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• Lexer

Read-punctuator

Read a specific punctuator token.

Signature

(read-punctuator punct parstate) → (mv erp span new-parstate)

Arguments

punct — Guard (stringp punct).

parstate — Guard (parstatep parstate).

Returns

span — Type (spanp span).

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

This is called when we expect a specific punctuator. We pass the string for the punctuator, and we read the next token, ensuring it exists and it is that punctuator.

Definitions and Theorems

Function: read-punctuator

(defun read-punctuator (punct parstate)
  (declare (xargs :stobjs (parstate)))
  (declare (xargs :guard (and (stringp punct)
                              (parstatep parstate))))
  (let ((__function__ 'read-punctuator))
    (declare (ignorable __function__))
    (b* (((reterr) (irr-span) parstate)
         ((erp token span parstate)
          (read-token parstate))
         ((unless (token-punctuatorp token punct))
          (reterr-msg :where (position-to-msg (span->start span))
                      :expected (msg "the punctuator ~x0" punct)
                      :found (token-to-msg token))))
      (retok span parstate))))

Theorem: spanp-of-read-punctuator.span

(defthm spanp-of-read-punctuator.span
  (b* (((mv acl2::?erp ?span ?new-parstate)
        (read-punctuator punct parstate)))
    (spanp span))
  :rule-classes :rewrite)

Theorem: parstatep-of-read-punctuator.new-parstate

(defthm parstatep-of-read-punctuator.new-parstate
  (implies (parstatep parstate)
           (b* (((mv acl2::?erp ?span ?new-parstate)
                 (read-punctuator punct parstate)))
             (parstatep new-parstate)))
  :rule-classes :rewrite)

Theorem: parsize-of-read-punctuator-uncond

(defthm parsize-of-read-punctuator-uncond
  (b* (((mv acl2::?erp ?span ?new-parstate)
        (read-punctuator punct parstate)))
    (<= (parsize new-parstate)
        (parsize parstate)))
  :rule-classes :linear)

Theorem: parsize-of-read-punctuator-cond

(defthm parsize-of-read-punctuator-cond
  (b* (((mv acl2::?erp ?span ?new-parstate)
        (read-punctuator punct parstate)))
    (implies (not erp)
             (<= (parsize new-parstate)
                 (1- (parsize parstate)))))
  :rule-classes :linear)