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(defvar *place-clobber-expander* (hash))
(defvar *place-update-expander* (hash))
(defvar *place-delete-expander* (hash))
(defvar *place-macro* (hash))
(defvar sys:*pl-env* nil)
(defvar sys:*pl-form* nil)
(defun sys:eval-err (. params)
(throwf 'eval-error . params))
(defun sys:sym-update-expander (getter-name setter-name
place-expr op-body)
^(macrolet ((,getter-name () ',place-expr)
(,setter-name (val-expr) ^(sys:setq ,',place-expr
,val-expr)))
,op-body))
(defun sys:sym-clobber-expander (simple-setter-name
place-expr op-body)
^(macrolet ((,simple-setter-name (val-expr)
^(sys:setq ,',place-expr ,val-expr)))
,op-body))
(defun sys:sym-delete-expander (deleter-name
place-expr . op-body)
^(macrolet ((,deleter-name (:env env)
(when (lexical-var-p env ',place-expr)
(sys:eval-err "~s is a lexical variable, thus not deletable"
',place-expr))
^(prog1
(symbol-value ',',place-expr)
(makunbound ',',place-expr))))
,*op-body))
(defun sys:get-place-macro (sym)
(or [*place-macro* sym]
(progn (sys:try-load sym) [*place-macro* sym])))
(defun sys:pl-expand (unex-place env)
(while t
(let ((place unex-place)
pm-expander)
(while (and (consp place)
(sys:setq pm-expander (sys:get-place-macro (car place)))
(sys:setq place (sys:set-macro-ancestor [pm-expander place] place))
(neq place unex-place))
(sys:setq unex-place place))
(sys:setq place (macroexpand-1 place env))
(when (or (eq place unex-place)
(null place)
(and (atom place) (not (symbolp place))))
(return-from sys:pl-expand place))
(sys:setq unex-place place))))
(defun place-form-p (unex-place env)
(let ((place (sys:pl-expand unex-place env)))
(or (bindable place)
(and (consp place) [*place-update-expander* (car place)] t))))
(defun get-update-expander (place)
(cond
((symbolp place) (fun sys:sym-update-expander))
((consp place) (or [*place-update-expander* (car place)]
(sys:eval-err "~s is not an assignable place" place)))
(t (sys:eval-err "form ~s is not syntax denoting an assignable place" place))))
(defun get-clobber-expander (place)
(cond
((symbolp place) (fun sys:sym-clobber-expander))
((consp place) (or [*place-clobber-expander* (car place)]
(iflet ((fun [*place-update-expander* (car place)]))
(op apply fun (gensym) @1 @2 @rest))
(sys:eval-err "~s is not an assignable place" place)))
(t (sys:eval-err "form ~s is not syntax denoting an assignable place" place))))
(defun get-delete-expander (place)
(cond
((symbolp place) (fun sys:sym-delete-expander))
((consp place) (or [*place-delete-expander* (car place)]
(sys:eval-err "~s is not a deletable place" place)))
(t (sys:eval-err "form ~s is not syntax denoting a deletable place" place))))
(defun sys:r-s-let-expander (bindings body e letsym pred)
(let ((exp-bindings (mapcar (aret ^(,@1 ,(macroexpand @2 e))) bindings)))
(let ((renames [keep-if pred exp-bindings second])
(regular [remove-if pred exp-bindings second]))
(cond ((and renames regular)
^(symacrolet ,renames
(,letsym ,regular ,*body)))
(renames ^(symacrolet ,renames ,*body))
(regular ^(,letsym ,regular ,*body))
(t ^(progn ,*body))))))
(defmacro rlet (bindings :env e . body)
[sys:r-s-let-expander bindings body e 'let constantp])
(defmacro slet (bindings :env e . body)
(sys:r-s-let-expander bindings body e 'let [orf constantp bindable]))
(defmacro alet (bindings :env e . body)
(let ((exp-bindings (mapcar (aret ^(,@1 ,(macroexpand @2 e))) bindings)))
(if [some exp-bindings constantp second]
