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Fix arithmetic format #892

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Fix arithmetic format #892

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mmatera
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@mmatera mmatera commented Jul 29, 2023

This PR is a first step to improving the way in which arithmetic expressions are formatted. I started trying to fix how DirectedInfinity expressions are formatted, using the standard syntax of WL. However, on each attempt to do that, I collide against the flawed design of our formatting system.
At this point, this is getting large, and still there is a lot of work to do. However, with these changes many expressions are formatted in a closer way than in WMA, and I did some steps in order to disentangle the code.
I will leave this here as a draft for a while.

@mmatera mmatera marked this pull request as draft July 29, 2023 01:27
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. Format[Dice[n_Integer ? (1 <= #1 <= 6&)], OutputForm] = Block[{p = 0.2, r = 0.05}, Graphics[{EdgeForm[Black], White, Rectangle[], Black, EdgeForm[], If[OddQ[n], Disk[{0.5, 0.5}, r]], If[MemberQ[{2, 3, 4, 5, 6}, n], Disk[{p, p}, r]], If[MemberQ[{2, 3, 4, 5, 6}, n], Disk[{Plus[1, Times[-1, p]], Plus[1, Times[-1, p]]}, r]], If[MemberQ[{4, 5, 6}, n], Disk[{p, Plus[1, Times[-1, p]]}, r]], If[MemberQ[{4, 5, 6}, n], Disk[{Plus[1, Times[-1, p]], p}, r]], If[n === 6, {Disk[{p, 0.5}, r], Disk[{Plus[1, Times[-1, p]], 0.5}, r]}]}, ImageSize -> Tiny]]
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This is not perfect, but at least I got something less weird than what we have in master.

# Force parenthesis by adjusting the surrounding context's precedence value,
# We can't change the precedence for the number since it, doesn't
# have a precedence value.
element_prec = 480
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I am pretty sure this is not the right way to fix this. There is always a precedence for all atoms.

@rocky
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rocky commented Jul 30, 2023

You were going to come up with a proof of concept by writing MakeBox in Mathics3.

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