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<trafaret1>
hi there
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<awkravchuk>
Hello. I was wondering, is monkey-patching possible in Racket?
<awkravchuk>
I'll explain. Suppose I want some weird thing called virtual zip filesystem, in which I can manipulate (or, at least, read) files in ZIP archives with usual functions `open-input-file`, `call-with-input-file` etc. as if they were usual local files and zip file itself was a directory. If I were using some other language, I'd go with monkey-patching of basic IO functions that do all of the underlying work to support ZIP archives as folders
<awkravchuk>
. Is this approach feasible in Racket?
<rain1>
you can do that by shadowing, we don't call it monkey patching
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<awkravchuk>
rain1: But would the shadowed version of e.g. `open-input-file` be used by other Racket functions like `call-with-input-file`?
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<rain1>
no you need to redefine call-with-input-file too
<awkravchuk>
All right, I got the idea, thanks
<rain1>
if it was done object oriented then you could just implement the primitives for your object type (zipfs) and the rest would work, but oo coding isn't done often in scheme
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<awkravchuk>
Yeah, right, writing in functional style is much more pleasant than OOP :)
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<rain1>
well I think there is a place for both :)
<rain1>
but i tend to lean towards functional mostly yeah
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<jcowan>
rain1: It's not so much OO, most OO langs have this problem too. It's the lack of machinery for an SPI, a service provider interface, which plugs in to the bottom of something and makes its function accessible to people using the top of it.
<jcowan>
R6RS custom ports are like that.
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<jcowan>
Unfortunately, such things require big-time redefinition, as you say.
<jcowan>
Which is why R7RS will probably not standardize custom ports: they never end up providing all the facilities that the local version of Scheme can do to ports, just a few basics.
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<jcowan>
Instead, I am standardizing on generators/accumulators, which are lightweight and easily layered over many things, including ports.
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<nisstyre>
rain1: OOP is actually very easy and natural in Scheme
<nisstyre>
schemes like Racket have excellent support for dispatching messages, e.g. with thread mailboxes, and pattern matching, and other things
<nisstyre>
people just misunderstand what OOP is and think you need classes and inheritance and a bunch of other stuff
<nisstyre>
I kind of feel like OOP got killed by everyone thinking C++ and Java are great examples of it
<nisstyre>
same with Python
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<jcowan>
nisstyre: The best thing in OO is generic functions IMO
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