916 lines
24 KiB
Rust
916 lines
24 KiB
Rust
//! Support code for encoding and decoding types.
|
|
|
|
/*
|
|
Core encoding and decoding interfaces.
|
|
*/
|
|
|
|
use std::borrow::Cow;
|
|
use std::cell::{Cell, RefCell};
|
|
use std::marker::PhantomData;
|
|
use std::path;
|
|
use std::rc::Rc;
|
|
use std::sync::Arc;
|
|
|
|
pub trait Encoder {
|
|
type Error;
|
|
|
|
// Primitive types:
|
|
fn emit_unit(&mut self) -> Result<(), Self::Error>;
|
|
fn emit_usize(&mut self, v: usize) -> Result<(), Self::Error>;
|
|
fn emit_u128(&mut self, v: u128) -> Result<(), Self::Error>;
|
|
fn emit_u64(&mut self, v: u64) -> Result<(), Self::Error>;
|
|
fn emit_u32(&mut self, v: u32) -> Result<(), Self::Error>;
|
|
fn emit_u16(&mut self, v: u16) -> Result<(), Self::Error>;
|
|
fn emit_u8(&mut self, v: u8) -> Result<(), Self::Error>;
|
|
fn emit_isize(&mut self, v: isize) -> Result<(), Self::Error>;
|
|
fn emit_i128(&mut self, v: i128) -> Result<(), Self::Error>;
|
|
fn emit_i64(&mut self, v: i64) -> Result<(), Self::Error>;
|
|
fn emit_i32(&mut self, v: i32) -> Result<(), Self::Error>;
|
|
fn emit_i16(&mut self, v: i16) -> Result<(), Self::Error>;
|
|
fn emit_i8(&mut self, v: i8) -> Result<(), Self::Error>;
|
|
fn emit_bool(&mut self, v: bool) -> Result<(), Self::Error>;
|
|
fn emit_f64(&mut self, v: f64) -> Result<(), Self::Error>;
|
|
fn emit_f32(&mut self, v: f32) -> Result<(), Self::Error>;
|
|
fn emit_char(&mut self, v: char) -> Result<(), Self::Error>;
|
|
fn emit_str(&mut self, v: &str) -> Result<(), Self::Error>;
|
|
|
|
// Compound types:
|
|
#[inline]
|
|
fn emit_enum<F>(&mut self, _name: &str, f: F) -> Result<(), Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<(), Self::Error>,
|
|
{
|
|
f(self)
|
|
}
|
|
|
|
fn emit_enum_variant<F>(
|
|
&mut self,
|
|
_v_name: &str,
|
|
v_id: usize,
|
|
_len: usize,
|
|
f: F,
|
|
) -> Result<(), Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<(), Self::Error>,
|
|
{
|
|
self.emit_usize(v_id)?;
|
|
f(self)
|
|
}
|
|
|
|
#[inline]
|
|
fn emit_enum_variant_arg<F>(&mut self, _a_idx: usize, f: F) -> Result<(), Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<(), Self::Error>,
|
|
{
|
|
f(self)
|
|
}
|
|
|
|
fn emit_enum_struct_variant<F>(
|
|
&mut self,
|
|
v_name: &str,
|
|
v_id: usize,
|
|
len: usize,
|
|
f: F,
|
|
) -> Result<(), Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<(), Self::Error>,
|
|
{
|
|
self.emit_enum_variant(v_name, v_id, len, f)
|
|
}
|
|
|
|
fn emit_enum_struct_variant_field<F>(
|
|
&mut self,
|
|
_f_name: &str,
|
|
f_idx: usize,
|
|
f: F,
|
|
) -> Result<(), Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<(), Self::Error>,
|
|
{
|
|
self.emit_enum_variant_arg(f_idx, f)
|
|
}
|
|
|
|
#[inline]
|
|
fn emit_struct<F>(&mut self, _name: &str, _len: usize, f: F) -> Result<(), Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<(), Self::Error>,
|
|
{
|
|
f(self)
|
|
}
|
|
|
|
#[inline]
|
|
fn emit_struct_field<F>(
|
|
&mut self,
|
|
_f_name: &str,
|
|
_f_idx: usize,
|
|
f: F,
|
|
) -> Result<(), Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<(), Self::Error>,
|
|
{
|
|
f(self)
|
|
}
|
|
|
|
#[inline]
|
|
fn emit_tuple<F>(&mut self, _len: usize, f: F) -> Result<(), Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<(), Self::Error>,
