Fix empty toplevel progn

[jscl.git] / src / compiler-codegen.lisp

diff --git a/src/compiler-codegen.lisp b/src/compiler-codegen.lisp
index f3b05cc..51027fd 100644 (file)
--- a/src/compiler-codegen.lisp
+++ b/src/compiler-codegen.lisp
@@ -22,6 +22,8 @@
 ;;; It is intended to be used with the new compiler. However, it is
 ;;; quite independent so it has been integrated early in JSCL.
 
+(/debug "loading compiler-codegen.lisp!")
+
 (defvar *js-output* t)
 
 ;;; Two seperate functions are needed for escaping strings:
@@ -76,7 +78,7 @@
 
 (defun valid-js-identifier (string-designator)
   (let ((string (typecase string-designator
-                  (symbol (string-downcase (symbol-name string-designator)))
+                  (symbol (symbol-name string-designator))
                   (string string-designator)
                   (t
                    (return-from valid-js-identifier (values nil nil))))))
@@ -152,7 +154,7 @@
       (js-format ",")
       (js-identifier arg)))
   (js-format ")")
-  (js-stmt `(group ,@body)))
+  (js-stmt `(group ,@body) t))
 
 (defun check-lvalue (x)
   (unless (or (symbolp x)
@@ -211,6 +213,9 @@
   (let ((op1 (car args))
         (op2 (cadr args)))
     (case op
+      ;; Transactional compatible operator
+      (code
+       (js-format "~a" (apply #'code args)))
       ;; Function call
       (call
        (js-expr (car args))
@@ -357,84 +362,92 @@
     ((and (consp form) (eq (car form) 'progn))
      (destructuring-bind (&body body) (cdr form)
        (cond
-         ((null body)           '(empty))
-         ((null (cdr body))     (js-expand-stmt (car body)))
-         (t                     `(group ,@(cdr form))))))
+         ((null body)
+          nil)
+         ((null (cdr body))
+          (js-expand-stmt (car body)))
+         (t
+          `(group ,@(cdr form))))))
     (t
      form)))
 
 (defun js-stmt (form &optional parent)
   (let ((form (js-expand-stmt form)))
     (flet ((js-stmt (x) (js-stmt x form)))
-      (if (atom form)
-          (progn
-            (js-expr form)
-            (js-format ";"))
-          (case (car form)
-            (empty
-             (unless (and (consp parent) (eq (car parent) 'group))
-               (js-format ";")))
-            (label
-             (destructuring-bind (label &body body) (cdr form)
-               (js-identifier label)
-               (js-format ":")
-               (js-stmt `(progn ,@body))))
-            (break
-             (destructuring-bind (label) (cdr form)
-               (js-format "break ")
-               (js-identifier label)
+      (cond
+        ((null form)
+         (unless (or (and (consp parent) (eq (car parent) 'group))
+                     (null parent))
+           (js-format ";")))
+        ((atom form)
+         (progn
+           (js-expr form)
+           (js-format ";")))
+        (t
+         (case (car form)
+           (code
+            (js-format "~a" (apply #'code (cdr form))))
+           (label
+            (destructuring-bind (label &body body) (cdr form)
+              (js-identifier label)
+              (js-format ":")
+              (js-stmt `(progn ,@body))))
+           (break
+            (destructuring-bind (label) (cdr form)
+              (js-format "break ")
+              (js-identifier label)
+              (js-format ";")))
+           (return
+             (destructuring-bind (value) (cdr form)
+               (js-format "return ")
+               (js-expr value)
                (js-format ";")))
-            (return
-              (destructuring-bind (value) (cdr form)
-                (js-format "return ")
-                (js-expr value)
-                (js-format ";")))
-            (var
-             (flet ((js-var (spec)
-                      (destructuring-bind (variable &optional initial)
-                          (ensure-list spec)
-                        (js-identifier variable)
-                        (when initial
-                          (js-format "=")
-                          (js-expr initial)))))
-               (destructuring-bind (var &rest vars) (cdr form)
-                 (let ((*js-operator-precedence* 12))
-                   (js-format "var ")
-                   (js-var var)
-                   (dolist (var vars)
-                     (js-format ",")
-                     (js-var var))
-                   (js-format ";")))))
-            (if
-             (destructuring-bind (condition true &optional false) (cdr form)
-               (js-format "if (")
-               (js-expr condition)
-               (js-format ") ")
-               (js-stmt true)
-               (when false
-                 (js-format " else ")
-                 (js-stmt false))))
-            (group
-             (let ((in-group-p
-                    (or (null parent)
-                        (and (consp parent) (eq (car parent) 'group)))))
-               (unless  in-group-p (js-format "{"))
-               (mapc #'js-stmt (cdr form))
-               (unless in-group-p (js-format "}"))))
-            (while
-                (destructuring-bind (condition &body body) (cdr form)
-                  (js-format "while (")
-                  (js-expr condition)
-                  (js-format ")")
-                  (js-stmt `(progn ,@body))))
-            (throw
-                (destructuring-bind (object) (cdr form)
-                  (js-format "throw ")
-                  (js-expr object)
-                  (js-format ";")))
-            (t
-             (js-expr form)
-             (js-format ";")))))))
+           (var
+            (flet ((js-var (spec)
+                     (destructuring-bind (variable &optional initial)
+                         (ensure-list spec)
+                       (js-identifier variable)
+                       (when initial
+                         (js-format "=")
+                         (js-expr initial)))))
+              (destructuring-bind (var &rest vars) (cdr form)
+                (let ((*js-operator-precedence* 12))
+                  (js-format "var ")
+                  (js-var var)
+                  (dolist (var vars)
+                    (js-format ",")
+                    (js-var var))
+                  (js-format ";")))))
+           (if
+            (destructuring-bind (condition true &optional false) (cdr form)
+              (js-format "if (")
+              (js-expr condition)
+              (js-format ") ")
+              (js-stmt true)
+              (when false
+                (js-format " else ")
+                (js-stmt false))))
+           (group
+            (let ((in-group-p
+                   (or (null parent)
+                       (and (consp parent) (eq (car parent) 'group)))))
+              (unless  in-group-p (js-format "{"))
+              (mapc #'js-stmt (cdr form))
+              (unless in-group-p (js-format "}"))))
+           (while
+               (destructuring-bind (condition &body body) (cdr form)
+                 (js-format "while (")
+                 (js-expr condition)
+                 (js-format ")")
+                 (js-stmt `(progn ,@body))))
+           (throw
+               (destructuring-bind (object) (cdr form)
+                 (js-format "throw ")
+                 (js-expr object)
+                 (js-format ";")))
+           (t
+            (js-expr form)
+            (js-format ";"))))))))
 
 (defun js (&rest stmts)
   (mapc #'js-stmt stmts)