904 lines
23 KiB
Rust
904 lines
23 KiB
Rust
extern crate collections;
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use std::hash::Hash;
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use std::num;
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use std::result;
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use collections::HashMap;
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#[deriving(Clone, Eq)]
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pub enum Token {
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Null,
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Bool(bool),
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Int(int),
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I8(i8),
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I16(i16),
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I32(i32),
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I64(i64),
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Uint(uint),
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U8(u8),
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U16(u16),
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U32(u32),
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U64(u64),
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F32(f32),
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F64(f64),
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Char(char),
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Str(&'static str),
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StrBuf(StrBuf),
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Option(bool),
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TupleStart(uint),
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StructStart(&'static str),
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StructField(&'static str),
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EnumStart(&'static str),
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EnumVariant(&'static str),
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SeqStart(uint),
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MapStart(uint),
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Sep,
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End,
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}
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macro_rules! expect_token {
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() => {
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match self.next() {
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Some(token) => token,
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None => { return Err(self.end_of_stream_error()); }
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}
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}
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}
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macro_rules! match_token {
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($( $variant:pat => $expr:expr ),+) => {
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match expect_token!() {
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$( Ok($variant) => $expr ),+,
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Ok(_) => { return Err(self.syntax_error()); }
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Err(err) => { return Err(err); }
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}
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}
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}
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macro_rules! to_result {
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($expr:expr, $err:expr) => {
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match $expr {
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Some(value) => Ok(value),
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None => Err($err),
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}
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}
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}
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pub trait Deserializer<E>: Iterator<Result<Token, E>> {
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fn end_of_stream_error(&self) -> E;
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fn syntax_error(&self) -> E;
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#[inline]
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fn expect_null(&mut self) -> Result<(), E> {
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match_token! {
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Null => Ok(()),
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TupleStart(_) => {
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match_token! {
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End => Ok(())
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}
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}
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}
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}
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#[inline]
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fn expect_bool(&mut self) -> Result<bool, E> {
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match_token! {
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Bool(value) => Ok(value)
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}
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}
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#[inline]
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fn expect_num<T: NumCast>(&mut self) -> Result<T, E> {
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match_token! {
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Int(x) => to_result!(num::cast(x), self.syntax_error()),
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I8(x) => to_result!(num::cast(x), self.syntax_error()),
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I16(x) => to_result!(num::cast(x), self.syntax_error()),
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I32(x) => to_result!(num::cast(x), self.syntax_error()),
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I64(x) => to_result!(num::cast(x), self.syntax_error()),
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Uint(x) => to_result!(num::cast(x), self.syntax_error()),
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U8(x) => to_result!(num::cast(x), self.syntax_error()),
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U16(x) => to_result!(num::cast(x), self.syntax_error()),
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U32(x) => to_result!(num::cast(x), self.syntax_error()),
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U64(x) => to_result!(num::cast(x), self.syntax_error()),
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F32(x) => to_result!(num::cast(x), self.syntax_error()),
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F64(x) => to_result!(num::cast(x), self.syntax_error())
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}
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}
