Rewrite crate with serde support from ground up

This commit completely rewrites this crate from the ground up,
supporting serde at the lowest levels as I believe serde support was
intended to do. This is a major change from the previous versions of
this crate, with a summary of changes being:

* Serialization directly to TOML is now supported without going through
  a `Value` first.

* Deserialization directly from TOML is now supported without going
  through a `Value`. Note that due to the TOML format some values still
  are buffered in intermediate memory, but overall this should be at a
  minimum now.

* The API of `Value` was overhauled to match the API of
  `serde_json::Value`. The changes here were to:

  * Add `is_*` accessors
  * Add `get` and `get_mut` for one-field lookups.
  * Implement panicking lookups through `Index`

  The old `index` methods are now gone in favor of `get` and `Index`
  implementations.

* A `Datetime` type has been added to represent a TOML datetime in a
  first-class fashion. Currently this type provides no accessors other
  than a `Display` implementation, but the idea is that this will grow
  support over time for decomposing the date.

* Support for the `rustc-serialize` crate has been dropped, that'll stay
  on the 0.2 and 0.1 release trains.

* This crate no longer supports the detection of unused fields, for that though
  you can use the `serde_ignored` crate on crates.io

3 files changed, 0 insertions, 1309 deletions

diff --git a/src/encoder/mod.rs b/src/encoder/mod.rs
deleted file mode 100644
index 910c970..0000000
--- a/src/encoder/mod.rs
+++ /dev/null
@@ -1,222 +0,0 @@
-use std::collections::BTreeMap;
-use std::error;
-use std::fmt;
-use std::mem;
-
-use {Value, Table};
-
-#[cfg(feature = "rustc-serialize")] mod rustc_serialize;
-#[cfg(feature = "serde")] mod serde;
-
-/// A structure to transform Rust values into TOML values.
-///
-/// This encoder implements the serialization `Encoder` interface, allowing
-/// `Encodable` rust types to be fed into the encoder. The output of this
-/// encoder is a TOML `Table` structure. The resulting TOML can be stringified
-/// if necessary.
-///
-/// # Example
-///
-/// ```
-/// extern crate rustc_serialize;
-/// extern crate toml;
-///
-/// # fn main() {
-/// use toml::{Encoder, Value};
-/// use rustc_serialize::Encodable;
-///
-/// #[derive(RustcEncodable)]
-/// struct MyStruct { foo: isize, bar: String }
-/// let my_struct = MyStruct { foo: 4, bar: "hello!".to_string() };
-///
-/// let mut e = Encoder::new();
-/// my_struct.encode(&mut e).unwrap();
-///
-/// assert_eq!(e.toml.get(&"foo".to_string()), Some(&Value::Integer(4)))
-/// # }
-/// ```
-#[derive(Default, Debug)]
-pub struct Encoder {
-    /// Output TOML that is emitted. The current version of this encoder forces
-    /// the top-level representation of a structure to be a table.
-    ///
-    /// This field can be used to extract the return value after feeding a value
-    /// into this `Encoder`.
-    pub toml: Table,
-    state: State,
-}
-
-/// Enumeration of errors which can occur while encoding a rust value into a
-/// TOML value.
-#[allow(missing_copy_implementations)]
-#[derive(Debug)]
-pub enum Error {
-    /// Indication that a key was needed when a value was emitted, but no key
-    /// was previously emitted.
-    NeedsKey,
-    /// Indication that a key was emitted, but no value was emitted.
-    NoValue,
-    /// Indicates that a map key was attempted to be emitted at an invalid
-    /// location.
-    InvalidMapKeyLocation,
-    /// Indicates that a type other than a string was attempted to be used as a
-    /// map key type.
-    InvalidMapKeyType,
-    /// An error returned whenever a `NaN` value for a float is attempted to be
-    /// encoded
-    NanEncoded,
-    /// An error returned whenever an infinity value for a float is attempted to
-    /// be encoded
-    InfinityEncoded,
-    /// A custom error type was generated
-    Custom(String),
-}
-
-/// Internal state of the encoder when encoding transitions
-#[derive(Debug)]
-pub struct EncoderState {
-    inner: State,
-}
-
-#[derive(PartialEq, Debug)]
-enum State {
-    Start,
-    NextKey(String),
-    NextArray(Vec<Value>),
-    NextMapKey,
-}
-
-impl Default for State {
-    fn default() -> State { State::Start }
-}
-
-impl Encoder {
-    /// Constructs a new encoder which will emit to the given output stream.
