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pub const CHAR_WIDTH: usize = 5;
pub const CHAR_HEIGHT: usize = 6;
fn recognize_letter(
r1: &[bool],
r2: &[bool],
r3: &[bool],
r4: &[bool],
r5: &[bool],
r6: &[bool],
) -> Result<char, String> {
Ok(match (r1, r2, r3, r4, r5, r6) {
(
[false, true, true, false, false],
[true, false, false, true, false],
[true, false, false, true, false],
[true, true, true, true, false],
[true, false, false, true, false],
[true, false, false, true, false],
) => 'A',
(
[true, true, true, false, false],
[true, false, false, true, false],
[true, true, true, false, false],
[true, false, false, true, false],
[true, false, false, true, false],
[true, true, true, false, false],
) => 'B',
(
[false, true, true, false, false],
[true, false, false, true, false],
[true, false, false, false, false],
[true, false, false, false, false],
[true, false, false, true, false],
[false, true, true, false, false],
) => 'C',
(
[true, true, true, true, false],
[true, false, false, false, false],
[true, true, true, false, false],
[true, false, false, false, false],
[true, false, false, false, false],
[true, true, true, true, false],
) => 'E',
(
[true, true, true, true, false],
[true, false, false, false, false],
[true, true, true, false, false],
[true, false, false, false, false],
[true, false, false, false, false],
[true, false, false, false, false],
) => 'F',
(
[false, true, true, false, false],
[true, false, false, true, false],
[true, false, false, false, false],
[true, false, true, true, false],
[true, false, false, true, false],
[false, true, true, true, false],
) => 'G',
(
[true, false, false, true, false],
[true, false, false, true, false],
[true, true, true, true, false],
[true, false, false, true, false],
[true, false, false, true, false],
[true, false, false, true, false],
) => 'H',
(
[false, true, true, true, false],
[false, false, true, false, false],
[false, false, true, false, false],
[false, false, true, false, false],
[false, false, true, false, false],
[false, true, true, true, false],
) => 'I',
(
[false, false, true, true, false],
[false, false, false, true, false],
[false, false, false, true, false],
[false, false, false, true, false],
[true, false, false, true, false],
[false, true, true, false, false],
) => 'J',
(
[true, false, false, true, false],
[true, false, true, false, false],
[true, true, false, false, false],
[true, false, true, false, false],
[true, false, true, false, false],
[true, false, false, true, false],
) => 'K',
(
[true, false, false, false, false],
[true, false, false, false, false],
[true, false, false, false, false],
[true, false, false, false, false],
[true, false, false, false, false],
[true, true, true, true, false],
) => 'L',
(
[false, true, true, false, false],
[true, false, false, true, false],
[true, false, false, true, false],
[true, false, false, true, false],
[true, false, false, true, false],
[false, true, true, false, false],
) => 'O',
(
[true, true, true, false, false],
[true, false, false, true, false],
[true, false, false, true, false],
[true, true, true, false, false],
[true, false, false, false, false],
[true, false, false, false, false],
) => 'P',
(
[true, true, true, false, false],
[true, false, false, true, false],
[true, false, false, true, false],
[true, true, true, false, false],
[true, false, true, false, false],
[true, false, false, true, false],
) => 'R',
(
[false, true, true, true, false],
[true, false, false, false, false],
[true, false, false, false, false],
[false, true, true, false, false],
[false, false, false, true, false],
[true, true, true, false, false],
) => 'S',
(
[true, false, false, true, false],
[true, false, false, true, false],
[true, false, false, true, false],
[true, false, false, true, false],
[true, false, false, true, false],
[false, true, true, false, false],
) => 'U',
(
[true, false, false, false, true],
[true, false, false, false, true],
[false, true, false, true, false],
[false, false, true, false, false],
[false, false, true, false, false],
[false, false, true, false, false],
) => 'Y',
(
[true, true, true, true, false],
[false, false, false, true, false],
[false, false, true, false, false],
[false, true, false, false, false],
[true, false, false, false, false],
[true, true, true, true, false],
) => 'Z',
_ => {
return Err("Unrecognized character".to_string());
}
})
}
pub fn recognize(bytes: &[bool]) -> Result<String, String> {
if bytes.len() % (CHAR_WIDTH * CHAR_HEIGHT) != 0 {
return Err(format!(
"Input length is not a multiple of {}",
CHAR_WIDTH * CHAR_HEIGHT
));
}
let num_letters = bytes.len() / (CHAR_WIDTH * CHAR_HEIGHT);
let all_width = CHAR_WIDTH * num_letters;
let mut result = String::with_capacity(num_letters);
for letter_idx in 0..num_letters {
result.push(recognize_letter(
&bytes[(letter_idx * CHAR_WIDTH)..((letter_idx + 1) * CHAR_WIDTH)],
&bytes[(letter_idx * CHAR_WIDTH + all_width)
..((letter_idx + 1) * CHAR_WIDTH + all_width)],
&bytes[(letter_idx * CHAR_WIDTH + 2 * all_width)
..((letter_idx + 1) * CHAR_WIDTH + 2 * all_width)],
&bytes[(letter_idx * CHAR_WIDTH + 3 * all_width)
..((letter_idx + 1) * CHAR_WIDTH + 3 * all_width)],
&bytes[(letter_idx * CHAR_WIDTH + 4 * all_width)
..((letter_idx + 1) * CHAR_WIDTH + 4 * all_width)],
&bytes[(letter_idx * CHAR_WIDTH + 5 * all_width)
..((letter_idx + 1) * CHAR_WIDTH + 5 * all_width)],
)?);
}
Ok(result)
}