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#[inline]
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fn expect_char(&mut self) -> Result<char, E> {
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match_token! {
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Char(value) => Ok(value)
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}
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}
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#[inline]
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fn expect_str(&mut self) -> Result<&'static str, E> {
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match_token! {
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Str(value) => Ok(value)
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}
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}
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#[inline]
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fn expect_strbuf(&mut self) -> Result<StrBuf, E> {
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match_token! {
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Str(value) => Ok(value.to_strbuf()),
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StrBuf(value) => Ok(value)
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}
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}
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#[inline]
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fn expect_option<
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T: Deserializable<E, Self>
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>(&mut self) -> Result<Option<T>, E> {
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match_token! {
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Option(false) => Ok(None),
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Option(true) => {
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let value: T = try!(Deserializable::deserialize(self));
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Ok(Some(value))
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}
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}
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}
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#[inline]
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fn expect_tuple_start(&mut self, len: uint) -> Result<(), E> {
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match_token! {
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TupleStart(l) => {
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if len == l {
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Ok(())
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} else {
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Err(self.syntax_error())
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}
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}
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}
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}
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#[inline]
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fn expect_tuple_elt<T: Deserializable<E, Self>>(&mut self) -> Result<T, E> {
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match_token! {
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Sep => Deserializable::deserialize(self)
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}
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}
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#[inline]
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fn expect_struct_start(&mut self, name: &str) -> Result<(), E> {
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match_token! {
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StructStart(n) => {
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if name == n {
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Ok(())
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} else {
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Err(self.syntax_error())
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}
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}
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}
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}
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#[inline]
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fn expect_struct_field<
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T: Deserializable<E, Self>
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>(&mut self, name: &str) -> Result<T, E> {
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match_token! {
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StructField(n) => {
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if name == n {
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Deserializable::deserialize(self)
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} else {
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Err(self.syntax_error())
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}
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}
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}
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}
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#[inline]
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fn expect_enum_start<'a>(&mut self, name: &str, variants: &[&str]) -> Result<uint, E> {
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match_token! {
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EnumStart(n) => {
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if name == n {
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match_token! {
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EnumVariant(n) => {
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match variants.iter().position(|variant| *variant == n) {
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Some(position) => Ok(position),
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None => Err(self.syntax_error()),
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}
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}
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}
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} else {
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Err(self.syntax_error())
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}
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}
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}
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}
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#[inline]
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fn expect_collection<
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T: Deserializable<E, Self>,
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C: FromIterator<T>
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>(&mut self) -> Result<C, E> {
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// By default we don't care what our source input was. We can take
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// anything that's a Collection<T>. We'll error out later if the types
