467 lines
14 KiB
Rust
467 lines
14 KiB
Rust
use test::Bencher;
|
|
use std::error;
|
|
use std::fmt;
|
|
use rustc_serialize::Decodable;
|
|
use serde;
|
|
use serde::de::Deserialize;
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
#[derive(Clone, PartialEq, Debug, RustcDecodable, Deserialize)]
|
|
pub enum Animal {
|
|
Dog,
|
|
Frog(String, isize)
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
#[derive(Debug)]
|
|
pub enum Error {
|
|
EndOfStream,
|
|
Syntax,
|
|
}
|
|
|
|
impl serde::de::Error for Error {
|
|
fn custom<T: Into<String>>(_: T) -> Error { Error::Syntax }
|
|
|
|
fn end_of_stream() -> Error { Error::EndOfStream }
|
|
|
|
fn unknown_field(_: &str) -> Error { Error::Syntax }
|
|
|
|
fn missing_field(_: &'static str) -> Error { Error::Syntax }
|
|
}
|
|
|
|
impl fmt::Display for Error {
|
|
fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
|
|
formatter.write_str(format!("{:?}", self).as_ref())
|
|
}
|
|
}
|
|
|
|
impl error::Error for Error {
|
|
fn description(&self) -> &str {
|
|
"Serde Deserialization Error"
|
|
}
|
|
|
|
fn cause(&self) -> Option<&error::Error> {
|
|
None
|
|
}
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
mod decoder {
|
|
use rustc_serialize::Decoder;
|
|
|
|
use super::{Animal, Error};
|
|
use super::Animal::{Dog, Frog};
|
|
|
|
enum State {
|
|
Animal(Animal),
|
|
Isize(isize),
|
|
String(String),
|
|
}
|
|
|
|
pub struct AnimalDecoder {
|
|
stack: Vec<State>,
|
|
|
|
}
|
|
|
|
impl AnimalDecoder {
|
|
#[inline]
|
|
pub fn new(animal: Animal) -> AnimalDecoder {
|
|
AnimalDecoder {
|
|
stack: vec!(State::Animal(animal)),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Decoder for AnimalDecoder {
|
|
type Error = Error;
|
|
|
|
fn error(&mut self, _: &str) -> Error { Error::Syntax }
|
|
|
|
// Primitive types:
|
|
fn read_nil(&mut self) -> Result<(), Error> { Err(Error::Syntax) }
|
|
fn read_usize(&mut self) -> Result<usize, Error> { Err(Error::Syntax) }
|
|
fn read_u64(&mut self) -> Result<u64, Error> { Err(Error::Syntax) }
|
|
fn read_u32(&mut self) -> Result<u32, Error> { Err(Error::Syntax) }
|
|
fn read_u16(&mut self) -> Result<u16, Error> { Err(Error::Syntax) }
|
|
fn read_u8(&mut self) -> Result<u8, Error> { Err(Error::Syntax) }
|
|
#[inline]
|
|
fn read_isize(&mut self) -> Result<isize, Error> {
|
|
match self.stack.pop() {
|
|
Some(State::Isize(x)) => Ok(x),
|
|
_ => Err(Error::Syntax),
|
|
}
|
|
}
|
|
fn read_i64(&mut self) -> Result<i64, Error> { Err(Error::Syntax) }
|
|
fn read_i32(&mut self) -> Result<i32, Error> { Err(Error::Syntax) }
|
|
fn read_i16(&mut self) -> Result<i16, Error> { Err(Error::Syntax) }
|
|
fn read_i8(&mut self) -> Result<i8, Error> { Err(Error::Syntax) }
|
|
fn read_bool(&mut self) -> Result<bool, Error> { Err(Error::Syntax) }
|
|
fn read_f64(&mut self) -> Result<f64, Error> { Err(Error::Syntax) }
|
|
fn read_f32(&mut self) -> Result<f32, Error> { Err(Error::Syntax) }
|
|
fn read_char(&mut self) -> Result<char, Error> { Err(Error::Syntax) }