[sys:r-s-let-expander exp-bindings body e 'alet constantp]
^(,(if [all exp-bindings bindable second]
'symacrolet 'let)
,exp-bindings ,*body))))
(defmacro with-gensyms (syms . body)
^(let ,(zip syms (repeat '((gensym)))) ,*body))
(defun sys:propagate-ancestor (to-tree from-form . syms)
(unless (macro-ancestor to-tree)
(tree-case to-tree
((a . d)
(when (memq a syms)
(sys:set-macro-ancestor to-tree from-form))
(sys:propagate-ancestor a from-form . syms)
(sys:propagate-ancestor d from-form . syms))))
to-tree)
(defun call-update-expander (getter setter unex-place env body)
(sys:propagate-ancestor body unex-place getter setter)
(let* ((place (sys:pl-expand unex-place env))
(expander (get-update-expander place))
(sys:*pl-env* env)
(sys:*pl-form* unex-place)
(expansion [expander getter setter place body])
(expansion-ex (expand expansion env)))
(sys:propagate-ancestor expansion-ex place getter setter)))
(defun call-clobber-expander (ssetter unex-place env body)
(sys:propagate-ancestor body unex-place ssetter)
(let* ((place (sys:pl-expand unex-place env))
(expander (get-clobber-expander place))
(sys:*pl-env* env)
(sys:*pl-form* unex-place)
(expansion [expander ssetter place body])
(expansion-ex (expand expansion env)))
(sys:propagate-ancestor expansion-ex place ssetter)))
(defun call-delete-expander (deleter unex-place env body)
(sys:propagate-ancestor body unex-place deleter)
(let* ((place (sys:pl-expand unex-place env))
(expander (get-delete-expander place))
(sys:*pl-env* env)
(sys:*pl-form* unex-place)
(expansion [expander deleter place body])
(expansion-ex (expand expansion env)))
(sys:propagate-ancestor expansion-ex place deleter)))
(defmacro with-update-expander ((getter setter) unex-place env body)
^(with-gensyms (,getter ,setter)
(call-update-expander ,getter ,setter ,unex-place ,env ,body)))
(defmacro with-clobber-expander ((ssetter) unex-place env body)
^(with-gensyms (,ssetter)
(call-clobber-expander ,ssetter ,unex-place ,env ,body)))
(defmacro with-delete-expander ((deleter) unex-place env body)
^(with-gensyms (,deleter)
(call-delete-expander ,deleter ,unex-place ,env ,body)))
(defmacro set (:env env . place-value-pairs)
(let ((assign-forms (mapcar (tb ((place : (value nil value-present-p)))
(unless value-present-p
(sys:eval-err "set: arguments must be pairs"))
(with-clobber-expander (ssetter) place env
^(,ssetter ,value)))
(tuples 2 place-value-pairs))))
(if (cdr assign-forms)
^(progn ,*assign-forms)
(car assign-forms))))
(defmacro pset (:env env . place-value-pairs)
(let ((len (length place-value-pairs)))
(cond
((oddp len) (sys:eval-err "pset: arguments must be pairs"))
((<= len 2) ^(set ,*place-value-pairs))
(t (let* ((pvtgs (mapcar (tb ((a b))
(list a b (gensym) (gensym) (gensym)))
(tuples 2 place-value-pairs)))
(ls (reduce-left (tb ((lets stores) (place value temp getter setter))
(list ^((,temp ,value) ,*lets)
^((,setter ,temp) ,*stores)))
pvtgs '(nil nil)))
(lets (first ls))
(stores (second ls))
(body-form ^(rlet (,*lets) ,*stores)))
(reduce-left (tb (accum-form (place value temp getter setter))
(call-update-expander getter setter
place env accum-form))
pvtgs body-form))))))
(defmacro zap (place : (new-val nil) :env env)
(with-update-expander (getter setter) place env
^(prog1 (,getter) (,setter ,new-val))))
(defmacro flip (place :env env)
(with-update-expander (getter setter) place env
^(,setter (not (,getter)))))
(defmacro inc (place : (delta 1) :env env)
(with-update-expander (getter setter) place env
(caseql delta
