;; Copyright 2015-2021
;; Kaz Kylheku <kaz@kylheku.com>
;; Vancouver, Canada
;; All rights reserved.
;;
;; Redistribution and use in source and binary forms, with or without
;; modification, are permitted provided that the following conditions are met:
;;
;; 1. Redistributions of source code must retain the above copyright notice, this
;; list of conditions and the following disclaimer.
;;
;; 2. Redistributions in binary form must reproduce the above copyright notice,
;; this list of conditions and the following disclaimer in the documentation
;; and/or other materials provided with the distribution.
;;
;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
;; ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
;; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
;; DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
;; FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
;; SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
;; CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
;; OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
;; OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
(defun sys:bad-slot-syntax (form arg)
(compile-error form "bad slot syntax ~s" arg))
(defun sys:prune-missing-inits (slot-init-forms)
(remove-if (tb ((kind name : (init-form nil init-form-present)))
(and (member kind '(:static :instance :function))
(not init-form-present)))
slot-init-forms))
(defmacro defstruct (:form form name-spec super-spec . slot-specs)
(tree-bind (name args) (tree-case name-spec
((atom . args) (list atom args))
(atom (list atom nil)))
(unless (bindable name)
(compile-error form "~s isn't a bindable symbol" name))
(if (built-in-type-p name)
(compile-warning form "~s is a built-in type" name))
(unless (proper-listp slot-specs)
(compile-error form "bad syntax: dotted form"))
(let* ((instance-init-form nil)
(instance-postinit-form nil)
(instance-fini-form nil)
(slot-init-forms (collect-each ((slot slot-specs))
(tree-case slot
((word name args . body)
(caseq word
(:method
(when (not args)
(compile-error form
"method ~s needs \
\ at least one parameter"
name))
^(:function ,name
(lambda ,args
(block ,name ,*body))))
(:function ^(,word ,name
(lambda ,args
(block ,name
,*body))))
((:static :instance)
(when body
(sys:bad-slot-syntax form slot))
^(,word ,name ,args))
(t :)))
((word (arg) . body)
(caseq word
(:init
(unless (bindable arg)
(sys:bad-slot-syntax form slot))
(when instance-init-form
(compile-error form
"duplicate :init"))
(set instance-init-form
(cons arg body))
^(,word nil nil))
(:postinit
(unless (bindable arg)
(sys:bad-slot-syntax form slot))
(when instance-postinit-form
(compile-error form
"duplicate :postinit"))
(set instance-postinit-form
(cons arg body))
^(,word nil nil))
(:fini
(unless (bindable arg)
(sys:bad-slot-syntax form slot))
(when instance-fini-form
(compile-error form
"duplicate :fini"))
(set instance-fini-form
(cons arg body))
^(,word nil nil))
(t (when body
(sys:bad-slot-syntax form slot))
:)))
((word name)
(caseq word
((:static)
^(,word ,name))
((:instance)
^(,word ,name nil))
((:method :function)
(sys:bad-slot-syntax form slot))
(t ^(:instance ,word ,name))))
((name)
^(:instance ,name nil))
(name
^(:instance ,name nil)))))
(supers (if (and super-spec (atom super-spec))
(list super-spec)
super-spec))
(stat-si-forms [keep-if (op member @1 '(:static :function))
slot-init-forms car])
(pruned-si-forms (sys:prune-missing-inits stat-si-forms))
(func-si-forms [keep-if (op eq :function) pruned-si-forms car])
(val-si-forms [keep-if (op eq :static) pruned-si-forms car])
(inst-si-forms [keep-if (op eq :instance) slot-init-forms car])
