746 lines
22 KiB
Rust
746 lines
22 KiB
Rust
#![feature(custom_derive, plugin, test)]
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#![plugin(serde_macros)]
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extern crate serde;
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extern crate rustc_serialize;
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extern crate test;
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use std::collections::HashMap;
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use test::Bencher;
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use rustc_serialize::{Decoder, Decodable};
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use serde::de::{Deserializer, Deserialize};
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//////////////////////////////////////////////////////////////////////////////
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#[derive(Clone, PartialEq, Debug, RustcDecodable, Deserialize)]
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pub struct Inner {
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a: (),
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b: usize,
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c: HashMap<String, Option<char>>,
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}
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//////////////////////////////////////////////////////////////////////////////
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#[derive(Clone, PartialEq, Debug, RustcDecodable, Deserialize)]
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pub struct Outer {
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inner: Vec<Inner>,
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}
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//////////////////////////////////////////////////////////////////////////////
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#[derive(Debug, PartialEq)]
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pub enum Error {
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EndOfStream,
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SyntaxError,
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UnexpectedName,
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ConversionError,
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MissingField,
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OtherError,
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}
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impl serde::de::Error for Error {
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fn syntax_error() -> Error { Error::SyntaxError }
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fn end_of_stream_error() -> Error { Error::EndOfStream }
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fn unknown_field_error(_: &str) -> Error { Error::SyntaxError }
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fn missing_field_error(_: &'static str) -> Error {
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Error::MissingField
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}
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}
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mod decoder {
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use std::collections::HashMap;
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use rustc_serialize::Decoder;
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use super::{Outer, Inner, Error};
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use self::State::{
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OuterState,
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InnerState,
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NullState,
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UsizeState,
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CharState,
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StringState,
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FieldState,
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VecState,
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MapState,
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OptionState,
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};
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#[derive(Debug)]
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enum State {
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OuterState(Outer),
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InnerState(Inner),
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NullState,
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UsizeState(usize),
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CharState(char),
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StringState(String),
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FieldState(&'static str),
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VecState(Vec<Inner>),
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MapState(HashMap<String, Option<char>>),
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OptionState(bool),
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}
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pub struct OuterDecoder {
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stack: Vec<State>,
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}
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impl OuterDecoder {
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#[inline]
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pub fn new(animal: Outer) -> OuterDecoder {
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OuterDecoder {
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stack: vec!(OuterState(animal)),
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}
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}
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}
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impl Decoder for OuterDecoder {
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type Error = Error;
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fn error(&mut self, _msg: &str) -> Error {
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Error::OtherError
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}
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// Primitive types:
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#[inline]
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fn read_nil(&mut self) -> Result<(), Error> {
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match self.stack.pop() {
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Some(NullState) => Ok(()),
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_ => Err(Error::SyntaxError),
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}
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}
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#[inline]
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fn read_usize(&mut self) -> Result<usize, Error> {
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match self.stack.pop() {
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Some(UsizeState(value)) => Ok(value),
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_ => Err(Error::SyntaxError),
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}
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}
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fn read_u64(&mut self) -> Result<u64, Error> { Err(Error::SyntaxError) }
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fn read_u32(&mut self) -> Result<u32, Error> { Err(Error::SyntaxError) }
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fn read_u16(&mut self) -> Result<u16, Error> { Err(Error::SyntaxError) }
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fn read_u8(&mut self) -> Result<u8, Error> { Err(Error::SyntaxError) }
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fn read_isize(&mut self) -> Result<isize, Error> { Err(Error::SyntaxError) }