(0 place)
(1 ^(,setter (succ (,getter))))
(2 ^(,setter (ssucc (,getter))))
(3 ^(,setter (sssucc (,getter))))
(t ^(,setter (+ (,getter) ,delta))))))
(defmacro dec (place : (delta 1) :env env)
(with-update-expander (getter setter) place env
(caseql delta
(0 place)
(1 ^(,setter (pred (,getter))))
(2 ^(,setter (ppred (,getter))))
(3 ^(,setter (pppred (,getter))))
(t ^(,setter (- (,getter) ,delta))))))
(defmacro pinc (place : (delta 1) :env env)
(with-gensyms (oldval)
(with-update-expander (getter setter) place env
(caseql delta
(0 place)
(1 ^(let ((,oldval (,getter))) (,setter (succ ,oldval)) ,oldval))
(2 ^(let ((,oldval (,getter))) (,setter (ssucc ,oldval)) ,oldval))
(3 ^(let ((,oldval (,getter))) (,setter (sssucc ,oldval)) ,oldval))
(t ^(let ((,oldval (,getter))) (,setter (+ ,oldval, delta)) ,oldval))))))
(defmacro pdec (place : (delta 1) :env env)
(with-gensyms (oldval)
(with-update-expander (getter setter) place env
(caseql delta
(0 place)
(1 ^(let ((,oldval (,getter))) (,setter (pred ,oldval)) ,oldval))
(2 ^(let ((,oldval (,getter))) (,setter (ppred ,oldval)) ,oldval))
(3 ^(let ((,oldval (,getter))) (,setter (pppred ,oldval)) ,oldval))
(t ^(let ((,oldval (,getter))) (,setter (- ,oldval, delta)) ,oldval))))))
(defmacro swap (place-0 place-1 :env env)
(with-gensyms (tmp)
(with-update-expander (getter-0 setter-0) place-0 env
(with-update-expander (getter-1 setter-1) place-1 env
^(let ((,tmp (,getter-0)))
(,setter-0 (,getter-1))
(,setter-1 ,tmp))))))
(defmacro push (new-item place :env env)
(with-gensyms (new-sym)
^(alet ((,new-sym ,new-item))
,(with-update-expander (getter setter) place env
^(,setter (cons ,new-sym (,getter)))))))
(defmacro pop (place :env env)
(with-gensyms (tmp)
(with-update-expander (getter setter) place env
^(alet ((,tmp (,getter)))
(prog1 (car ,tmp) (,setter (cdr ,tmp)))))))
(defmacro pushnew (new-item place :env env :
(testfun :)
(keyfun :))
(with-update-expander (getter setter) place env
(with-gensyms (new-item-sym old-list-sym)
^(rlet ((,new-item-sym ,new-item))
,(with-update-expander (getter setter) place env
^(let ((,old-list-sym (,getter)))
(if (member ,new-item-sym ,old-list-sym ,testfun ,keyfun)
,old-list-sym
(,setter (cons ,new-item-sym ,old-list-sym)))))))))
(defmacro shift (:form f :env env . places)
(tree-case places
(() (compile-error f "need at least two arguments"))
((place) (compile-error f "need at least two arguments"))
((place newvalue)
(with-update-expander (getter setter) place env
^(prog1 (,getter) (,setter ,newvalue))))
((place . others)
(with-update-expander (getter setter) place env
^(prog1 (,getter) (,setter (shift ,*others)))))))
(defmacro rotate (:env env . places)
(tree-case places
(() ())
((fplace) fplace)
((fplace . rplaces)
(with-gensyms (tmp)
(with-update-expander (getter-f setter-f) fplace env
^(let ((,tmp (,getter-f)))
(,setter-f (shift ,*rplaces ,tmp))
,tmp))))))
(defmacro test-set (:env env place)
(with-update-expander (getter setter) place env
^(unless (,getter)
(,setter t))))
(defmacro test-clear (:env env place)
(with-update-expander (getter setter) place env
^(when (,getter)
(,setter nil)
t)))
(defmacro compare-swap (:env env comp-fun place comp-val store-val)
(with-update-expander (getter setter) place env
^(when (,comp-fun (,getter) ,comp-val)
(,setter ,store-val)
t)))
(defmacro test-inc (place : (delta 1) (upfrom-val 0))
^(eql (pinc ,place ,delta) ,upfrom-val))
(defmacro test-dec (place : (delta 1) (downto-val 0))
^(eql (dec ,place ,delta) ,downto-val))
