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(defvar sys:*op-ctx*)
(sys:make-struct-type
'sys:op-ctx nil nil '(form gens up meta rec recvar) nil
(lambda (me)
(slotset me 'up sys:*op-ctx*)
(slotset me 'meta (gensym "meta-")))
nil nil)
(defun sys:ensure-op-arg (ctx n)
(let ((ag (slot ctx 'gens)))
(when (> n 1024)
['compile-error (slot ctx 'form)
"@~a calls for function with too many arguments" n])
(for ((i (len ag)) (l))
((<= i n)
(sys:setq ag (append ag (nreverse l)))
(slotset ctx 'gens ag)
[ag n])
((sys:setq i (succ i)))
(sys:setq l (cons (gensym `arg-@(if (plusp i) i "rest")-`) l)))))
(defun sys:op-meta-p (expr)
(tree-case expr
((x y . r) (and (null r)
(cond
((eq x 'sys:expr) (sys:op-meta-p y))
((eq x 'sys:var) (or (integerp y)
(eq y 'rest))))))))
(defun sys:op-rec-p (expr)
(tree-case expr
((x (y . r)) (and (eq x 'sys:expr) (eq y 'usr:rec)))))
(defun sys:op-ensure-rec (ctx : recvar)
(when recvar
(slotset ctx 'recvar t))
(or (slot ctx 'rec) (slotset ctx 'rec (gensym "rec-"))))
(defun sys:op-alpha-rename (f e op-args do-nested-metas)
(let* ((ctx sys:*op-ctx*)
(code ^(macrolet ((sys:expr (:form f arg)
(let ((ctx ,ctx))
(cond
((and (slot ctx 'up)
(or (sys:op-meta-p arg)
(sys:op-rec-p arg)
(equal arg '(sys:var usr:rec))))
^(,(slot (slot ctx 'up) 'meta) (quote ,arg)))
((sys:op-rec-p f)
^(,(sys:op-ensure-rec ctx) ,*(rest arg)))
(t f))))
(sys:var (:form f arg . mods)
(cond
((sys:op-meta-p f)
(unless (integerp arg)
(sys:setq arg 0))
(sys:ensure-op-arg ,ctx arg))
((equal f '(sys:var usr:rec))
(sys:op-ensure-rec ,ctx t))
(t f)))
,*(if do-nested-metas
^((,(slot ctx 'meta) ((quote arg)) arg))))
,op-args)))
(expand code e)))
(eval-only
(defmacro op-ignerr (x)
^(sys:catch (error) ,x () (error (. args)))))
(defun sys:op-expand (f e args)
(unless args
['compile-error f "arguments required"])
(let* ((compat (and (plusp sys:compat) (<= sys:compat 225)))
(ctx (make-struct 'sys:op-ctx ^(form ,f)))
(do-gen)
(sys:*op-ctx* ctx)
(sym (car f))
(syntax-0 (if (eq sym 'do) args ^[,*args]))
(syntax-1 (if (or (null syntax-0) (neq sym 'do) compat)
(sys:op-alpha-rename f e syntax-0 nil)
(or (op-ignerr (sys:op-alpha-rename f e syntax-0 nil))
(let ((syn (sys:op-alpha-rename
f e (append syntax-0
(list (sys:setq do-gen
(gensym))))
nil)))
(when (slot ctx 'gens)
(sys:op-alpha-rename f e syntax-0 nil))
syn))))
(syntax-2 (sys:op-alpha-rename f e syntax-1 t))
(metas (slot ctx 'gens))
(rec (slot ctx 'rec))
(recvar (slot ctx 'recvar))
(rest-sym (sys:ensure-op-arg ctx 0))
(lambda-interior (let ((fargs (tree-case syntax-2
((a b . fa) fa))))
(cond
((and (eq sym 'lop) fargs)
(let ((fargs-l1 (mapcar (lambda (farg)
^(sys:l1-val ,farg))
fargs)))
^[sys:apply ,(car (cdr syntax-2))
(append ,rest-sym (list ,*fargs-l1))]))
(metas syntax-2)
((eq sym 'do)
(cond
(compat syntax-2)
(do-gen
(let ((arg1 (sys:ensure-op-arg ctx 1)))
^(symacrolet ((,do-gen ,arg1))
,syntax-2)))
(t (let ((arg1 (sys:ensure-op-arg ctx 1)))
(append syntax-2 (list arg1))))))
(t (append syntax-2 rest-sym))))))
(let ((metas (slot ctx 'gens)))
(cond
(recvar ^(sys:lbind ((,rec (lambda (,*(cdr metas) . ,rest-sym)
(let ((,rec (fun ,rec)))
,lambda-interior))))
(fun ,rec)))
(rec ^(sys:lbind ((,rec (lambda (,*(cdr metas) . ,rest-sym)
,lambda-interior)))
(fun ,rec)))
(t ^(lambda (,*(cdr metas) . ,rest-sym)
,lambda-interior))))))
(defmacro op (:form f :env e . args)
(sys:op-expand f e args))
(defmacro do (:form f :env e . args)
(sys:op-expand f e args))
(defmacro lop (:form f :env e . args)
(sys:op-expand f e args))
(defmacro ldo (op . args)
^(do ,op @1 ,*args))
(defmacro ap (. args)
^(apf (op ,*args)))
(defmacro ip (. args)
^(ipf (op ,*args)))
(defmacro ado (. args)
^(apf (do ,*args)))
(defmacro ido (. args)
^(ipf (do ,*args)))
(defmacro ret (. args)
^(op identity (progn @rest ,*args)))
(defmacro aret (. args)
^(ap identity (progn @rest ,*args)))
(defun sys:opip-expand (e clauses)
(collect-each ((c clauses))
(if (atom c)
c
(let ((sym (car c)))
(if (member sym '(dwim uref qref))
c
(let ((opdo (if (or (special-operator-p (car c))
(macro-form-p c e)) 'do 'op)))
^(,opdo ,*c)))))))
(defmacro opip (:env e . clauses)
^[chain ,*(sys:opip-expand e clauses)])
(defmacro oand (:env e . clauses)
^[chand ,*(sys:opip-expand e clauses)])
(defmacro flow (val . opip-args)
^(call (opip ,*opip-args) ,val))
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