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fn read_i64(&mut self) -> Result<i64, Error> { Err(Error::SyntaxError) }
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fn read_i32(&mut self) -> Result<i32, Error> { Err(Error::SyntaxError) }
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fn read_i16(&mut self) -> Result<i16, Error> { Err(Error::SyntaxError) }
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fn read_i8(&mut self) -> Result<i8, Error> { Err(Error::SyntaxError) }
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fn read_bool(&mut self) -> Result<bool, Error> { Err(Error::SyntaxError) }
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fn read_f64(&mut self) -> Result<f64, Error> { Err(Error::SyntaxError) }
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fn read_f32(&mut self) -> Result<f32, Error> { Err(Error::SyntaxError) }
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#[inline]
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fn read_char(&mut self) -> Result<char, Error> {
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match self.stack.pop() {
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Some(CharState(c)) => Ok(c),
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_ => Err(Error::SyntaxError),
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}
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}
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#[inline]
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fn read_str(&mut self) -> Result<String, Error> {
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match self.stack.pop() {
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Some(StringState(value)) => Ok(value),
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_ => Err(Error::SyntaxError),
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}
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}
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// Compound types:
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fn read_enum<T, F>(&mut self, _name: &str, _f: F) -> Result<T, Error> where
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F: FnOnce(&mut OuterDecoder) -> Result<T, Error>,
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{
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Err(Error::SyntaxError)
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}
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fn read_enum_variant<T, F>(&mut self, _names: &[&str], _f: F) -> Result<T, Error> where
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F: FnOnce(&mut OuterDecoder, usize) -> Result<T, Error>,
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{
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Err(Error::SyntaxError)
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}
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fn read_enum_variant_arg<T, F>(&mut self, _a_idx: usize, _f: F) -> Result<T, Error> where
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F: FnOnce(&mut OuterDecoder) -> Result<T, Error>,
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{
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Err(Error::SyntaxError)
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}
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fn read_enum_struct_variant<T, F>(&mut self, _names: &[&str], _f: F) -> Result<T, Error> where
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F: FnOnce(&mut OuterDecoder, usize) -> Result<T, Error>,
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{
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Err(Error::SyntaxError)
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}
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fn read_enum_struct_variant_field<T, F>(&mut self, _f_name: &str, _f_idx: usize, _f: F) -> Result<T, Error> where
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F: FnOnce(&mut OuterDecoder) -> Result<T, Error>,
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{
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Err(Error::SyntaxError)
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}
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#[inline]
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fn read_struct<T, F>(&mut self, s_name: &str, _len: usize, f: F) -> Result<T, Error> where
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F: FnOnce(&mut OuterDecoder) -> Result<T, Error>,
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{
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match self.stack.pop() {
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Some(OuterState(Outer { inner })) => {
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if s_name == "Outer" {
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self.stack.push(VecState(inner));
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self.stack.push(FieldState("inner"));
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f(self)
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} else {
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Err(Error::SyntaxError)
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}
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}
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Some(InnerState(Inner { a: (), b, c })) => {
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if s_name == "Inner" {
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self.stack.push(MapState(c));
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self.stack.push(FieldState("c"));
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self.stack.push(UsizeState(b));
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self.stack.push(FieldState("b"));
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self.stack.push(NullState);
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self.stack.push(FieldState("a"));
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f(self)
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} else {
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Err(Error::SyntaxError)
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}
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}
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_ => Err(Error::SyntaxError),
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}
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}
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#[inline]
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fn read_struct_field<T, F>(&mut self, f_name: &str, _f_idx: usize, f: F) -> Result<T, Error> where
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F: FnOnce(&mut OuterDecoder) -> Result<T, Error>,
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{
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match self.stack.pop() {
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Some(FieldState(name)) => {
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if f_name == name {
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f(self)
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} else {
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Err(Error::SyntaxError)
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}
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}
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_ => Err(Error::SyntaxError)
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}
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}
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fn read_tuple<T, F>(&mut self, _len: usize, _f: F) -> Result<T, Error> where
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F: FnOnce(&mut OuterDecoder) -> Result<T, Error>,
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{
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Err(Error::SyntaxError)
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}
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fn read_tuple_arg<T, F>(&mut self, _a_idx: usize, _f: F) -> Result<T, Error> where