(defmacro del (place :env env)
(with-delete-expander (deleter) place env
^(,deleter)))
(defmacro lset (:form f . places-source)
(let ((places (butlast places-source))
(source (last places-source))
(orig (gensym))
(iter (gensym)))
(unless places
(compile-error f "require one or more places followed by expression"))
^(let* ((,orig ,(car source))
(,iter ,orig))
,*(butlast (mappend (ret ^((set ,@1 (car ,iter)) (set ,iter (cdr ,iter))))
places))
,orig)))
(defmacro upd (place . opip-args)
(with-gensyms (pl)
^(placelet ((,pl ,place))
(set ,pl (call (opip ,*opip-args) ,pl)))))
(defmacro defplace (place-destructuring-args body-sym
(getter-sym setter-sym update-body) :
((ssetter-sym clobber-body))
((deleter-sym delete-body)))
(let ((name (car place-destructuring-args))
(args (cdr place-destructuring-args)))
(unless (and name
(symbolp name)
(not (keywordp name))
(not (eq t name)))
(compile-error sys:*pl-form* "~s cannot be used as a place name" name))
(with-gensyms (place)
^(progn
(sethash *place-update-expander* ',name
(lambda (,getter-sym ,setter-sym ,place ,body-sym)
(tree-bind ,args (cdr ,place)
,update-body)))
,*(if ssetter-sym
^((sethash *place-clobber-expander* ',name
(lambda (,ssetter-sym ,place ,body-sym)
(tree-bind ,args (cdr ,place)
,clobber-body)))))
,*(if deleter-sym
^((sethash *place-delete-expander* ',name
(lambda (,deleter-sym ,place ,body-sym)
(tree-bind ,args (cdr ,place)
,delete-body)))))
',name))))
(defmacro define-place-macro (name place-destructuring-args . body)
(with-gensyms (name-dummy args)
^(progn
(sethash *place-macro* ',name
(lambda (,args)
(mac-param-bind ,args
(,name-dummy ,*place-destructuring-args)
,args ,*body)))
',name)))
(defplace (sys:var arg) body
(getter setter
^(macrolet ((,getter () ^(sys:var ,',arg))
(,setter (val) ^(sys:setq ,'(sys:var ,arg) ,val)))
,body)))
(defplace (sys:l1-val arg) body
(getter setter
^(macrolet ((,getter () ^(sys:l1-val ,',arg))
(,setter (val) ^(sys:l1-setq ,',arg ,val)))
,body))
(ssetter
^(macrolet ((,ssetter (val) ^(sys:l1-setq ,',arg ,val)))
,body)))
(defplace (sys:lisp1-value arg) body
(getter setter
^(macrolet ((,getter () ^(sys:lisp1-value ,',arg))
(,setter (val) ^(sys:lisp1-setq ,',arg ,val)))
,body))
(ssetter
^(macrolet ((,ssetter (val) ^(sys:lisp1-setq ,',arg ,val)))
,body)))
(defplace (car cell) body
(getter setter
(with-gensyms (cell-sym)
^(slet ((,cell-sym ,cell))
(macrolet ((,getter () ^(car ,',cell-sym))
(,setter (val) ^(sys:rplaca ,',cell-sym ,val)))
,body))))
(ssetter
^(macrolet ((,ssetter (val) ^(sys:rplaca ,',cell ,val)))
,body))
(deleter
^(macrolet ((,deleter () ^(pop ,',cell)))
,body)))
(defplace (cdr cell) body
(getter setter
(with-gensyms (cell-sym)
^(slet ((,cell-sym ,cell))
(macrolet ((,getter () ^(cdr ,',cell-sym))
(,setter (val) ^(sys:rplacd ,',cell-sym ,val)))
,body))))
(ssetter
^(macrolet ((,ssetter (val) ^(sys:rplacd ,',cell ,val)))
,body))
(deleter
^(macrolet ((,deleter ()
(with-gensyms (tmp)
(with-update-expander (cgetter csetter) ',cell nil
^(let ((,tmp (,cgetter)))
(prog1 (cdr ,tmp) (,csetter (car ,tmp))))))))
,body)))
(defplace (nthcdr index list) body
(getter setter
(with-gensyms (index-sym list-sym sentinel-head-sym parent-cell-sym)
(if (place-form-p list sys:*pl-env*)
(with-update-expander (lgetter lsetter) list sys:*pl-env*
^(alet ((,index-sym ,index)
(,list-sym (,lgetter)))
(let* ((,sentinel-head-sym (cons nil ,list-sym))
(,parent-cell-sym (nthcdr ,index-sym ,sentinel-head-sym)))
