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static INPUT: &str = include_str!("input.txt");
#[derive(Copy, Clone)]
enum ParseState {
Verbatim,
Esc,
Hex1,
Hex2
}
fn main() {
let valueified = INPUT.split('\n')
.filter(|s| !s.is_empty());
let (oglen, parsedlen) = valueified.clone()
.map(|s| {
let rs = s.strip_prefix('"').and_then(|s| s.strip_suffix('"')).unwrap();
let mut buf = String::with_capacity(s.len());
let mut state = ParseState::Verbatim;
for c in rs.chars() {
match (state, c) {
(ParseState::Verbatim, '\\') => { state = ParseState::Esc; },
(ParseState::Verbatim, c) => { buf.push(c); },
(ParseState::Esc, 'x') => { state = ParseState::Hex1; },
(ParseState::Esc, c) => { buf.push(c); state = ParseState::Verbatim; },
(ParseState::Hex1, _) => { state = ParseState::Hex2; },
(ParseState::Hex2, _) => { buf.push('?'); state = ParseState::Verbatim; },
}
}
(s, buf)
})
.fold((0, 0), |(a1, b1), (a2, b2)| (a1 + a2.len(), b1 + b2.len()));
let lendiff = oglen - parsedlen;
println!("Literal Length - Parsed Length: {lendiff}");
let (oglen, enclen) = valueified
.map(|s| {
let mut buf = String::with_capacity(s.len() * 2);
buf.push('"');
for c in s.chars() {
match c {
'\\' => { buf += "\\\\" },
'"' => { buf += "\\\"" },
c => { buf.push(c) },
}
}
buf.push('"');
(s, buf)
})
.fold((0, 0), |(a1, b1), (a2, b2)| (a1 + a2.len(), b1 + b2.len()));
let lendiff = enclen - oglen;
println!("Encoded Length - Literal Length: {lendiff}");
}
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