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#[macro_export]
macro_rules! _probor_enum_pattern {
($name:ident $variant:ident) => {
$name::$variant
};
($name:ident $variant:ident $($fname:ident)* ) => {
$name::$variant ( $(ref $fname),*)
};
}
#[macro_export]
macro_rules! _probor_pattern {
($x:pat) => { $x }
}
#[macro_export]
macro_rules! _probor_encode_pos_enum_field {
($encoder:expr, $idx:expr, $field:ident, $n:tt) => {
_probor_skip_to!($encoder, $idx, $n);
try!($crate::Encodable::encode($field, $encoder));
};
}
#[macro_export]
macro_rules! _probor_decode_variant {
($typ:ident, $dec:expr, $len:expr, $variant:ident) => {{
for _ in 1..$len {
try!($dec.skip().map_err(|e|
$crate::DecodeError::SkippingError(e)));
}
$typ::$variant
}};
($typ:ident, $dec:expr, $len: expr, $variant:ident,
$( $fname:ident $fnum:tt ),+) => {{
$(
let mut $fname = None;
)*
for idx in 1..$len {
match idx {
$(
_probor_pattern!($fnum) => {
$fname = Some(try!(
$crate::Decode::decode_elem($dec, idx)));
}
)*
_ => try!($dec.skip().map_err(|e|
$crate::DecodeError::SkippingError(e))),
}
}
$(
let $fname = try!($fname.ok_or(
$crate::DecodeError::AbsentField(
stringify!(#$fnum))));
)*
$typ::$variant( $( $fname ),* )
}};
}
#[macro_export]
macro_rules! _probor_decode_enum {
($dec:expr, $len:expr, $name:ident { $(
#$n:tt $variant:ident ( $($fname:ident #$fnum:tt),* ),
)* }) => {{
if $len < 1 {
return Err($crate::DecodeError::WrongValue("array too short"));
}
enum Kind {
$( $variant, )*
}
let variant = match $dec.u64() {
$(
Ok(_probor_pattern!($n)) => Kind::$variant,
)*
Ok(_) => return Err($crate::DecodeError::WrongValue(
"unknown enum variant")),
Err($crate::_cbor::DecodeError::UnexpectedType {
datatype: $crate::_cbor::types::Type::Text, info: inf }) => {
let txt = try!(String::from_utf8(
try!($dec.kernel().raw_data(inf, 1 << 31)
.map_err(|e| $crate::DecodeError::WrongType(
"int or text expected as enum kind", e))))
.map_err(|_| $crate::DecodeError::WrongValue(
"enum variant is not correct utf8")));
match &txt[..] {
$(
stringify!($variant) => Kind::$variant,
)*
_ => return Err($crate::DecodeError::WrongValue(
"unknown enum variant")),
}
}
Err(e) => {
return Err($crate::DecodeError::WrongType(
"array expected", e));
}
};
match variant {
$(
Kind::$variant => {
Ok(Some(
_probor_decode_variant!($name, $dec, $len, $variant
$(, $fname $fnum)*)
))
}
)*
}
}}
}
#[macro_export]
macro_rules! probor_enum_encoder_decoder {
($name:ident { $(
#$n:tt $variant:ident ( $($fname:ident #$fnum:tt),* ),
)* }) => {
impl $crate::Encodable for $name {
fn encode<W: $crate::Output>(&self,
e: &mut $crate::_cbor::Encoder<W>)
-> Result<(), $crate::_cbor::EncodeError>
{
match self {
$(
&_probor_enum_pattern!($name $variant $($fname)* ) => {
try!(e.array(_probor_max!( $($fnum,)* ) + 1));
let mut idx = 0;
try!(e.u64($n));
$(
_probor_encode_pos_enum_field!(
e, idx, $fname, $fnum);
)*
(idx += 1, idx);
},
)*
}
Ok(())
}
}
impl $crate::Decodable for $name {
fn decode_opt<R: $crate::Input>(
d: &mut $crate::_cbor::Decoder<R>)
-> Result<Option<Self>, $crate::DecodeError>
{
match d.array() {
Ok(array_len) => {
_probor_decode_enum!(d, array_len, $name { $(
#$n $variant ( $($fname #$fnum),* ),
)* })
}
Err($crate::_cbor::DecodeError::UnexpectedType {
datatype: $crate::_cbor::types::Type::Null, .. }) => {
return Ok(None);
}
Err(e) => {
return Err($crate::DecodeError::WrongType(
"array or object expected (e5)", e));
}
}
}
}
}
}
#[cfg(test)]
mod test_enum {
use {Encodable, Decodable, Encoder, Decoder, Config};
use std::io::Cursor;
use {decode};
fn roundtrip<A:Encodable, B:Decodable>(v: &A) -> B {
let mut e = Encoder::new(Vec::new());
v.encode(&mut e).unwrap();
let v = e.into_writer();
println!("Data {:?} {:?}", String::from_utf8_lossy(&v), v);
let mut d = &mut Decoder::new(Config::default(), Cursor::new(&v[..]));
decode(d).unwrap()
}
#[derive(Debug, PartialEq)]
enum Multi {
One,
Two(u32),
Three(String, u32),
}
probor_enum_encoder_decoder!(Multi {
#0 One(),
#1 Two(x #1),
#5 Three(x #1, y #2),
});
#[test]
fn test() {
use self::Multi::*;
assert_eq!(roundtrip::<_, Multi>(&One), One);
assert_eq!(roundtrip::<_, Multi>(&Two(158)), Two(158));
assert_eq!(roundtrip::<_, Multi>(&Three("test".to_string(), 22)),
Three("test".to_string(), 22));
}
}