|
|
#[inline]
|
|
fn read_str(&mut self) -> Result<String, Error> {
|
|
match self.stack.pop() {
|
|
Some(State::String(x)) => Ok(x),
|
|
_ => Err(Error::Syntax),
|
|
}
|
|
}
|
|
|
|
// Compound types:
|
|
#[inline]
|
|
fn read_enum<T, F>(&mut self, name: &str, f: F) -> Result<T, Error> where
|
|
F: FnOnce(&mut AnimalDecoder) -> Result<T, Error>,
|
|
{
|
|
match self.stack.pop() {
|
|
Some(State::Animal(animal)) => {
|
|
self.stack.push(State::Animal(animal));
|
|
if name == "Animal" {
|
|
f(self)
|
|
} else {
|
|
Err(Error::Syntax)
|
|
}
|
|
}
|
|
_ => Err(Error::Syntax)
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
fn read_enum_variant<T, F>(&mut self, names: &[&str], f: F) -> Result<T, Error> where
|
|
F: FnOnce(&mut AnimalDecoder, usize) -> Result<T, Error>,
|
|
{
|
|
let name = match self.stack.pop() {
|
|
Some(State::Animal(Dog)) => "Dog",
|
|
Some(State::Animal(Frog(x0, x1))) => {
|
|
self.stack.push(State::Isize(x1));
|
|
self.stack.push(State::String(x0));
|
|
"Frog"
|
|
}
|
|
_ => { return Err(Error::Syntax); }
|
|
};
|
|
|
|
let idx = match names.iter().position(|n| *n == name) {
|
|
Some(idx) => idx,
|
|
None => { return Err(Error::Syntax); }
|
|
};
|
|
|
|
f(self, idx)
|
|
}
|
|
|
|
#[inline]
|
|
fn read_enum_variant_arg<T, F>(&mut self, _a_idx: usize, f: F) -> Result<T, Error> where
|
|
F: FnOnce(&mut AnimalDecoder) -> Result<T, Error>,
|
|
{
|
|
f(self)
|
|
}
|
|
|
|
fn read_enum_struct_variant<T, F>(&mut self, _names: &[&str], _f: F) -> Result<T, Error> where
|
|
F: FnOnce(&mut AnimalDecoder, usize) -> Result<T, Error>,
|
|
{
|
|
Err(Error::Syntax)
|
|
}
|
|
|
|
fn read_enum_struct_variant_field<T, F>(&mut self, _f_name: &str, _f_idx: usize, _f: F) -> Result<T, Error> where
|
|
F: FnOnce(&mut AnimalDecoder) -> Result<T, Error>,
|
|
{
|
|
Err(Error::Syntax)
|
|
}
|
|
|
|
fn read_struct<T, F>(&mut self, _s_name: &str, _len: usize, _f: F) -> Result<T, Error> where
|
|
F: FnOnce(&mut AnimalDecoder) -> Result<T, Error>,
|
|
{
|
|
Err(Error::Syntax)
|
|
}
|
|
|
|
fn read_struct_field<T, F>(&mut self, _f_name: &str, _f_idx: usize, _f: F) -> Result<T, Error> where
|
|
F: FnOnce(&mut AnimalDecoder) -> Result<T, Error>,
|
|
{
|
|
Err(Error::Syntax)
|
|
}
|
|
|
|
fn read_tuple<T, F>(&mut self, _len: usize, _f: F) -> Result<T, Error> where
|
|
F: FnOnce(&mut AnimalDecoder) -> Result<T, Error>,
|
|
{
|
|
Err(Error::Syntax)
|
|
}
|
|
|
|
fn read_tuple_arg<T, F>(&mut self, _a_idx: usize, _f: F) -> Result<T, Error> where
|
|
F: FnOnce(&mut AnimalDecoder) -> Result<T, Error>,
|
|
{
|
|
Err(Error::Syntax)
|
|
}
|
|
|
|
fn read_tuple_struct<T, F>(&mut self, _s_name: &str, _len: usize, _f: F) -> Result<T, Error> where
|
|
F: FnOnce(&mut AnimalDecoder) -> Result<T, Error>,
|
|
{
|
|
Err(Error::Syntax)
|
|
}
|
|
|
|
fn read_tuple_struct_arg<T, F>(&mut self, _a_idx: usize, _f: F) -> Result<T, Error> where
|
|
F: FnOnce(&mut AnimalDecoder) -> Result<T, Error>,
|
|
{
|
|
Err(Error::Syntax)
|
