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use nom::{*};
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use std::str;
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use super::messages::{*, EngineMessage::*, UnsyncedEngineMessage::*, SyncedEngineMessage::*, ConfigEngineMessage::*, KeystrokeAction::*};
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named!(unrecognized_message<&[u8], EngineMessage>,
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do_parse!(rest >> (Unknown))
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);
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named!(string_tail<&[u8], String>, map!(map_res!(rest, str::from_utf8), String::from));
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named!(length_without_timestamp<&[u8], usize>,
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map_opt!(rest_len, |l| if l > 2 { Some(l - 2) } else { None } )
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);
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named!(synced_message<&[u8], SyncedEngineMessage>, alt!(
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do_parse!(tag!("L") >> (Left(Press)))
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));
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named!(timestamped_message<&[u8], (SyncedEngineMessage, u16)>,
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do_parse!(msg: length_value!(length_without_timestamp, synced_message)
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>> timestamp: be_u16
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>> ((msg, timestamp))
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)
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);
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named!(unsynced_message<&[u8], UnsyncedEngineMessage>, alt!(
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do_parse!(tag!("?") >> (Ping))
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| do_parse!(tag!("!") >> (Ping))
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| do_parse!(tag!("esay ") >> s: string_tail >> (Say(s)))
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));
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named!(config_message<&[u8], ConfigEngineMessage>, alt!(
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do_parse!(tag!("C") >> (ConfigRequest))
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));
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named!(unwrapped_message<&[u8], EngineMessage>,
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alt!(
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map!(timestamped_message, |(m, t)| Synced(m, t as u32))
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| do_parse!(tag!("#") >> (Synced(TimeWrap, 65535)))
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| map!(unsynced_message, |m| Unsynced(m))
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| map!(config_message, |m| Config(m))
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| unrecognized_message
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));
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named!(length_specifier<&[u8], u16>, alt!(
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verify!(map!(take!(1), |a : &[u8]| a[0] as u16), |l| l < 64)
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| map!(take!(2), |a| (a[0] as u16 - 64) * 256 + a[1] as u16 + 64)
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)
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);
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named!(empty_message<&[u8], EngineMessage>,
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do_parse!(tag!("\0") >> (Empty))
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);
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named!(non_empty_message<&[u8], EngineMessage>,
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length_value!(length_specifier, unwrapped_message));
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named!(message<&[u8], EngineMessage>, alt!(
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empty_message
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| non_empty_message
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)
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);
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named!(pub extract_messages<&[u8], Vec<EngineMessage> >, many0!(complete!(message)));
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#[test]
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fn parse_length() {
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assert_eq!(length_specifier(b"\x01"), Ok((&b""[..], 1)));
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assert_eq!(length_specifier(b"\x00"), Ok((&b""[..], 0)));
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assert_eq!(length_specifier(b"\x3f"), Ok((&b""[..], 63)));
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assert_eq!(length_specifier(b"\x40\x00"), Ok((&b""[..], 64)));
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assert_eq!(length_specifier(b"\xff\xff"), Ok((&b""[..], 49215)));
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}
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#[test]
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fn parse_synced_messages() {
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assert_eq!(message(b"\x03L\x01\x02"), Ok((&b""[..], Synced(Left(Press), 258))));
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}
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#[test]
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fn parse_unsynced_messages() {
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assert_eq!(message(b"\x0aesay hello"), Ok((&b""[..], Unsynced(Say(String::from("hello"))))));
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}
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#[test]
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fn parse_incorrect_messages() {
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assert_eq!(message(b"\x00"), Ok((&b""[..], Empty)));
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assert_eq!(message(b"\x01\x00"), Ok((&b""[..], Unknown)));
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}
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#[test]
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fn parse_config_messages() {
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assert_eq!(
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message(b"\x01C"),
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Ok((
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&b""[..],
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Config(ConfigRequest)
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))
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);
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}
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#[test]
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fn parse_test_general() {
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assert_eq!(string_tail(b"abc"), Ok((&b""[..], String::from("abc"))));
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}
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