132 lines
4.8 KiB
Common Lisp
132 lines
4.8 KiB
Common Lisp
;; TODO : reste a gerer les defuns, les let, les lambda expression, les setf, les progn, ...
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(defun lisp2li (expr env)
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"Convertis le code LISP en un code intermédiaire reconnu
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par le compilateur et par l’interpréteur"
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(cond ((and (atom expr) (constantp expr)) ; literaux
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(cons :lit expr))
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((symbolp expr) ; symboles
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(let ((cell (get-binding env expr)))
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(if cell
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(cons :var (car cell))
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(warn "Variable ~S unknown" (car expr)))))
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((and (consp (car expr)) ; λ-expressions
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; => recursion sur arguments
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; => construction environnement
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; => recursion sur corps de la λ-fonction
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(eq 'lambda (caar expr)))
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(error "Lambda expression NYI"))
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((not (symbolp (car expr)))
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(warn "~S isn't a symbol" (car expr)))
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((not (fboundp (car expr)))
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(list :unknown expr env))
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((eq 'if (car expr)) ; if
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(list :if
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(lisp2li (second expr) env)
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(lisp2li (third expr) env)
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(lisp2li (fourth expr) env)))
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((eq 'quote (car expr)) ;; quotes
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(cons :lit (second expr)))
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((eq 'defun (car expr)) ;; TODO : a verifier que le cas de defun est bien gerer comme on le veux
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(cons :call (list 'add-top-level-binding (cons :lclosure (list (length (third expr))
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(lisp2li (fourth expr)
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(make-stat-env (push-new-env env "DEFUN")
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(third expr))))))))
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((eq 'setq (car expr))
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(cons :call (cons 'set-binding (list `(:lit . ,env)
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(cons :lit (second expr))
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(cons :lit (third expr))))))
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((macro-function (car expr))
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(lisp2li (macroexpand-1 expr) env)) ; macros
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((not (special-operator-p (car expr))) ; fonctions normales. (Attention) sur sbcl special-form-p ne marche pas il faut utiliser special-operator-p
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; => recursion sur tous les arguments
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; => eventuellement construction d'environnement
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; => et analyse du corps de la fonction appelee
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(cons :call (cons (first expr) (map-lisp2li (cdr expr) env))))
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(T
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(error "special forme NYI ~S" (car expr)))
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))
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(defun map-lisp2li (expr env)
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(mapcar (lambda (x) (lisp2li x env)) expr))
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(defun make-stat-env (env params) ;; TODO : Verifier si on ne doit pas plutot chercher s'il existe pas deja un environnement avec la valeur et le mettre plutot que nil.
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(mapcar (lambda (x) (add-binding env x nil)) params)
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env)
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;; Test unitaire
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(load "test-unitaire")
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;(erase-tests)
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(deftest lisp2li
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(lisp2li '3 ())
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'(:lit . 3))
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(deftest lisp2li
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(lisp2li ''x ())
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'(:lit . x))
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(deftest lisp2li
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(lisp2li ''(1 2 3) ())
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'(:lit 1 2 3))
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;; test des if
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(deftest lisp2li
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(lisp2li '(if T T nil) ())
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'(:if (:lit . T) (:lit . T) (:lit . nil)))
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(deftest lisp2li
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(lisp2li '(if T nil T) ())
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'(:if (:lit . T) (:lit . nil) (:lit . T)))
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;; test des fonctions predefinies
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(deftest lisp2li
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(lisp2li '(eq 1 1) ())
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'(:call eq (:lit . 1) (:lit . 1)))
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(deftest lisp2li
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(lisp2li '(and 1 1) ())
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'(:lit . 1))
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;; test des variables
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(deftest lisp2li
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(lisp2li 'x '(("TOP-LEVEL" (x . 1) (y . 2))))
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'(:var . x))
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(deftest lisp2li
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(lisp2li '(if (eq x 3) (- x 3) (+ x 3)) '(("TOP-LEVEL" (x . 3))))
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'(:if (:call eq (:var . x) (:lit . 3))
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(:call - (:var . x) (:lit . 3))
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(:call + (:var . x) (:lit . 3))))
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(deftest lisp2li
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(lisp2li '(if (eq x 3)
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(- z 3)
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(- x 5))
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'(("TEST" (z . 5)) ("TOP-LEVEL" (x . 4))))
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'(:IF (:CALL EQ (:VAR . X) (:LIT . 3)) (:CALL - (:VAR . Z) (:LIT . 3))
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(:CALL - (:VAR . X) (:LIT . 5))))
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;; Test avec des expression plus complexe
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(deftest lisp2li
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(lisp2li '(if (eq 1 1) 2 2) ())
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'(:if (:call eq (:lit . 1) (:lit . 1)) (:lit . 2) (:lit . 2)))
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(deftest lisp2li
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(lisp2li '(if (eq "abc" 1) "abc" 2) ())
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'(:IF (:CALL EQ (:LIT . "abc") (:LIT . 1)) (:LIT . "abc") (:LIT . 2)))
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(deftest lisp2li
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(lisp2li '(foo 1 1) ())
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'(:unknown (foo 1 1) ()))
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(deftest lisp2li
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(lisp2li '(if (and (eq 1 1) (= 2 2)) (foo 1 2) (bar 3 4)) ())
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'(:IF (:CALL = (:LIT . 2) (:LIT . 2)) (:UNKNOWN (FOO 1 2) NIL) (:UNKNOWN (BAR 3 4) NIL)))
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;; Test sur le setq
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(deftestvar lisp2li env (add-binding (empty-env-stack) 'x 1))
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(deftest lisp2li
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(lisp2li '(setq x 2) env)
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'(:call set-binding (:lit (("TOP-LEVEL" (x . 1)))) (:lit . x) (:lit . 2)))
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;(run-tests t) |