(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 ls-compile-sexps (sexps env)
+ (concat (join (mapcar (lambda (x)
+ (concat (ls-compile x env) ";"))
+ sexps)
+ ";
+")))
+
+(defun ls-compile-block (sexps env)
+ (concat (ls-compile-sexps (butlast sexps) env)
+ "return " (ls-compile (car (last sexps)) env) ";"))
+
+
(defun extend-env (args env)
(append (mapcar #'make-binding args) env))
(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"
+ ;; 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 ,@args) ,@body))
*compilations*))
(define-compilation lambda (args &rest body)
(let ((new-env (extend-env args env)))
(concat "(function ("
- (format nil "~{~a~^, ~}" (mapcar
- (lambda (x) (ls-lookup x new-env))
- args))
- "){ "
+ (join (mapcar (lambda (x) (ls-lookup x new-env))
+ args)
+ ",")
+ "){
+"
(ls-compile-block body new-env)
- "})
-")))
+ "
+})")))
(define-compilation setq (var val)
(format nil "~a = ~a" (ls-lookup var env) (ls-compile val env)))
-(define-compilation quote (sexp)
+(defun lisp->js (sexp)
(cond
((integerp sexp) (format nil "~a" sexp))
((stringp sexp) (format nil "\"~a\"" sexp))
- ((listp 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)))
+
+(define-compilation while (pred &rest body)
+ (format nil "(function(){while(~a){~a}})() "
+ (ls-compile pred env)
+ (ls-compile-sexps body env)))
+
+(defmacro eval-when-compile (&body body)
+ `(eval-when (:compile-toplevel :execute)
+ ,@body))
+
+(define-compilation eval-when-compile (when &rest body)
+ (eval body))
+
+;;; aritmetic primitives
+(define-compilation + (x y)
+ (concat "((" (ls-compile x env) ") + (" (ls-compile y env) "))"))
+
+(define-compilation - (x y)
+ (concat "((" (ls-compile x env) ") - (" (ls-compile y env) "))"))
+
+(define-compilation * (x y)
+ (concat "((" (ls-compile x env) ") * (" (ls-compile y env) "))"))
+
+(define-compilation / (x y)
+ (concat "((" (ls-compile x env) ") / (" (ls-compile y env) "))"))
+
+(define-compilation = (x y)
+ (concat "((" (ls-compile x env) ") == (" (ls-compile y env) "))"))
+
(defparameter *env* '())
(defparameter *env-fun* '())
((symbolp sexp) (ls-lookup sexp env))
((integerp sexp) (format nil "~a" sexp))
((stringp sexp) (format nil " \"~a\" " sexp))
- ; list
((listp sexp)
(let ((compiler-func (second (assoc (car sexp) *compilations*))))
(if compiler-func
(apply compiler-func env (cdr sexp))
+ (funcall (ls-compile (car sexp) env) )
;; funcall
)))))
-(defun ls-compile-block (sexps env)
- (format nil
- "~{~#[~; return ~a;~:;~a;~%~]~}"
- (mapcar #'(lambda (x)
- (ls-compile x env))
- sexps)))
+
+;;; 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-string (concat (ls-compile x) "; ") out)))))