X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=lispstrack.lisp;h=16be30623c486f7faa810569e26695971397f318;hb=bcee72707404142f5ec8dad6c04e9b802ea8ca0b;hp=794e08244eacbda73080e77169e82a9899d7b9f1;hpb=e78a11426955bc0b933da5da721f3435d6f53020;p=jscl.git

diff --git a/lispstrack.lisp b/lispstrack.lisp
index 794e082..16be306 100644
--- a/lispstrack.lisp
+++ b/lispstrack.lisp
@@ -1,13 +1,198 @@
-(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-block (sexps env fenv)
+  (concat (join (mapcar (lambda (x)
+                          (concat (ls-compile x env fenv) ";"))
+                        sexps)
+                ";
+")))
+
+(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)
+                  ",")
+	    "){
+"
+            (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)
+  (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-block body env fenv)))
+
+(defmacro eval-when-compile (&body body)
+  `(eval-when (:compile-toplevel :execute)
+     ,@body))
+
+(defvar *eval-when-compilations*)
+(define-compilation eval-when-compile (&rest body)
+  (setq *eval-when-compilations* "")
+  (eval (cons 'progn body))
+  (if (string= *eval-when-compilations* "")
+      nil
+      *eval-when-compilations*))
+
+;;; 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) "))"))
+
+
+(defmacro with-eval-when-compilation (&body body)
+  `(setq *eval-when-compilations*
+         (concat *eval-when-compilations* (progn ,@body))))
+
+(defun %compile-defvar (name)
+  (push (make-var-binding name) *env*)
+  (with-eval-when-compilation
+    (format nil "var ~a" (lookup-variable name *env*))))
+
+(defun %compile-defun (name)
+  (push (make-func-binding name) *fenv*)
+  (with-eval-when-compilation
+    (format nil "var ~a" (lookup-variable name *fenv*))))
+
+(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 ls-compile (sexp &optional env fenv)
   (cond
-    ((symbolp sexp) nil)
-    ((integerp sexp) (format nil " ~a " sexp))
-    ((stringp sexp) (format nil " \"~a\" " sexp))
-    ; list
-    ((case (first sexp)
-       (if nil)
-       (lambda nil)
-       (t nil)))))
-
-(defparameter *env-var* '())
-(defparameter *env-fun* '())
+    ((symbolp sexp) (lookup-variable sexp env))
+    ((integerp sexp) (format nil "~a" sexp))
+    ((stringp sexp) (format nil "\"~a\"" sexp))
+    ((listp sexp)
+     (let ((sexp (ls-macroexpand-1 sexp env fenv)))
+       (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)))))))
+
+
+(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)
+         when compilation do (write-line (concat compilation "; ") out)))))
+
+
+;;; Testing
+
+(defun compile-test ()
+  (ls-compile-file "test.lisp" "test.js"))