(macrolet ((,getter () ^(cdr ,',parent-cell-sym))
(,setter (val)
^(prog1 (sys:rplacd ,',parent-cell-sym ,val)
(,',lsetter (cdr ,',sentinel-head-sym)))))
,body))))
^(alet ((,index-sym ,index)
(,list-sym ,list))
(let ((,parent-cell-sym (nthcdr (pred ,index-sym) ,list-sym)))
(macrolet ((,getter () ^(cdr ,',parent-cell-sym))
(,setter (val)
^(sys:rplacd ,',parent-cell-sym ,val)))
,body)))))))
(defplace (nthlast index list) body
(getter setter
(with-gensyms (index-sym list-sym sentinel-head-sym parent-cell-sym)
(if (place-form-p list sys:*pl-env*)
(with-update-expander (lgetter lsetter) list sys:*pl-env*
^(alet ((,index-sym ,index)
(,list-sym (,lgetter)))
(let* ((,sentinel-head-sym (cons nil ,list-sym))
(,parent-cell-sym (nthlast (succ ,index-sym)
,sentinel-head-sym)))
(macrolet ((,getter () ^(cdr ,',parent-cell-sym))
(,setter (val)
^(prog1 (sys:rplacd ,',parent-cell-sym ,val)
(,',lsetter (cdr ,',sentinel-head-sym)))))
,body))))
^(alet ((,index-sym index)
(,list-sym ,list))
(let ((,parent-cell-sym (nthlast (succ ,index-sym) ,list-sym)))
(macrolet ((,getter () ^(cdr ,',parent-cell-sym))
(,setter (val)
^(sys:rplacd ,',parent-cell-sym ,val)))
,body)))))))
(defplace (butlastn num list) body
(getter setter
(with-gensyms (num-sym list-sym head-sym tail-sym val-sym)
(with-update-expander (lgetter lsetter) list sys:*pl-env*
^(alet ((,num-sym ,num)
(,list-sym (,lgetter)))
(let* ((,tail-sym (nthlast ,num-sym ,list-sym))
(,head-sym (ldiff ,list-sym ,tail-sym)))
(macrolet ((,getter () ,head-sym)
(,setter (val)
^(alet ((,',val-sym ,val))
(progn (,',lsetter (append ,',val-sym
,',tail-sym))
,',val-sym))))
,body)))))))
(defplace (vecref vector index :whole args) body
(getter setter
(with-gensyms (vec-sym ind-sym)
^(alet ((,vec-sym ,vector)
(,ind-sym ,index))
(macrolet ((,getter () ^(vecref ,',vec-sym ,',ind-sym))
(,setter (val) ^(refset ,',vec-sym ,',ind-sym ,val)))
,body))))
(ssetter
^(macrolet ((,ssetter (val) ^(refset ,*',args ,val)))
,body))
(deleter
(with-gensyms (vec-sym ind-sym)
^(alet ((,vec-sym ,vector)
(,ind-sym ,index))
(macrolet ((,deleter ()
^(prog1 (vecref ,',vec-sym ,',ind-sym)
(replace-vec ,',vec-sym nil
,',ind-sym (succ ,',ind-sym)))))
,body)))))
(defplace (chr-str string index :whole args) body
(getter setter
(with-gensyms (str-sym ind-sym)
^(alet ((,str-sym ,string)
(,ind-sym ,index))
(macrolet ((,getter () ^(chr-str ,',str-sym ,',ind-sym))
(,setter (val) ^(chr-str-set ,',str-sym ,',ind-sym ,val)))
,body))))
(ssetter
^(macrolet ((,ssetter (val) ^(chr-str-set ,*',args ,val)))
,body))
(deleter
(with-gensyms (str-sym ind-sym)
^(alet ((,str-sym ,string)
(,ind-sym ,index))
(macrolet ((,deleter ()
^(prog1 (chr-str ,',str-sym ,',ind-sym)
(replace-str ,',str-sym nil
,',ind-sym (succ ,',ind-sym)))))
,body)))))
(defplace (ref seq index :whole args) body
(getter setter
(with-gensyms (seq-sym ind-sym)
^(alet ((,seq-sym ,seq)
(,ind-sym ,index))
(macrolet ((,getter () ^(ref ,',seq-sym ,',ind-sym))
(,setter (val) ^(refset ,',seq-sym ,',ind-sym ,val)))
,body))))
(ssetter
^(macrolet ((,ssetter (val) ^(refset ,*',args ,val)))
,body))
(deleter
(with-gensyms (seq-sym ind-sym)
^(alet ((,seq-sym ,seq)
(,ind-sym ,index))
(macrolet ((,deleter ()
^(prog1 (ref ,',seq-sym ,',ind-sym)
(replace ,',seq-sym nil
,',ind-sym (succ ,',ind-sym)))))
,body)))))
(defplace (sub seq :whole args : (from 0) (to t)) body
(getter setter
(with-gensyms (seq-sym from-sym to-sym v-sym)
(with-update-expander (seq-getter seq-setter) seq sys:*pl-env*
^(alet ((,seq-sym (,seq-getter))