(stat-slots [mapcar second stat-si-forms])
(inst-slots [mapcar second inst-si-forms]))
(whenlet ((bad [find-if [notf bindable]
(append stat-slots inst-slots)]))
(compile-error form
(if (symbolp bad)
"slot name ~s isn't a bindable symbol"
"invalid slot specifier syntax: ~s")
bad))
(each ((s supers))
(or (find-struct-type s)
(compile-defr-warning form ^(struct-type . ,s)
"inheritance base ~s \
\ does not name a struct type"
s)))
(let ((arg-sym (gensym))
(type-sym (gensym)))
(register-tentative-def ^(struct-type . ,name))
(each ((s stat-slots))
(register-tentative-def ^(slot . ,s)))
(each ((s inst-slots))
(register-tentative-def ^(slot . ,s)))
^(sys:make-struct-type
',name ',supers ',stat-slots ',inst-slots
,(if (or func-si-forms val-si-forms)
^(lambda (,arg-sym)
,*(mapcar (aret ^(when (static-slot-p ,arg-sym ',@2)
(static-slot-set ,arg-sym ',@2 ,@3)))
(append func-si-forms val-si-forms))))
,(if (or inst-si-forms instance-init-form instance-fini-form)
^(lambda (,arg-sym)
,*(if (cdr instance-fini-form)
^((finalize ,arg-sym (lambda (,(car instance-fini-form))
,*(cdr instance-fini-form))
t)))
,*(if inst-si-forms
^((let ((,type-sym (struct-type ,arg-sym)))
,*(mapcar (aret ^(unless (static-slot-p ,type-sym ',@2)
(slotset ,arg-sym ',@2 ,@3)))
inst-si-forms))))
,*(if (cdr instance-init-form)
^((let ((,(car instance-init-form) ,arg-sym))
,*(cdr instance-init-form))))))
,(when args
(when (> (countql : args) 1)
(compile-error form
"multiple colons in boa syntax"))
(let ((col-pos (posq : args)))
(let ((req-args [args 0..col-pos])
(opt-args (if col-pos [args (succ col-pos)..:])))
(let ((r-gens (mapcar (ret (gensym)) req-args))
(o-gens (mapcar (ret (gensym)) opt-args))
(p-gens (mapcar (ret (gensym)) opt-args)))
^(lambda (,arg-sym ,*r-gens
,*(if opt-args '(:))
,*(if opt-args
(mapcar (ret ^(,@1 nil ,@2))
o-gens p-gens)))
,*(mapcar (ret ^(slotset ,arg-sym ',@1 ,@2))
req-args r-gens)
,*(mapcar (ret ^(if ,@3
(slotset ,arg-sym ',@1 ,@2)))
opt-args o-gens p-gens))))))
,(if instance-postinit-form
^(lambda (,arg-sym)
,*(if (cdr instance-postinit-form)
^((let ((,(car instance-postinit-form) ,arg-sym))
,*(cdr instance-postinit-form)))))))))))
(defmacro sys:struct-lit (name . plist)
^(sys:make-struct-lit ',name ',plist))
(defun sys:check-slot (form slot)
(unless (or (sys:slot-types slot)
(sys:static-slot-types slot))
(compile-defr-warning form ^(slot . ,slot)
"symbol ~s isn't the name of a struct slot"
slot))
slot)
(defun sys:check-struct (form stype)
(unless (find-struct-type stype)
(compile-defr-warning form ^(struct-type . ,stype)
"~s does not name a struct type"
stype)))
(defmacro qref (:form form obj . refs)
(when (null refs)
(throwf 'eval-error "~s: bad syntax" 'qref))
(tree-case obj
((a b) (if (eq a 't)
(let ((s (gensym)))
^(slet ((,s ,b))
(if ,s (qref ,s ,*refs))))
:))
(x (tree-case refs
(() ())
(((pref sym) . more)
(if (eq pref t)
(let ((s (gensym)))
^(let ((,s (qref ,obj ,sym)))
(if ,s (qref ,s ,*more))))
:))
(((dw sym . args))
(if (eq dw 'dwim)
(let ((osym (gensym)))
(sys:check-slot form sym)
^(slet ((,osym ,obj))
,(if (and (plusp sys:compat) (<= sys:compat 251))
^[(slot ,osym ',sym) ,*args]
^[(slot ,osym ',sym) ,osym ,*args])))
:))
(((dw sym . args) . more)
(if (eq dw 'dwim)
(let ((osym (gensym)))
(sys:check-slot form sym)
^(qref (slet ((,osym ,obj))
,(if (and (plusp sys:compat) (<= sys:compat 251))
^[(slot ,osym ',sym) ,*args]
^[(slot ,osym ',sym) ,osym ,*args])) ,*more))
:))
(((sym . args))
(let ((osym (gensym)))
(sys:check-slot form sym)
^(slet ((,osym ,obj))
(call (slot ,osym ',sym) ,osym ,*args))))
(((sym . args) . more)
