463 lines
14 KiB
Rust
463 lines
14 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::fmt::Debug;
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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(PartialEq, Debug)]
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pub enum Error {
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EndOfStream,
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SyntaxError,
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MissingField,
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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 missing_field_error(_: &'static str) -> Error {
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Error::MissingField
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}
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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 std::collections::hash_map::IntoIter;
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use rustc_serialize;
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use super::Error;
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use self::Value::{StringValue, IsizeValue};
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enum Value {
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StringValue(String),
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IsizeValue(isize),
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}
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pub struct IsizeDecoder {
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len: usize,
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iter: IntoIter<String, isize>,
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stack: Vec<Value>,
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}
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impl IsizeDecoder {
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#[inline]
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pub fn new(values: HashMap<String, isize>) -> IsizeDecoder {
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IsizeDecoder {
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len: values.len(),
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iter: values.into_iter(),
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stack: vec!(),
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}
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}
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}
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impl rustc_serialize::Decoder for IsizeDecoder {
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type Error = Error;
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fn error(&mut self, _msg: &str) -> Error {
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Error::SyntaxError
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}
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// Primitive types:
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fn read_nil(&mut self) -> Result<(), Error> { Err(Error::SyntaxError) }
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fn read_usize(&mut self) -> Result<usize, Error> { Err(Error::SyntaxError) }
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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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#[inline]
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fn read_isize(&mut self) -> Result<isize, Error> {
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match self.stack.pop() {
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Some(IsizeValue(x)) => Ok(x),
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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 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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fn read_char(&mut self) -> Result<char, Error> { Err(Error::SyntaxError) }
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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(StringValue(x)) => Ok(x),
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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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// 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 IsizeDecoder) -> 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 IsizeDecoder, 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 IsizeDecoder) -> 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 IsizeDecoder, 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 IsizeDecoder) -> Result<T, Error>,
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{
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Err(Error::SyntaxError)
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}
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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 IsizeDecoder) -> Result<T, Error>,
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{
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Err(Error::SyntaxError)
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}
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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 IsizeDecoder) -> 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<T, F>(&mut self, _len: usize, _f: F) -> Result<T, Error> where
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F: FnOnce(&mut IsizeDecoder) -> 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 IsizeDecoder) -> 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 IsizeDecoder) -> 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 IsizeDecoder) -> 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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fn read_option<T, F>(&mut self, _f: F) -> Result<T, Error> where
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F: FnOnce(&mut IsizeDecoder, bool) -> Result<T, Error>,
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{
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Err(Error::SyntaxError)
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}
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fn read_seq<T, F>(&mut self, _f: F) -> Result<T, Error> where
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F: FnOnce(&mut IsizeDecoder, 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_seq_elt<T, F>(&mut self, _idx: usize, _f: F) -> Result<T, Error> where
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F: FnOnce(&mut IsizeDecoder) -> 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_map<T, F>(&mut self, f: F) -> Result<T, Error> where
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F: FnOnce(&mut IsizeDecoder, usize) -> Result<T, Error>,
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{
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let len = self.len;
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f(self, len)
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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 IsizeDecoder) -> Result<T, Error>,
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{
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match self.iter.next() {
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Some((key, value)) => {
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self.stack.push(IsizeValue(value));
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self.stack.push(StringValue(key));
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f(self)
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}
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None => {
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Err(Error::SyntaxError)
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}
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}
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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 IsizeDecoder) -> 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 super::Error;
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use serde::de;
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#[derive(PartialEq, Debug)]
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enum State {
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StartState,
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KeyState(String),
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ValueState(isize),
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}
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pub struct IsizeDeserializer {
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stack: Vec<State>,
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iter: hash_map::IntoIter<String, isize>,
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}
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impl IsizeDeserializer {
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#[inline]
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pub fn new(values: HashMap<String, isize>) -> IsizeDeserializer {
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IsizeDeserializer {
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stack: vec!(State::StartState),
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iter: values.into_iter(),
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}
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}
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}
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impl de::Deserializer for IsizeDeserializer {
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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::StartState) => {
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visitor.visit_map(self)
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}
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Some(State::KeyState(key)) => {
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visitor.visit_string(key)
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}
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Some(State::ValueState(value)) => {
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visitor.visit_isize(value)
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}
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None => {
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Err(Error::EndOfStream)
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}
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}
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}
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}
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impl de::MapVisitor for IsizeDeserializer {
