diff -r 87f1054c2333 -r ab1ef7074e07 rust/hedgewars-engine-messages/src/parser.rs
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rust/hedgewars-engine-messages/src/parser.rs	Wed Nov 14 11:09:01 2018 +0100
@@ -0,0 +1,91 @@
+use nom::*;
+use std::str;
+
+use super::messages::{*, EngineMessage::*, UnsyncedEngineMessage::*, SyncedEngineMessage::*, ConfigEngineMessage::*, KeystrokeAction::*};
+
+named!(length_specifier<&[u8], u16>, alt!(
+    verify!(map!(take!(1), |a : &[u8]| a[0] as u16), |l| l < 64)
+    | map!(take!(2), |a| (a[0] as u16 - 64) * 256 + a[1] as u16 + 64)
+    )
+);
+
+named!(unrecognized_message<&[u8], EngineMessage>,
+    do_parse!(rest >> (Unknown))
+);
+
+named!(string_tail<&[u8], String>, map!(map_res!(rest, str::from_utf8), String::from));
+
+named!(synced_message<&[u8], SyncedEngineMessage>, alt!(
+      do_parse!(tag!("+l") >> (Left(Press)))
+));
+
+named!(unsynced_message<&[u8], UnsyncedEngineMessage>, alt!(
+      do_parse!(tag!("?") >> (Ping))
+    | do_parse!(tag!("!") >> (Ping))
+    | do_parse!(tag!("esay ") >> s: string_tail  >> (Say(s)))
+));
+
+named!(config_message<&[u8], ConfigEngineMessage>, alt!(
+    do_parse!(tag!("C") >> (ConfigRequest))
+));
+
+named!(empty_message<&[u8], EngineMessage>,
+    do_parse!(tag!("\0") >> (Empty))
+);
+
+named!(non_empty_message<&[u8], EngineMessage>, length_value!(length_specifier,
+    alt!(
+          map!(synced_message, |m| Synced(m, 0))
+        | map!(unsynced_message, |m| Unsynced(m))
+        | map!(config_message, |m| Config(m))
+        | unrecognized_message
+    )
+));
+
+named!(message<&[u8], EngineMessage>, alt!(
+      empty_message
+    | non_empty_message
+    )
+);
+
+named!(pub extract_messages<&[u8], Vec<EngineMessage> >, many0!(complete!(message)));
+
+#[test]
+fn parse_length() {
+    assert_eq!(length_specifier(b"\x01"), Ok((&b""[..], 1)));
+    assert_eq!(length_specifier(b"\x00"), Ok((&b""[..], 0)));
+    assert_eq!(length_specifier(b"\x3f"), Ok((&b""[..], 63)));
+    assert_eq!(length_specifier(b"\x40\x00"), Ok((&b""[..], 64)));
+    assert_eq!(length_specifier(b"\xff\xff"), Ok((&b""[..], 49215)));
+}
+
+#[test]
+fn parse_synced_messages() {
+    assert_eq!(message(b"\x04+l\x01\x01"), Ok((&b""[..], Synced(Left(Press), 0))));
+}
+
+#[test]
+fn parse_unsynced_messages() {
+    assert_eq!(message(b"\x0aesay hello"), Ok((&b""[..], Unsynced(Say(String::from("hello"))))));
+}
+
+#[test]
+fn parse_incorrect_messages() {
+    assert_eq!(message(b"\x00"), Ok((&b""[..], Empty)));
+    assert_eq!(message(b"\x01\x00"), Ok((&b""[..], Unknown)));
+}
+
+#[test]
+fn parse_config_messages() {
+    assert_eq!(
+        message(b"\x01C"),
+        Ok((
+            &b""[..],
+            Config(ConfigRequest)
+        ))
+    );
+}
+#[test]
+fn parse_test_general() {
+    assert_eq!(string_tail(b"abc"), Ok((&b""[..], String::from("abc"))));
+}