-    pub fn new() -> Encoder {
-        Encoder { state: State::Start, toml: BTreeMap::new() }
-    }
-
-    fn emit_value(&mut self, v: Value) -> Result<(), Error> {
-        match v {
-            Value::Float(f) => {
-                if f.is_nan() {
-                    return Err(Error::NanEncoded)
-                }
-                if f.is_infinite() {
-                    return Err(Error::InfinityEncoded)
-                }
-            }
-            _ => {}
-        }
-        match mem::replace(&mut self.state, State::Start) {
-            State::NextKey(key) => { self.toml.insert(key, v); Ok(()) }
-            State::NextArray(mut vec) => {
-                // TODO: validate types
-                vec.push(v);
-                self.state = State::NextArray(vec);
-                Ok(())
-            }
-            State::NextMapKey => {
-                match v {
-                    Value::String(s) => { self.state = State::NextKey(s); Ok(()) }
-                    _ => Err(Error::InvalidMapKeyType)
-                }
-            }
-            _ => Err(Error::NeedsKey)
-        }
-    }
-
-    fn emit_none(&mut self) -> Result<(), Error> {
-        match mem::replace(&mut self.state, State::Start) {
-            State::Start => unreachable!(),
-            State::NextKey(_) => Ok(()),
-            State::NextArray(..) => panic!("how to encode None in an array?"),
-            State::NextMapKey => Err(Error::InvalidMapKeyLocation),
-        }
-    }
-
-    fn seq_begin(&mut self) -> Result<State, Error> {
-        Ok(mem::replace(&mut self.state, State::NextArray(Vec::new())))
-    }
-
-    fn seq_end(&mut self, old: State) -> Result<(), Error> {
-        match mem::replace(&mut self.state, old) {
-            State::NextArray(v) => self.emit_value(Value::Array(v)),
-            _ => unreachable!(),
-        }
-    }
-
-    fn table_key<F>(&mut self, f: F) -> Result<(), Error>
-        where F: FnOnce(&mut Encoder) -> Result<(), Error>
-    {
-        match mem::replace(&mut self.state, State::NextMapKey) {
-            State::Start => {}
-            _ => return Err(Error::InvalidMapKeyLocation),
-        }
-        try!(f(self));
-        match self.state {
-            State::NextKey(_) => Ok(()),
-            _ => Err(Error::InvalidMapKeyLocation),
-        }
-    }
-}
-
-/// Encodes an encodable value into a TOML value.
-///
-/// This function expects the type given to represent a TOML table in some form.
-/// If encoding encounters an error, then this function will fail the task.
-#[cfg(feature = "rustc-serialize")]
-pub fn encode<T: ::rustc_serialize::Encodable>(t: &T) -> Value {
-    let mut e = Encoder::new();
-    t.encode(&mut e).unwrap();
-    Value::Table(e.toml)
-}
-
-/// Encodes an encodable value into a TOML value.
-///
-/// This function expects the type given to represent a TOML table in some form.
-/// If encoding encounters an error, then this function will fail the task.
-#[cfg(all(not(feature = "rustc-serialize"), feature = "serde"))]
-pub fn encode<T: ::serde::Serialize>(t: &T) -> Value {
-    let mut e = Encoder::new();
-    t.serialize(&mut e).unwrap();
-    Value::Table(e.toml)
-}
-
-/// Encodes an encodable value into a TOML string.
-///
-/// This function expects the type given to represent a TOML table in some form.
-/// If encoding encounters an error, then this function will fail the task.
-#[cfg(feature = "rustc-serialize")]
-pub fn encode_str<T: ::rustc_serialize::Encodable>(t: &T) -> String {
-    encode(t).to_string()
-}
-
-/// Encodes an encodable value into a TOML string.
-///
-/// This function expects the type given to represent a TOML table in some form.
-/// If encoding encounters an error, then this function will fail the task.
-#[cfg(all(not(feature = "rustc-serialize"), feature = "serde"))]
-pub fn encode_str<T: ::serde::Serialize>(t: &T) -> String {
-    encode(t).to_string()
-}
-
-impl fmt::Display for Error {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        match *self {
-            Error::NeedsKey => write!(f, "need a key to encode"),
-            Error::NoValue => write!(f, "no value to emit for a previous key"),
-            Error::InvalidMapKeyLocation => write!(f, "a map cannot be emitted \
-                                                       at this location"),
-            Error::InvalidMapKeyType => write!(f, "only strings can be used as \
-                                                   key types"),
-            Error::NanEncoded => write!(f, "cannot encode NaN"),
-            Error::InfinityEncoded => write!(f, "cannot encode infinity"),
-            Error::Custom(ref s) => write!(f, "custom error: {}", s),
-        }
-    }
-}
-
-impl error::Error for Error {
-    fn description(&self) -> &str { "TOML encoding error" }
-}
diff --git a/src/encoder/rustc_serialize.rs b/src/encoder/rustc_serialize.rs
deleted file mode 100644
index 0eda740..0000000
--- a/src/encoder/rustc_serialize.rs
+++ /dev/null
@@ -1,748 +0,0 @@
-use std::mem;
-
-use rustc_serialize;
-use Value;
-use super::{Encoder, Error, State};
