331 lines
15 KiB
Common Lisp
331 lines
15 KiB
Common Lisp
(load "match")
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(load "util")
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(defun slice-up-lambda-list (lambda-list)
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(match-automaton lambda-list fixed
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(fixed accept)
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(fixed optional &optional)
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(fixed rest &rest)
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(fixed key &key)
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(fixed aux &aux)
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(fixed reject $&)
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(fixed fixed (:var . $$) var)
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(optional accept)
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(optional rest &rest)
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(optional key &key)
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(optional aux &aux)
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(optional reject $&)
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(optional optional (:var . $$) `(,var nil nil))
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(optional optional (:var $$ :default _? :svar $$?) `(,var ,(car default) ,(car svar)))
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(rest reject $&)
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(rest rest2 (:var . $$) `(,var))
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(rest2 accept)
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(rest2 key &key)
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(rest2 aux &aux)
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(rest2 reject $&)
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(key accept)
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(key other &allow-other-keys t)
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(key aux &aux)
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(key reject $&)
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(key key (:keyword . $k) `(,keyword ,(keyword-to-symbol keyword) nil nil))
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(key key (:var . $$) `(,var ,var nil nil))
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(key key (:keyword $$ :default _? :svar $$?) `(,keyword ,(keyword-to-symbol keyword) ,(car default) ,(car svar)))
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(key key (:var $$ :default _? :svar $$?) `(,var ,var ,(car default) ,(car svar)))
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(key key ((:keyword $k :var $$) :default _? :svar $$?) `(,keyword ,var ,(car default) ,(car svar)))
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(other accept)
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(other aux &aux)
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(other reject $&)
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(aux accept)
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(aux reject $&)
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(aux aux (:var . $$) `(,var nil))
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(aux aux (:var $$ :default _?) `(,var ,(car default)))
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(reject (error "slice-up-lambda-list : ~w ne peut être ici." last-element))))
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;; Exemples :
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;; (slice-up-lambda-list '(a b &optional u &rest c &key ((:foo bar)) :quux (:baz 'glop) &aux (x 1) (y (+ x 2))))
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;; (slice-up-lambda-list '(a b &rest))
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;; (slice-up-lambda-list '(a b))
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(declaim (ftype function mini-meval)) ;; récursion mutuelle mini-meval-params / mini-meval
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(defun mini-meval-params (params global local fixed optional rest key other aux)
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(if fixed
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(if (endp params)
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(error "mini-meval-params : not enough parameters !")
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(mini-meval-params (cdr params) global (acons `(,(car fixed) . variable) (car params) local) (cdr fixed) optional rest key other aux))
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(if optional
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(let* ((var (caar optional))
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(value (if (endp params)
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(mini-meval (cadar optional) global local)
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(car params)))
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(svar (caddar optional))
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(new-local (acons `(,var . variable) value local))
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(new-local-2 (if svar
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(acons `(,svar . variable) (endp params) new-local)
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new-local)))
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(mini-meval-params (cdr params) global new-local-2 nil (cdr optional) rest key other aux))
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(if rest
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(mini-meval-params params global (acons `(,(car rest) . variable) params local) nil nil nil key other aux)
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;; TODO : finir d'implémenter &key &allow-other-keys &aux &rest (et relire CLTL).
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local))))
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; (if key
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; (let* ((keyword (first (car key)))
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; (var (second (car key)))
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; (maybe-val (member keyword params))
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; (maybe-val-2 (if maybe-val
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; (if (n-consp 2 maybe-val)
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; maybe-val
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; (error "mini-meval-params : Nombre de paramètres impair alors qu'il y a &key."))))
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; (svar (fourth (car key)))
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; (new-local (acons `(,var . variable) (if maybe-val-2
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; (cadr maybe-val-2)
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; (mini-meval (third (car key)) global local))
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; local))
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; (new-local-2 (if svar
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; (acons `(,svar . variable) (not (not (maybe-val-2))) new-local)
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; new-local)))
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; (mini-meval-params params global new-local-2 nil nil nil (cdr key) other aux)
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(defun mini-meval-get-params-from-real (etat-global etat-local lambda-list effective-parameters)
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"Lambda-list doit être déjà sliced."
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(funcall #'mini-meval-params effective-parameters etat-global etat-local
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(cdr (assoc 'fixed lambda-list))
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(cdr (assoc 'optional lambda-list))
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(cdr (assoc 'rest lambda-list))
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(cdr (assoc 'key lambda-list))
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(cdr (assoc 'other lambda-list))
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(cdr (assoc 'aux lambda-list))))
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#|
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Mini-meval est un meval très simple destiné à évaluer les macros et les autres directives avec eval-when :compile-toplevel.
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;; Fonctionnement de mini-meval
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Mini-meval sera appellé sur des morceaux spécifiques du fichier source. Il faut donc qu'il puisse maintenir son état entre les appels.
