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; The following comment line tells the build system that if *acl2-exports*
; changes, then every book that uses this file should be recertified:
; (depends-on "build/acl2-exports.certdep" :dir :system)
;; ===================================================================
; We want a custom package because I'm stubborn and want the symbols read-line,
; parse-natural1, parse-natural, and parse-integer.
(defpkg "PROOF-PARSER-ITP13"
(set-difference-eq (union-eq *acl2-exports*
*common-lisp-symbols-from-main-lisp-package*
'(b*))
'(read-line
parse-natural1
parse-natural
parse-integer)))
(in-package "PROOF-PARSER-ITP13")
(include-book "tools/bstar" :dir :system)
(program)
(defttag t)
(remove-untouchable acl2::create-state t)
(set-state-ok t)
;; ========================== Line Readers ===========================
; (channel state) -> (mv bool:eof [char]:char-list state)
(defun read-line (channel state)
(mv-let (char state)
(read-char$ channel state)
(case char
('nil (mv t nil state)) ; EOF
(#\Newline (mv nil (list #\Newline) state))
(otherwise
(mv-let (eof char-list state)
(read-line channel state)
(mv eof (cons char char-list) state))))))
; (channel state) -> (mv bool:eof state)
(defun skip-line (channel state)
(mv-let (eof char-list state)
(read-line channel state)
(declare (ignore char-list))
(mv eof state)))
;; ; (channel state) -> (mv bool:eof [char]:char-list state)
;; (defun read-line (channel state)
;; (b*
;; (((mv char state) (read-char$ channel state))
;; ((if (equal char nil)) (mv t nil state)) ; EOF
;; ((if (equal char #\Newline) (mv nil (list #\Newline) state)))
;; ((mv eof char-list state) (read-line channel state)))
;; (mv eof (cons char char-list) state)))
;; ; (channel state) -> (mv bool:eof state)
;; (defun skip-line (channel state)
;; (b*
;; (((mv eof & state) (read-line channel state)))
;; (mv eof state)))
;; ======================== Whitespace Parser ========================
; ([char]:char-list) -> [char]:char-list
(defun trim-leading-whitespace (char-list)
(if (atom char-list)
nil
(case (car char-list)
((#\Space #\Newline #\Tab) (trim-leading-whitespace (cdr char-list)))
(otherwise
(let ((ascii-code (char-code (car char-list))))
(if (and (<= 33 ascii-code)
(<= ascii-code 126))
char-list
'unknown-char-code-in-trim-leading-whitespace))))))
;; ========================= Number Parsers ==========================
; (char:char) -> char(0-9/nil):digit
(defun char-to-number (char)
(let ((char (- (char-code char) 48)))
(if (and (<= 0 char)
(<= char 9))
char
nil)))
; ([char]:char-list) -> (mv natural:num natural:exp [char]:char-list)
(defun parse-natural1 (char-list)
(if (atom char-list)
(mv 0 0 nil)
(let ((digit (char-to-number (car char-list))))
(if digit
(mv-let (num exp char-list)
(parse-natural1 (cdr char-list))
(mv (+ (* digit (expt 10 exp)) num) (1+ exp) char-list))
(mv 0 0 char-list)))))
; ([char]:char-list) -> (mv bool:fail natural:num [char]:char-list)
(defun parse-natural (char-list)
(cond
((atom char-list) (mv t 0 char-list))
((not (char-to-number (car char-list))) (mv t 0 char-list))
(t
(mv-let (num exp char-list)
(parse-natural1 char-list)
(declare (ignore exp))
(mv nil num char-list)))))
; ([char]:char-list) -> (mv bool:fail integer:num [char]:char-list)
(defun parse-integer (char-list)
(if (atom char-list)
(mv t 0 char-list)
(let* ((signp (equal (car char-list) #\-))
(sign-mult (if signp -1 1))
(char-list (if signp (cdr char-list) char-list)))
(mv-let (fail num new-char-list)
(parse-natural char-list)
(if fail
(mv t 0 new-char-list)
(mv nil (* sign-mult num) new-char-list))))))
;; ========================= String Checker ==========================
; ([char]:char-list string:string) -> (mv bool:fail [char]:char-list)