-use super::Error::*;
-
-impl Encoder {
-    fn table<F>(&mut self, f: F) -> Result<(), Error>
-        where F: FnOnce(&mut Encoder) -> Result<(), Error>
-    {
-        match mem::replace(&mut self.state, State::Start) {
-            State::NextKey(key) => {
-                let mut nested = Encoder::new();
-                try!(f(&mut nested));
-                self.toml.insert(key, Value::Table(nested.toml));
-                Ok(())
-            }
-            State::NextArray(mut arr) => {
-                let mut nested = Encoder::new();
-                try!(f(&mut nested));
-                arr.push(Value::Table(nested.toml));
-                self.state = State::NextArray(arr);
-                Ok(())
-            }
-            State::Start => f(self),
-            State::NextMapKey => Err(Error::InvalidMapKeyLocation),
-        }
-    }
-
-    fn seq<F>(&mut self, f: F) -> Result<(), Error>
-        where F: FnOnce(&mut Encoder) -> Result<(), Error>
-    {
-        let old = try!(self.seq_begin());
-        try!(f(self));
-        self.seq_end(old)
-    }
-}
-
-impl rustc_serialize::Encoder for Encoder {
-    type Error = Error;
-
-    fn emit_nil(&mut self) -> Result<(), Error> { Ok(()) }
-    fn emit_usize(&mut self, v: usize) -> Result<(), Error> {
-        self.emit_i64(v as i64)
-    }
-    fn emit_u8(&mut self, v: u8) -> Result<(), Error> {
-        self.emit_i64(v as i64)
-    }
-    fn emit_u16(&mut self, v: u16) -> Result<(), Error> {
-        self.emit_i64(v as i64)
-    }
-    fn emit_u32(&mut self, v: u32) -> Result<(), Error> {
-        self.emit_i64(v as i64)
-    }
-    fn emit_u64(&mut self, v: u64) -> Result<(), Error> {
-        self.emit_i64(v as i64)
-    }
-    fn emit_isize(&mut self, v: isize) -> Result<(), Error> {
-        self.emit_i64(v as i64)
-    }
-    fn emit_i8(&mut self, v: i8) -> Result<(), Error> {
-        self.emit_i64(v as i64)
-    }
-    fn emit_i16(&mut self, v: i16) -> Result<(), Error> {
-        self.emit_i64(v as i64)
-    }
-    fn emit_i32(&mut self, v: i32) -> Result<(), Error> {
-        self.emit_i64(v as i64)
-    }
-    fn emit_i64(&mut self, v: i64) -> Result<(), Error> {
-        self.emit_value(Value::Integer(v))
-    }
-    fn emit_bool(&mut self, v: bool) -> Result<(), Error> {
-        self.emit_value(Value::Boolean(v))
-    }
-    fn emit_f32(&mut self, v: f32) -> Result<(), Error> { self.emit_f64(v as f64) }
-    fn emit_f64(&mut self, v: f64) -> Result<(), Error> {
-        self.emit_value(Value::Float(v))
-    }
-    fn emit_char(&mut self, v: char) -> Result<(), Error> {
-        self.emit_str(&v.to_string())
-    }
-    fn emit_str(&mut self, v: &str) -> Result<(), Error> {
-        self.emit_value(Value::String(v.to_string()))
-    }
-    fn emit_enum<F>(&mut self, _name: &str, f: F)
-        -> Result<(), Error>
-        where F: FnOnce(&mut Encoder) -> Result<(), Error>
-    {
-        f(self)
-    }
-    fn emit_enum_variant<F>(&mut self, _v_name: &str, _v_id: usize,
-                            _len: usize, f: F) -> Result<(), Error>
-        where F: FnOnce(&mut Encoder) -> Result<(), Error>
-    {
-        f(self)
-    }
-    fn emit_enum_variant_arg<F>(&mut self, _a_idx: usize, f: F)
-        -> Result<(), Error>
-        where F: FnOnce(&mut Encoder) -> Result<(), Error>
-    {
-        f(self)
-    }
-    fn emit_enum_struct_variant<F>(&mut self, _v_name: &str, _v_id: usize,
-                                   _len: usize,
-                                   _f: F)
-        -> Result<(), Error>
-        where F: FnOnce(&mut Encoder) -> Result<(), Error>
-    {
-        panic!()
-    }
-    fn emit_enum_struct_variant_field<F>(&mut self,
-                                         _f_name: &str,
-                                         _f_idx: usize,
-                                         _f: F)
-        -> Result<(), Error>
-        where F: FnOnce(&mut Encoder) -> Result<(), Error>
-    {
-        panic!()
-    }
-    fn emit_struct<F>(&mut self, _name: &str, _len: usize, f: F)
-        -> Result<(), Error>
-        where F: FnOnce(&mut Encoder) -> Result<(), Error>
-    {
-        self.table(f)
-    }
-    fn emit_struct_field<F>(&mut self, f_name: &str, _f_idx: usize, f: F)
-        -> Result<(), Error>
-        where F: FnOnce(&mut Encoder) -> Result<(), Error>
-    {
-        let old = mem::replace(&mut self.state,
-                               State::NextKey(f_name.to_string()));
-        try!(f(self));
-        if self.state != State::Start {
-            return Err(NoValue)
-        }
-        self.state = old;
-        Ok(())
-    }
-    fn emit_tuple<F>(&mut self, len: usize, f: F)
-        -> Result<(), Error>
-        where F: FnOnce(&mut Encoder) -> Result<(), Error>
-    {
-        self.emit_seq(len, f)
-    }
-    fn emit_tuple_arg<F>(&mut self, idx: usize, f: F)
-        -> Result<(), Error>
-        where F: FnOnce(&mut Encoder) -> Result<(), Error>
-    {
-        self.emit_seq_elt(idx, f)
-    }
-    fn emit_tuple_struct<F>(&mut self, _name: &str, _len: usize, _f: F)