(,from-sym ,from)
(,to-sym ,to))
(macrolet ((,getter () ^(sub ,',seq-sym ,',from-sym ,',to-sym))
(,setter (val)
^(alet ((,',v-sym ,val))
(,',seq-setter (replace ,',seq-sym ,',v-sym
,',from-sym ,',to-sym))
,',v-sym)))
,body)))))
(ssetter
(with-gensyms (seq-sym from-sym to-sym v-sym)
(with-update-expander (seq-getter seq-setter) seq sys:*pl-env*
^(macrolet ((,ssetter (val)
^(alet ((,',seq-sym (,',seq-getter))
(,',from-sym ,',from)
(,',to-sym ,',to)
(,',v-sym ,val))
(,',seq-setter (replace ,',seq-sym ,',v-sym
,',from-sym ,',to-sym))
,',v-sym)))
,body))))
(deleter
(with-gensyms (seq-sym from-sym to-sym)
(with-update-expander (seq-getter seq-setter) seq sys:*pl-env*
^(alet ((,seq-sym (,seq-getter))
(,from-sym ,from)
(,to-sym ,to))
(macrolet ((,deleter ()
^(prog1
(sub ,',seq-sym ,',from-sym ,',to-sym)
(,',seq-setter (replace ,',seq-sym nil
,',from-sym ,',to-sym)))))
,body))))))
(defplace (gethash hash key : (default nil have-default-p)) body
(getter setter
(with-gensyms (entry-sym)
^(let ((,entry-sym (inhash ,hash ,key ,default)))
(macrolet ((,getter () ^(cdr ,',entry-sym))
(,setter (val) ^(sys:rplacd ,',entry-sym ,val)))
,body))))
nil
(deleter
^(macrolet ((,deleter ()
(if ,have-default-p
(with-gensyms (entry-sym
dfl-sym)
^(alet ((,entry-sym (inhash ,',hash ,',key))
(,dfl-sym ,',default))
(if ,entry-sym
(remhash ,',hash ,',key)
,dfl-sym)))
^(remhash ,',hash ,',key))))
,body)))
(defplace (hash-userdata hash) body
(getter setter
(with-gensyms (hash-sym)
^(slet ((,hash-sym ,hash))
(macrolet ((,getter () ^(hash-userdata ,',hash-sym))
(,setter (val) ^(set-hash-userdata ,',hash-sym ,val)))
,body))))
(ssetter
^(macrolet ((,ssetter (val)
^(set-hash-userdata ,',hash ,val)))
,body)))
(defplace (dwim obj-place :env env . args) body
(getter setter
(with-gensyms (ogetter-sym osetter-sym obj-sym newval-sym)
(let ((arg-syms (mapcar (ret (gensym)) args)))
(if (place-form-p obj-place sys:*pl-env*)
(with-update-expander (ogetter-sym osetter-sym)
^(sys:l1-val ,obj-place) sys:*pl-env*
^(rlet ((,obj-sym (,ogetter-sym))
,*(mapcar (ret ^(,@1 (sys:l1-val ,@2))) arg-syms args))
(macrolet ((,getter ()
'[,obj-sym ,*arg-syms])
(,setter (val)
^(rlet ((,',newval-sym ,val))
(,',osetter-sym
(sys:dwim-set t ,',obj-sym
,*',arg-syms ,',newval-sym))
,',newval-sym)))
,body)))
^(rlet ((,obj-sym ,obj-place)
,*(mapcar (ret ^(,@1 (sys:l1-val ,@2))) arg-syms args))
(macrolet ((,getter ()
'[,obj-sym ,*arg-syms])
(,setter (val)
^(rlet ((,',newval-sym ,val))
(sys:dwim-set nil ,',obj-sym
,*',arg-syms ,',newval-sym)
,',newval-sym)))
,body))))))
(ssetter
(with-gensyms (osetter-sym ogetter-sym obj-sym newval-sym)
(let ((arg-syms (mapcar (ret (gensym)) args)))
(if (place-form-p obj-place sys:*pl-env*)
(with-update-expander (ogetter-sym osetter-sym)
^(sys:l1-val ,obj-place) sys:*pl-env*
^(macrolet ((,ssetter (val)
^(rlet ((,',obj-sym (,',ogetter-sym))
,*(mapcar (ret ^(,@1 (sys:l1-val ,@2)))
',arg-syms ',args)
(,',newval-sym ,val))
(,',osetter-sym
(sys:dwim-set t ,',obj-sym
,*',arg-syms
,',newval-sym))
,',newval-sym)))
,body))
^(macrolet ((,ssetter (val)
^(rlet ((,',obj-sym ,',obj-place)
,*(mapcar (ret ^(,@1 (sys:l1-val ,@2)))
',arg-syms ',args)
(,',newval-sym ,val))
(sys:dwim-set nil ,',obj-sym
,*',arg-syms
,',newval-sym)
,',newval-sym)))
,body)))))
(deleter
(with-gensyms (osetter-sym ogetter-sym obj-sym oldval-sym)
(let ((arg-syms (mapcar (ret (gensym)) args)))
(if (place-form-p obj-place sys:*pl-env*)
(with-update-expander (ogetter-sym osetter-sym)
