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Logs: liberachat/#haskell

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2021-08-27 00:48:22 <c_wraith> If there are top-level type signatures and you're not doing too much in one place, it tends to be easier to read code than write it
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2021-08-27 00:48:49 <c_wraith> Because you don't need to follow the plumbing details. You can just know the compiler enforced getting it correct
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2021-08-27 01:21:54 <lechner> Hi, sorry it is a bit off-topic: Does anyone know of an extremely simple language/parser for logic expressions? i'm looking for symbols (but no math), conditionals and AND/OR/NOT. Would prefer not to write one. Thanks!
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2021-08-27 01:25:49 <haskl> Has anyone here used cabal-docspec?
2021-08-27 01:25:50 <roboguy_> lechner: does it have to be certain symbols?
2021-08-27 01:27:17 <lechner> they would have meaning (module names)
2021-08-27 01:28:08 <roboguy_> lechner: I mean, do they have to be like certain specific symbols like \/ means AND, etc or does it not really matter what the text of the symbols are?
2021-08-27 01:28:12 <roboguy_> if that makes sense
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2021-08-27 01:30:34 <lechner> roboguy_: they represent exernal logic variables that come from elsewhere, and should be more or less arbitrary text (sans keywords, if needed)
2021-08-27 01:30:41 <roboguy_> if it doesn't really matter, you could probably use Haskell's parser and define a datatype with some infix constructors, etc. You can specify the precendence
2021-08-27 01:31:13 <roboguy_> and then use the derived Read instance
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2021-08-27 01:33:35 <roboguy_> although, if it is external text that comes from elsewhere, that makes me think that it does need to be a certain format? Not sure I understand fully, though
2021-08-27 01:33:35 <lechner> due to Haskell's executable size I probably have use a recursive parser (or maybe a language like rust). i just could not think of a place with more Ph.D.s in mathematics
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2021-08-27 01:34:02 <lechner> i am really looking for a specification, i think
2021-08-27 01:34:47 <lechner> it has to be fast
2021-08-27 01:34:49 <roboguy_> like, you could make a data type like: "data Expr = Expr :&&: Expr | Expr :||: Expr | ... deriving (Read)", specify the fixity and precedence and then the Read instance should parse those expressions for you
2021-08-27 01:35:00 <roboguy_> ah
2021-08-27 01:36:22 <lechner> not that haskell is slow, but this would be for a lower system component in linux dealing with authentication
2021-08-27 01:38:10 <roboguy_> you probably need a specific language in mind to find a parser library for that
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2021-08-27 01:39:12 <roboguy_> searching for "precedence parser" might help you find some libraries (together with a programming language name), though
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2021-08-27 01:41:37 <lechner> i am looking to replace the awful logic of Linux PAM https://serverfault.com/questions/134471/success-n-control-syntax-in-pam-conf-pam-d-files
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2021-08-27 01:51:24 <lechner> maybe something like this https://jsonlogic.com/
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2021-08-27 02:00:25 <dsal> In case anyone's looking to help someone out over on Quora: https://usercontent.irccloud-cdn.com/file/qxOZ9t9C/%CE%BB.png
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2021-08-27 02:06:34 <monochrom> lechner: https://wiki.haskell.org/Parsing_expressions_and_statements shows how to use parsec to parse expressions with very minimal coding as soon as you have decided on operator precedence and associativity. You only need to read up to and including "expression parser", i.e., you can skip "statement parser" (unless you also have statements/commands)
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2021-08-27 02:16:43 <Clint> lechner: i ended up switching to alex/happy for that type of thing, but there's stuff like https://hackage.haskell.org/package/parsers-0.12.10/docs/Text-Parser-Expression.html
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2021-08-27 02:18:26 <pavonia> "approximate phone number" O.o
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2021-08-27 02:26:33 <lechner> monochrom Clint: thanks for the pointers!
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2021-08-27 02:31:37 <arahael> pavonia: My approximate phone number, is +630000000000 :) Accurate to two significant figures!
2021-08-27 02:33:32 <pavonia> That's on the Philippines?
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2021-08-27 03:03:04 <arahael> australia.
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2021-08-27 03:03:32 <arahael> don't know if it includes the phillipines, though. it might.
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