-        -> Result<(), Error>
-        where F: FnOnce(&mut Encoder) -> Result<(), Error>
-    {
-        unimplemented!()
-    }
-    fn emit_tuple_struct_arg<F>(&mut self, _f_idx: usize, _f: F)
-        -> Result<(), Error>
-        where F: FnOnce(&mut Encoder) -> Result<(), Error>
-    {
-        unimplemented!()
-    }
-    fn emit_option<F>(&mut self, f: F)
-        -> Result<(), Error>
-        where F: FnOnce(&mut Encoder) -> Result<(), Error>
-    {
-        f(self)
-    }
-    fn emit_option_none(&mut self) -> Result<(), Error> {
-        self.emit_none()
-    }
-    fn emit_option_some<F>(&mut self, f: F) -> Result<(), Error>
-        where F: FnOnce(&mut Encoder) -> Result<(), Error>
-    {
-        f(self)
-    }
-    fn emit_seq<F>(&mut self, _len: usize, f: F)
-        -> Result<(), Error>
-        where F: FnOnce(&mut Encoder) -> Result<(), Error>
-    {
-        self.seq(f)
-    }
-    fn emit_seq_elt<F>(&mut self, _idx: usize, f: F)
-        -> Result<(), Error>
-        where F: FnOnce(&mut Encoder) -> Result<(), Error>
-    {
-        f(self)
-    }
-    fn emit_map<F>(&mut self, len: usize, f: F)
-        -> Result<(), Error>
-        where F: FnOnce(&mut Encoder) -> Result<(), Error>
-    {
-        self.emit_struct("foo", len, f)
-    }
-    fn emit_map_elt_key<F>(&mut self, _idx: usize, f: F) -> Result<(), Error>
-        where F: FnOnce(&mut Encoder) -> Result<(), Error>
-    {
-        self.table_key(f)
-    }
-    fn emit_map_elt_val<F>(&mut self, _idx: usize, f: F) -> Result<(), Error>
-        where F: FnOnce(&mut Encoder) -> Result<(), Error>
-    {
-        f(self)
-    }
-}
-
-impl rustc_serialize::Encodable for Value {
-    fn encode<E>(&self, e: &mut E) -> Result<(), E::Error>
-        where E: rustc_serialize::Encoder
-    {
-        match *self {
-            Value::String(ref s) => e.emit_str(s),
-            Value::Integer(i) => e.emit_i64(i),
-            Value::Float(f) => e.emit_f64(f),
-            Value::Boolean(b) => e.emit_bool(b),
-            Value::Datetime(ref s) => e.emit_str(s),
-            Value::Array(ref a) => {
-                e.emit_seq(a.len(), |e| {
-                    for item in a {
-                        try!(item.encode(e));
-                    }
-                    Ok(())
-                })
-            }
-            Value::Table(ref t) => {
-                e.emit_map(t.len(), |e| {
-                    for (i, (key, value)) in t.iter().enumerate() {
-                        try!(e.emit_map_elt_key(i, |e| e.emit_str(key)));
-                        try!(e.emit_map_elt_val(i, |e| value.encode(e)));
-                    }
-                    Ok(())
-                })
-            }
-        }
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use std::collections::{BTreeMap, HashSet};
-    use rustc_serialize::{self, Encodable, Decodable};
-
-    use {Encoder, Decoder, DecodeError};
-    use Value;
-    use Value::{Table, Integer, Array, Float};
-
-    macro_rules! encode( ($t:expr) => ({
-        let mut e = Encoder::new();
-        $t.encode(&mut e).unwrap();
-        e.toml
-    }) );
-
-    macro_rules! decode( ($t:expr) => ({
-        let mut d = Decoder::new($t);
-        Decodable::decode(&mut d).unwrap()
-    }) );
-
-    macro_rules! map( ($($k:ident, $v:expr),*) => ({
-        let mut _m = BTreeMap::new();
-        $(_m.insert(stringify!($k).to_string(), $v);)*
-        _m
-    }) );
-
-    #[test]
-    fn smoke() {
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Foo { a: isize }
-
-        let v = Foo { a: 2 };
-        assert_eq!(encode!(v), map! { a, Integer(2) });
-        assert_eq!(v, decode!(Table(encode!(v))));
-    }
-
-    #[test]
-    fn smoke_hyphen() {
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Foo { a_b: isize }
-
-        let v = Foo { a_b: 2 };
-        assert_eq!(encode!(v), map! { a_b, Integer(2) });
-        assert_eq!(v, decode!(Table(encode!(v))));
-
-        let mut m = BTreeMap::new();
-        m.insert("a-b".to_string(), Integer(2));
-        assert_eq!(v, decode!(Table(encode!(v))));
-    }
-
-    #[test]
-    fn nested() {
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Foo { a: isize, b: Bar }
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Bar { a: String }
-
-        let v = Foo { a: 2, b: Bar { a: "test".to_string() } };
-        assert_eq!(encode!(v),
-                   map! {
-                       a, Integer(2),
-                       b, Table(map! {
-                           a, Value::String("test".to_string())
-                       })
-                   });
-        assert_eq!(v, decode!(Table(encode!(v))));
-    }
-
-    #[test]
-    fn application_decode_error() {
-        #[derive(PartialEq, Debug)]
-        struct Range10(usize);
-        impl Decodable for Range10 {
-             fn decode<D: rustc_serialize::Decoder>(d: &mut D) -> Result<Range10, D::Error> {
-                 let x: usize = try!(Decodable::decode(d));
-                 if x > 10 {
-                     Err(d.error("Value out of range!"))