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// are wrong.
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let len = match_token! {
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TupleStart(len) => len,
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SeqStart(len) => len,
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MapStart(len) => len
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};
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expect_rest_of_collection(self, len)
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}
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#[inline]
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fn expect_seq<
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T: Deserializable<E, Self>,
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C: FromIterator<T>
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>(&mut self) -> Result<C, E> {
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let len = match_token! {
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SeqStart(len) => len
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};
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expect_rest_of_collection(self, len)
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}
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#[inline]
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fn expect_map<
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K: Deserializable<E, Self>,
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V: Deserializable<E, Self>,
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C: FromIterator<(K, V)>
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>(&mut self) -> Result<C, E> {
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let len = match_token! {
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MapStart(len) => len
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};
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expect_rest_of_collection(self, len)
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}
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#[inline]
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fn expect_end(&mut self) -> Result<(), E> {
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match_token! {
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End => Ok(())
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}
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}
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}
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//////////////////////////////////////////////////////////////////////////////
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fn expect_rest_of_collection<
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E,
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D: Deserializer<E>,
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T: Deserializable<E, D>,
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C: FromIterator<T>
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>(d: &mut D, len: uint) -> Result<C, E> {
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let iter = d.by_ref().batch(|d| {
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let d = d.iter();
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let token = match d.next() {
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Some(token) => token,
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None => { return None; }
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};
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match token {
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Ok(Sep) => {
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let value: Result<T, E> = Deserializable::deserialize(d);
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Some(value)
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}
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Ok(End) => None,
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Ok(_) => Some(Err(d.syntax_error())),
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Err(e) => Some(Err(e)),
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}
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});
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result::collect_with_capacity(iter, len)
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}
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//////////////////////////////////////////////////////////////////////////////
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pub trait Deserializable<E, D: Deserializer<E>> {
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fn deserialize(d: &mut D) -> Result<Self, E>;
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}
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//////////////////////////////////////////////////////////////////////////////
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macro_rules! impl_deserializable {
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($ty:ty, $method:ident) => {
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impl<
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E,
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D: Deserializer<E>
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> Deserializable<E, D> for $ty {
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#[inline]
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fn deserialize(d: &mut D) -> Result<$ty, E> {
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d.$method()
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}
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}
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}
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}
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impl_deserializable!(bool, expect_bool)
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impl_deserializable!(int, expect_num)
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impl_deserializable!(i8, expect_num)
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impl_deserializable!(i16, expect_num)
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impl_deserializable!(i32, expect_num)
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impl_deserializable!(i64, expect_num)
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impl_deserializable!(uint, expect_num)
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impl_deserializable!(u8, expect_num)
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impl_deserializable!(u16, expect_num)
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impl_deserializable!(u32, expect_num)
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impl_deserializable!(u64, expect_num)
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impl_deserializable!(f32, expect_num)
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impl_deserializable!(f64, expect_num)
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impl_deserializable!(char, expect_char)
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impl_deserializable!(&'static str, expect_str)
