parstatep-of-parse-*-increment/decrement.new-parstate

(defthm parstatep-of-parse-*-increment/decrement.new-parstate
  (implies (parstatep parstate)
           (b* (((mv acl2::?erp ?ops ?new-parstate)
                 (parse-*-increment/decrement parstate)))
             (parstatep new-parstate)))
  :rule-classes :rewrite)

Theorem: parsize-of-parse-*-increment/decrement

(defthm parsize-of-parse-*-increment/decrement
  (b* (((mv acl2::?erp ?ops ?new-parstate)
        (parse-*-increment/decrement parstate)))
    (<= (parsize new-parstate)
        (parsize parstate)))
  :rule-classes :linear)