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|#
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(defun mini-meval (expr &optional (etat-global (cons nil nil)) etat-local)
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#|
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L'algorithme d'évaluation est très simple et suit le schéma donné dans CLTL 5.1.3 :
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1) Si l'expression est une forme spéciale, on la traite de manière particulière
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2) Si l'expression est un appel de macro, on évalue le corps de la macro avec les paramètres tels quels (non évalués),
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puis on remplace l'appel par son résutlat, et on évalue ce résultat.
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3) Sinon, c'est un appel de fonction.
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Pour permettre au code de bas niveau de redéfinir les formes spéciales, on fera d'abord la macro-expansion (étape 2).
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|#
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(cond-match
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expr
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((debug :id _?)
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(format t "~&debug :~& id = ~w~& global = ~w~& local = ~w" id etat-global etat-local))
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#| 2) Cas des macros |#
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((:name $$ :params _*)
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(let ((definition (assoc* `(,name . macro) #'equal etat-local (cdr etat-global))))
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(if definition
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#| - Si on a une fonction de ce nom dans l'état-local ou dans l'etat-global, on l'exécute. |#
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(mini-meval (apply (cdr definition) params) etat-global etat-local)
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(else))))
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#| 1) Cas des formes spéciales |#
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((eval-when :situations ($*) :body _*)
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(if (member :execute situations)
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(mini-meval body etat-global etat-local)
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nil))
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((flet ((:name $ :lambda-list @ :fbody _*)*) :body _*)
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(mini-meval `(progn ,body)
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etat-global
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(reduce* etat-local (lambda (new-etat-local name lambda-list fbody)
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(acons `(,name . function)
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(mini-meval `(lamdba ,lambda-list ,@fbody) etat-global etat-local)
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new-etat-local))
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name lambda-list fbody)))
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((labels ((:name $ :lambda-list @ :fbody _*)*) :body _*)
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(let* ((new-bindings (reduce* nil (lambda (new-bindings name) `(((,name . function) . nil) . ,new-bindings))
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name))
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(new-etat-local (append new-bindings etat-local)))
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(mapcar (lambda (name lambda-list fbody)
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;; On fait un assoc / setf dans new-bindings, qui ne contient que les fonctions qu'on vient juste d'ajouter, pour éviter
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;; le risque inexistant de faire une mutation dans etat-local.
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;; TODO : vérifier que ça marche.
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(assoc-set `(,name . function)
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(mini-meval `(lambda ,lambda-list ,@fbody) new-etat-local)
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new-bindings
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#'equal))
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name lambda-list fbody)
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(mini-meval `(progn ,@body) etat-global new-etat-local)))
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((let ((:name $ :value _)*) :body _*)
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(mini-meval `(progn ,@body)
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etat-global
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(reduce* etat-local (lambda (new-etat-local name value)
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(acons `(,name . variable)
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(mini-meval value etat-global etat-local)
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new-etat-local))
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name value)))
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(((? (eq x 'let*)) ((:name $ :value _)*) :body _*)
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(mini-meval `(progn ,@body)
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etat-global
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(reduce* etat-local (lambda (new-etat-local name value)
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(acons `(,name . variable)
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;; Comme let sauf new-etat-local au lieu de etat-local ici.
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(mini-meval value etat-global new-etat-local)
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new-etat-local))
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name value)))
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((macrolet ((:name $ :lambda-list @ :mbody _*)*) :body _*)
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(mini-meval `(progn ,@body)
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etat-global
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(reduce* etat-local (lambda (new-etat-local name lambda-list mbody)
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(acons `(,name . macro)
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;; comme le flet sauf nil au lieu de new-etat-local
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;; CLTL 7.5 :
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;; The precise rule is that the macro-expansion functions defined
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;; by macrolet are defined in the global environment; lexically
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;; scoped entities that would ordinarily be lexically apparent
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;; are not visible within the expansion functions.
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(mini-meval `(lambda ,lambda-list ,@mbody) etat-global nil)
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new-etat-local))
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name lambda-list mbody)))
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((progn :body _*)
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(car (last (mapcar (lambda (expr) (mini-meval expr etat-global etat-local))
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body))))
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((if :condition _ :si-vrai _ :si-faux _?)
