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• Parser

Read-identifier

Read an identifier token.

Signature

(read-identifier parstate) → (mv erp ident span new-parstate)

Arguments

parstate — Guard (parstatep parstate).

Returns

ident — Type (identp ident).

span — Type (spanp span).

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

This is called when we expect an identifier token. We read the next token, ensuring it exists and is an identifier. We return the identifier if successful.

Definitions and Theorems

Function: read-identifier

(defun read-identifier (parstate)
  (declare (xargs :stobjs (parstate)))
  (declare (xargs :guard (parstatep parstate)))
  (let ((__function__ 'read-identifier))
    (declare (ignorable __function__))
    (b* (((reterr)
          (irr-ident)
          (irr-span)
          parstate)
         ((erp token span parstate)
          (read-token parstate))
         ((unless (and token (token-case token :ident)))
          (reterr-msg :where (position-to-msg (span->start span))
                      :expected "an identifier"
                      :found (token-to-msg token)))
         (ident (token-ident->unwrap token)))
      (retok ident span parstate))))

Theorem: identp-of-read-identifier.ident

(defthm identp-of-read-identifier.ident
  (b* (((mv acl2::?erp ?ident ?span ?new-parstate)
        (read-identifier parstate)))
    (identp ident))
  :rule-classes :rewrite)

Theorem: spanp-of-read-identifier.span

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

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

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

Theorem: parsize-of-read-ident-uncond

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

Theorem: parsize-of-read-ident-cond

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