|
}
|
|
|
|
// Specialized types:
|
|
fn read_option<T, F>(&mut self, _f: F) -> Result<T, Error> where
|
|
F: FnOnce(&mut AnimalDecoder, bool) -> Result<T, Error>,
|
|
{
|
|
Err(Error::Syntax)
|
|
}
|
|
|
|
#[inline]
|
|
fn read_seq<T, F>(&mut self, f: F) -> Result<T, Error> where
|
|
F: FnOnce(&mut AnimalDecoder, usize) -> Result<T, Error>,
|
|
{
|
|
f(self, 3)
|
|
}
|
|
|
|
#[inline]
|
|
fn read_seq_elt<T, F>(&mut self, _idx: usize, f: F) -> Result<T, Error> where
|
|
F: FnOnce(&mut AnimalDecoder) -> Result<T, Error>,
|
|
{
|
|
f(self)
|
|
}
|
|
|
|
fn read_map<T, F>(&mut self, _f: F) -> Result<T, Error> where
|
|
F: FnOnce(&mut AnimalDecoder, usize) -> Result<T, Error>,
|
|
{
|
|
Err(Error::Syntax)
|
|
}
|
|
|
|
fn read_map_elt_key<T, F>(&mut self, _idx: usize, _f: F) -> Result<T, Error> where
|
|
F: FnOnce(&mut AnimalDecoder) -> Result<T, Error>,
|
|
{
|
|
Err(Error::Syntax)
|
|
}
|
|
|
|
fn read_map_elt_val<T, F>(&mut self, _idx: usize, _f: F) -> Result<T, Error> where
|
|
F: FnOnce(&mut AnimalDecoder) -> Result<T, Error>,
|
|
{
|
|
Err(Error::Syntax)
|
|
}
|
|
}
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
mod deserializer {
|
|
use super::{Animal, Error};
|
|
|
|
use serde::de;
|
|
|
|
#[derive(Debug)]
|
|
enum State {
|
|
Animal(Animal),
|
|
Isize(isize),
|
|
Str(&'static str),
|
|
String(String),
|
|
UnitState,
|
|
}
|
|
|
|
pub struct AnimalDeserializer {
|
|
stack: Vec<State>,
|
|
}
|
|
|
|
impl AnimalDeserializer {
|
|
#[inline]
|
|
pub fn new(animal: Animal) -> AnimalDeserializer {
|
|
AnimalDeserializer {
|
|
stack: vec!(State::Animal(animal)),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl de::Deserializer for AnimalDeserializer {
|
|
type Error = Error;
|
|
|
|
#[inline]
|
|
fn deserialize<V>(&mut self, mut visitor: V) -> Result<V::Value, Error>
|
|
where V: de::Visitor,
|
|
{
|
|
match self.stack.pop() {
|
|
Some(State::Isize(value)) => {
|
|
visitor.visit_isize(value)
|
|
}
|
|
Some(State::String(value)) => {
|
|
visitor.visit_string(value)
|
|
}
|
|
Some(State::Str(value)) => {
|
|
visitor.visit_str(value)
|
|
}
|
|
Some(State::UnitState) => {
|
|
visitor.visit_unit()
|
|
}
|
|
Some(_) => {
|
|
Err(Error::Syntax)
|
|
}
|
|
None => {
|
|
Err(Error::EndOfStream)
|
|
}
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
fn deserialize_enum<V>(&mut self,
|
|
_name: &str,
|
|
_variants: &[&str],
|
|
mut visitor: V) -> Result<V::Value, Error>
|
|
where V: de::EnumVisitor,
|
|
{
|
|
match self.stack.pop() {
|
|
Some(State::Animal(Animal::Dog)) => {
|
|
self.stack.push(State::UnitState);
|
|
self.stack.push(State::Str("Dog"));
|
|
visitor.visit(DogVisitor {
|
|
de: self,
|
|
})
|
|
}
|
|
Some(State::Animal(Animal::Frog(x0, x1))) => {
|
|
self.stack.push(State::Isize(x1));
|
|
self.stack.push(State::String(x0));
|
|
self.stack.push(State::Str("Frog"));
|
|
visitor.visit(FrogVisitor {
|
|
de: self,
|
|
state: 0,
|
|
})
|
|
}
|
|
Some(_) => {
|
|
Err(Error::Syntax)
|
|
}
|
|
None => {
|
|
