1 files changed, 55 insertions, 0 deletions
diff --git a/2015/rs/code/eight/src/main.rs b/2015/rs/code/eight/src/main.rs
new file mode 100644
index 0000000..b51f436
--- /dev/null
+++ b/2015/rs/code/eight/src/main.rs
@@ -0,0 +1,55 @@
+static INPUT: &'static str = include_str!("input.txt");
+
+#[derive(Copy, Clone)]
+enum ParseState {
+  Verbatim,
+  Esc,
+  Hex1,
+  Hex2(u32)
+}
+
+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, c) => { state = ParseState::Hex2(c.to_digit(16).unwrap() * 16); },
+          (ParseState::Hex2(n), c) => { buf.push(/*char::from_u32(n + c.to_digit(16).unwrap()).unwrap()*/'?'); 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}");
+}