(let ((osym (gensym)))
(sys:check-slot form sym)
^(qref (slet ((,osym ,obj))
(call (slot ,osym ',sym) ,osym ,*args)) ,*more)))
((sym)
(sys:check-slot form sym)
^(slot ,obj ',sym))
((sym . more)
(sys:check-slot form sym)
^(qref (slot ,obj ',sym) ,*more))
(obj (throwf 'eval-error "~s: bad syntax: ~s" 'qref refs))))))
(defmacro uref (. args)
(cond
((null args) (throwf 'eval-error "~s: bad syntax" 'uref))
((null (cdr args))
(if (consp (car args))
^(umeth ,*(car args))
^(usl ,(car args))))
((eq t (car args))
(with-gensyms (ovar)
^(lambda (,ovar) (qref (t ,ovar) ,*(cdr args)))))
(t (with-gensyms (ovar)
^(lambda (,ovar) (qref ,ovar ,*args))))))
(defun sys:new-type (op form type)
(caseq op
((new lnew) (sys:check-struct form type) ^',type)
(t type)))
(defun sys:new-expander (op form spec pairs)
(when (oddp (length pairs))
(compile-error form "slot initform arguments must occur pairwise"))
(let ((qpairs (mappend (aret ^(',@1 ,@2)) (tuples 2 pairs))))
(tree-case spec
((texpr . args)
(let ((type (sys:new-type op form texpr)))
(caseq op
((new new*) (if qpairs
^(make-struct ,type (list ,*qpairs) ,*args)
^(struct-from-args ,type ,*args)))
((lnew lnew*) ^(make-lazy-struct ,type
(lambda ()
(cons (list ,*qpairs)
(list ,*args))))))))
(texpr
(let ((type (sys:new-type op form texpr)))
(caseq op
((new new*) ^(struct-from-plist ,type ,*qpairs))
((lnew lnew*) ^(make-lazy-struct ,type
(lambda ()
(list (list ,*qpairs)))))))))))
(defmacro new (:form form spec . pairs)
(sys:new-expander (car form) form spec pairs))
(defmacro new* (:form form spec . pairs)
(sys:new-expander (car form) form spec pairs))
(defmacro lnew (:form form spec . pairs)
(sys:new-expander (car form) form spec pairs))
(defmacro lnew* (:form form spec . pairs)
(sys:new-expander (car form) form spec pairs))
(defmacro meth (obj slot . bound-args)
^[(fun method) ,obj ',slot ,*bound-args])
(defmacro usl (:form form slot)
(sys:check-slot form slot)
^(uslot ',slot))
(defmacro umeth (:form form slot . bound-args)
(sys:check-slot form slot)
^[(fun umethod) ',slot ,*bound-args])
(defun sys:define-method (type-sym name fun)
(caseq name
(:init (struct-set-initfun type-sym fun))
(:postinit (struct-set-postinitfun type-sym fun))
(t (static-slot-ensure type-sym name fun)))
^(meth ,type-sym ,name))
(defmacro defmeth (:form form type-sym name arglist . body)
(cond
((not (bindable type-sym))
(compile-error form "~s isn't a valid struct name" type-sym))
((not (find-struct-type type-sym))
(compile-defr-warning form ^(struct-type . ,type-sym)
"definition of struct ~s not seen here" type-sym)))
(register-tentative-def ^(slot . ,name))
^(sys:define-method ',type-sym ',name (lambda ,arglist
(block ,name ,*body))))
(defmacro with-slots ((. slot-specs) obj-expr . body)
(with-gensyms (obj-sym)
^(let ((,obj-sym ,obj-expr))
(symacrolet (,*(mapcar [iff consp
(aret ^(,@1 (slot ,obj-sym ',@2)))
(ret ^(,@1 (slot ,obj-sym ',@1)))]
slot-specs))
,*body))))
(defun sys:rslotset (struct sym meth-sym val)
(prog1
(slotset struct sym val)
(call (umethod meth-sym) struct)))
(defmacro usr:rslot (struct sym meth-sym)
^(slot ,struct ,sym))
(define-place-macro usr:rslot (struct sym meth-sym)
^(sys:rslot ,struct ,sym ,meth-sym))
(defplace (sys:rslot struct sym meth-sym) body
(getter setter
(with-gensyms (struct-sym slot-sym meth-slot-sym)
^(slet ((,struct-sym ,struct)
(,slot-sym ,sym)
(,meth-slot-sym ,meth-sym))
(macrolet ((,getter () ^(slot ,',struct-sym ,',slot-sym))
(,setter (val) ^(sys:rslotset ,',struct-sym ,',slot-sym
,',meth-slot-sym ,val)))
,body))))
(ssetter
^(macrolet ((,ssetter (val) ^(progn
(sys:rslotset ,',struct ,',sym
,',meth-sym ,val))))
,body)))