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(if (mini-meval condition etat-global etat-local)
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(mini-meval si-vrai etat-global etat-local)
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(if si-faux
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(mini-meval (car si-faux) etat-global etat-local)
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nil)))
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((lambda :lambda-list @ :body _*)
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(let ((sliced-lambda-list (slice-up-lambda-list lambda-list)))
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(lambda (&rest effective-parameters)
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(mini-meval `(progn ,@body)
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etat-global
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(mini-meval-get-params-from-real etat-global etat-local sliced-lambda-list effective-parameters)))))
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((defun :name $ :lambda-list @ :body _*)
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(assoc-set `(,name . function)
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(mini-meval `(lambda ,lambda-list ,@body) etat-global etat-local)
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(cdr etat-global)
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#'equal)
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name)
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((defmacro :name $ :lambda-list @ :body _*)
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(assoc-set `(,name . macro)
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(mini-meval `(lambda ,lambda-list ,@body) etat-global etat-local)
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(cdr etat-global)
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#'equal)
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name)
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((defvar :name $ :value _)
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(assoc-set `(,name . variable)
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(mini-meval value etat-global etat-local)
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(cdr etat-global)
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#'equal)
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name)
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((setf/setq)
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)
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((quote :val _)
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val)
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#| Traitement des appels de fonction |#
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((:lambda (lambda @ _*) :params _*)
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#| - Si c'est une fonction anonyme, on l'exécute. |#
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(apply (mini-meval lambda etat-global etat-local) params))
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((:name $ :params _*)
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(let ((definition (assoc* `(,name . function) #'equal etat-local (cdr etat-global))))
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(if definition
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#| - Si on a une fonction de ce nom dans l'état-local ou dans l'etat-global, on l'exécute. |#
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(apply (cdr definition) (mapcar (lambda (x) (mini-meval x etat-global etat-local)) params))
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(error "mini-meval : undefined function : ~w.~&etat-global = ~w~&etat-local = ~w" name etat-global etat-local))))
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((:name . $$)
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(let ((definition (assoc* `(,name . variable) #'equal etat-local (cdr etat-global))))
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(if definition
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(cdr definition)
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(error "mini-meval : undefined variable : ~w.~&etat-global = ~w~&etat-local = ~w" name etat-global etat-local))))
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((:num . (? numberp))
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num)
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((:str . (? stringp))
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str)
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(()
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nil)))
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(defun push-functions (etat-global functions)
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(cons nil (mapcar-append (cdr etat-global) (lambda (x) `((,x . function) . ,(fdefinition x))) functions)))
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(defmacro etat-global-fn (&rest functions)
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`(push-functions '(nil) ',functions))
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(load "test-unitaire")
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(erase-tests mini-meval)
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(deftestvar mini-meval e-global `(nil ((list . function) . ,#'list) ((+ . function) . ,#'+)))
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(deftest (mini-meval constante)
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(mini-meval 42 e-global nil)
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42)
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(deftest (mini-meval appel-fonction)
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(mini-meval '(+ 2 3) e-global nil)
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5)
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(deftest (mini-meval appel-fonction)
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(mini-meval '(+ 2 (+ 3 4)) e-global nil)
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9)
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(deftest (mini-meval variable)
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(mini-meval 'x e-global (acons '(x . variable) 42 nil))
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42)
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(deftest (mini-meval appel-fonction-et-variable)
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(mini-meval '(+ x x 3) e-global (acons '(x . variable) 42 nil))
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87)
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(deftest (mini-meval appel-fonction-et-variable)
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(mini-meval '(+ x (+ 3 x)) e-global (acons '(x . variable) 42 nil))
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87)
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(deftest (mini-meval lambda extérieur)
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(funcall (mini-meval '(lambda (x) x) e-global nil) 3)
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3)
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(deftest (mini-meval lambda extérieur)
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(funcall (mini-meval '(lambda (x) (+ x 3)) e-global nil) 4)
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7)
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(deftest (mini-meval lambda immédiat)
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(mini-meval '((lambda (x) (+ x 3)) 4) e-global nil)
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7)
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(deftest (mini-meval let)
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(mini-meval '(let ((x 3) (y 4)) (+ x y)) e-global nil)
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7)
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(deftest (mini-meval let)
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(mini-meval '(let ((x 3) (y 4) (z 5)) (let ((z (+ x y)) (w z)) (list x y z w))) e-global nil)
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'(3 4 7 5))
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(deftest (mini-meval let*)
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(mini-meval '(let ((x 3) (y 4) (z 5)) (let* ((z (+ x y)) (w z)) (list x y z w))) e-global nil)
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'(3 4 7 7))
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(deftest (mini-meval progn)
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(mini-meval '(progn 1 2 3 4) e-global nil)
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4)
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(deftest (mini-meval defvar)
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(mini-meval '(progn (defvar x 42) x) e-global nil)
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42)
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(deftest (mini-meval defun)
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(mini-meval '(progn (defun double (x) (+ x x)) (double 3)) e-global nil)
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6)
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(deftest (mini-meval quote)
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(mini-meval ''x e-global nil)
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'x)
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(deftest (mini-meval defmacro)
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(mini-meval '(progn (defmacro qlist (x y) (list 'list (list 'quote x) (list 'quote y))) (qlist a b)) e-global nil)
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'(a b))
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(deftest (mini-meval macrolet)
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(mini-meval '(progn
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(defun qlist (a b) (list a b))
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(list
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(qlist 'a 'b)
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(macrolet ((qlist (x y) (list 'list (list 'quote x) (list 'quote y))))
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(qlist 'a 'b))
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(qlist 'a 'b)))
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e-global nil)
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'((a b) ('a 'b) (a b)))
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