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ac.lisp
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;;; Implementation of Arc in SBCL
;;; 2008 (c) Pau Fernandez
;;; See COPYING for details
(in-package :arc)
(declaim #.*arc-opt*)
;;; Walker core
(defmacro def-arc-walker ((name prefix) &rest +args)
(flet ((_ (s) (intern (format nil "~a~a" prefix s))))
`(defun ,name (e ,@+args)
(cond ((atom e) (,(_ 'atom) e ,@+args))
((backq? e) (,(_ 'backq) e ,@+args))
((consp e)
(case (car e)
(quote (,(_ 'quote) (cdr e) ,@+args))
(if (,(_ 'if) (cdr e) ,@+args))
(fn (,(_ 'fn) (cdr e) ,@+args))
(set (,(_ 'set) (cdr e) ,@+args))
(t (,(_ 'call) (car e) (cdr e) ,@+args))))
(t (error "Bad object in expression [~a]" e))))))
;;; Utilities
(defun %parse-pairs (rest)
(labels ((_pairs (lst)
(cond ((null lst) nil)
((consp (cdr lst))
(cons (cons (car lst) (cadr lst))
(_pairs (cddr lst))))
(t (error "Odd number of arguments to set")))))
(_pairs rest)))
(defun %sym-list (pargs &optional acum)
(if (null pargs)
(nreverse acum)
(ecase (caar pargs)
((:nrm :opt)
(%sym-list (cdr pargs) (cons (cadar pargs) acum)))
(:rst (cons (cadar pargs) acum))
(:des (%sym-list (cdr pargs)
(append (%sym-list (cadar pargs))
acum))))))
(defun %parse-args (args &optional acum o?)
(flet ((_opt? (x)
(and (consp x) (eq (car x) 'o)))
(_recur (ac+ o?)
(%parse-args (cdr args) (cons ac+ acum) o?)))
(cond ((null args) (nreverse acum))
((symbolp args)
(nreverse (cons `(:rst ,args) acum)))
((consp args)
(let ((a (car args)))
(cond ((_opt? a)
(_recur `(:opt ,(cadr a) ,(caddr a)) t))
(o? (error "Optional argument followed by non-optional"))
((consp a)
(_recur `(:des ,(%parse-args a)) nil))
((symbolp a)
(_recur `(:nrm ,a) nil))
(t (error "Error parsing args"))))))))
(defun %rebuild-args (args)
(labels ((_rb (a &optional acum)
(if (null a) acum
(_rb (cdr a)
(ecase (caar a)
(:rst (cadar a))
(:nrm (cons (cadar a) acum))
(:opt (cons `(o ,@(cdar a)) acum))
(:des (cons (_rb (reverse (cadar a)))
acum)))))))
(_rb (reverse args))))
(defun %arc-destructure (args sym body)
(let (acum)
(labels ((_ac (x) (push x acum))
(_destr (args curr &optional root?)
(if (null args) nil
(let ((a (car args)))
(ecase (car a)
(:rst (_ac `(,(cadr a) ,curr)))
(:nrm (_ac `(,(cadr a)
(,(if root? '%ecar '%car) ,curr))))
(:opt (_ac `(,(cadr a)
(or (%car ,curr) ,(caddr a)))))
(:des (_destr (cadr a) `(%car ,curr))))
(_destr (cdr args) `(%cdr ,curr) root?)))))
