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Discovered arithmetic bug in the Number class, -4 + 5 is coming back as -1, not 1. It's getting the sign wrong somehow. I'll have to hunt that down.
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The command structures will be changed, I think. I want the lexer to actually
lex the command names into tokens, then the parser and the engine can both use
them to update their state when necesarry. It will be less ambiguous and easier
for both sides to stay synchronized.
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At least...those issues are behind us. We'll see what happens next.
Also, added some macros to make debugging easily optional.
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I believe this is because I'm using right tail recursion, but I'm not really
sure how I could change it for this program.
order of operations is being observed perfectly, but then operations are being
performed from right to left, not left to right. I think I may be reducing
too frequently, honestly.
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The main interactive interface doesn't work, and there's a lot left to do with
the unit tests, other command line options, etc. but it's pretty exciting.
I also still have to figure out how commands will work. I'm thinking they'll
be stored in an Expression and executed by the engine as normal.
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