[parenscript-devel] defpsmacro has no effect at compile-time

7 Mar 2013

      Hi,

When you use C-c C-k in emacs/SLIME/sbcl produces the output:

"(function () {
     var div1 = createElement(div);
     return null;
})();"

If you do C-C C-k again though, you get the (expected) output:

"(function () {
     var div = document.createElement('DIV');
     return null;
})();"

The problem is (I think) that DEFPSMACRO expands into a PROGN and 
therefore the SETFs have no effect until load time, by which point the 
PS form has already been converted into the string.

If changed to an EVAL-WHEN:

(defmacro defpsmacro (name args &body body)
   (defined-operator-override-check name
       (multiple-value-bind (macro-fn-form effective-lambda-list)
           (make-ps-macro-function args body)
         `(eval-when (:compile-toplevel :load-toplevel :execute)
            (setf (gethash ',name *macro-toplevel*) ,macro-fn-form)
            (setf (gethash ',name *macro-toplevel-lambda-list*) 
',effective-lambda-list)
            ',name))))

Then it compiles as expected the first time as well.

Peter Stirling

Peter Stirling

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