(ls-compile true env fenv)
(ls-compile false env fenv)))
-(define-compilation lambda (args &rest body)
- (let ((new-env (extend-env args env)))
- (concat "(function ("
- (join (mapcar (lambda (x) (lookup-variable x new-env))
- args)
- ",")
- "){
+;;; Return the required args of a lambda list
+(defun lambda-list-required-argument (lambda-list)
+ (if (or (null lambda-list) (eq (car lambda-list) '&rest))
+ nil
+ (cons (car lambda-list) (lambda-list-required-argument (cdr lambda-list)))))
+
+(defun lambda-list-rest-argument (lambda-list)
+ (second (member '&rest lambda-list)))
+
+(define-compilation lambda (lambda-list &rest body)
+ (let ((required-arguments (lambda-list-required-argument lambda-list))
+ (rest-argument (lambda-list-rest-argument lambda-list)))
+ (let ((new-env (extend-env (cons rest-argument required-arguments) env)))
+ (concat "(function ("
+ (join (mapcar (lambda (x) (lookup-variable x new-env))
+ required-arguments)
+ ",")
+ "){
"
- (concat (ls-compile-block (butlast body) env fenv)
- "return " (ls-compile (car (last body)) env fenv) ";")
- "
-})")))
+ (if rest-argument
+ (concat "var " (lookup-variable rest-argument new-env)
+ " = arguments.slice("
+ (prin1-to-string (length required-arguments)) ");
+")
+ "")
+
+ (concat (ls-compile-block (butlast body) new-env fenv)
+ "return " (ls-compile (car (last body)) new-env fenv) ";")
+ "
+})"))))
(define-compilation fsetq (var val)
(format nil "~a = ~a" (lookup-function var fenv) (ls-compile val env fenv)))
(define-compilation setq (var val)
(format nil "~a = ~a" (lookup-variable var env) (ls-compile val env fenv)))
-(defun lisp->js (sexp)
+
+;;; Literals
+
+(defvar *literals* '())
+
+(defun literal->js (sexp)
(cond
+ ((null sexp) "undefined")
((integerp sexp) (format nil "~a" sexp))
((stringp sexp) (format nil "\"~a\"" sexp))
- ((listp sexp) (concat "[" (join (mapcar 'lisp->js sexp) ",") "]"))))
+ ((symbolp sexp) (format nil "{name: \"~a\"}" (symbol-name sexp)))
+ ((consp sexp) (concat "{car: "
+ (literal->js (car sexp))
+ ", cdr: "
+ (literal->js (cdr sexp)) "}"))))
+
+(let ((counter 0))
+ (defun literal (form)
+ (let ((var (format nil "l~d" (incf counter))))
+ (push (cons var (literal->js form)) *literals*)
+ var)))
(define-compilation quote (sexp)
- (lisp->js sexp))
+ (literal sexp))
(define-compilation debug (form)
(format nil "console.log(~a)" (ls-compile form env fenv)))
nil
*eval-when-compilations*))
+
+(defmacro define-transformation (name args form)
+ `(define-compilation ,name ,args
+ (ls-compile ,form env fenv)))
+
+(define-transformation progn (&rest body)
+ `((lambda () ,@body)))
+
+(define-transformation let (bindings &rest body)
+ `((lambda ,(mapcar 'car bindings) ,@body)
+ ,@(mapcar 'cadr bindings)))
+
;;; aritmetic primitives
(define-compilation + (x y)
(concat "((" (ls-compile x env fenv) ") + (" (ls-compile y env fenv) "))"))
(define-compilation = (x y)
(concat "((" (ls-compile x env fenv) ") == (" (ls-compile y env fenv) "))"))
+(define-compilation cons (x y)
+ (concat "{car: " (ls-compile x env fenv) ", cdr: " (ls-compile y env fenv) "}"))
+
+(define-compilation car (x)
+ (concat "(" (ls-compile x env fenv) ").car"))
+
+(define-compilation cdr (x)
+ (concat "(" (ls-compile x env fenv) ").cdr"))
+
+(define-compilation symbol-name (x)
+ (concat "(" (ls-compile x env fenv) ").name"))
+
+(define-compilation eq (x y)
+ (concat "(" (ls-compile x env fenv) " === " (ls-compile y env fenv) ")"))
+
+
(defmacro with-eval-when-compilation (&body body)
`(setq *eval-when-compilations*
(defun %compile-defmacro (name lambda)
(push (cons name (cons 'macro lambda)) *fenv*))
-(defun compile-funcall (name args env fenv)
- (format nil "~a(~{~a~^, ~})"
- (lookup-function name fenv)
- (mapcar (lambda (x) (ls-compile x env fenv)) args)))
-
(defun ls-macroexpand-1 (form &optional env fenv)
(let ((function (cdr (assoc (car form) *fenv*))))
(if (and (listp function) (eq (car function) 'macro))
(apply (eval (cdr function)) (cdr form))
form)))
+(defun compile-funcall (function args env fenv)
+ (cond
+ ((symbolp function)
+ (format nil "~a(~{~a~^, ~})"
+ (lookup-function function fenv)
+ (mapcar (lambda (x) (ls-compile x env fenv)) args)))
+ ((and (listp function) (eq (car function) 'lambda))
+ (format nil "(~a)(~{~a~^, ~})"
+ (ls-compile function env fenv)
+ (mapcar (lambda (x) (ls-compile x env fenv)) args)))
+ (t
+ (error "Invalid function designator ~a." function))))
+
(defun ls-compile (sexp &optional env fenv)
(cond
((symbolp sexp) (lookup-variable sexp env))
(apply compiler-func env fenv (cdr sexp))
(compile-funcall (car sexp) (cdr sexp) env fenv)))))))
+(defun ls-compile-toplevel (sexp)
+ (setq *literals* nil)
+ (let ((code (ls-compile sexp)))
+ (prog1
+ (concat (join (mapcar (lambda (lit)
+ (concat "var " (car lit) " = " (cdr lit) ";
+"))
+ *literals*)
+ "")
+ code)
+ (setq *literals* nil))))
+
(defun ls-compile-file (filename output)
(with-open-file (in filename)
(with-open-file (out output :direction :output :if-exists :supersede)
(loop
for x = (read in nil) while x
- for compilation = (ls-compile x)
+ for compilation = (ls-compile-toplevel x)
when compilation do (write-line (concat compilation "; ") out)))))