(_destr args sym t)
`(let* (,@(reverse acum))
,@body))))
;;; SBCL specific
(defun backq-fn? (sym)
(member sym
'(sb-impl::backq-list sb-impl::backq-list*
sb-impl::backq-cons sb-impl::backq-comma
sb-impl::backq-append sb-impl::backq-comma-at
sb-impl::backq-comma-dot)))
(defun backq? (e)
(and (consp e)
(backq-fn? (car e))))
;;; Macro expansion + special syntax
(defparameter *cmp-char* #\:)
(defparameter *neg-char* #\~)
(defun %tokens (sepr source tok acc)
(cond ((null source)
(reverse (cons (reverse tok) acc)))
((eq (car source) sepr)
(%tokens sepr (cdr source) nil
(cons (reverse tok) acc)))
(t (%tokens sepr (cdr source) (cons (car source) tok)
acc))))
(defun %ssyntax? (f)
(labels ((_has-char? (str i)
(and (>= i 0)
(or (let ((c (char str i)))
(or (char= c *cmp-char*)
(char= c *neg-char*)))
(_has-char? str (1- i))))))
(and (symbolp f)
(not (or (eq f '+) (eq f '++)))
(let ((nm (symbol-name f)))
(_has-char? nm (1- (length nm)))))))
(defun %expand-syntax (sym)
(labels ((_chars (sym)
(coerce (symbol-name sym) 'list))
(_charsval (chs)
(read-from-string (coerce chs 'string)))
(_exp1 (tok)
(if (eq (car tok) *neg-char*)
`(complement ,(_charsval (cdr tok)))
(_charsval tok))))
(let ((elts (mapcar #'_exp1
(%tokens *cmp-char* (_chars sym)
nil nil))))
(if (null (cdr elts))
(car elts)
(cons 'compose elts)))))
(def-arc-walker (arcmac mac-))
(defun mac-atom (e)
(if (%ssyntax? e)
(arcmac (%expand-syntax e))
e))
(defun mac-quote (e)
`(quote ,@e))
(defun mac-backq (e)
(cons (car e) (mapcar #'arcmac (cdr e))))
(defun mac-if (rest)
`(if ,@(mapcar #'arcmac rest)))
(defun mac-set (e)
(labels ((_1pair (p)
(destructuring-bind (place . val) p
(list (arcmac place) (arcmac val)))))
`(set ,@(mapcan #'_1pair (%parse-pairs e)))))
(defun mac-fn (e)
(let ((arg-list (%parse-args (car e)))
(_body (cdr e)))
(labels ((_warg (a)
(if (eq :opt (car a))
`(:opt ,(cadr a) ,(arcmac (caddr a)))
a)))
`(fn ,(%rebuild-args (mapcar #'_warg arg-list))
,@(mapcar #'arcmac _body)))))
(defun mac-call (head rest)
(flet ((_macro? (x)
(when (symbolp x)
(let ((fn (%symval x)))
(when (%tag? 'mac fn)
(%rep fn))))))
(let ((m (_macro? head)))
(if m
(arcmac (apply m #'identity rest))
(cons (arcmac head)
(mapcar #'arcmac rest))))))
;;; Continuation passing style
(def-arc-walker (%arccps cps-) cc)
(defun arccps (e &optional (cc #'identity))
(%arccps e cc))
(defun %rm-do? (e)
(if (and (consp e) (eq (car e) :do))
(cdr e)
(list e)))
(defun cps-atom (e cc)
(funcall cc e))
(defun cps-quote (e cc)
(funcall cc `(quote ,@e)))
(defun cps-backq (e cc)
(cps-call (car e) (cdr e) cc))
(defun mk-cpssym ()
(gensym "K"))
(defun cpssym? (s)
(and (symbolp s)
(null (symbol-package s))
(char= #\K (char (symbol-name s) 0))))
(defun cps-call (head _rest cc)
(let ((rest (copy-list _rest))
(curr 0))
(labels ((_w/cc? (e)
(or (stringp e)
(and (consp e) (consp (car e)))
(and (consp e) (eq (car e) 'fn))
(and (consp e) (eq (car e) 'quote))
(and (symbolp e)
(not (backq-fn? e))
(not (%prim? e))
(not (cpssym? e)))))
(_next (e)
(setf (nth curr rest) e)
(if (< (incf curr) (length rest))
(arccps (nth curr rest) #'_next)
(cond ((_w/cc? head)
(let ((k (mk-cpssym)))
`(,(arccps head)
(fn (,k) ,@(%rm-do? (funcall cc k)))
,@rest)))
(t (funcall cc `(,(arccps head) ,@rest)))))))
(cond ((eq head :do) (cps-do rest cc))
((null rest)
(if (_w/cc? head)
(let ((k (mk-cpssym)))
`(,(arccps head) (fn (,k) ,@(%rm-do? (funcall cc k)))))
(funcall cc `(,head))))
(t (arccps (car rest) #'_next))))))
(defun cps-do (e cc)
(let ((body e))
(flet ((_next (e)
`(:do ,@(when (not (symbolp e)) (list e))