Err(Error::EndOfStream)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
struct DogVisitor<'a> {
|
|
de: &'a mut AnimalDeserializer,
|
|
}
|
|
|
|
impl<'a> de::VariantVisitor for DogVisitor<'a> {
|
|
type Error = Error;
|
|
|
|
fn visit_variant<V>(&mut self) -> Result<V, Error>
|
|
where V: de::Deserialize
|
|
{
|
|
de::Deserialize::deserialize(self.de)
|
|
}
|
|
|
|
fn visit_unit(&mut self) -> Result<(), Error> {
|
|
de::Deserialize::deserialize(self.de)
|
|
}
|
|
}
|
|
|
|
struct FrogVisitor<'a> {
|
|
de: &'a mut AnimalDeserializer,
|
|
state: usize,
|
|
}
|
|
|
|
impl<'a> de::VariantVisitor for FrogVisitor<'a> {
|
|
type Error = Error;
|
|
|
|
fn visit_variant<V>(&mut self) -> Result<V, Error>
|
|
where V: de::Deserialize
|
|
{
|
|
de::Deserialize::deserialize(self.de)
|
|
}
|
|
|
|
fn visit_tuple<V>(&mut self,
|
|
_len: usize,
|
|
mut visitor: V) -> Result<V::Value, Error>
|
|
where V: de::Visitor,
|
|
{
|
|
visitor.visit_seq(self)
|
|
}
|
|
}
|
|
|
|
impl<'a> de::SeqVisitor for FrogVisitor<'a> {
|
|
type Error = Error;
|
|
|
|
fn visit<T>(&mut self) -> Result<Option<T>, Error>
|
|
where T: de::Deserialize,
|
|
{
|
|
match self.state {
|
|
0 => {
|
|
self.state += 1;
|
|
Ok(Some(try!(de::Deserialize::deserialize(self.de))))
|
|
}
|
|
1 => {
|
|
self.state += 1;
|
|
Ok(Some(try!(de::Deserialize::deserialize(self.de))))
|
|
}
|
|
_ => {
|
|
Ok(None)
|
|
}
|
|
}
|
|
}
|
|
|
|
fn end(&mut self) -> Result<(), Error> {
|
|
if self.state == 2 {
|
|
Ok(())
|
|
} else {
|
|
Err(Error::Syntax)
|
|
}
|
|
}
|
|
|
|
fn size_hint(&self) -> (usize, Option<usize>) {
|
|
let len = 2 - self.state;
|
|
(len, Some(len))
|
|
}
|
|
}
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
#[bench]
|
|
fn bench_decoder_dog(b: &mut Bencher) {
|
|
b.iter(|| {
|
|
let animal = Animal::Dog;
|
|
|
|
let mut d = decoder::AnimalDecoder::new(animal.clone());
|
|
let value: Animal = Decodable::decode(&mut d).unwrap();
|
|
|
|
assert_eq!(value, animal);
|
|
})
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_decoder_frog(b: &mut Bencher) {
|
|
b.iter(|| {
|
|
let animal = Animal::Frog("Henry".to_owned(), 349);
|
|
|
|
let mut d = decoder::AnimalDecoder::new(animal.clone());
|
|
let value: Animal = Decodable::decode(&mut d).unwrap();
|
|
|
|
assert_eq!(value, animal);
|
|
})
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_deserializer_dog(b: &mut Bencher) {
|
|
b.iter(|| {
|
|
let animal = Animal::Dog;
|
|
|
|
let mut d = deserializer::AnimalDeserializer::new(animal.clone());
|
|
let value: Animal = Deserialize::deserialize(&mut d).unwrap();
|
|
|
|
assert_eq!(value, animal);
|
|
})
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_deserializer_frog(b: &mut Bencher) {
|
|
b.iter(|| {
|
|
let animal = Animal::Frog("Henry".to_owned(), 349);
|
|
|
|
let mut d = deserializer::AnimalDeserializer::new(animal.clone());
|
|
let value: Animal = Deserialize::deserialize(&mut d).unwrap();
|
|
|
|
assert_eq!(value, animal);
|
|
})
|
|
}
|