24 commits

Author	SHA1	Message	Date
Alex Bethel	d1064802ec	Fix unit tests	2021-06-15 11:29:52 -05:00
Alex Bethel	da9ff64486	Make arithmetic errors evaluate to 42	2021-06-12 10:48:44 -05:00
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