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F: FnOnce(&mut OuterDecoder) -> Result<T, Error>,
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{
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Err(Error::SyntaxError)
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}
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fn read_tuple_struct<T, F>(&mut self, _s_name: &str, _len: usize, _f: F) -> Result<T, Error> where
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F: FnOnce(&mut OuterDecoder) -> Result<T, Error>,
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{
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Err(Error::SyntaxError)
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}
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fn read_tuple_struct_arg<T, F>(&mut self, _a_idx: usize, _f: F) -> Result<T, Error> where
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F: FnOnce(&mut OuterDecoder) -> Result<T, Error>,
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{
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Err(Error::SyntaxError)
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}
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// Specialized types:
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#[inline]
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fn read_option<T, F>(&mut self, f: F) -> Result<T, Error> where
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F: FnOnce(&mut OuterDecoder, bool) -> Result<T, Error>,
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{
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match self.stack.pop() {
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Some(OptionState(b)) => f(self, b),
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_ => Err(Error::SyntaxError),
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}
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}
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#[inline]
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fn read_seq<T, F>(&mut self, f: F) -> Result<T, Error> where
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F: FnOnce(&mut OuterDecoder, usize) -> Result<T, Error>,
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{
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match self.stack.pop() {
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Some(VecState(value)) => {
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let len = value.len();
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for inner in value.into_iter().rev() {
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self.stack.push(InnerState(inner));
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}
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f(self, len)
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}
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_ => Err(Error::SyntaxError)
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}
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}
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#[inline]
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fn read_seq_elt<T, F>(&mut self, _idx: usize, f: F) -> Result<T, Error> where
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F: FnOnce(&mut OuterDecoder) -> Result<T, Error>,
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{
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f(self)
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}
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#[inline]
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fn read_map<T, F>(&mut self, f: F) -> Result<T, Error> where
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F: FnOnce(&mut OuterDecoder, usize) -> Result<T, Error>,
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{
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match self.stack.pop() {
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Some(MapState(map)) => {
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let len = map.len();
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for (key, value) in map {
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match value {
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Some(c) => {
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self.stack.push(CharState(c));
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self.stack.push(OptionState(true));
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}
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None => {
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self.stack.push(OptionState(false));
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}
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}
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self.stack.push(StringState(key));
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}
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f(self, len)
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}
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_ => Err(Error::SyntaxError),
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}
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}
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#[inline]
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fn read_map_elt_key<T, F>(&mut self, _idx: usize, f: F) -> Result<T, Error> where
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F: FnOnce(&mut OuterDecoder) -> Result<T, Error>,
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{
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f(self)
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}
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#[inline]
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fn read_map_elt_val<T, F>(&mut self, _idx: usize, f: F) -> Result<T, Error> where
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F: FnOnce(&mut OuterDecoder) -> Result<T, Error>,
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{
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f(self)
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}
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}
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}
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//////////////////////////////////////////////////////////////////////////////
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mod deserializer {
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use std::collections::HashMap;
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use std::collections::hash_map;
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use std::vec;
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use super::{Outer, Inner};
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use super::Error;
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use serde::de;
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#[derive(Debug)]
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enum State {
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OuterState(Outer),
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InnerState(Inner),
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StrState(&'static str),
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NullState,
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UsizeState(usize),
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CharState(char),
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StringState(String),
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OptionState(bool),
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VecState(Vec<Inner>),
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MapState(HashMap<String, Option<char>>),
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}
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pub struct OuterDeserializer {
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stack: Vec<State>,
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}
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impl OuterDeserializer {