^(sys:l1-val ,obj-place) sys:*pl-env*
^(macrolet ((,deleter ()
^(rlet ((,',obj-sym (,',ogetter-sym))
,*(mapcar (ret ^(,@1 (sys:l1-val ,@2)))
',arg-syms ',args))
(let ((,',oldval-sym [,',obj-sym ,*',arg-syms]))
(progn
(,',osetter-sym
(sys:dwim-del t ,',obj-sym ,*',arg-syms))
,',oldval-sym)))))
,body))
^(macrolet ((,deleter ()
^(rlet ((,',obj-sym ,',obj-place)
,*(mapcar (ret ^(,@1 (sys:l1-val ,@2)))
',arg-syms ',args))
(let ((,',oldval-sym [,',obj-sym ,*',arg-syms]))
(progn
(sys:dwim-del nil ,',obj-sym ,*',arg-syms)
,',oldval-sym)))))
,body))))))
(defplace (force promise) body
(getter setter
(with-gensyms (promise-sym)
^(rlet ((,promise-sym ,promise))
(macrolet ((,getter ()
^(force ,',promise-sym))
(,setter (val)
^(set (car (cdr ,',promise-sym)) ,val)))
,body))))
(ssetter
(with-gensyms (promise-sym)
^(rlet ((,promise-sym ,promise))
(macrolet ((,ssetter (val)
^(prog1
(set (car (cdr ,',promise-sym)) ,val)
(set (car ,',promise-sym) 'sys:promise-forced))))
,body)))))
(defplace (errno) body
(getter setter
^(macrolet ((,getter () '(errno))
(,setter (val-expr)
(with-gensyms (val-sym)
^(slet ((,val-sym ,val-expr))
(progn (errno ,val-sym) ,val-sym)))))
,body)))
(defplace (fun sym) body
(getter setter
^(macrolet ((,getter () ^(fun ,',sym))
(,setter (val) ^(sys:setqf ,',sym ,val)))
,body))
nil
(deleter
^(macrolet ((,deleter (:env env)
(when (lexical-fun-p env ',sym)
(compile-error ',sys:*pl-form*
"~s is a lexical function, \
\ thus not deletable"))
^(fmakunbound ',',sym)))
,body)))
(defun sys:get-fun-getter-setter (sym : f)
(tree-case sym
((type struct slot)
(if (eq type 'meth)
(caseql slot
(:init (cons (op struct-get-initfun struct)
(op struct-set-initfun struct)))
(:postinit (cons (op struct-get-postinitfun struct)
(op struct-set-postinitfun struct)))
(t (cons (op static-slot struct slot)
(op static-slot-ensure struct slot))))
:))
((type sym)
(if (eq type 'macro)
(let ((cell (or (gethash sys:top-mb sym)
(sethash sys:top-mb sym (cons sym nil)))))
(cons (op cdr)
(op sys:rplacd cell)))
:))
((op . rest)
(if (eq op 'lambda)
(compile-error f "cannot assign to lambda")
(compile-error f "invalid function syntax ~s" sym)))
(else
(let ((cell (or (gethash sys:top-fb sym)
(sethash sys:top-fb sym (cons sym nil)))))
(cons (op cdr)
(op sys:rplacd cell))))))
(defplace (symbol-function sym-expr) body
(getter setter
(with-gensyms (gs-sym)
^(let ((,gs-sym (sys:get-fun-getter-setter ,sym-expr ',sys:*pl-form*)))
(macrolet ((,getter () ^(call (car ,',gs-sym)))
(,setter (val) ^(call (cdr ,',gs-sym) ,val)))
,body))))
nil
(deleter
^(macrolet ((,deleter () ^(fmakunbound ,',sym-expr)))
,body)))
(defun sys:get-mb (f sym)
(or (gethash sys:top-mb sym)
(compile-error f "unbound macro ~s" sym)))
(defplace (symbol-macro sym-expr) body
(getter setter
(with-gensyms (binding-sym)
^(let ((,binding-sym (sys:get-mb ',sys:*pl-form* ,sym-expr)))
(macrolet ((,getter () ^(cdr ,',binding-sym))
(,setter (val) ^(sys:rplacd ,',binding-sym ,val)))
,body))))
nil
(deleter
^(macrolet ((,deleter () ^(mmakunbound ,',sym-expr)))
,body)))
(defun sys:get-vb (sym)
(or (gethash sys:top-vb sym)
(sethash sys:top-vb sym (cons sym nil))))
(defplace (symbol-value sym-expr) body
(getter setter
(with-gensyms (binding-sym)
^(let ((,binding-sym (sys:get-vb ,sym-expr)))
(macrolet ((,getter () ^(cdr ,',binding-sym))
(,setter (val) ^(sys:rplacd ,',binding-sym ,val)))
,body))))
nil
(deleter
^(macrolet ((,deleter () ^(makunbound ,',sym-expr)))
,body)))
(defplace (slot struct sym) body
