scryer-prolog | A modern Prolog implementation written mostly in Rust | Natural Language Processing library
kandi X-RAY | scryer-prolog Summary
kandi X-RAY | scryer-prolog Summary
Scryer Prolog aims to become to ISO Prolog what GHC is to Haskell: an open source industrial strength production environment that is also a testbed for bleeding edge research in logic and constraint programming, which is itself written in a high-level language.
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QUESTION
I wanted to solve "the giant cat army riddle" by Dan Finkel using Prolog.
Basically you start with [0]
, then you build this list by using one of three operations: adding 5
, adding 7
, or taking sqrt
. You successfully complete the game when you have managed to build a list such that 2
,10
and 14
appear on the list, in that order, and there can be other numbers between them.
The rules also require that all the elements are distinct, they're all <=60
and are all only integers.
For example, starting with [0]
, you can apply (add5, add7, add5)
, which would result in [0, 5, 12, 17]
, but since it doesn't have 2,10,14 in that order it doesn't satisfy the game.
I think I have successfully managed to write the required facts, but I can't figure out how to actually build the list. I think using dcg
is a good option for this, but I don't know how.
Here's my code:
...ANSWER
Answered 2021-Jan-07 at 23:18step(Ls) --> [add5(Ls, L)], step(L).
QUESTION
I want to use "ediprolog" package on Emacs. I followed installation and usage instruction here https://www.metalevel.at/ediprolog/ and he says:
The two most important configuration options are:
ediprolog-system, either scryer (default) or swi
ediprolog-program, the path of the Prolog executable.
So I tried C-X , customize-group , ediprolog and checked the configuration file. The files looks like this:
To be honest I have no idea how, where can I edit to add the prolog executable path ~/.cargo/bin/scryer-prolog
. In addition, Emacs says You can't edit this part of the Custom buffer
when I tried to type something on the file.
And as I can expected, when I run ediprolog-dwim
, "view-echo" says ediprolog-run-prolog: No prompt from: scryer-prolog
, probably because I don't set the path on a configuration file.
I'm noob to Emacs and the package also, sorry about that, but I'm really struggling to achieve this step. Your comments must be really helpful for me. Thanks.
...ANSWER
Answered 2020-Oct-12 at 18:51Try adding the path to the exec-path
variable in emacs: when emacs forks off a subshell, this variable is added to the PATH that is passed to the subshell:
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