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impl_deserializable!(StrBuf, expect_strbuf)
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//////////////////////////////////////////////////////////////////////////////
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impl<
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E,
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D: Deserializer<E>,
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T: Deserializable<E, D>
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> Deserializable<E, D> for Option<T> {
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#[inline]
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fn deserialize(d: &mut D) -> Result<Option<T>, E> {
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d.expect_option()
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}
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}
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//////////////////////////////////////////////////////////////////////////////
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impl<
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E,
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D: Deserializer<E>,
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T: Deserializable<E, D>
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> Deserializable<E, D> for Vec<T> {
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#[inline]
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fn deserialize(d: &mut D) -> Result<Vec<T>, E> {
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d.expect_seq()
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}
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}
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impl<
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E,
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D: Deserializer<E>,
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K: Deserializable<E, D> + TotalEq + Hash,
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V: Deserializable<E, D>
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> Deserializable<E, D> for HashMap<K, V> {
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#[inline]
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fn deserialize(d: &mut D) -> Result<HashMap<K, V>, E> {
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d.expect_map()
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}
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}
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//////////////////////////////////////////////////////////////////////////////
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impl<
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E,
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D: Deserializer<E>
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> Deserializable<E, D> for () {
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#[inline]
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fn deserialize(d: &mut D) -> Result<(), E> {
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d.expect_null()
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}
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}
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//////////////////////////////////////////////////////////////////////////////
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macro_rules! peel(($name:ident, $($other:ident,)*) => (deserialize_tuple!($($other,)*)))
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macro_rules! deserialize_tuple (
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() => ();
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( $($name:ident,)+ ) => (
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impl<
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E,
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D: Deserializer<E>,
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$($name:Deserializable<E, D>),*
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> Deserializable<E, D> for ($($name,)*) {
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#[inline]
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#[allow(uppercase_variables)]
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fn deserialize(d: &mut D) -> Result<($($name,)*), E> {
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// FIXME: how can we count macro args?
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let mut len = 0;
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$({ let $name = 1; len += $name; })*;
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try!(d.expect_tuple_start(len));
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let result = ($({
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let $name = try!(d.expect_tuple_elt());
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$name
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},)*);
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try!(d.expect_end());
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Ok(result)
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}
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}
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peel!($($name,)*)
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)
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)
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deserialize_tuple! { T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, }
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//////////////////////////////////////////////////////////////////////////////
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#[cfg(test)]
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mod tests {
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use collections::HashMap;
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use test::Bencher;
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use serialize::Decoder;
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use super::{Token, Null, Int, Uint, Str, StrBuf, Char, Option};
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use super::{TupleStart, StructStart, StructField, EnumStart, EnumVariant};
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use super::{SeqStart, MapStart, Sep, End};
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use super::{Deserializer, Deserializable};
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//////////////////////////////////////////////////////////////////////////////
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#[deriving(Clone, Eq, Show, Decodable)]
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struct Inner {
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a: (),
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b: uint,
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c: HashMap<StrBuf, Option<char>>,
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}
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impl<E, D: Deserializer<E>> Deserializable<E, D> for Inner {
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#[inline]