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#[inline]
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pub fn new(outer: Outer) -> OuterDeserializer {
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OuterDeserializer {
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stack: vec!(State::OuterState(outer)),
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}
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}
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}
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impl de::Deserializer for OuterDeserializer {
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type Error = Error;
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fn visit<V>(&mut self, mut visitor: V) -> Result<V::Value, Error>
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where V: de::Visitor,
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{
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match self.stack.pop() {
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Some(State::VecState(value)) => {
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visitor.visit_seq(OuterSeqVisitor {
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de: self,
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iter: value.into_iter(),
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})
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}
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Some(State::MapState(value)) => {
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visitor.visit_map(MapVisitor {
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de: self,
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iter: value.into_iter(),
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})
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}
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Some(State::NullState) => {
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visitor.visit_unit()
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}
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Some(State::UsizeState(x)) => {
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visitor.visit_usize(x)
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}
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Some(State::CharState(x)) => {
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visitor.visit_char(x)
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}
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Some(State::StrState(x)) => {
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visitor.visit_str(x)
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}
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Some(State::StringState(x)) => {
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visitor.visit_string(x)
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}
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Some(State::OptionState(false)) => {
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visitor.visit_none()
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}
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Some(State::OptionState(true)) => {
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visitor.visit_some(self)
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}
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Some(_) => Err(Error::SyntaxError),
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None => Err(Error::EndOfStream),
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}
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}
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fn visit_named_map<V>(&mut self, name: &str, mut visitor: V) -> Result<V::Value, Error>
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where V: de::Visitor,
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{
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match self.stack.pop() {
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Some(State::OuterState(Outer { inner })) => {
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if name != "Outer" {
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return Err(Error::SyntaxError);
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}
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self.stack.push(State::VecState(inner));
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self.stack.push(State::StrState("inner"));
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visitor.visit_map(OuterMapVisitor {
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de: self,
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state: 0,
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})
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}
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Some(State::InnerState(Inner { a: (), b, c })) => {
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if name != "Inner" {
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return Err(Error::SyntaxError);
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}
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self.stack.push(State::MapState(c));
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self.stack.push(State::StrState("c"));
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self.stack.push(State::UsizeState(b));
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self.stack.push(State::StrState("b"));
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self.stack.push(State::NullState);
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self.stack.push(State::StrState("a"));
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visitor.visit_map(InnerMapVisitor {
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de: self,
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state: 0,
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})
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}
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_ => {
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Err(Error::SyntaxError)
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}
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}
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}
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}
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struct OuterMapVisitor<'a> {
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de: &'a mut OuterDeserializer,
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state: usize,
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}
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impl<'a> de::MapVisitor for OuterMapVisitor<'a> {
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type Error = Error;
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fn visit_key<K>(&mut self) -> Result<Option<K>, Error>
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where K: de::Deserialize,
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{
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match self.state {
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0 => {
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self.state += 1;
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Ok(Some(try!(de::Deserialize::deserialize(self.de))))
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}
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_ => {
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Ok(None)
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}
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}
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}
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|
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fn visit_value<V>(&mut self) -> Result<V, Error>
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|
where V: de::Deserialize,
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{
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de::Deserialize::deserialize(self.de)
