I pushed a refactoring patch (4a55356 - reproduced below) that needs some review.

The idea is that the equality operators don't need to be printed differently from the other operators. They were, in order to allow for a function #'parenthsize-equality to ensure that expressions like (= (= a b) c) and (= a (= b c)) are printed with parenthesized operands. However, as I read the code, there is no possibility that the default operator printer would ever not parenthesize those operands. In other words, the mechanism is superfluous. A further explanation is given in the commit message below.

All the tests pass and I observe no change in the compiled output of our application, but this is still the kind of change that someone should look over.

Daniel

commit 4a55356d6d09715fbd10a01c1b9019e013e42663 Author: Daniel Gackle danielgackle@gmail.com Date: Sun Feb 24 17:09:41 2013 -0700

Refactoring: got rid of PARENTHESIZE-EQUALITY.

There is no need for PARENTHESIZE-EQUALITY as distinct from PRINT-OP-ARGUMENT, because the latter always parenthesizes equality expressions when they are an operand in some other equality expression. (In such a case, OP and ARG-OP have the same precedence, and neither is associative.)

diff --git a/src/printer.lisp b/src/printer.lisp index 348f55a..f07a5b2 100644 --- a/src/printer.lisp +++ b/src/printer.lisp @@ -145,10 +145,8 @@ vice-versa.") (defmethod ps-print ((number number)) (format *psw-stream* (if (integerp number) "~D" "~F") number))

-(defvar %equality-ops '(ps-js:== ps-js:!= ps-js:=== ps-js:!==)) - (let ((precedence-table (make-hash-table :test 'eq))) - (loop for level in `((ps-js:getprop ps-js:aref ps-js:funcall) + (loop for level in '((ps-js:getprop ps-js:aref ps-js:funcall) (ps-js:new) (ps-js:lambda) ;; you won't find this in JS books (ps-js:++ ps-js:-- ps-js:post++ ps-js:post--) @@ -157,7 +155,7 @@ vice-versa.") (ps-js:- ps-js:+) (ps-js:<< ps-js:>> ps-js:>>>) (ps-js:< ps-js:> ps-js:<= ps-js:>= ps-js:instanceof ps-js:in) - ,%equality-ops + (ps-js:== ps-js:!= ps-js:=== ps-js:!==) (ps-js:&) (ps-js:^) (ps-js:|) @@ -218,21 +216,12 @@ vice-versa.") (defprinter ps-js:post-- (x) (ps-print x)"--")

-(defprinter (ps-js:+ ps-js:- ps-js:* ps-js:/ ps-js:% ps-js:&& ps-js:|| ps-js:& ps-js:| ps-js:-= ps-js:+= ps-js:*= ps-js:/= ps-js:%= ps-js:^ ps-js:<< ps-js:>> ps-js:&= ps-js:^= ps-js:|= ps-js:= ps-js:in ps-js:> ps-js:>= ps-js:< ps-js:<=) +(defprinter (ps-js:+ ps-js:- ps-js:* ps-js:/ ps-js:% ps-js:&& ps-js:|| ps-js:& ps-js:| ps-js:-= ps-js:+= ps-js:*= ps-js:/= ps-js:%= ps-js:^ ps-js:<< ps-js:>> ps-js:&= ps-js:^= ps-js:|= ps-js:= ps-js:in ps-js:> ps-js:>= ps-js:< ps-js:<= ps-js:== ps-js:!= ps-js:=== ps-js:!==) (&rest args) (loop for (arg . remaining) on args do (print-op-argument op arg) (when remaining (format *psw-stream* " ~(~A~) " op))))

-(defprinter (ps-js:== ps-js:!= ps-js:=== ps-js:!==) (x y) - (flet ((parenthesize-equality (form) - (if (and (consp form) (member (car form) %equality-ops)) - (parenthesize-print form) - (print-op-argument op form)))) - (parenthesize-equality x) - (format *psw-stream* " ~A " op) - (parenthesize-equality y))) - (defprinter ps-js:aref (array &rest indices) (print-op-argument 'ps-js:aref array) (dolist (idx indices)