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#[derive(Debug, Clone, PartialEq)]
pub enum BrainfuckInstruction {
Add(u8),
Sub(u8),
Right(usize),
Left(usize),
Read,
Write,
Open,
Close,
Set(u8),
ScanLeft,
ScanRight,
}
pub fn parse_str(code: String) -> Vec<BrainfuckInstruction> {
parse(&code.chars().collect::<Vec<char>>())
}
pub fn parse(code: &[char]) -> Vec<BrainfuckInstruction> {
let mut result = Vec::new();
let mut index = 0;
while index < code.len() {
let c = code[index];
index += 1;
match c {
'+' => result.push(BrainfuckInstruction::Add(1)),
'-' => result.push(BrainfuckInstruction::Sub(1)),
'>' => result.push(BrainfuckInstruction::Right(1)),
'<' => result.push(BrainfuckInstruction::Left(1)),
',' => result.push(BrainfuckInstruction::Read),
'.' => result.push(BrainfuckInstruction::Write),
'[' => result.push(BrainfuckInstruction::Open),
']' => result.push(BrainfuckInstruction::Close),
_ => {}
}
}
result
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn parse_str_parses_brainfuck_instructions() {
let code = "++--,.[]<<>> [-]";
let result = parse_str(code.to_string());
assert_eq!(
vec![
BrainfuckInstruction::Add(1),
BrainfuckInstruction::Add(1),
BrainfuckInstruction::Sub(1),
BrainfuckInstruction::Sub(1),
BrainfuckInstruction::Read,
BrainfuckInstruction::Write,
BrainfuckInstruction::Open,
BrainfuckInstruction::Close,
BrainfuckInstruction::Left(1),
BrainfuckInstruction::Left(1),
BrainfuckInstruction::Right(1),
BrainfuckInstruction::Right(1),
BrainfuckInstruction::Open,
BrainfuckInstruction::Sub(1),
BrainfuckInstruction::Close
],
result
);
}
#[test]
fn parse_parses_brainfuck_instructions() {
let code = "++--,.[]<<>> [-]";
let result = parse(&code.chars().collect::<Vec<char>>());
assert_eq!(
vec![
BrainfuckInstruction::Add(1),
BrainfuckInstruction::Add(1),
BrainfuckInstruction::Sub(1),
BrainfuckInstruction::Sub(1),
BrainfuckInstruction::Read,
BrainfuckInstruction::Write,
BrainfuckInstruction::Open,
BrainfuckInstruction::Close,
BrainfuckInstruction::Left(1),
BrainfuckInstruction::Left(1),
BrainfuckInstruction::Right(1),
BrainfuckInstruction::Right(1),
BrainfuckInstruction::Open,
BrainfuckInstruction::Sub(1),
BrainfuckInstruction::Close
],
result
);
}
}