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}
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fn end(&mut self) -> Result<(), Error> {
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if self.state == 1 {
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Ok(())
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} else {
|
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Err(Error::SyntaxError)
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}
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}
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|
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fn size_hint(&self) -> (usize, Option<usize>) {
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let len = 1 - self.state;
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(len, Some(len))
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}
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}
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|
|
|
struct OuterSeqVisitor<'a> {
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|
de: &'a mut OuterDeserializer,
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iter: vec::IntoIter<Inner>,
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}
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|
|
|
impl<'a> de::SeqVisitor for OuterSeqVisitor<'a> {
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|
type Error = Error;
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|
|
|
fn visit<T>(&mut self) -> Result<Option<T>, Error>
|
|
where T: de::Deserialize,
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|
{
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|
match self.iter.next() {
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Some(value) => {
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self.de.stack.push(State::InnerState(value));
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Ok(Some(try!(de::Deserialize::deserialize(self.de))))
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}
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None => {
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Ok(None)
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}
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}
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}
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|
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fn end(&mut self) -> Result<(), Error> {
|
|
match self.iter.next() {
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Some(_) => Err(Error::SyntaxError),
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None => Ok(()),
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}
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}
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|
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fn size_hint(&self) -> (usize, Option<usize>) {
|
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self.iter.size_hint()
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}
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}
|
|
|
|
struct InnerMapVisitor<'a> {
|
|
de: &'a mut OuterDeserializer,
|
|
state: usize,
|
|
}
|
|
|
|
impl<'a> de::MapVisitor for InnerMapVisitor<'a> {
|
|
type Error = Error;
|
|
|
|
fn visit_key<K>(&mut self) -> Result<Option<K>, Error>
|
|
where K: de::Deserialize,
|
|
{
|
|
match self.state {
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|
0 ... 2 => {
|
|
self.state += 1;
|
|
Ok(Some(try!(de::Deserialize::deserialize(self.de))))
|
|
}
|
|
_ => {
|
|
Ok(None)
|
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}
|
|
}
|
|
}
|
|
|
|
fn visit_value<V>(&mut self) -> Result<V, Error>
|
|
where V: de::Deserialize,
|
|
{
|
|
de::Deserialize::deserialize(self.de)
|
|
}
|
|
|
|
fn end(&mut self) -> Result<(), Error> {
|
|
if self.state == 3 {
|
|
Ok(())
|
|
} else {
|
|
Err(Error::SyntaxError)
|
|
}
|
|
}
|
|
|
|
fn size_hint(&self) -> (usize, Option<usize>) {
|
|
let len = 1 - self.state;
|
|
(len, Some(len))
|
|
}
|
|
}
|
|
|
|
struct MapVisitor<'a> {
|
|
de: &'a mut OuterDeserializer,
|
|
iter: hash_map::IntoIter<String, Option<char>>,
|
|
}
|
|
|
|
impl<'a> de::MapVisitor for MapVisitor<'a> {
|
|
type Error = Error;
|
|
|
|
fn visit_key<K>(&mut self) -> Result<Option<K>, Error>
|
|
where K: de::Deserialize,
|
|
{
|
|
match self.iter.next() {
|
|
Some((key, Some(value))) => {
|
|
self.de.stack.push(State::CharState(value));
|
|
self.de.stack.push(State::OptionState(true));
|
|
self.de.stack.push(State::StringState(key));
|
|
Ok(Some(try!(de::Deserialize::deserialize(self.de))))
|
|
}
|
|
Some((key, None)) => {
|
|
self.de.stack.push(State::OptionState(false));
|
|
self.de.stack.push(State::StringState(key));
|
|
Ok(Some(try!(de::Deserialize::deserialize(self.de))))
|
|
}
|
|
None => {
|
|
Ok(None)
|
|
}
|
|
}
|
|
}
|
|
|
|
fn visit_value<V>(&mut self) -> Result<V, Error>
|
|
where V: de::Deserialize,
|
|
{
|
|
de::Deserialize::deserialize(self.de)
|
|
}
|
|
|
|
fn end(&mut self) -> Result<(), Error> {
|
|
match self.iter.next() {
|
|
Some(_) => Err(Error::SyntaxError),
|
|
None => Ok(()),
|
|
}
|
|
}
|
|
|
|
fn size_hint(&self) -> (usize, Option<usize>) {
|
|
self.iter.size_hint()
|
|
}
|
|
}
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_decoder_0_0(b: &mut Bencher) {
|
|
b.iter(|| {
|
|
let mut map = HashMap::new();
|
|
map.insert("abc".to_string(), Some('c'));
|
|
|
|
let outer = Outer {
|
|
inner: vec!(),
|
|
};
|
|
|
|
let mut d = decoder::OuterDecoder::new(outer.clone());
|
|
let value: Result<Outer, Error> = Decodable::decode(&mut d);
|
|
|
|
assert_eq!(value, Ok(outer));
|
|
})
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_decoder_1_0(b: &mut Bencher) {
|
|
b.iter(|| {
|
|
let map = HashMap::new();
|
|
|
|
let outer = Outer {
|
|
inner: vec!(
|
|
Inner {
|
|
a: (),
|
|
b: 5,
|
|
c: map,
|
|
},
|
|
)
|
|
};
|
|
|
|
let mut d = decoder::OuterDecoder::new(outer.clone());
|
|
let value: Result<Outer, Error> = Decodable::decode(&mut d);
|
|
|
|
assert_eq!(value, Ok(outer));
|
|
})
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_decoder_1_5(b: &mut Bencher) {
|
|
b.iter(|| {
|
|
let mut map = HashMap::new();
|
|
map.insert("1".to_string(), Some('a'));
|
|
map.insert("2".to_string(), None);
|
|
map.insert("3".to_string(), Some('b'));
|
|
map.insert("4".to_string(), None);
|
|
map.insert("5".to_string(), Some('c'));
|
|
|
|
let outer = Outer {
|
|
inner: vec!(
|
|
Inner {
|
|
a: (),
|
|
b: 5,
|
|
c: map,
|
|
},
|
|
)
|
|
};
|
|
|
|
let mut d = decoder::OuterDecoder::new(outer.clone());
|
|
let value: Result<Outer, Error> = Decodable::decode(&mut d);
|
|
|
|
assert_eq!(value, Ok(outer));
|
|
})
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_deserializer_0_0(b: &mut Bencher) {
|
|
b.iter(|| {
|
|
let outer = Outer {
|
|
inner: vec!(),
|
|
};
|
|
|
|
let mut d = deserializer::OuterDeserializer::new(outer.clone());
|
|
let value: Result<Outer, Error> = Deserialize::deserialize(&mut d);
|
|
|
|
assert_eq!(value, Ok(outer));
|
|
})
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_deserializer_1_0(b: &mut Bencher) {
|
|
b.iter(|| {
|
|
let map = HashMap::new();
|
|
|
|
let outer = Outer {
|
|
inner: vec!(
|
|
Inner {
|
|
a: (),
|
|
b: 5,
|
|
c: map,
|
|
},
|
|
)
|
|
};
|
|
|
|
let mut d = deserializer::OuterDeserializer::new(outer.clone());
|
|
let value: Result<Outer, Error> = Deserialize::deserialize(&mut d);
|
|
|
|
assert_eq!(value, Ok(outer));
|
|
})
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_deserializer_1_5(b: &mut Bencher) {
|
|
b.iter(|| {
|
|
let mut map = HashMap::new();
|
|
map.insert("1".to_string(), Some('a'));
|
|
map.insert("2".to_string(), None);
|
|
map.insert("3".to_string(), Some('b'));
|
|
map.insert("4".to_string(), None);
|
|
map.insert("5".to_string(), Some('c'));
|
|
|
|
let outer = Outer {
|
|
inner: vec!(
|
|
Inner {
|
|
a: (),
|
|
b: 5,
|
|
c: map,
|
|
},
|
|
)
|
|
};
|
|
|
|
let mut d = deserializer::OuterDeserializer::new(outer.clone());
|
|
let value: Result<Outer, Error> = Deserialize::deserialize(&mut d);
|
|
|
|
assert_eq!(value, Ok(outer));
|
|
})
|
|
}
|