(getter setter
(with-gensyms (struct-sym slot-sym)
^(alet ((,struct-sym ,struct)
(,slot-sym ,sym))
(macrolet ((,getter () ^(slot ,',struct-sym ,',slot-sym))
(,setter (val) ^(slotset ,',struct-sym ,',slot-sym ,val)))
,body))))
(ssetter
^(macrolet ((,ssetter (val) ^(slotset ,',struct ,',sym ,val)))
,body)))
(defmacro define-modify-macro (name lambda-list function)
(let ((cleaned-lambda-list (mapcar [iffi consp car]
(remql : lambda-list))))
(with-gensyms (place-sym args-sym)
^(defmacro ,name (:env env ,place-sym ,*lambda-list)
(with-update-expander (getter setter) ,place-sym env
^(,setter (,',function (,getter) ,,*cleaned-lambda-list)))))))
(defmacro sys:placelet-1 (((sym place)) :env env . body)
(with-gensyms (tmp-place pl-getter pl-setter)
(unwind-protect
(progn
(sethash *place-update-expander* tmp-place
(lambda (tmp-getter tmp-setter tmp-place tmp-body)
^(macrolet ((,tmp-getter () ^(,',pl-getter))
(,tmp-setter (val) ^(,',pl-setter ,val)))
,tmp-body)))
(call-update-expander pl-getter pl-setter place env
^(macrolet ((,tmp-place () ^(,',pl-getter)))
,(expand ^(symacrolet ((,sym (,tmp-place)))
,*body) env))))
(remhash *place-update-expander* tmp-place))))
(defmacro placelet* (:form f sym-place-pairs . body)
(tree-case sym-place-pairs
(() ^(progn ,*body))
(((sym place)) ^(sys:placelet-1 ((,sym ,place)) ,*body))
(((sym place) . rest-pairs) ^(sys:placelet-1 ((,sym ,place))
(placelet* (,*rest-pairs) ,*body)))
(obj (compile-error f "bad syntax: ~s" obj))))
(defmacro placelet (:form f sym-place-pairs . body)
(unless (all sym-place-pairs
[andf consp (opip length (= 2)) (oand first bindable)])
(compile-error f "bad syntax: ~s" sym-place-pairs))
(tree-bind (: syms places) (transpose sym-place-pairs)
(let ((temps (mapcar (ret (gensym)) syms)))
^(placelet* (,*(zip temps places))
(symacrolet (,*(zip syms temps))
,*body)))))
(defun sys:register-simple-accessor (get-fun set-fun)
(sethash *place-update-expander* get-fun
(lambda (getter setter place body)
(let* ((args (cdr place))
(temps (mapcar (ret (gensym)) args)))
^(let (,(zip temps args))
(macrolet ((,getter () ^(,',get-fun ,*',temps))
(,setter (val)
^(,',set-fun ,*',temps ,val)))
,body)))))
(sethash *place-clobber-expander* get-fun
(lambda (ssetter place body)
^(macrolet ((,ssetter (val)
^(,',set-fun ,*(cdr ',place) ,val)))
,body)))
get-fun)
(defmacro define-accessor (get-fun set-fun)
^(sys:register-simple-accessor ',get-fun ',set-fun))
(define-place-macro first (obj) ^(car ,obj))
(define-place-macro rest (obj) ^(cdr ,obj))
(define-place-macro second (obj) ^(ref ,obj 1))
(define-place-macro third (obj) ^(ref ,obj 2))
(define-place-macro fourth (obj) ^(ref ,obj 3))
(define-place-macro fifth (obj) ^(ref ,obj 4))
(define-place-macro sixth (obj) ^(ref ,obj 5))
(define-place-macro seventh (obj) ^(ref ,obj 6))
(define-place-macro eighth (obj) ^(ref ,obj 7))
(define-place-macro ninth (obj) ^(ref ,obj 8))
(define-place-macro tenth (obj) ^(ref ,obj 9))
(define-place-macro last (:env e obj : (n nil have-n))
(cond
((and have-n (constantp n e) (not (plusp n)))
^(sub ,obj t t))
((and have-n (constantp n e))
^(sub ,obj ,(- n) t))
(have-n
^(sub ,obj (- (max ,n 0)) t))
(t ^(sub ,obj -1 t))))
(define-place-macro butlast (:env e obj : (n nil have-n))
(cond
((and have-n (constantp n e) (not (plusp n)))
obj)
((and have-n (constantp n e))
^(sub ,obj 0 ,(- n)))
(have-n
^(sub ,obj 0 (- (max ,n 0))))
(t ^(sub ,obj 0 -1))))
(define-place-macro nth (index obj)
^(car (nthcdr ,index ,obj)))
|