-(defun ls-compile (sexp)
+;;; 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-var-binding (symbol)
+ (cons symbol (format nil "v~d" (incf counter)))))
+
+(let ((counter 0))
+ (defun make-func-binding (symbol)
+ (cons symbol (format nil "f~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 ls-compile-sexps (sexps env fenv)
+ (concat (join (mapcar (lambda (x)
+ (concat (ls-compile x env fenv) ";"))
+ sexps)
+ ";
+")))
+
+(defun ls-compile-block (sexps env fenv)
+ (concat (ls-compile-sexps (butlast sexps) env fenv)
+ "return " (ls-compile (car (last sexps)) env fenv) ";"))
+
+
+(defun extend-env (args env)
+ (append (mapcar #'make-var-binding args) env))
+
+(defparameter *env* '())
+(defparameter *fenv* '())
+
+(defun ls-lookup (symbol env)
+ (let ((binding (assoc symbol env)))
+ (and binding (format nil "~a" (cdr binding)))))
+
+(defun lookup-variable (symbol env)
+ (or (ls-lookup symbol env)
+ (ls-lookup symbol *env*)
+ (error "Undefined variable `~a'" symbol)))
+
+(defun lookup-function (symbol env)
+ (or (ls-lookup symbol env)
+ (ls-lookup symbol *fenv*)
+ (error "Undefined function `~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.
+ `(push (list ',name (lambda (env fenv ,@args) ,@body))
+ *compilations*))
+
+(define-compilation if (condition true false)
+ (format nil "((~a)? (~a) : (~a))"
+ (ls-compile condition env fenv)
+ (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)
+ ",")
+ "){
+"
+ (ls-compile-block 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)
+ (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))
+
+(define-compilation debug (form)
+ (format nil "console.log(~a)" (ls-compile form env fenv)))
+
+(define-compilation while (pred &rest body)
+ (format nil "(function(){while(~a){~a}})() "
+ (ls-compile pred env fenv)
+ (ls-compile-sexps body env fenv)))
+
+(defmacro eval-when-compile (&body body)
+ `(eval-when (:compile-toplevel :execute)
+ ,@body))
+
+(define-compilation eval-when-compile (&rest body)
+ (eval (cons 'progn body)))
+
+;;; 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 * (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 = (x y)
+ (concat "((" (ls-compile x env fenv) ") == (" (ls-compile y env fenv) "))"))
+
+
+(defun %compile-defvar (name)
+ (push (make-var-binding name) *env*)
+ (format nil "var ~a" (lookup-variable name *env*)))
+
+(defun %compile-defun (name)
+ (push (make-func-binding name) *fenv*)
+ (format nil "var ~a" (lookup-variable name *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-compile (sexp &optional env fenv)
(cond
- ((symbolp sexp) nil)
+ ((symbolp sexp) (lookup-variable sexp env))
((integerp sexp) (format nil "~a" sexp))
- ; list
- ((case (first sexp)
- (if nil)
- (lambda nil)
- (t nil)))))
-
-(defparameter *env-var* '())
-(defparameter *env-fun* '())
+ ((stringp sexp) (format nil "\"~a\"" sexp))
+ ((listp sexp)
+ (let ((compiler-func (second (assoc (car sexp) *compilations*))))
+ (if compiler-func
+ (apply compiler-func env fenv (cdr sexp))
+ (compile-funcall (car sexp) (cdr sexp) env fenv))))))
+
+
+;;; Testing
+
+(defun compile-test ()
+ (with-open-file (in "test.lisp")
+ (with-open-file (out "test.js" :direction :output :if-exists :supersede)
+ (loop
+ for x = (read in nil) while x
+ do (write-line (concat (ls-compile x) "; ") out)))))