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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.iter.next() {
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Some((key, value)) => {
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self.stack.push(State::ValueState(value));
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self.stack.push(State::KeyState(key));
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Ok(Some(try!(de::Deserialize::deserialize(self))))
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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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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)
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}
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fn end(&mut self) -> Result<(), Error> {
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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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fn size_hint(&self) -> (usize, Option<usize>) {
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self.iter.size_hint()
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}
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}
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/*
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impl Iterator for IsizeDeserializer {
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type Item = Result<de::Token, Error>;
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#[inline]
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fn next(&mut self) -> Option<Result<de::Token, Error>> {
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match self.stack.pop() {
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Some(StartState) => {
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self.stack.push(KeyOrEndState);
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Some(Ok(de::Token::MapStart(self.len)))
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}
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Some(KeyOrEndState) => {
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match self.iter.next() {
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Some((key, value)) => {
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self.stack.push(ValueState(value));
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Some(Ok(de::Token::String(key)))
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}
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None => {
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self.stack.push(EndState);
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Some(Ok(de::Token::End))
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}
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}
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}
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Some(ValueState(x)) => {
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self.stack.push(KeyOrEndState);
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Some(Ok(de::Token::Isize(x)))
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}
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Some(EndState) => {
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None
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}
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None => {
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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 de::Deserializer<Error> for IsizeDeserializer {
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#[inline]
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fn end_of_stream_error(&mut self) -> Error {
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EndOfStream
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}
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#[inline]
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fn syntax_error(&mut self, _token: de::Token, _expected: &[de::TokenKind]) -> Error {
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SyntaxError
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}
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#[inline]
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fn unexpected_name_error(&mut self, _token: de::Token) -> Error {
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SyntaxError
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}
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#[inline]
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fn conversion_error(&mut self, _token: de::Token) -> Error {
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SyntaxError
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}
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#[inline]
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fn missing_field<
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T: de::Deserialize<IsizeDeserializer, Error>
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>(&mut self, _field: &'static str) -> Result<T, Error> {
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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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//////////////////////////////////////////////////////////////////////////////
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fn run_decoder<
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D: Decoder<Error=Error>,
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T: Clone + PartialEq + Debug + Decodable
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>(mut d: D, value: T) {
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let v = Decodable::decode(&mut d);
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assert_eq!(Ok(value), v);
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}
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#[bench]
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fn bench_decoder_000(b: &mut Bencher) {
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b.iter(|| {
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let m: HashMap<String, isize> = HashMap::new();
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run_decoder(decoder::IsizeDecoder::new(m.clone()), m)
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})
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}
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#[bench]
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fn bench_decoder_003(b: &mut Bencher) {
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b.iter(|| {
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let mut m: HashMap<String, isize> = HashMap::new();
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for i in (0 .. 3) {
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m.insert(i.to_string(), i);
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}
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run_decoder(decoder::IsizeDecoder::new(m.clone()), m)
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})
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}
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#[bench]
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fn bench_decoder_100(b: &mut Bencher) {
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b.iter(|| {
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let mut m: HashMap<String, isize> = HashMap::new();
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for i in (0 .. 100) {
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m.insert(i.to_string(), i);
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}
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run_decoder(decoder::IsizeDecoder::new(m.clone()), m)
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})
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}
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fn run_deserializer<
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D: Deserializer<Error=E>,
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E: Debug,
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T: Clone + PartialEq + Debug + Deserialize
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>(mut d: D, value: T) {
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let v: T = Deserialize::deserialize(&mut d).unwrap();
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assert_eq!(value, v);
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}
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#[bench]
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fn bench_deserializer_000(b: &mut Bencher) {
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b.iter(|| {
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let m: HashMap<String, isize> = HashMap::new();
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run_deserializer(deserializer::IsizeDeserializer::new(m.clone()), m)
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})
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}
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#[bench]
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fn bench_deserializer_003(b: &mut Bencher) {
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b.iter(|| {
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let mut m: HashMap<String, isize> = HashMap::new();
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for i in (0 .. 3) {
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m.insert(i.to_string(), i);
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}
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run_deserializer(deserializer::IsizeDeserializer::new(m.clone()), m)
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})
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}
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#[bench]
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fn bench_deserializer_100(b: &mut Bencher) {
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b.iter(|| {
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let mut m: HashMap<String, isize> = HashMap::new();
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for i in (0 .. 100) {
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m.insert(i.to_string(), i);
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}
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run_deserializer(deserializer::IsizeDeserializer::new(m.clone()), m)
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})
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}
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