759 lines
22 KiB
Rust
759 lines
22 KiB
Rust
extern crate collections;
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use std::hash::Hash;
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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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Int(int),
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StrBuf(StrBuf),
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CollectionStart,
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CollectionSep,
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CollectionEnd,
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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_int(&mut self) -> Result<int, E> {
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match self.next() {
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Some(Ok(Int(value))) => Ok(value),
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Some(Ok(_)) => Err(self.syntax_error()),
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Some(Err(err)) => Err(err),
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None => Err(self.end_of_stream_error()),
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}
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}
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#[inline]
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fn expect_str(&mut self) -> Result<StrBuf, E> {
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match self.next() {
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Some(Ok(StrBuf(value))) => Ok(value),
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Some(Ok(_)) => Err(self.syntax_error()),
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Some(Err(err)) => Err(err),
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None => Err(self.end_of_stream_error()),
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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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try!(self.expect_collection_start());
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let mut err = None;
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let values: C = FromIterator::from_iter(
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Batch::new(self, |d| {
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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(CollectionSep) => {
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let value: Result<T, E> = Deserializable::deserialize(d);
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match value {
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Ok(value) => Some(value),
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Err(e) => {
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err = Some(e);
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None
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}
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}
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}
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Ok(CollectionEnd) => {
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None
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}
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Ok(_) => {
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err = Some(d.syntax_error());
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None
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}
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Err(e) => {
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err = Some(e);
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None
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}
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}
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})
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);
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match err {
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None => Ok(values),
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Some(err) => Err(err),
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}
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}
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#[inline]
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fn expect_collection_start(&mut self) -> Result<(), E> {
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match self.next() {
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Some(Ok(CollectionStart)) => Ok(()),
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Some(Ok(_)) => Err(self.syntax_error()),
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Some(Err(err)) => Err(err),
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None => Err(self.end_of_stream_error()),
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}
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}
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#[inline]
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fn expect_collection_sep(&mut self) -> Result<(), E> {
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match self.next() {
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Some(Ok(CollectionSep)) => Ok(()),
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Some(Ok(_)) => Err(self.syntax_error()),
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Some(Err(err)) => Err(err),
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None => Err(self.end_of_stream_error()),
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}
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}
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#[inline]
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fn expect_collection_end(&mut self) -> Result<(), E> {
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match self.next() {
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Some(Ok(CollectionEnd)) => Ok(()),
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Some(Ok(_)) => Err(self.syntax_error()),
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Some(Err(err)) => Err(err),
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None => Err(self.end_of_stream_error()),
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}
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}
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#[inline]
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fn expect_collection_sep_or_end(&mut self) -> Result<bool, E> {
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match self.next() {
