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;;; This source file is part of the Meta-CVS program,
;;; which is distributed under the GNU license.
;;; Copyright 2002 Kaz Kylheku
(require "slot-refs")
(provide "rcs-utils")
(defstruct rcs-token
(type)
(lexeme))
(defstruct rcs-token-stream
(stream)
(pushback-stack))
(defgeneric rcs-read-token (stream))
(defgeneric rcs-peek-token (stream tok))
(defstruct rcs-admin
(head)
(branch)
(access-list)
(symbols)
(locks)
(locks-strict)
(comment)
(expand)
(newphrases))
(defstruct rcs-delta
(version)
(date)
(author)
(state)
(branches)
(next)
(newphrases))
(defstruct rcs-file
(admin)
(deltas)
(delta-hash))
(defun rcs-special-p (ch)
(or (char= ch #\$) (char= ch #\,) (char= ch #\.)
(char= ch #\;) (char= ch #\:) (char= ch #\@)))
(defun rcs-extract-id-sym-or-num (stream)
(let (contains-dot contains-idchar)
(let ((lexeme (with-output-to-string (ss)
(loop
(let ((ch (peek-char nil stream)))
(cond
((char= ch #\.)
(setf contains-dot t)
(write-char ch ss))
((digit-char-p ch)
(write-char ch ss))
((or (rcs-special-p ch) (char= ch #\space)
(not (graphic-char-p ch)))
(return))
(t (setf contains-idchar t)
(write-char ch ss)))
(read-char stream))))))
(make-rcs-token :type (cond
((and contains-dot contains-idchar) :id)
(contains-idchar :sym)
(t :num))
:lexeme lexeme))))
(defun rcs-extract-string (stream)
(read-char stream)
(make-rcs-token
:type :string
:lexeme
(with-output-to-string (ss)
(let ((state :initial))
(loop
(let ((ch (peek-char nil stream)))
(case state
((:initial)
(if (char= ch #\@)
(setf state :atsign)
(write-char ch ss)))
(otherwise
(if (char= ch #\@)
(progn
(write-char ch ss)
(setf state :initial))
(return))))
(read-char stream)))))))
(defmethod rcs-read-token ((stream stream))
(handler-bind ((end-of-file #'(lambda (condition)
(declare (ignore condition))
(return-from rcs-read-token
(load-time-value
(make-rcs-token :type :eof
:lexeme ""))))))
(loop
(let ((ch (peek-char nil stream)))
(cond
((digit-char-p ch)
(return (rcs-extract-id-sym-or-num stream)))
((char= ch #\@)
(return (rcs-extract-string stream)))
((rcs-special-p ch)
(read-char stream)
(return (make-rcs-token :type :special :lexeme ch)))
((and (graphic-char-p ch) (not (char= ch #\space)))
(return (rcs-extract-id-sym-or-num stream)))
(t (read-char stream)))))))
(defmethod rcs-read-token ((stream t))
(rcs-read-token *standard-input*))
(defmethod rcs-read-token ((rts rcs-token-stream))
(with-slots (stream pushback-stack) rts
(cond
((pop pushback-stack))
(t (rcs-read-token stream)))))
(defmethod rcs-pushback-token ((rts rcs-token-stream) (tok rcs-token))
(push tok (slot-value rts 'pushback-stack)))
(defun rcs-match-optional (stream type-match &optional lexeme-match)
(let ((token (rcs-read-token stream)))
(with-slots (type lexeme) token
(cond
((and lexeme-match
(not (and (eq type type-match) (string= lexeme lexeme-match))))
(rcs-pushback-token stream token)
nil)
((not (eq type type-match))
(rcs-pushback-token stream token)
nil)
(t token)))))
(defun rcs-match-token (stream type-match &optional lexeme-match)
(let ((token (rcs-read-token stream)))
(with-slots (type lexeme) token
(if lexeme-match
(when (not (and (eq type type-match) (string= lexeme lexeme-match)))
(error "rcs-parse: expecting token \"~a\" of type ~a, not \"~a\" of type ~a."