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fn deserialize(d: &mut D) -> Result<Inner, E> {
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try!(d.expect_struct_start("Inner"));
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let a = try!(d.expect_struct_field("a"));
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let b = try!(d.expect_struct_field("b"));
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let c = try!(d.expect_struct_field("c"));
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try!(d.expect_end());
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Ok(Inner { a: a, b: b, c: c })
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}
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}
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//////////////////////////////////////////////////////////////////////////////
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#[deriving(Clone, Eq, Show, Decodable)]
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struct Outer {
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inner: Vec<Inner>,
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}
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impl<E, D: Deserializer<E>> Deserializable<E, D> for Outer {
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#[inline]
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fn deserialize(d: &mut D) -> Result<Outer, E> {
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try!(d.expect_struct_start("Outer"));
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let inner = try!(d.expect_struct_field("inner"));
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try!(d.expect_end());
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Ok(Outer { inner: inner })
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}
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}
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//////////////////////////////////////////////////////////////////////////////
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#[deriving(Clone, Eq, Show, Decodable)]
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enum Animal {
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Dog,
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Frog(StrBuf, int)
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}
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impl<E, D: Deserializer<E>> Deserializable<E, D> for Animal {
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#[inline]
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fn deserialize(d: &mut D) -> Result<Animal, E> {
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match try!(d.expect_enum_start("Animal", ["Dog", "Frog"])) {
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0 => {
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try!(d.expect_end());
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Ok(Dog)
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}
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1 => {
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let x0 = try!(Deserializable::deserialize(d));
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let x1 = try!(Deserializable::deserialize(d));
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try!(d.expect_end());
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Ok(Frog(x0, x1))
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}
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_ => unreachable!(),
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}
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}
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}
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|
|
//////////////////////////////////////////////////////////////////////////////
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#[deriving(Show)]
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enum Error {
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EndOfStream,
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SyntaxError,
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}
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//////////////////////////////////////////////////////////////////////////////
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|
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struct TokenDeserializer {
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tokens: Vec<Token>,
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}
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impl TokenDeserializer {
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#[inline]
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fn new(tokens: Vec<Token>) -> TokenDeserializer {
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TokenDeserializer {
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tokens: tokens,
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}
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}
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}
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impl Iterator<Result<Token, Error>> for TokenDeserializer {
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#[inline]
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fn next(&mut self) -> Option<Result<Token, Error>> {
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match self.tokens.shift() {
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None => None,
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Some(token) => Some(Ok(token)),
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}
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}
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}
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impl Deserializer<Error> for TokenDeserializer {
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#[inline]
|
|
fn end_of_stream_error(&self) -> Error {
|
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EndOfStream
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}
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#[inline]
|
|
fn syntax_error(&self) -> Error {
|
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SyntaxError
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}
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}
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|
|
|
//////////////////////////////////////////////////////////////////////////////
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|
#[test]
|
|
fn test_tokens_int() {
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let tokens = vec!(
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Int(5),
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);
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|
let mut deserializer = TokenDeserializer::new(tokens);
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let value: int = Deserializable::deserialize(&mut deserializer).unwrap();
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assert_eq!(value, 5);
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}
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|
|
#[test]
|
|