,@(%rm-do? (arccps `(:do ,@(cdr body)) cc)))))
(if (> (length body) 1)
(arccps (car body) #'_next)
(arccps (car body) cc)))))
(defun cps-fn (e cc)
(let ((args (%parse-args (car e)))
(body (cdr e))
(k (mk-cpssym)))
(funcall cc `(fn (,k ,@(%rebuild-args args))
,@(%rm-do? (arccps `(:do ,@body)
(lambda (_) `(,k ,_))))))))
(defun cps-if (e cc)
(let* ((k1 (mk-cpssym))
(ifcc (lambda (_) `(,k1 ,_))))
(labels ((_if (e)
(destructuring-bind (expr then . else) e
(labels ((_rm-if? (e)
(cond ((null e) nil)
((and (consp e) (eq (car e) 'if))
(cdr e))
(t (list e))))
(_else ()
(cond ((null else) (funcall ifcc nil))
((null (cdr else))
(arccps (car else) ifcc))
(t (_if else))))
(_then (e)
`(if ,e ,(arccps then ifcc)
,@(_rm-if? (_else)))))
(arccps expr #'_then)))))
(let ((k2 (mk-cpssym)))
`((fn (,k1) ,(_if e))
(fn (,k2) ,@(%rm-do? (funcall cc k2))))))))
(defun cps-set (e cc)
(let ((pairs (%parse-pairs e)))
(labels ((_next (e)
(let ((place (caar pairs)))
(cond ((null (cdr pairs))
(funcall cc `(set ,place ,e)))
(t (setf pairs (cdr pairs))
`(:do (set ,place ,e)
,@(%rm-do? (_set)))))))
(_set ()
(arccps (cdar pairs) #'_next)))
(_set))))
;;; Compilation
(def-arc-walker (arcc c-) env)
(defun c-atom (x env)
(flet ((_literal? (a)
(or (null a) (eq a t)
(numberp a)
(stringp a)
(characterp a))))
(cond ((_literal? x) x)
((member x env) x)
(t (%sym x)))))
(defun c-quote (e env)
(declare (ignore env))
`(quote ,@e))
(defun c-backq (e env)
(flet ((_arcc (x) (arcc x env)))
(cons (car e) (mapcar #'_arcc (cdr e)))))
(defun c-if (e env)
(labels ((_if (args)
(cond ((null args) nil)
((null (cdr args)) (arcc (car args) env))
(t `(if ,(arcc (car args) env)
,(arcc (cadr args) env)
,(_if (cddr args)))))))
(_if e)))
(defun c-fn (e env)
(let ((arg-list (%parse-args (car e)))
(_body (cdr e)))
(labels ((_warg-list (args &optional acum)
(if (null args)
(nreverse acum)
(let ((a (car args)))
(if (eq :opt (car a))
(let ((env+ (append (%sym-list acum) env)))
(let ((val (when (caddr a)
(arcc (caddr a) env+))))
(_warg-list (cdr args)
(cons `(:opt ,(cadr a) ,val)
acum))))
(_warg-list (cdr args) (cons a acum))))))
(_normal? ()
(every #'(lambda (x) (eq (car x) :nrm))
arg-list)))
(let* ((syms (%sym-list arg-list))
(body (let ((env+ (append syms env)))
(mapcar #'(lambda (e) (arcc e env+)) _body))))
(if (_normal?)
`(lambda ,syms
,@(when syms `((declare (ignorable ,@syms))))
,@body)
(let ((asym (gensym))
(wargs (_warg-list arg-list nil))
(d+b `((declare (ignorable ,@syms)) ,@body)))
`(lambda (&rest ,asym)
,(%arc-destructure wargs asym d+b))))))))
(defun c-set (e env)
(let ((pairs (%parse-pairs e)))
(labels ((_pair (p)
(destructuring-bind (place . val) p
(let ((v (arcc val env)))
(unless (symbolp place)
(error "First argument to set must be a symbol [~a]"
place))
(if (member place env)
`(setf ,place ,v)
`(setf ,(%sym place) ,v))))))
`(progn ,@(mapcar #'_pair pairs)))))
(defun c-call (head rest env)
(let ((_head (arcc head env))
(_rest (mapcar #'(lambda (e) (arcc e env)) rest)))
(let ((len (length _rest)))
(cond ((%prim? head)
`(,(%sym head) ,@_rest))
((<= 0 len 5)
`(,(%sym (format nil "FUNCALL~a" (1- len))) ,_head ,@_rest))
(t
`($apply ,(car _rest) ,_head (list ,@(cdr _rest))))))))
;;; arcev
;; From: http://paste.lisp.org/display/32712
;; (eval-always
;; (handler-bind ((style-warning #'muffle-warning))
;; (defun x ())))
(defun %arcev (form)
(flet ((_ign-warn (condition)
(declare (ignore condition))
;; Avoid SBCL warnings for global symbols
(muffle-warning)))
(handler-bind ((warning #'_ign-warn))
(eval form))))
(defun arcev (form)
(%arcev (arcc (arccps (arcmac form)) nil)))