lexeme-match type-match lexeme type))
(when (not (eq type type-match))
(error "rcs-parse: expecting token of type ~a, not ~a." type-match type)))
token)))
(defun rcs-parse-newphrases (stream)
(let (token newphrases)
(with-slot-refs (lexeme) token
(loop
(if (setf token (or (rcs-match-optional stream :sym)
(rcs-match-optional stream :id)))
(let ((phrase (list lexeme)))
(loop
(cond
((setf token (or (rcs-match-optional stream :sym)
(rcs-match-optional stream :id)
(rcs-match-optional stream :num)
(rcs-match-optional stream :string)))
(push lexeme phrase))
((setf token (rcs-match-optional stream :special))
(if (char= lexeme #\:)
(push lexeme phrase)
(progn
(rcs-pushback-token stream token)
(push (nreverse phrase) newphrases)
(return))))
(t (push (nreverse phrase) newphrases)
(return))))
(rcs-match-token stream :special #\;))
(return))))
(nreverse newphrases)))
(defun rcs-parse-admin (stream)
(let ((admin (make-rcs-admin))
token)
(with-multi-slot-refs ((head branch access-list symbols locks locks-strict
comment expand newphrases) admin
(lexeme) token)
;; head { num } ;
(rcs-match-token stream :sym "head")
(setf token (rcs-match-optional stream :num))
(when token
(setf head lexeme))
(rcs-match-token stream :special #\;)
;; { branch { num } ; }
(when (rcs-match-optional stream :sym "branch")
(setf token (rcs-match-optional stream :num))
(when token
(setf branch lexeme))
(rcs-match-token stream :special #\;))
;; access { id } * ;
(rcs-match-token stream :sym "access")
(loop
(setf token (or (rcs-match-optional stream :sym)
(rcs-match-optional stream :id)))
(if token
(push lexeme access-list)
(return)))
(nreverse access-list)
(rcs-match-token stream :special #\;)
;; symbols { sym : num }* ;
(rcs-match-token stream :sym "symbols")
(loop
(setf token (rcs-match-optional stream :sym))
(cond
(token
(let ((symbol lexeme))
(rcs-match-token stream :special #\:)
(setf token (rcs-match-token stream :num))
(push (list symbol lexeme) symbols)))
(t (return))))
(nreverse symbols)
(rcs-match-token stream :special #\;)
;; locks { id : num }* ; { strict ; }
(rcs-match-token stream :sym "locks")
(loop
(setf token (or (rcs-match-optional stream :sym)
(rcs-match-optional stream :id)))
(cond
(token
(let ((symbol lexeme))
(rcs-match-token stream :special #\:)
(setf token (rcs-match-token stream :num))
(push (list symbol lexeme) locks)))
(t (return))))
(nreverse locks)
(rcs-match-token stream :special #\;)
(when (rcs-match-optional stream :sym "strict")
(setf locks-strict t)
(rcs-match-token stream :special #\;))
;; { comment { string } ; }
(when (rcs-match-optional stream :sym "comment")
(setf token (rcs-match-optional stream :string))
(when token
(setf comment lexeme))
(rcs-match-token stream :special #\;))
;; { expand { string } ; }
(when (rcs-match-optional stream :sym "expand")
(setf token (rcs-match-optional stream :string))
(when token
(setf expand lexeme))
(rcs-match-token stream :special #\;))
;; { newphrase }*
(setf newphrases (rcs-parse-newphrases stream))
admin)))
(defun rcs-parse-delta (stream)
(let ((delta (make-rcs-delta))
token)
(with-multi-slot-refs ((version date author state branches
next newphrases) delta
(lexeme) token)
;; num
(setf token (rcs-match-optional stream :num))
(if (not token)
(return-from rcs-parse-delta nil))
(setf version lexeme)
;; date num ;
(rcs-match-token stream :sym "date")
(setf token (rcs-match-token stream :num))
(setf date lexeme)
(rcs-match-token stream :special #\;)
;; author id ;
(rcs-match-token stream :sym "author")
(setf token (or (rcs-match-optional stream :sym)
(rcs-match-token stream :id)))
(setf author lexeme)
(rcs-match-token stream :special #\;)
;; state { id } ;
(rcs-match-token stream :sym "state")
(setf token (or (rcs-match-optional stream :sym)
(rcs-match-optional stream :id)))
(when token
(setf state lexeme))
(rcs-match-token stream :special #\;)
;; branches { num } * ;
(rcs-match-token stream :sym "branches")
(loop
(let ((token (rcs-match-optional stream :num)))
(if token
(push lexeme branches)
(return (nreverse branches)))))
(rcs-match-token stream :special #\;)
;; next { num } ;
(rcs-match-token stream :sym "next")
(setf token (rcs-match-optional stream :num))
(when token
(setf next lexeme))
(rcs-match-token stream :special #\;)
;; { newphrase }*
(when (not (rcs-match-optional stream :sym "desc"))
(setf newphrases (rcs-parse-newphrases stream)))
delta)))
(defun rcs-parse-deltas (stream)
(let (deltas)
(loop
(let ((delta (rcs-parse-delta stream)))
(if delta
(push delta deltas)
(return (nreverse deltas)))))))
(defun rcs-make-delta-hash (deltas)
(let ((hash (make-hash-table :test #'equal)))
(mapc #'(lambda (delta)
(setf (gethash (slot-value delta 'next) hash) delta))
deltas)
hash))
(defun rcs-parse (stream)
"Parse RCS file."
(let ((token-stream (make-rcs-token-stream :stream stream)))
;; We currently just need the admin and delta sections.
(let ((file (make-rcs-file :admin (rcs-parse-admin token-stream)
:deltas (rcs-parse-deltas token-stream))))
(setf (slot-value file 'delta-hash)
(rcs-make-delta-hash (slot-value file 'deltas)))
file)))
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