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by gumby
3314 days ago
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The symbolics accept/present system (part of Dynamic Windows). Unfortunately if you haven't used it, all I couldn't find was Gene Ciccarellis' PhD thesis: https://dspace.mit.edu/bitstream/handle/1721.1/6946/AITR-794... Basically: Lisp supports idempotent type-based printing (print something in a form that can be read back to identify the same object -- basically unremarkable these days; consider python's __repr__ and __string__) as well as human-friendly printing. The presentation system was remarkable in that when you printed an object it printed in the user-friendly form, but when the text was read back the IO system knew what the object was and so acted as if a machine-readable representation had been printed. It also used the type hierarchy to support mouse action in "ordinary" text, thus if you needed a SHAPE object, the mouse would highlight "Square at 4,4" and "Circle centred at 5,5, radius 7" as if it were #<CIRCLE 5,5, r=7>. In fact the "printed" representation need not be textual. Also BSD4.1 sh is quite good one !:... and ^...^ etc were added. As a side note, IIRC Emacs started out as Ciccarelli's TECO init file around '75/76 or so. |
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