-                 } else {
-                     Ok(Range10(x))
-                 }
-             }
-        }
-        let mut d_good = Decoder::new(Integer(5));
-        let mut d_bad1 = Decoder::new(Value::String("not an isize".to_string()));
-        let mut d_bad2 = Decoder::new(Integer(11));
-
-        assert_eq!(Ok(Range10(5)), Decodable::decode(&mut d_good));
-
-        let err1: Result<Range10, _> = Decodable::decode(&mut d_bad1);
-        assert!(err1.is_err());
-        let err2: Result<Range10, _> = Decodable::decode(&mut d_bad2);
-        assert!(err2.is_err());
-    }
-
-    #[test]
-    fn array() {
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Foo { a: Vec<isize> }
-
-        let v = Foo { a: vec![1, 2, 3, 4] };
-        assert_eq!(encode!(v),
-                   map! {
-                       a, Array(vec![
-                            Integer(1),
-                            Integer(2),
-                            Integer(3),
-                            Integer(4)
-                       ])
-                   });
-        assert_eq!(v, decode!(Table(encode!(v))));
-    }
-
-    #[test]
-    fn tuple() {
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Foo { a: (isize, isize, isize, isize) }
-
-        let v = Foo { a: (1, 2, 3, 4) };
-        assert_eq!(encode!(v),
-                   map! {
-                       a, Array(vec![
-                            Integer(1),
-                            Integer(2),
-                            Integer(3),
-                            Integer(4)
-                       ])
-                   });
-        assert_eq!(v, decode!(Table(encode!(v))));
-    }
-
-    #[test]
-    fn inner_structs_with_options() {
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Foo {
-            a: Option<Box<Foo>>,
-            b: Bar,
-        }
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Bar {
-            a: String,
-            b: f64,
-        }
-
-        let v = Foo {
-            a: Some(Box::new(Foo {
-                a: None,
-                b: Bar { a: "foo".to_string(), b: 4.5 },
-            })),
-            b: Bar { a: "bar".to_string(), b: 1.0 },
-        };
-        assert_eq!(encode!(v),
-                   map! {
-                       a, Table(map! {
-                           b, Table(map! {
-                               a, Value::String("foo".to_string()),
-                               b, Float(4.5)
-                           })
-                       }),
-                       b, Table(map! {
-                           a, Value::String("bar".to_string()),
-                           b, Float(1.0)
-                       })
-                   });
-        assert_eq!(v, decode!(Table(encode!(v))));
-    }
-
-    #[test]
-    fn hashmap() {
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Foo {
-            map: BTreeMap<String, isize>,
-            set: HashSet<char>,
-        }
-
-        let v = Foo {
-            map: {
-                let mut m = BTreeMap::new();
-                m.insert("foo".to_string(), 10);
-                m.insert("bar".to_string(), 4);
-                m
-            },
-            set: {
-                let mut s = HashSet::new();
-                s.insert('a');
-                s
-            },
-        };
-        assert_eq!(encode!(v),
-            map! {
-                map, Table(map! {
-                    foo, Integer(10),
-                    bar, Integer(4)
-                }),
-                set, Array(vec![Value::String("a".to_string())])
-            }
-        );
-        assert_eq!(v, decode!(Table(encode!(v))));
-    }
-
-    #[test]
-    fn tuple_struct() {
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Foo(isize, String, f64);
-
-        let v = Foo(1, "foo".to_string(), 4.5);
-        assert_eq!(
-            encode!(v),
-            map! {
-                _field0, Integer(1),
-                _field1, Value::String("foo".to_string()),
-                _field2, Float(4.5)
-            }
-        );
-        assert_eq!(v, decode!(Table(encode!(v))));
-    }
-
-    #[test]
-    fn table_array() {
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Foo { a: Vec<Bar>, }
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Bar { a: isize }
-
-        let v = Foo { a: vec![Bar { a: 1 }, Bar { a: 2 }] };
-        assert_eq!(
-            encode!(v),
-            map! {
-                a, Array(vec![
-                    Table(map!{ a, Integer(1) }),
-                    Table(map!{ a, Integer(2) }),
-                ])
-            }
-        );
-        assert_eq!(v, decode!(Table(encode!(v))));
-    }
-
-    #[test]
-    fn type_errors() {
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Foo { bar: isize }
-
-        let mut d = Decoder::new(Table(map! {
-            bar, Float(1.0)
-        }));
-        let a: Result<Foo, DecodeError> = Decodable::decode(&mut d);
-        match a {
-            Ok(..) => panic!("should not have decoded"),
-            Err(e) => {
-                assert_eq!(e.to_string(),
-                           "expected a value of type `integer`, but \
-                            found a value of type `float` for the key `bar`");
-            }
-        }
-    }
-
-    #[test]
-    fn missing_errors() {
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Foo { bar: isize }
-
-        let mut d = Decoder::new(Table(map! {
-        }));
-        let a: Result<Foo, DecodeError> = Decodable::decode(&mut d);
-        match a {
-            Ok(..) => panic!("should not have decoded"),
-            Err(e) => {
-                assert_eq!(e.to_string(),
-                           "expected a value of type `integer` for the key `bar`");
-            }
-        }
-    }
-
-    #[test]
-    fn parse_enum() {