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Some(Ok(CollectionSep)) => Ok(false),
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Some(Ok(CollectionEnd)) => Ok(true),
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Some(Ok(_)) => Err(self.syntax_error()),
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Some(Err(err)) => Err(err),
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None => Err(self.end_of_stream_error()),
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}
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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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impl<
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E,
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D: Deserializer<E>
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> Deserializable<E, D> for int {
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#[inline]
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fn deserialize(d: &mut D) -> Result<int, E> {
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d.expect_int()
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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 StrBuf {
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#[inline]
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fn deserialize(d: &mut D) -> Result<StrBuf, E> {
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d.expect_str()
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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 Option<T> {
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#[inline]
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fn deserialize(_d: &mut D) -> Result<Option<T>, E> {
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fail!()
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//d.expect_collection()
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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_collection()
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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_collection()
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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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try!(d.expect_collection_start());
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try!(d.expect_collection_end());
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Ok(())
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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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T0: Deserializable<E, D>
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> Deserializable<E, D> for (T0,) {
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#[inline]
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fn deserialize(d: &mut D) -> Result<(T0,), E> {
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try!(d.expect_collection_start());
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try!(d.expect_collection_sep());
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let x0 = try!(Deserializable::deserialize(d));
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try!(d.expect_collection_end());
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Ok((x0,))
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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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T0: Deserializable<E, D>,
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T1: Deserializable<E, D>
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> Deserializable<E, D> for (T0, T1) {
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#[inline]
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fn deserialize(d: &mut D) -> Result<(T0, T1), E> {
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try!(d.expect_collection_start());
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try!(d.expect_collection_sep());
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let x0 = try!(Deserializable::deserialize(d));
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try!(d.expect_collection_sep());
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let x1 = try!(Deserializable::deserialize(d));
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try!(d.expect_collection_end());
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Ok((x0, x1))
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}
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}
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//////////////////////////////////////////////////////////////////////////////
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struct Batch<'a, A, B, T> {
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iter: &'a mut T,
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f: |&mut T|: 'a -> Option<B>,
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}
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impl<'a, A, B, T: Iterator<A>> Batch<'a, A, B, T> {
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#[inline]
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fn new(iter: &'a mut T, f: |&mut T|: 'a -> Option<B>) -> Batch<'a, A, B, T> {
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Batch {
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iter: iter,
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f: f,
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}
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}
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}
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impl<'a, A, B, T: Iterator<A>> Iterator<B> for Batch<'a, A, B, T> {
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#[inline]
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fn next(&mut self) -> Option<B> {
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(self.f)(self.iter)
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}
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}
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//////////////////////////////////////////////////////////////////////////////
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#[cfg(test)]
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mod tests {
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extern crate collections;
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extern crate serialize;
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extern crate test;
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use std::vec;