fn test_tokens_str() {
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|
let tokens = vec!(
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Str("a"),
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);
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|
|
let mut deserializer = TokenDeserializer::new(tokens);
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let value: &'static str = Deserializable::deserialize(&mut deserializer).unwrap();
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assert_eq!(value, "a");
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}
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|
|
#[test]
|
|
fn test_tokens_strbuf() {
|
|
let tokens = vec!(
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StrBuf("a".to_strbuf()),
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);
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|
|
let mut deserializer = TokenDeserializer::new(tokens);
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|
let value: StrBuf = Deserializable::deserialize(&mut deserializer).unwrap();
|
|
|
|
assert_eq!(value, "a".to_strbuf());
|
|
}
|
|
|
|
#[test]
|
|
fn test_tokens_null() {
|
|
let tokens = vec!(
|
|
Null,
|
|
);
|
|
|
|
let mut deserializer = TokenDeserializer::new(tokens);
|
|
let value: () = Deserializable::deserialize(&mut deserializer).unwrap();
|
|
|
|
assert_eq!(value, ());
|
|
}
|
|
|
|
#[test]
|
|
fn test_tokens_tuple_empty() {
|
|
let tokens = vec!(
|
|
TupleStart(0),
|
|
End,
|
|
);
|
|
|
|
let mut deserializer = TokenDeserializer::new(tokens);
|
|
let value: () = Deserializable::deserialize(&mut deserializer).unwrap();
|
|
|
|
assert_eq!(value, ());
|
|
}
|
|
|
|
#[test]
|
|
fn test_tokens_option_none() {
|
|
let tokens = vec!(
|
|
Option(false),
|
|
);
|
|
|
|
let mut deserializer = TokenDeserializer::new(tokens);
|
|
let value: Option<int> = Deserializable::deserialize(&mut deserializer).unwrap();
|
|
|
|
assert_eq!(value, None);
|
|
}
|
|
|
|
#[test]
|
|
fn test_tokens_option_some() {
|
|
let tokens = vec!(
|
|
Option(true),
|
|
Int(5),
|
|
);
|
|
|
|
let mut deserializer = TokenDeserializer::new(tokens);
|
|
let value: Option<int> = Deserializable::deserialize(&mut deserializer).unwrap();
|
|
|
|
assert_eq!(value, Some(5));
|
|
}
|
|
|
|
#[test]
|
|
fn test_tokens_tuple() {
|
|
let tokens = vec!(
|
|
TupleStart(2),
|
|
Sep,
|
|
Int(5),
|
|
|
|
Sep,
|
|
StrBuf("a".to_strbuf()),
|
|
End,
|
|
);
|
|
|
|
let mut deserializer = TokenDeserializer::new(tokens);
|
|
let value: (int, StrBuf) = Deserializable::deserialize(&mut deserializer).unwrap();
|
|
|
|
assert_eq!(value, (5, "a".to_strbuf()));
|
|
}
|
|
|
|
#[test]
|
|
fn test_tokens_tuple_compound() {
|
|
let tokens = vec!(
|
|
TupleStart(3),
|
|
Sep,
|
|
Null,
|
|
|
|
Sep,
|
|
TupleStart(0),
|
|
End,
|
|
|
|
Sep,
|
|
TupleStart(2),
|
|
Sep,
|
|
Int(5),
|
|
|
|
Sep,
|
|
StrBuf("a".to_strbuf()),
|
|
End,
|
|
End,
|
|
);
|
|
|
|
let mut deserializer = TokenDeserializer::new(tokens);
|
|
let value: ((), (), (int, StrBuf)) = Deserializable::deserialize(&mut deserializer).unwrap();
|
|
|
|
assert_eq!(value, ((), (), (5, "a".to_strbuf())));
|
|
}
|
|
|
|
#[test]
|
|
fn test_tokens_struct_empty() {
|
|
let tokens = vec!(
|
|
StructStart("Outer"),
|
|
StructField("inner"),
|
|
SeqStart(0),
|
|
End,
|
|
End,
|
|
);
|
|
|
|
let mut deserializer = TokenDeserializer::new(tokens);
|
|
let value: Outer = Deserializable::deserialize(&mut deserializer).unwrap();
|
|
|
|
assert_eq!(value, Outer { inner: vec!() });
|
|
}
|
|
|
|
#[test]
|
|
fn test_tokens_struct() {
|
|
let tokens = vec!(
|
|
StructStart("Outer"),
|
|
StructField("inner"),
|
|
SeqStart(1),
|
|
Sep,
|
|
StructStart("Inner"),
|
|
StructField("a"),
|
|
Null,
|
|
|
|
StructField("b"),
|
|
Uint(5),
|
|
|
|
StructField("c"),
|
|
MapStart(1),
|
|
Sep,
|
|
TupleStart(2),
|
|
Sep,
|
|
StrBuf("abc".to_strbuf()),
|
|
|
|
Sep,
|
|
Option(true),
|
|
Char('c'),
|
|
End,
|
|
End,
|
|
End,
|
|
End,
|
|
End,
|
|
);
|
|
|
|
let mut deserializer = TokenDeserializer::new(tokens);
|
|
let value: Outer = Deserializable::deserialize(&mut deserializer).unwrap();
|
|
|
|
let mut map = HashMap::new();
|
|
map.insert("abc".to_strbuf(), Some('c'));
|
|
|
|
assert_eq!(
|
|
value,
|
|
Outer {
|
|
inner: vec!(
|
|
Inner {
|
|
a: (),
|
|
b: 5,
|
|
c: map,
|
|
},
|
|
)
|
|
});
|
|
}
|
|
|
|
#[test]
|
|
fn test_tokens_enum() {
|
|
let tokens = vec!(
|
|
EnumStart("Animal"),
|
|
EnumVariant("Dog"),
|
|
End,
|
|
);
|
|
|
|
let mut deserializer = TokenDeserializer::new(tokens);
|
|
let value: Animal = Deserializable::deserialize(&mut deserializer).unwrap();
|
|
|
|
assert_eq!(value, Dog);
|
|
|
|
let tokens = vec!(
|
|
EnumStart("Animal"),
|
|
EnumVariant("Frog"),
|
|
StrBuf("Henry".to_strbuf()),
|
|
Int(349),
|
|
End,
|
|
);
|
|
|
|
let mut deserializer = TokenDeserializer::new(tokens);
|
|
let value: Animal = Deserializable::deserialize(&mut deserializer).unwrap();
|
|
|
|
assert_eq!(value, Frog("Henry".to_strbuf(), 349));
|
|
}
|
|
|
|
#[test]
|
|
fn test_tokens_vec_empty() {
|
|
let tokens = vec!(
|
|
SeqStart(0),
|
|
End,
|
|
);
|
|
|
|
let mut deserializer = TokenDeserializer::new(tokens);
|
|
let value: Vec<int> = Deserializable::deserialize(&mut deserializer).unwrap();
|
|
|
|
assert_eq!(value, vec!());
|
|
}
|
|
|
|
#[test]
|
|
fn test_tokens_vec() {
|
|
let tokens = vec!(
|
|
SeqStart(3),
|
|
Sep,
|
|
Int(5),
|
|
|
|
Sep,
|
|
Int(6),
|
|
|
|
Sep,
|
|
Int(7),
|
|
End,
|
|
);
|
|
|
|
let mut deserializer = TokenDeserializer::new(tokens);
|
|
let value: Vec<int> = Deserializable::deserialize(&mut deserializer).unwrap();
|
|
|
|
assert_eq!(value, vec!(5, 6, 7));
|
|
}
|
|
|
|
#[test]
|
|
fn test_tokens_vec_compound() {
|
|
let tokens = vec!(
|
|
SeqStart(0),
|
|
Sep,
|
|
SeqStart(1),
|
|
Sep,
|
|
Int(1),
|
|
End,
|
|
|
|
Sep,
|
|
SeqStart(2),
|
|
Sep,
|
|
Int(2),
|
|
|
|
Sep,
|
|
Int(3),
|
|
End,
|
|
|
|
Sep,
|
|
SeqStart(3),
|
|
Sep,
|
|
Int(4),
|
|
|
|
Sep,
|
|
Int(5),
|
|
|
|
Sep,
|
|
Int(6),
|
|
End,
|
|
End,
|
|
);
|
|
|
|
let mut deserializer = TokenDeserializer::new(tokens);
|
|
let value: Vec<Vec<int>> = Deserializable::deserialize(&mut deserializer).unwrap();
|
|
|
|
assert_eq!(value, vec!(vec!(1), vec!(2, 3), vec!(4, 5, 6)));
|
|
}
|
|
|
|
#[test]
|
|
fn test_tokens_hashmap() {
|
|
let tokens = vec!(
|
|
MapStart(2),
|
|
Sep,
|
|
TupleStart(2),
|
|
Sep,
|
|
Int(5),
|
|
|
|
Sep,
|
|
StrBuf("a".to_strbuf()),
|
|
End,
|
|
|
|
Sep,
|
|
TupleStart(2),
|
|
Sep,
|
|
Int(6),
|
|
|
|
Sep,
|
|
StrBuf("b".to_strbuf()),
|
|
End,
|
|
End,
|
|
);
|
|
|
|
let mut deserializer = TokenDeserializer::new(tokens);
|
|
let value: HashMap<int, StrBuf> = Deserializable::deserialize(&mut deserializer).unwrap();
|
|
|
|
let mut map = HashMap::new();
|
|
map.insert(5, "a".to_strbuf());
|
|
map.insert(6, "b".to_strbuf());
|
|
|
|
assert_eq!(value, map);
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_token_deserializer(b: &mut Bencher) {
|
|
b.iter(|| {
|
|
let tokens = vec!(
|
|
SeqStart(3),
|
|
Sep,
|
|
Int(5),
|
|
|
|
Sep,
|
|
Int(6),
|
|
|
|
Sep,
|
|
Int(7),
|
|
End,
|
|
);
|
|
|
|
let mut d = TokenDeserializer::new(tokens);
|
|
let value: Vec<int> = Deserializable::deserialize(&mut d).unwrap();
|
|
|
|
assert_eq!(value, vec!(5, 6, 7));
|
|
})
|
|
}
|
|
}
|