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Foo { a: E }
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        enum E {
-            Bar(isize),
-            Baz(f64),
-            Last(Foo2),
-        }
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Foo2 {
-            test: String,
-        }
-
-        let v = Foo { a: E::Bar(10) };
-        assert_eq!(
-            encode!(v),
-            map! { a, Integer(10) }
-        );
-        assert_eq!(v, decode!(Table(encode!(v))));
-
-        let v = Foo { a: E::Baz(10.2) };
-        assert_eq!(
-            encode!(v),
-            map! { a, Float(10.2) }
-        );
-        assert_eq!(v, decode!(Table(encode!(v))));
-
-        let v = Foo { a: E::Last(Foo2 { test: "test".to_string() }) };
-        assert_eq!(
-            encode!(v),
-            map! { a, Table(map! { test, Value::String("test".to_string()) }) }
-        );
-        assert_eq!(v, decode!(Table(encode!(v))));
-    }
-
-    #[test]
-    fn unused_fields() {
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Foo { a: isize }
-
-        let v = Foo { a: 2 };
-        let mut d = Decoder::new(Table(map! {
-            a, Integer(2),
-            b, Integer(5)
-        }));
-        assert_eq!(v, Decodable::decode(&mut d).unwrap());
-
-        assert_eq!(d.toml, Some(Table(map! {
-            b, Integer(5)
-        })));
-    }
-
-    #[test]
-    fn unused_fields2() {
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Foo { a: Bar }
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Bar { a: isize }
-
-        let v = Foo { a: Bar { a: 2 } };
-        let mut d = Decoder::new(Table(map! {
-            a, Table(map! {
-                a, Integer(2),
-                b, Integer(5)
-            })
-        }));
-        assert_eq!(v, Decodable::decode(&mut d).unwrap());
-
-        assert_eq!(d.toml, Some(Table(map! {
-            a, Table(map! {
-                b, Integer(5)
-            })
-        })));
-    }
-
-    #[test]
-    fn unused_fields3() {
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Foo { a: Bar }
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Bar { a: isize }
-
-        let v = Foo { a: Bar { a: 2 } };
-        let mut d = Decoder::new(Table(map! {
-            a, Table(map! {
-                a, Integer(2)
-            })
-        }));
-        assert_eq!(v, Decodable::decode(&mut d).unwrap());
-
-        assert_eq!(d.toml, None);
-    }
-
-    #[test]
-    fn unused_fields4() {
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Foo { a: BTreeMap<String, String> }
-
-        let v = Foo { a: map! { a, "foo".to_string() } };
-        let mut d = Decoder::new(Table(map! {
-            a, Table(map! {
-                a, Value::String("foo".to_string())
-            })
-        }));
-        assert_eq!(v, Decodable::decode(&mut d).unwrap());
-
-        assert_eq!(d.toml, None);
-    }
-
-    #[test]
-    fn unused_fields5() {
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Foo { a: Vec<String> }
-
-        let v = Foo { a: vec!["a".to_string()] };
-        let mut d = Decoder::new(Table(map! {
-            a, Array(vec![Value::String("a".to_string())])
-        }));
-        assert_eq!(v, Decodable::decode(&mut d).unwrap());
-
-        assert_eq!(d.toml, None);
-    }
-
-    #[test]
-    fn unused_fields6() {
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Foo { a: Option<Vec<String>> }
-
-        let v = Foo { a: Some(vec![]) };
-        let mut d = Decoder::new(Table(map! {
-            a, Array(vec![])
-        }));
-        assert_eq!(v, Decodable::decode(&mut d).unwrap());
-
-        assert_eq!(d.toml, None);
-    }
-
-    #[test]
-    fn unused_fields7() {
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Foo { a: Vec<Bar> }
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Bar { a: isize }
-
-        let v = Foo { a: vec![Bar { a: 1 }] };
-        let mut d = Decoder::new(Table(map! {
-            a, Array(vec![Table(map! {
-                a, Integer(1),
-                b, Integer(2)
-            })])
-        }));
-        assert_eq!(v, Decodable::decode(&mut d).unwrap());
-
-        assert_eq!(d.toml, Some(Table(map! {
-            a, Array(vec![Table(map! {
-                b, Integer(2)
-            })])
-        })));
-    }
-
-    #[test]
-    fn unused_fields8() {
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Foo { a: BTreeMap<String, Bar> }
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Bar { a: isize }
-
-        let v = Foo { a: map! { a, Bar { a: 2 } } };
-        let mut d = Decoder::new(Table(map! {
-            a, Table(map! {
-                a, Table(map! {
-                    a, Integer(2),
-                    b, Integer(2)
-                })
-            })
-        }));
-        assert_eq!(v, Decodable::decode(&mut d).unwrap());
-
-        assert_eq!(d.toml, Some(Table(map! {
-            a, Table(map! {
-                a, Table(map! {
-                    b, Integer(2)
-                })
-            })
-        })));
-    }
-
-    #[test]
-    fn empty_arrays() {
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Foo { a: Vec<Bar> }
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Bar;
-
-        let v = Foo { a: vec![] };
-        let mut d = Decoder::new(Table(map! {}));
-        assert_eq!(v, Decodable::decode(&mut d).unwrap());
-    }
-
-    #[test]
-    fn empty_arrays2() {
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Foo { a: Option<Vec<Bar>> }
-        #[derive(RustcEncodable, RustcDecodable, PartialEq, Debug)]
-        struct Bar;
-
-        let v = Foo { a: None };
-        let mut d = Decoder::new(Table(map! {}));
-        assert_eq!(v, Decodable::decode(&mut d).unwrap());
-
-        let v = Foo { a: Some(vec![]) };
-        let mut d = Decoder::new(Table(map! {
