brainfuck interpreter
brainfuck
cli
rust
feat: added tracing
prints the current cell on tape, the value within, the current
instruction the interpreter is on, and where in the instructions the
VM::run function is at*
* although as of right now its just an integer pointing at the tokenized
string, not very useful if you have line breaks and such... still, its
a start!
+24
-12
+24
-12
src/evaluator.rs
+24
-12
src/evaluator.rs
···
1
1
use clap::ValueEnum;
2
2
use std::fmt;
3
+
use std::io::Write;
3
4
4
5
#[derive(Debug)]
5
6
pub enum RuntimeError {
···
271
272
) -> Result<(), RuntimeError> {
272
273
while self.inst_pointer < tokens.len() {
273
274
let current = tokens[self.inst_pointer];
275
+
276
+
if self.tracing {
277
+
std::io::stdout().flush().ok();
278
+
print!(
279
+
"\nTape: {}[{}] ",
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+
self.data_pointer, self.tape[self.data_pointer]
281
+
);
282
+
print!("\nInst: '{}' @ {}", current as char, self.inst_pointer);
283
+
}
284
+
274
285
match current {
275
286
b'>' => {
276
287
self.move_right()?;
···
286
297
}
287
298
288
299
b',' => {
300
+
if self.tracing {
301
+
// std::io::stdout().flush().ok();
302
+
print!("\nInput: ");
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+
std::io::stdout().flush().ok();
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+
}
305
+
289
306
if self.input_type == IOFormat::Ascii {
290
307
self.read_ascii(&mut reader)?;
291
308
} else if self.input_type == IOFormat::Raw {
···
294
311
}
295
312
296
313
b'.' => {
314
+
if self.tracing {
315
+
print!("\nOutput: ")
316
+
}
317
+
297
318
if self.output_type == IOFormat::Ascii {
298
319
self.write_ascii(&mut writer)?;
299
320
} else if self.output_type == IOFormat::Raw {
···
316
337
_ => Err(RuntimeError::InvalidToken(self.inst_pointer))?,
317
338
}
318
339
319
-
// two types of tracing - instruction tracing and tape tracing
320
-
// instruction tracing: prints current instruction being parsed and position its at
321
-
// tape tracing: prints state of tape at that cycle. doesnt print cells containing 0
322
-
// *unless* they've been manipulated before
323
-
324
-
// Cell: 0[24] 1[76] 4[41]
325
-
// Inst: '>' @ char 3
326
-
327
-
// Very long tape? shouldnt print all cells at once, would clog screen
328
-
// perhaps a user option?
329
-
// Cell: ... 13[245] 25[98] 26[41] 31[45] ...
330
-
// Inst: '>' @ char 48
340
+
if self.tracing {
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+
println!();
342
+
}
331
343
332
344
self.inst_pointer += 1;
333
345
}