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23 commits

Author SHA1 Message Date
HTG-YT 3646c5e32e handle StmtKind::Rickroll 2021-06-13 13:22:01 +08:00
Alex Bethel 976518a251 Reimplement BF function declaration semantics 2021-06-12 09:26:21 -05:00
Erin 711ad27e00 Basic BfFunctio support 2021-06-11 17:52:47 +02:00
Alex Bethel 41316f5696 Re-enable assignment semantics 2021-06-11 10:05:48 -05:00
Erin 6f16d2594b Added variable assignment to parser 
- Fixed parse error, that `rlyeh` returned HopBack
 2021-06-11 16:59:40 +02:00
Alex Bethel 7d7c1e4a1b Fix interpreter variable persistence bug 2021-06-08 19:21:33 -05:00
Alex Bethel ce20611c07 Fix all 0..0 span placeholders in interpret.rs 2021-06-07 19:57:44 -05:00
Alex Bethel d8f462e0b5 Fix unit tests 2021-06-07 17:35:49 -05:00
Alex Bethel addda8fc87 Remove giant comment block left in by mistake 2021-06-07 16:28:27 -05:00
Alex Bethel 426aee6a2b Repair interpreter after parser changes 2021-06-07 16:20:20 -05:00
Erin 902d8b914c Unified span terminology 
- Add more derivations, because it's required by another parts of project
 2021-06-07 22:21:21 +02:00
Alex Bethel 528de718dc Clean up eval_expr some more 
I keep going back and forth on how I want this block to look :P
Anyway, this is *probably* its final-ish form, until the parser gets
re-written.
 2021-06-02 18:41:20 -05:00
Alex Bethel ce02aebd91 Use impl Value rather than trait BfWriter 
It probably makes more sense to be writing values with
`Value::bf_write` than to go for the complexity of using a trait to
allow `Writer::write_value` (which also looks ambiguous because it's
not immediately clear that a generic name like "write_value" relates
to BF or AbleScript).
 2021-06-02 18:20:30 -05:00
Alex Bethel 326d0511e7 Add Brainfuck functio interpretation 
BF functios can now be declared and called from AbleScript code.
Function parameters supplied from AbleScript are serialized manually
into byte sequences using the `BfWriter` trait, and are available from
BF code using the input operator, `,`.

At the moment, BF functios simply write output to stdout, and are
therefore incapable of communicating results to the rest of the
program; this might change in the future if we can get something close
to pass-by-reference working.
 2021-06-02 15:29:31 -05:00
Alex Bethel 07195d4cf6 Fix panic on arithmetic error 
Divide by zero and add, subtract, or multiply with overflow are all
caught now and reported as an ArithmeticError, rather than causing the
interpreter to panic.
 2021-05-30 13:32:29 -05:00
Alex Bethel acfd81ead2 More thorough unit tests 2021-05-30 13:32:29 -05:00
Alex Bethel 344a11084e Add some unit tests to interpret.rs 
Currently `overflow_should_not_panic` and `variable_persistence` both
fail due to bugs in the interpreter.
 2021-05-30 13:32:29 -05:00
Alex Bethel 585bf2e19f Use single-letter identifiers as base-55 digits 2021-05-29 10:45:39 -05:00
Alex Bethel c906366e3f Improve name & documentation accuracy 
Renamed ControlFlow -> HaltStatus because that's what the enum really
is -- a status on why something halted. Also reviewed `interpret.rs`'s
documentation and fixed a few things that were out of date.
 2021-05-25 21:55:02 -05:00
Alexander Bethel ec81ead3ea Implement break and hopback statements 2021-05-25 21:22:38 -05:00
Alexander Bethel 669f379700 Better abstractions, implement scoping rules 2021-05-25 13:26:01 -05:00
Alexander Bethel 109c77eeb2 Implement more statements 
Added variable declaration, `if` statements, `loop` statements,
variable assignment, and variable banning to go along with
printing (which was already implemented). We still need function
declarations, brainfuck declarations, function calls, and the control
flow operators "break" and "hopback".
 2021-05-24 10:50:26 -05:00
Alexander Bethel eccc00ff81 Implement basic interpreter 
Added code for interpreting parsed AbleScript expressions and
statements, and hooked it up to the REPL.
 2021-05-20 18:18:01 -05:00