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use self::collections::HashMap;
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use self::test::Bencher;
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use self::serialize::{Decoder, Decodable};
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use super::{Token, Int, StrBuf, CollectionStart, CollectionSep, CollectionEnd};
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use super::{Deserializer, Deserializable};
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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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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]
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fn end_of_stream_error(&self) -> Error {
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EndOfStream
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}
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#[inline]
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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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#[deriving(Eq, Show)]
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enum IntsDeserializerState {
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Start,
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Sep,
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Value,
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End,
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}
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struct IntsDeserializer {
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state: IntsDeserializerState,
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iter: vec::MoveItems<int>,
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value: Option<int>
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}
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impl IntsDeserializer {
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#[inline]
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fn new(values: Vec<int>) -> IntsDeserializer {
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IntsDeserializer {
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state: Start,
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iter: values.move_iter(),
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value: None,
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}
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}
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}
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impl Iterator<Result<Token, Error>> for IntsDeserializer {
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#[inline]
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fn next(&mut self) -> Option<Result<Token, Error>> {
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match self.state {
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Start => {
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self.state = Sep;
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Some(Ok(CollectionStart))
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}
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Sep => {
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match self.iter.next() {
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Some(value) => {
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self.state = Value;
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self.value = Some(value);
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Some(Ok(CollectionSep))
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}
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None => {
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self.state = End;
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Some(Ok(CollectionEnd))
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}
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}
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}
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Value => {
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self.state = Sep;
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match self.value.take() {
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Some(value) => Some(Ok(Int(value))),
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None => Some(Err(self.end_of_stream_error())),
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}
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}
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End => {
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None
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}
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}
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}
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}
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impl Deserializer<Error> for IntsDeserializer {
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#[inline]
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fn end_of_stream_error(&self) -> Error {
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EndOfStream
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}
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#[inline]
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fn syntax_error(&self) -> Error {
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SyntaxError
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}
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#[inline]
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fn expect_int(&mut self) -> Result<int, Error> {
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assert_eq!(self.state, Value);
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self.state = Sep;
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match self.value.take() {
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Some(value) => Ok(value),
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None => Err(self.end_of_stream_error()),
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}
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}
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}
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struct IntsDecoder {
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iter: vec::MoveItems<int>,
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}
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impl IntsDecoder {
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#[inline]
