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• Vl-read-file

Vl-read-file-loop

Logically nice loop for vl-read-file.

Signature

(vl-read-file-loop channel filename line col &key (state 'state)) 
  → 
(mv data state)

Arguments

channel — Channel we're reading from.
    Guard (symbolp channel).

filename — Current file name.
    Guard (stringp filename).

line — Current line number.
    Guard (posp line).

col — Current column number.
    Guard (natp col).

Returns

data — Characters from the file.
    Type (vl-echarlist-p data), given the guard.

state — Type (state-p1 state), given the guard.

Definitions and Theorems

Function: vl-read-file-loop-fn

(defun vl-read-file-loop-fn (channel filename line col state)
 (declare (xargs :stobjs (state)))
 (declare (xargs :guard (and (symbolp channel)
                             (stringp filename)
                             (posp line)
                             (natp col))))
 (declare (xargs :guard (open-input-channel-p channel
                                              :byte state)))
 (let ((__function__ 'vl-read-file-loop))
  (declare (ignorable __function__))
  (mbe
   :logic
   (b* (((unless (state-p state))
         (mv nil state))
        ((mv byte state)
         (read-byte$ channel state))
        ((unless byte) (mv nil state))
        (char (code-char (the (unsigned-byte 8) byte)))
        (echar (make-vl-echar-fast :char char
                                   :filename filename
                                   :line line
                                   :col col))
        (newlinep (eql char #\Newline))
        (next-line (if newlinep (+ 1 line) line))
        (next-col (if newlinep 0 (+ 1 col)))
        ((mv rest state)
         (vl-read-file-loop channel filename next-line next-col)))
     (mv (cons echar rest) state))
   :exec
   (with-local-stobj
     nrev
     (mv-let
       (echars nrev state)
       (b* (((mv nrev state)
             (vl-read-file-loop-aux channel filename line col nrev))
            ((mv echars nrev) (nrev-finish nrev)))
         (mv echars nrev state))
       (mv echars state))))))

Theorem: vl-echarlist-p-of-vl-read-file-loop.data

(defthm vl-echarlist-p-of-vl-read-file-loop.data
 (implies
      (and (force (state-p state))
           (force (symbolp channel))
           (force (stringp filename))
           (force (posp line))
           (force (natp col))
           (force (open-input-channel-p channel ':byte
                                        state)))
      (b* (((mv ?data acl2::?state)
            (vl-read-file-loop-fn channel filename line col state)))
        (vl-echarlist-p data)))
 :rule-classes :rewrite)

Theorem: state-p1-of-vl-read-file-loop.state

(defthm state-p1-of-vl-read-file-loop.state
 (implies
      (and (force (state-p state))
           (force (symbolp channel))
           (force (stringp filename))
           (force (posp line))
           (force (natp col))
           (force (open-input-channel-p channel ':byte
                                        state)))
      (b* (((mv ?data acl2::?state)
            (vl-read-file-loop-fn channel filename line col state)))
        (state-p1 state)))
 :rule-classes :rewrite)

Theorem: true-listp-of-vl-read-file-loop

(defthm true-listp-of-vl-read-file-loop
 (true-listp (mv-nth 0
                     (vl-read-file-loop channel filename line col)))
 :rule-classes :type-prescription)

Theorem: vl-read-file-loop-aux-redef

(defthm vl-read-file-loop-aux-redef
  (equal (vl-read-file-loop-aux channel filename line col acc)
         (b* (((mv data state)
               (vl-read-file-loop channel filename line col)))
           (mv (append acc data) state))))

Theorem: vl-read-file-loop-preserves-open-input-channel-p1

(defthm vl-read-file-loop-preserves-open-input-channel-p1
  (implies (and (force (state-p1 state))
                (force (symbolp channel))
                (force (open-input-channel-p1 channel
                                              :byte state)))
           (b* (((mv ?data state)
                 (vl-read-file-loop channel filename line col)))
             (open-input-channel-p1 channel
                                    :byte state))))