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| miasma | hi there, io's still alive? | 21:15 |
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| miasma | this has probably been asked million times, but i was curious about sandboxing some Io program | 21:29 |
| miasma | so I guess a simple way to do that would be to hide the references to the core objects that you want to protect | 21:30 |
| miasma | or use the removeSlots method | 21:30 |
| miasma | but then again, I totally forgot how the imports work in Io. the documents didn't explain it to me. e.g. if I hide Core, how can I still access Date | 21:31 |
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| jer | alright, so io's inheritance model pretty much doesn't allow you (or rather makes it hard to) hide certain things | 22:20 |
| jer | methods aren't copied to subclasses, nor is there any special machinery in the lookup logic to make inheritance works | 22:20 |
| jer | it simply walks the list | 22:20 |
| jer | depth first | 22:20 |
| jer | if you have an object and you say removeSlot("removeSlot") you'll still be able to call removeSlot | 22:21 |
| jer | since your object still inherits from the object which defines it | 22:21 |
| jer | now you could hack a primitive into the runtime on Object that says "ignoreSlot" which will cause the lookup mechanism to fail if the slot being looked up is in that list | 22:21 |
| jer | but it doesn't currently exist | 22:22 |
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| miasma | jer: how about hiding stuff like IO objects? | 23:28 |
| miasma | at the beginning when the VM is up, modify the builtin objects so that all of them lose references to IO stuff | 23:29 |
| miasma | i guess eventually no object refers to IO anymore so it cannot be called | 23:29 |
| miasma | jer: what about the imports? how do they work? i kind of assumed if you e.g. reassign something to Core, the "contents" also disappear | 23:30 |
| miasma | i mean e.g. Data wouldn't be available | 23:31 |
| miasma | in some Java style languages you would do import std.lang.Core; | 23:31 |
| miasma | then import Core.Date; | 23:31 |
| miasma | i tried to manipulate various methods in the Lobby and Object, but a reference to Date still succeeded | 23:32 |
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| miasma | ah nevermind | 23:50 |
| miasma | so there's some circular thing going on | 23:50 |
| miasma | Object -> Lobby -> Protos -> Core -> Object | 23:51 |
| miasma | so yea, basically masking stuff from Core hides it | 23:53 |
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