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fn new(values: Vec<int>) -> IntsDecoder {
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IntsDecoder {
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iter: values.move_iter()
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}
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}
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}
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impl Decoder<Error> for IntsDecoder {
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// Primitive types:
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fn read_nil(&mut self) -> Result<(), Error> { Err(SyntaxError) }
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fn read_uint(&mut self) -> Result<uint, Error> { Err(SyntaxError) }
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fn read_u64(&mut self) -> Result<u64, Error> { Err(SyntaxError) }
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fn read_u32(&mut self) -> Result<u32, Error> { Err(SyntaxError) }
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fn read_u16(&mut self) -> Result<u16, Error> { Err(SyntaxError) }
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fn read_u8(&mut self) -> Result<u8, Error> { Err(SyntaxError) }
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#[inline]
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fn read_int(&mut self) -> Result<int, Error> {
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match self.iter.next() {
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Some(value) => Ok(value),
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None => Err(EndOfStream),
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}
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}
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fn read_i64(&mut self) -> Result<i64, Error> { Err(SyntaxError) }
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fn read_i32(&mut self) -> Result<i32, Error> { Err(SyntaxError) }
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fn read_i16(&mut self) -> Result<i16, Error> { Err(SyntaxError) }
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fn read_i8(&mut self) -> Result<i8, Error> { Err(SyntaxError) }
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fn read_bool(&mut self) -> Result<bool, Error> { Err(SyntaxError) }
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fn read_f64(&mut self) -> Result<f64, Error> { Err(SyntaxError) }
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fn read_f32(&mut self) -> Result<f32, Error> { Err(SyntaxError) }
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fn read_char(&mut self) -> Result<char, Error> { Err(SyntaxError) }
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fn read_str(&mut self) -> Result<~str, Error> { Err(SyntaxError) }
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// Compound types:
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fn read_enum<T>(&mut self, _name: &str, _f: |&mut IntsDecoder| -> Result<T, Error>) -> Result<T, Error> { Err(SyntaxError) }
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fn read_enum_variant<T>(&mut self,
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_names: &[&str],
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_f: |&mut IntsDecoder, uint| -> Result<T, Error>)
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-> Result<T, Error> { Err(SyntaxError) }
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fn read_enum_variant_arg<T>(&mut self,
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_a_idx: uint,
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_f: |&mut IntsDecoder| -> Result<T, Error>)
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-> Result<T, Error> { Err(SyntaxError) }
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fn read_enum_struct_variant<T>(&mut self,
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_names: &[&str],
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_f: |&mut IntsDecoder, uint| -> Result<T, Error>)
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-> Result<T, Error> { Err(SyntaxError) }
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fn read_enum_struct_variant_field<T>(&mut self,
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_f_name: &str,
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_f_idx: uint,
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_f: |&mut IntsDecoder| -> Result<T, Error>)
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-> Result<T, Error> { Err(SyntaxError) }
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fn read_struct<T>(&mut self, _s_name: &str, _len: uint, _f: |&mut IntsDecoder| -> Result<T, Error>)
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-> Result<T, Error> { Err(SyntaxError) }
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fn read_struct_field<T>(&mut self,
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_f_name: &str,
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_f_idx: uint,
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_f: |&mut IntsDecoder| -> Result<T, Error>)
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-> Result<T, Error> { Err(SyntaxError) }
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fn read_tuple<T>(&mut self, _f: |&mut IntsDecoder, uint| -> Result<T, Error>) -> Result<T, Error> { Err(SyntaxError) }
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fn read_tuple_arg<T>(&mut self, _a_idx: uint, _f: |&mut IntsDecoder| -> Result<T, Error>) -> Result<T, Error> { Err(SyntaxError) }
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fn read_tuple_struct<T>(&mut self,
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_s_name: &str,
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_f: |&mut IntsDecoder, uint| -> Result<T, Error>)
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-> Result<T, Error> { Err(SyntaxError) }
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fn read_tuple_struct_arg<T>(&mut self,
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_a_idx: uint,
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_f: |&mut IntsDecoder| -> Result<T, Error>)
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-> Result<T, Error> { Err(SyntaxError) }
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// Specialized types:
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fn read_option<T>(&mut self, _f: |&mut IntsDecoder, bool| -> Result<T, Error>) -> Result<T, Error> { Err(SyntaxError) }
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#[inline]