(defun check-string (char-list string)
(if (atom char-list)
(mv t nil)
(if (<= (length string) 0)
(mv nil char-list)
(if (equal (car char-list)
(char string 0))
(check-string (cdr char-list)
(coerce (cdr (coerce string 'list)) 'string))
(mv t nil)))))
;; ======================== Meta-Info Parser =========================
; ([char]:char-list) -> (mv bool:fail
; integer:num-vars
; integer:num-clauses)
(defun parse-meta-info (char-list)
(b*
((char-list (trim-leading-whitespace char-list))
((mv fail char-list) (check-string char-list "rat"))
((if fail) (mv t 0 0))
(char-list (trim-leading-whitespace char-list))
((mv fail num-vars char-list) (parse-integer char-list))
((if fail) (mv t 0 0))
(char-list (trim-leading-whitespace char-list))
((mv fail num-clauses ?char-list) (parse-integer char-list))
((if fail) (mv t 0 0))
)
(mv nil num-vars num-clauses)))
;; ========================== Clause Parser ==========================
(defun parse-clause (char-list)
(b* ((char-list (trim-leading-whitespace char-list))
((when (atom char-list)) (mv t nil))
((mv fail lit char-list) (parse-integer char-list))
((when fail) (mv t nil))
((when (equal lit 0)) (mv nil nil))
((mv fail clause) (parse-clause char-list)))
(mv fail (cons lit clause))))
;; ========================== Proof Parser ==========================
; (channel state) -> (mv bool:fail [[integer]]:clause-list state)
(defun parse-clause-loop (channel state)
(b*
(((mv eof char-list state) (read-line channel state))
((mv fail clause) (parse-clause char-list))
;((if fail) (mv (not eof) nil state)) ; ????
((if fail)
(b* ();(- (cw "Parse-clause failed. EOF=~p0.~%" eof)))
(mv (not eof) nil state)))
;((if eof) (mv nil (list clause) state))
((if eof)
(b* ();(- (cw "EOF reached naturally.~%")))
(mv nil (list clause) state)))
;(- (cw "~p0~%" clause))
;(- (cw "."))
((mv fail clause-list state) (parse-clause-loop channel state))
)
(mv fail (cons clause clause-list) state)))
; (channel state) -> (mv bool:eof state)
(defun parse-comment-loop (channel state)
(let ((char (peek-char$ channel state)))
(case char
('nil (mv t state)) ; EOF
(#\c (mv-let (eof state)
(skip-line channel state)
(if eof
(mv t state)
(parse-comment-loop channel state))))
(otherwise
(mv nil state)))))
; (string:filename state) -> (mv bool:fail
; integer:num-vars
; integer:num-clauses
; [[integer]]:clause-list
; state)
(defun parse-unsat-proof-with-state (filename state)
(b*
(((mv channel state) (open-input-channel filename :character state))
((mv eof state) (parse-comment-loop channel state))
((if eof) (mv 'comment-loop-fail nil nil nil state))
((mv eof char-list state) (read-line channel state))
((if eof) (mv 'meta-info-read-line-fail nil nil nil state))
((mv fail num-vars num-clauses) (parse-meta-info char-list))
((if fail) (mv 'meta-info-fail nil nil nil state))
((mv fail clause-list state) (parse-clause-loop channel state))
)
(mv fail num-vars num-clauses clause-list state)))
;; ===================================================================
; The functions above will all be in the package "PROOF-PARSER". The final
; function parse-unsat-proof will be in the "ACL2" package.
(in-package "ACL2")
; (string:filename) -> (mv bool:fail
; integer:num-vars
; integer:num-clauses
; [[integer]]:clause-list)
(defun parse-unsat-proof (filename)
(with-local-state
(mv-let (fail num-vars num-clauses clause-list state)
(PROOF-PARSER::parse-unsat-proof-with-state filename state)
(mv fail num-vars num-clauses clause-list))))
(logic)
#||
(acl2::parse-unsat-proof "rat-1")
(NIL 8 9
((1 2)
(3 4)
(5 6)
(-1 -3)
(-1 -5)
(-3 -5)
(-2 -4)
(-2 -6)
(-4 -6)
(7 -1)
(7 -5 -2)
(-7 1 5)
(-7 1 2)
(8 -3)
(8 -5 -4)
(-8 3 5)
(-8 3 4)
(7)
(8)
(-7 -8 2)
(-7 -8)
NIL))
||#
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