- (let ((inst-var (gensym "INST"))
- (class-name (symbolicate code '-inst))
- (constructor-name (symbolicate 'make- code '-inst))
- (keys (mapcar (lambda (arg) (intern (symbol-name arg) :keyword))
- args)))
- `(progn
- (defclass ,class-name (inst)
- ,(mapcar (lambda (arg key)
- `(,arg :initarg ,key :reader ,(symbolicate 'inst- arg)))
- args keys))
- (defun ,constructor-name (,@args)
- (make-instance ',class-name ,@(mappend #'list keys args)))
- (defmethod inst-metric ((,inst-var ,class-name))
- (with-slots (,@args) ,inst-var
- (+ 1 ,@(mapcar (lambda (arg) `(inst-metric ,arg)) args))))
- (defmethod print-object ((,inst-var ,class-name) ,streamvar)
- (with-slots (,@args) ,inst-var
- (if *print-escape*
- (print-unreadable-object (,inst-var ,streamvar :type t)
- (format stream "~@<~@{~S ~@_~S~^ ~_~}~:>"
- ,@(mappend #'list keys args)))
- (block ,code ,@body))))
- ,@(and export `((export '(,class-name ,constructor-name
- ,@(mapcar (lambda (arg)
- (symbolicate 'inst- arg))
- args)))))
- ',code)))
+ (multiple-value-bind (bvl public private)
+ ;; The hard part of this is digging through the BVL to find the slot
+ ;; names. Collect them into an actual BVL which will be acceptable to
+ ;; `defun', and (matching) lists of the PUBLIC and PRIVATE names of the
+ ;; slots.
+
+ (let ((state :mandatory)
+ (bvl (make-list-builder))
+ (public (make-list-builder))
+ (private (make-list-builder)))
+
+ (labels ((recurse-arg (arg path)
+ ;; Figure out the argument name in ARG, which might be a
+ ;; symbol or a list with the actual argument name buried
+ ;; in it somewhere. Once we've found it, return the
+ ;; appropriate entries to add to the BVL, PUBLIC, and
+ ;; PRIVATE lists.
+ ;;
+ ;; The PATH indicates a route to take through the tree to
+ ;; find the actual argument name: it's a list of
+ ;; nonnegative integers, one for each level of structure:
+ ;; the integer indicates which element of the list at that
+ ;; level to descend into to find the argument name
+ ;; according to the usual BVL syntax. It's always
+ ;; acceptable for a level to actually be a symbol, which
+ ;; is then the argument name we were after. If we reach
+ ;; the bottom and we still have a list, then it must be a
+ ;; (PUBLIC PRIVATE) pair.
+
+ (cond ((symbolp arg)
+ ;; We've bottommed out at a symbol. If it starts
+ ;; with a `%' then that's the private name: strip
+ ;; the `%' to find the public name. Otherwise, the
+ ;; symbol is all we have.
+
+ (let ((name (symbol-name arg)))
+ (if (and (plusp (length name))
+ (char= (char name 0) #\%))
+ (let ((public (intern (subseq name 1))))
+ (values public public arg))
+ (values arg arg arg))))
+
+ ((atom arg)
+ ;; Any other kind of atom is obviously bogus.
+ (error "Unexpected item ~S in lambda-list." arg))
+
+ ((null path)
+ ;; We've bottommed out of the path and still have a
+ ;; list. It must be (PUBLIC PRIVATE).
+
+ (multiple-value-bind (public private)
+ (if (cdr arg) (values (car arg) (cadr arg))
+ (values (car arg) (car arg)))
+ (values public public private)))
+
+ (t
+ ;; We have a list. Take the first step in the
+ ;; PATH, and recursively process corresponding list
+ ;; element with the remainder of the PATH. The
+ ;; PUBLIC and PRIVATE slot names are fine, but we
+ ;; must splice the given BVL entry into our list
+ ;; structure.