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fn read_seq<T>(&mut self, f: |&mut IntsDecoder, uint| -> Result<T, Error>) -> Result<T, Error> {
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f(self, 3)
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}
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#[inline]
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fn read_seq_elt<T>(&mut self, _idx: uint, f: |&mut IntsDecoder| -> Result<T, Error>) -> Result<T, Error> {
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f(self)
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}
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fn read_map<T>(&mut self, _f: |&mut IntsDecoder, uint| -> Result<T, Error>) -> Result<T, Error> { Err(SyntaxError) }
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fn read_map_elt_key<T>(&mut self, _idx: uint, _f: |&mut IntsDecoder| -> Result<T, Error>) -> Result<T, Error> { Err(SyntaxError) }
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fn read_map_elt_val<T>(&mut self, _idx: uint, _f: |&mut IntsDecoder| -> Result<T, Error>) -> Result<T, Error> { Err(SyntaxError) }
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}
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#[test]
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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: Result<int, Error> = Deserializable::deserialize(&mut deserializer);
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assert_eq!(value.unwrap(), 5);
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}
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#[test]
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fn test_tokens_strbuf() {
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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: Result<StrBuf, Error> = Deserializable::deserialize(&mut deserializer);
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assert_eq!(value.unwrap(), "a".to_strbuf());
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}
|
|
|
|
|
|
#[test]
|
|
fn test_tokens_tuple_empty() {
|
|
let tokens = vec!(
|
|
CollectionStart,
|
|
CollectionEnd,
|
|
);
|
|
|
|
let mut deserializer = TokenDeserializer::new(tokens);
|
|
let value: Result<(), Error> = Deserializable::deserialize(&mut deserializer);
|
|
|
|
assert_eq!(value.unwrap(), ());
|
|
}
|
|
|
|
#[test]
|
|
fn test_tokens_tuple() {
|
|
let tokens = vec!(
|
|
CollectionStart,
|
|
CollectionSep,
|
|
Int(5),
|
|
|
|
CollectionSep,
|
|
StrBuf("a".to_strbuf()),
|
|
CollectionEnd,
|
|
);
|
|
|
|
let mut deserializer = TokenDeserializer::new(tokens);
|
|
let value: Result<(int, StrBuf), Error> = Deserializable::deserialize(&mut deserializer);
|
|
|
|
assert_eq!(value.unwrap(), (5, "a".to_strbuf()));
|
|
}
|
|
|
|
#[test]
|
|
fn test_tokens_tuple_compound() {
|
|
let tokens = vec!(
|
|
CollectionStart,
|
|
CollectionSep,
|
|
CollectionStart,
|
|
CollectionEnd,
|
|
|
|
CollectionSep,
|
|
CollectionStart,
|
|
CollectionSep,
|
|
Int(5),
|
|
CollectionSep,
|
|
StrBuf("a".to_strbuf()),
|
|
CollectionEnd,
|
|
CollectionEnd,
|
|
);
|
|
|
|
let mut deserializer = TokenDeserializer::new(tokens);
|
|
let value: Result<((), (int, StrBuf)), Error> = Deserializable::deserialize(&mut deserializer);
|
|
|
|
assert_eq!(value.unwrap(), ((), (5, "a".to_strbuf())));
|
|
}
|
|
|
|
#[test]
|
|
fn test_tokens_vec_empty() {
|
|
let tokens = vec!(
|
|
CollectionStart,
|
|
CollectionEnd,
|
|
);
|
|
|
|
let mut deserializer = TokenDeserializer::new(tokens);
|
|
let value: Result<Vec<int>, Error> = Deserializable::deserialize(&mut deserializer);
|
|
|
|
assert_eq!(value.unwrap(), vec!());
|
|
}
|
|
|
|
#[test]
|
|
fn test_tokens_vec() {
|
|
let tokens = vec!(
|
|
CollectionStart,
|
|
CollectionSep,
|
|
Int(5),
|
|
|
|
CollectionSep,
|
|
Int(6),
|
|
|
|
CollectionSep,
|
|
Int(7),
|
|
CollectionEnd,
|
|
);
|
|
|
|
let mut deserializer = TokenDeserializer::new(tokens);
|
|
let value: Result<Vec<int>, Error> = Deserializable::deserialize(&mut deserializer);
|
|
|
|
assert_eq!(value.unwrap(), vec!(5, 6, 7));
|
|
}
|
|
|
|
#[test]
|
|
fn test_tokens_vec_compound() {
|
|
let tokens = vec!(
|
|
CollectionStart,
|
|
CollectionSep,
|
|
CollectionStart,
|
|
CollectionSep,
|
|
Int(1),
|
|
CollectionEnd,
|
|
|
|
CollectionSep,
|
|
CollectionStart,
|
|
CollectionSep,
|
|
Int(2),
|
|
|
|
CollectionSep,
|
|
Int(3),
|
|
CollectionEnd,
|
|
|
|
CollectionSep,
|
|
CollectionStart,
|
|
CollectionSep,
|
|
Int(4),
|
|
|
|
CollectionSep,
|
|
Int(5),
|
|
|
|
CollectionSep,
|
|
Int(6),
|
|
CollectionEnd,
|
|
CollectionEnd,
|
|
);
|
|
|
|
let mut deserializer = TokenDeserializer::new(tokens);
|
|
let value: Result<Vec<Vec<int>>, Error> = Deserializable::deserialize(&mut deserializer);
|
|
|
|
assert_eq!(value.unwrap(), vec!(vec!(1), vec!(2, 3), vec!(4, 5, 6)));
|
|
}
|
|
|
|
#[test]
|
|
fn test_tokens_hashmap() {
|
|
let tokens = vec!(
|
|
CollectionStart,
|
|
CollectionSep,
|
|
CollectionStart,
|
|
CollectionSep,
|
|
Int(5),
|
|
|
|
CollectionSep,
|
|
StrBuf("a".to_strbuf()),
|
|
CollectionEnd,
|
|
|
|
CollectionSep,
|
|
CollectionStart,
|
|
CollectionSep,
|
|
Int(6),
|
|
|
|
CollectionSep,
|
|
StrBuf("b".to_strbuf()),
|
|
CollectionEnd,
|
|
CollectionEnd,
|
|
);
|
|
|
|
let mut deserializer = TokenDeserializer::new(tokens);
|
|
let value: Result<HashMap<int, StrBuf>, Error> = Deserializable::deserialize(&mut deserializer);
|
|
|
|
let mut map = HashMap::new();
|
|
map.insert(5, "a".to_strbuf());
|
|
map.insert(6, "b".to_strbuf());
|
|
|
|
assert_eq!(value.unwrap(), map);
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_dummy_deserializer(b: &mut Bencher) {
|
|
b.iter(|| {
|
|
let tokens = vec!(
|
|
CollectionStart,
|
|
CollectionSep,
|
|
Int(5),
|
|
|
|
CollectionSep,
|
|
Int(6),
|
|
|
|
CollectionSep,
|
|
Int(7),
|
|
CollectionEnd,
|
|
);
|
|
|
|
let mut d = TokenDeserializer::new(tokens);
|
|
let value: Result<Vec<int>, Error> = Deserializable::deserialize(&mut d);
|
|
|
|
assert_eq!(value.unwrap(), vec!(5, 6, 7));
|
|
})
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_ints_deserializer(b: &mut Bencher) {
|
|
b.iter(|| {
|
|
let ints = vec!(5, 6, 7);
|
|
|
|
let mut d = IntsDeserializer::new(ints);
|
|
let value: Result<Vec<int>, Error> = Deserializable::deserialize(&mut d);
|
|
|
|
assert_eq!(value.unwrap(), vec!(5, 6, 7));
|
|
})
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_ints_decoder(b: &mut Bencher) {
|
|
b.iter(|| {
|
|
let ints = vec!(5, 6, 7);
|
|
|
|
let mut d = IntsDecoder::new(ints);
|
|
let value: Result<Vec<int>, Error> = Decodable::decode(&mut d);
|
|
|
|
assert_eq!(value.unwrap(), vec!(5, 6, 7));
|
|
})
|
|
}
|
|
}
|