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<White_Flame>
hmm, SLIME seems to blow up if the printed result at the REPL is more than 16M chars long?
<White_Flame>
close-connection: The value 34847314 is not of type (UNSIGNED-BYTE 24) when binding COMMON-LISP:LENGTH ...
<White_Flame>
*inferior-lisp* of course has the entire message
<beach>
Very strange. Why would someone limit the value of a variable to 24 bits?
<White_Flame>
the message encoding between processes
<White_Flame>
my code is breaking down a file format into nested a-lists, for a 2.4MB input file, so the output print is pretty big
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<beach>
Oh, I see.
<beach>
Another reason to avoid multiple OS processes.
<beach>
Of course, it is also to easy to crash current Common Lisp implementations entirely, so having the IDE in the same process as the Common Lisp image would require some work on those implementations.
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<ixelp>
Added support for '\x{...} by cage2 · Pull Request #57 · edicl/cl-ppcre · GitHub
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<White_Flame>
this is my old fileformat package I've not released since the code is a spaghetti pile of hacks. But man, it's nice https://plaster.tymoon.eu/view/4687#4687
<White_Flame>
the format can refer to other fields in order to get a count of arrays to decode and stuff like that
<White_Flame>
this particular example is for the old .fli animation format. I have the entire java class file done from years ago as well
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<nil>
cage: not a full review, but just a quick comment: on some implementations, such as ccl, code-char returns nil for characters less than char-code-limit, depending on encoding, but notably UTF-8, e.g. #xd800, so you might want to check for that.
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<cage>
nil: thanks!
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<nil>
White_Flame: That looks potentially quite useful. The hard work of translating obtuse format specs or even reverse engineering is valuable.
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<White_Flame>
yep, but there's an unbounded space of possible field specifications involved
<White_Flame>
and how they depend on other fields declaring their size, or if there's some terminating condition instead of a prefixed length, etc
<White_Flame>
I'd also like it to be able to read/edit/write out files as well, but it's read-only for now
<nil>
yes. i guess complicated compression techniques is rough too
<nil>
unless they're standard as a separate pass
<White_Flame>
for compressed things, I'd have it read out a stream of the various bitfield tags, not necessarily do the decompression itself
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<gilberth>
beach: Thanks for reporting the issue! You found similar issues with the streams chapter iirc. These signatures are a mess indeed.
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<beach>
gilberth: I'll report others if and when I see them.
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<gilberth>
beach: Thanks. Just drop a line here like as you did. Although I'm silent here most of time, I do read backlogs.
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<ixelp>
cl-ppcre/lexer.lisp at add-extended-hex-escape · cage2/cl-ppcre · GitHub
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<citizeno>
Hi! I have been playing around in the Common Lisp type system a bit trying to understand how fast one can determine the type of an object (this is apropos a serialization library I'm poking at to replace my use of cl-store with). I know there must be smart ways to do this. Here
<citizeno>
https://github.com/ajberkley/cl-store-faster/blob/main/type-discrimination.md I described a bit my experiments and working through what you can do with nested typecases to see how many compares are required to figure things out. Poking at the internals of sbcl I see that I can probably get it to do something smarter with jump tables and hashing
<citizeno>
but cannot find the magic incantation and don't really understand the code yet so hoping someone here does?
<ixelp>
cl-store-faster/type-discrimination.md at main · ajberkley/cl-store-faster · GitHub
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<White_Flame>
citizeno: do note that a class tends to be the material implementation, while the type is a predicate on a piece of data that can take an indeterminate amount of time, as it can be a predicate function given an object to test
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<White_Flame>
(reading the link, yeah that's probably already well known :) )
<White_Flame>
if you're going to optimize for SBCL, you should be looking for tests for immediate vs pointer data, and access to type tags
<citizeno>
White_Flame: yeah, satisfies tests are always going to be last on the list to try ... they also might have bugs because they are written by normal folks!
<citizeno>
Yes, that's why one should be testing for fixnum, single-float, cons, and nil first (that was part of why I went about the exercise)
<White_Flame>
(I mean using sb-vm: or sb-int: or whatever internal packages to be poking about its bits for maximum speed
<White_Flame>
and yeah, fixnum first sure smells reasonable to do before the other unsigned-byte tests
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<aeth>
there are other tests other than satisfies that probably become predicates, such as integer ranges
<aeth>
you also have to think e.g. for 3, do you want FIXNUM or do you want (integer 3 3) or do you want something in between (like, say, (unsigned-byte 4) or (unsigned-byte 8))?
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