;;; Utils
+(defmacro while (condition &body body)
+ `(do ()
+ ((not ,condition))
+ ,@body))
+
;;; simplify me, please
(defun concat (&rest strs)
(reduce (lambda (s1 s2) (concatenate 'string s1 s2))
strs
:initial-value ""))
+
+(let ((counter 0))
+ (defun make-binding (symbol)
+ (cons symbol (format nil "V_~d" (incf counter)))))
+
+;;; Concatenate a list of strings, with a separator
+(defun join (list separator)
+ (cond
+ ((null list)
+ "")
+ ((null (cdr list))
+ (car list))
+ (t
+ (concat (car list)
+ separator
+ (join (cdr list) separator)))))
+
+
;;; Compiler
(defvar *compilations* nil)
+(defun extend-env (args env)
+ (append (mapcar #'make-binding args) env))
+
+(defun ls-lookup (symbol env)
+ (let ((binding (assoc symbol env)))
+ (if binding
+ (format nil "~a" (cdr binding))
+ (error "Undefined variable `~a'" symbol))))
+
(defmacro define-compilation (name args &body body)
"creates a new primitive `name' with parameters args and @body. The
body can access to the local environment through the variable env"
(ls-compile false env)))
(define-compilation lambda (args &rest body)
- (concat "(function ("
- (format nil "~{V_~a~^, ~}" args)
- "){ "
- (ls-compile-block body (extend-env args env))
- "})
-"))
+ (let ((new-env (extend-env args env)))
+ (concat "(function ("
+ (join (mapcar (lambda (x) (ls-lookup x new-env))
+ args)
+ ",")
+ "){
+"
+ (ls-compile-block body new-env)
+ "
+})")))
-(defun extend-env (args env)
- (append (mapcar #'list args) env))
+(define-compilation setq (var val)
+ (format nil "~a = ~a" (ls-lookup var env) (ls-compile val env)))
+
+(defun lisp->js (sexp)
+ (cond
+ ((integerp sexp) (format nil "~a" sexp))
+ ((stringp sexp) (format nil "\"~a\"" sexp))
+ ((listp sexp) (concat "[" (join (mapcar 'lisp->js sexp) ",") "]"))))
+
+(define-compilation quote (sexp)
+ (lisp->js sexp))
(defparameter *env* '())
(defparameter *env-fun* '())
-
(defun ls-compile (sexp &optional env)
(cond
- ((symbolp sexp) (if (assoc sexp env)
- (format nil "V_~a" sexp)
- (error "Undefined variable `~a'" sexp)))
- ((integerp sexp) (format nil " ~a " sexp))
+ ((symbolp sexp) (ls-lookup sexp env))
+ ((integerp sexp) (format nil "~a" sexp))
((stringp sexp) (format nil " \"~a\" " sexp))
- ; list
+ ; list
((listp sexp)
(let ((compiler-func (second (assoc (car sexp) *compilations*))))
(if compiler-func
)))))
(defun ls-compile-block (sexps env)
- (format nil
- "~{~#[~; return ~a;~:;~a;~%~]~}"
- (mapcar #'(lambda (x)
- (ls-compile x env))
- sexps)))
+ (concat (join (mapcar (lambda (x)
+ (ls-compile x env))
+ (butlast sexps))
+ ";
+")
+ ";
+return " (ls-compile (car (last sexps)) env) ";"))