-            a, Array(vec![])
-        }));
-        assert_eq!(v, Decodable::decode(&mut d).unwrap());
-    }
-
-    #[test]
-    fn round_trip() {
-        let toml = r#"
-              [test]
-              foo = "bar"
-
-              [[values]]
-              foo = "baz"
-
-              [[values]]
-              foo = "qux"
-        "#;
-
-        let value: Value = toml.parse().unwrap();
-        let val2 = ::encode_str(&value).parse().unwrap();
-        assert_eq!(value, val2);
-    }
-}
diff --git a/src/encoder/serde.rs b/src/encoder/serde.rs
deleted file mode 100644
index 997bc37..0000000
--- a/src/encoder/serde.rs
+++ /dev/null
@@ -1,339 +0,0 @@
-use std::mem;
-
-use serde::ser;
-use Value;
-use super::{Encoder, Error, EncoderState, State};
-
-impl Encoder {
-    fn table_begin(&mut self) -> Result<Self, Error> {
-        match self.state {
-            State::NextMapKey => Err(Error::InvalidMapKeyLocation),
-            _ => Ok(mem::replace(self, Encoder::new()))
-        }
-    }
-
-    fn table_end(&mut self, mut state: Self) -> Result<(), Error> {
-        match state.state {
-            State::NextKey(key) => {
-                mem::swap(&mut self.toml, &mut state.toml);
-                self.toml.insert(key, Value::Table(state.toml));
-            },
-            State::NextArray(mut arr) => {
-                mem::swap(&mut self.toml, &mut state.toml);
-                arr.push(Value::Table(state.toml));
-                self.state = State::NextArray(arr);
-            },
-            State::Start => {},
-            State::NextMapKey => unreachable!(),
-        }
-        Ok(())
-    }
-}
-
-impl ser::Serializer for Encoder {
-    type Error = Error;
-    type MapState = Self;
-    type StructState = Self;
-    type StructVariantState = Self;
-    type SeqState = EncoderState;
-    type TupleState = EncoderState;
-    type TupleStructState = EncoderState;
-    type TupleVariantState = EncoderState;
-
-    fn serialize_bool(&mut self, v: bool) -> Result<(), Error> {
-        self.emit_value(Value::Boolean(v))
-    }
-
-    fn serialize_i64(&mut self, v: i64) -> Result<(), Error> {
-        self.emit_value(Value::Integer(v))
-    }
-
-    // TODO: checked casts
-
-    fn serialize_u64(&mut self, v: u64) -> Result<(), Error> {
-        self.serialize_i64(v as i64)
-    }
-
-    fn serialize_isize(&mut self, v: isize) -> Result<(), Error> {
-        self.serialize_i64(v as i64)
-    }
-
-    fn serialize_usize(&mut self, v: usize) -> Result<(), Error> {
-        self.serialize_i64(v as i64)
-    }
-
-    fn serialize_i8(&mut self, v: i8) -> Result<(), Error> {
-        self.serialize_i64(v as i64)
-    }
-
-    fn serialize_u8(&mut self, v: u8) -> Result<(), Error> {
-        self.serialize_i64(v as i64)
-    }
-
-    fn serialize_i16(&mut self, v: i16) -> Result<(), Error> {
-        self.serialize_i64(v as i64)
-    }
-
-    fn serialize_u16(&mut self, v: u16) -> Result<(), Error> {
-        self.serialize_i64(v as i64)
-    }
-
-    fn serialize_i32(&mut self, v: i32) -> Result<(), Error> {
-        self.serialize_i64(v as i64)
-    }
-
-    fn serialize_u32(&mut self, v: u32) -> Result<(), Error> {
-        self.serialize_i64(v as i64)
-    }
-
-    fn serialize_f32(&mut self, v: f32) -> Result<(), Error> {
-        self.serialize_f64(v as f64)
-    }
-
-    fn serialize_f64(&mut self, v: f64) -> Result<(), Error> {
-        self.emit_value(Value::Float(v))
-    }
-
-    fn serialize_str(&mut self, value: &str) -> Result<(), Error> {
-        self.emit_value(Value::String(value.to_string()))
-    }
-
-    fn serialize_unit_struct(&mut self, _name: &'static str) -> Result<(), Error> {
-        Ok(())
-    }
-
-    fn serialize_unit(&mut self) -> Result<(), Error> {
-        Ok(())
-    }
-
-    fn serialize_none(&mut self) -> Result<(), Error> {
-        self.emit_none()
-    }
-
-    fn serialize_char(&mut self, c: char) -> Result<(), Error> {
-        self.serialize_str(&c.to_string())
-    }
-
-    fn serialize_some<V>(&mut self, value: V) -> Result<(), Error>
-        where V: ser::Serialize
-    {
-        value.serialize(self)
-    }
-
-    fn serialize_bytes(&mut self, v: &[u8]) -> Result<(), Error> {
-        let mut state = try!(self.serialize_seq(Some(v.len())));
-        for c in v {
-            try!(self.serialize_seq_elt(&mut state, c));
-        }
-        self.serialize_seq_end(state)
-    }
-
-    fn serialize_seq_fixed_size(&mut self, len: usize)
-                                -> Result<EncoderState, Error> {
-        self.serialize_seq(Some(len))
-    }
-
-    fn serialize_seq(&mut self, _len: Option<usize>)
-                     -> Result<EncoderState, Error> {
-        self.seq_begin().map(|s| EncoderState { inner: s })
-    }
-
-    fn serialize_seq_elt<T>(&mut self,
-                            _state: &mut EncoderState,
-                            value: T) -> Result<(), Error>
-        where T: ser::Serialize
-    {
-        value.serialize(self)
-    }
-
-    fn serialize_seq_end(&mut self, state: EncoderState) -> Result<(), Error> {
-        self.seq_end(state.inner)
-    }
-
-    fn serialize_tuple(&mut self, len: usize)
-                       -> Result<EncoderState, Error> {
-        self.serialize_seq(Some(len))
-    }
-
-    fn serialize_tuple_elt<T>(&mut self,
-                              state: &mut EncoderState,
-                              value: T) -> Result<(), Error>
-        where T: ser::Serialize
-    {
-        self.serialize_seq_elt(state, value)
-    }
-
-    fn serialize_tuple_end(&mut self, state: EncoderState) -> Result<(), Error> {
-        self.serialize_seq_end(state)
-    }
-
-    fn serialize_tuple_struct(&mut self,
-                              _name: &'static str,
-                              len: usize) -> Result<EncoderState, Error> {
