Subject: Re: On side effects From: "James Clark" <jjc@xxxxxxxxxx> Date: Thu, 19 Jun 1997 11:10:41 +0700 |
> My big concern about modes (first class or otherwise) is that they don't > seem to nest the way I would expect them to: > > (element foo (...) ) > > (mode bar > (element foo (...)) > (element qutz (with-mode baz (process-matching-children "baz")))) > > (mode baz > (element baz (process-matching-children "foo")) > > If I call (with-mode bar) which calls (with-mode baz) I want the > definition for "foo" from "bar". I want construction-rules to overwrite > each other in the "environment" according to nesting. First class modes can help with this: (mode baz (element foo (...)) (element qutz (call-with-mode (merge-mode (with-mode baz (current-mode)) (current-mode)) (lambda () (process-matching-children "baz"))))) James DSSSList info and archive: http://www.mulberrytech.com/dsssl/dssslist
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