+
+ (let* ((step (car path))
+ (mine (nthcdr step arg)))
+ (multiple-value-bind (full public private)
+ (recurse-arg (car mine) (cdr path))
+ (values (append (subseq arg 0 step)
+ full
+ (cdr mine))
+ public
+ private))))))
+
+ (hack-arg (arg maxdp)
+ ;; Find the actual argument name in a BVL entry, and add
+ ;; the appropriate entries to the `bvl', `public', and
+ ;; `private' lists.
+
+ (multiple-value-bind (full public-name private-name)
+ (recurse-arg arg maxdp)
+ (lbuild-add bvl full)
+ (lbuild-add public public-name)
+ (lbuild-add private private-name))))
+
+ ;; Process the augmented BVL, extracting a standard BVL suitable
+ ;; for `defun', and the public and private slot names into our
+ ;; list.
+ (dolist (arg args)
+ (cond ((or (eq arg '&optional)
+ (eq arg '&rest)
+ (eq arg '&key)
+ (eq arg '&aux))
+ (setf state arg)
+ (lbuild-add bvl arg))
+
+ ((eq arg '&allow-other-keys)
+ (lbuild-add bvl arg))
+
+ ((or (eq state :mandatory)
+ (eq state '&rest))
+ (hack-arg arg '()))
+
+ ((or (eq state '&optional)
+ (eq state '&aux))
+ (hack-arg arg '(0)))
+
+ ((eq state '&key)
+ (hack-arg arg '(0 1)))
+
+ (t
+ (error "Confusion in ~S!" 'definst)))))
+
+ ;; Done! That was something of a performance.
+ (values (lbuild-list bvl)
+ (lbuild-list public)
+ (lbuild-list private)))
+
+ ;; Now we can actually build the pieces of the code-generation machinery.
+ (let* ((inst-var (gensym "INST"))
+ (class-name (symbolicate code '-inst))
+ (constructor-name (symbolicate 'make- code '-inst))
+ (keys (mapcar (lambda (arg) (intern (symbol-name arg) :keyword))
+ public)))
+ (multiple-value-bind (docs decls body) (parse-body body)
+
+ ;; We have many jobs to do in the expansion.
+ `(progn
+
+ ;; A class to hold the data.
+ (defclass ,class-name (inst)
+ ,(mapcar (lambda (public-slot private-slot key)
+ `(,private-slot :initarg ,key
+ :reader
+ ,(symbolicate 'inst- public-slot)))
+ public private keys))
+
+ ;; A constructor to make an instance of the class.
+ (defun ,constructor-name (,@bvl)
+ (make-instance ',class-name ,@(mappend #'list keys public)))
+
+ ;; A method on `inst-metric', to feed into inlining heuristics.
+ (defmethod inst-metric ((,inst-var ,class-name))
+ (with-slots (,@private) ,inst-var
+ (+ 1 ,@(mapcar (lambda (slot) `(inst-metric ,slot))
+ private))))
+
+ ;; A method to actually produce the necessary output.
+ (defmethod print-object ((,inst-var ,class-name) ,streamvar)
+ (with-slots ,(mapcar #'list public private) ,inst-var
+ (if *print-escape*
+ (print-unreadable-object (,inst-var ,streamvar :type t)
+ (format ,streamvar "~@<~@{~S ~@_~S~^ ~_~}~:>"
+ ,@(mappend #'list keys public)))
+ (block ,code
+ ,@(if (null decls) body
+ `((locally ,@decls ,@body)))))))
+
+ ;; Maybe export all of this stuff.
+ ,@(and export `((export '(,class-name ,constructor-name
+ ,@(mapcar (lambda (slot)
+ (symbolicate 'inst- slot))
+ public)))))
+
+ ;; Remember the documentation.
+ ,@(and docs `((setf (get ',class-name 'inst-documentation)
+ ,@docs)))
+
+ ;; And try not to spam a REPL.
+ ',code)))))
+
+(defmethod documentation ((symbol symbol) (doc-type (eql 'inst)))
+ (get symbol 'inst-documentation))
+(defmethod (setf documentation) (doc (symbol symbol) (doc-type (eql 'inst)))
+ (setf (get symbol 'inst-documentation) doc))
~mdw / sod / blobdiff