-        self.serialize_seq(Some(len))
-    }
-
-    fn serialize_tuple_struct_elt<T>(&mut self,
-                                     state: &mut EncoderState,
-                                     value: T) -> Result<(), Error>
-        where T: ser::Serialize
-    {
-        self.serialize_seq_elt(state, value)
-    }
-
-    fn serialize_tuple_struct_end(&mut self, state: EncoderState)
-                                  -> Result<(), Error> {
-        self.serialize_seq_end(state)
-    }
-
-    fn serialize_tuple_variant(&mut self,
-                               _name: &'static str,
-                               _id: usize,
-                               _variant: &'static str,
-                               len: usize) -> Result<EncoderState, Error> {
-        self.serialize_seq(Some(len))
-    }
-
-    fn serialize_tuple_variant_elt<T>(&mut self,
-                                      state: &mut EncoderState,
-                                      value: T) -> Result<(), Error>
-        where T: ser::Serialize
-    {
-        self.serialize_seq_elt(state, value)
-    }
-
-    fn serialize_tuple_variant_end(&mut self, state: EncoderState)
-                                   -> Result<(), Error> {
-        self.serialize_seq_end(state)
-    }
-
-    fn serialize_map(&mut self, _len: Option<usize>) -> Result<Self, Error> {
-        self.table_begin()
-    }
-
-    fn serialize_map_key<K>(&mut self,
-                            _state: &mut Encoder,
-                            key: K) -> Result<(), Error>
-        where K: ser::Serialize
-    {
-        self.table_key(|me| key.serialize(me))
-    }
-
-    fn serialize_map_value<V>(&mut self,
-                              _state: &mut Encoder,
-                              value: V) -> Result<(), Error>
-        where V: ser::Serialize
-    {
-        value.serialize(self)
-    }
-
-    fn serialize_map_end(&mut self, state: Self) -> Result<(), Error> {
-        self.table_end(state)
-    }
-
-    fn serialize_struct(&mut self,
-                        _name: &'static str,
-                        len: usize) -> Result<Self, Error> {
-        self.serialize_map(Some(len))
-    }
-
-    fn serialize_struct_elt<V>(&mut self,
-                               state: &mut Encoder,
-                               key: &'static str,
-                               value: V) -> Result<(), Error>
-        where V: ser::Serialize
-    {
-        try!(self.serialize_map_key(state, key));
-        self.serialize_map_value(state, value)
-    }
-
-    fn serialize_struct_end(&mut self, state: Self) -> Result<(), Error> {
-        self.serialize_map_end(state)
-    }
-
-    fn serialize_struct_variant(&mut self,
-                                _name: &'static str,
-                                _id: usize,
-                                _variant: &'static str,
-                                len: usize) -> Result<Self, Error> {
-        self.serialize_map(Some(len))
-    }
-
-    fn serialize_struct_variant_elt<V>(&mut self,
-                                       state: &mut Encoder,
-                                       key: &'static str,
-                                       value: V) -> Result<(), Error>
-        where V: ser::Serialize
-    {
-        try!(self.serialize_map_key(state, key));
-        self.serialize_map_value(state, value)
-    }
-
-    fn serialize_struct_variant_end(&mut self, state: Self) -> Result<(), Error> {
-        self.serialize_map_end(state)
-    }
-
-    fn serialize_newtype_struct<T>(&mut self,
-                                   _name: &'static str,
-                                   value: T) -> Result<(), Self::Error>
-        where T: ser::Serialize,
-    {
-        // Don't serialize the newtype struct in a tuple.
-        value.serialize(self)
-    }
-
-    fn serialize_newtype_variant<T>(&mut self,
-                                    _name: &'static str,
-                                    _variant_index: usize,
-                                    _variant: &'static str,
-                                    value: T) -> Result<(), Self::Error>
-        where T: ser::Serialize,
-    {
-        // Don't serialize the newtype struct variant in a tuple.
-        value.serialize(self)
-    }
-
-    fn serialize_unit_variant(&mut self,
-                               _name: &'static str,
-                               _variant_index: usize,
-                               _variant: &'static str,
-                               ) -> Result<(), Self::Error>
-    {
-        Ok(())
-    }
-}
-
-impl ser::Serialize for Value {
-    fn serialize<E>(&self, e: &mut E) -> Result<(), E::Error>
-        where E: ser::Serializer
-    {
-        match *self {
-            Value::String(ref s) => e.serialize_str(s),
-            Value::Integer(i) => e.serialize_i64(i),
-            Value::Float(f) => e.serialize_f64(f),
-            Value::Boolean(b) => e.serialize_bool(b),
-            Value::Datetime(ref s) => e.serialize_str(s),
-            Value::Array(ref a) => {
-                let mut state = try!(e.serialize_seq(Some(a.len())));
-                for el in a.iter() {
-                    try!(e.serialize_seq_elt(&mut state, el));
-                }
-                e.serialize_seq_end(state)
-            }
-            Value::Table(ref t) => {
-                let mut state = try!(e.serialize_map(Some(t.len())));
-                for (k, v) in t.iter() {
-                    try!(e.serialize_map_key(&mut state, k));
-                    try!(e.serialize_map_value(&mut state, v));
-                }
-                e.serialize_map_end(state)
-            }
-        }
-    }
-}
-
-impl ser::Error for Error {
-    fn custom<T: Into<String>>(msg: T) -> Error {
-        Error::Custom(msg.into())
-    }
-}