|
|
{
|
|
f(self)
|
|
}
|
|
|
|
#[inline]
|
|
fn emit_tuple_arg<F>(&mut self, _idx: usize, f: F) -> Result<(), Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<(), Self::Error>,
|
|
{
|
|
f(self)
|
|
}
|
|
|
|
fn emit_tuple_struct<F>(&mut self, _name: &str, len: usize, f: F) -> Result<(), Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<(), Self::Error>,
|
|
{
|
|
self.emit_tuple(len, f)
|
|
}
|
|
|
|
fn emit_tuple_struct_arg<F>(&mut self, f_idx: usize, f: F) -> Result<(), Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<(), Self::Error>,
|
|
{
|
|
self.emit_tuple_arg(f_idx, f)
|
|
}
|
|
|
|
// Specialized types:
|
|
fn emit_option<F>(&mut self, f: F) -> Result<(), Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<(), Self::Error>,
|
|
{
|
|
self.emit_enum("Option", f)
|
|
}
|
|
|
|
#[inline]
|
|
fn emit_option_none(&mut self) -> Result<(), Self::Error> {
|
|
self.emit_enum_variant("None", 0, 0, |_| Ok(()))
|
|
}
|
|
|
|
fn emit_option_some<F>(&mut self, f: F) -> Result<(), Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<(), Self::Error>,
|
|
{
|
|
self.emit_enum_variant("Some", 1, 1, f)
|
|
}
|
|
|
|
fn emit_seq<F>(&mut self, len: usize, f: F) -> Result<(), Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<(), Self::Error>,
|
|
{
|
|
self.emit_usize(len)?;
|
|
f(self)
|
|
}
|
|
|
|
#[inline]
|
|
fn emit_seq_elt<F>(&mut self, _idx: usize, f: F) -> Result<(), Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<(), Self::Error>,
|
|
{
|
|
f(self)
|
|
}
|
|
|
|
fn emit_map<F>(&mut self, len: usize, f: F) -> Result<(), Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<(), Self::Error>,
|
|
{
|
|
self.emit_usize(len)?;
|
|
f(self)
|
|
}
|
|
|
|
#[inline]
|
|
fn emit_map_elt_key<F>(&mut self, _idx: usize, f: F) -> Result<(), Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<(), Self::Error>,
|
|
{
|
|
f(self)
|
|
}
|
|
|
|
#[inline]
|
|
fn emit_map_elt_val<F>(&mut self, _idx: usize, f: F) -> Result<(), Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<(), Self::Error>,
|
|
{
|
|
f(self)
|
|
}
|
|
}
|
|
|
|
pub trait Decoder {
|
|
type Error;
|
|
|
|
// Primitive types:
|
|
fn read_nil(&mut self) -> Result<(), Self::Error>;
|
|
fn read_usize(&mut self) -> Result<usize, Self::Error>;
|
|
fn read_u128(&mut self) -> Result<u128, Self::Error>;
|
|
fn read_u64(&mut self) -> Result<u64, Self::Error>;
|
|
fn read_u32(&mut self) -> Result<u32, Self::Error>;
|
|
fn read_u16(&mut self) -> Result<u16, Self::Error>;
|
|
fn read_u8(&mut self) -> Result<u8, Self::Error>;
|
|
fn read_isize(&mut self) -> Result<isize, Self::Error>;
|
|
fn read_i128(&mut self) -> Result<i128, Self::Error>;
|
|
fn read_i64(&mut self) -> Result<i64, Self::Error>;
|
|
fn read_i32(&mut self) -> Result<i32, Self::Error>;
|
|
fn read_i16(&mut self) -> Result<i16, Self::Error>;
|
|
fn read_i8(&mut self) -> Result<i8, Self::Error>;
|
|
fn read_bool(&mut self) -> Result<bool, Self::Error>;
|
|
fn read_f64(&mut self) -> Result<f64, Self::Error>;
|
|
fn read_f32(&mut self) -> Result<f32, Self::Error>;
|
|
fn read_char(&mut self) -> Result<char, Self::Error>;
|
|
fn read_str(&mut self) -> Result<Cow<'_, str>, Self::Error>;
|
|
|
|
// Compound types:
|
|
#[inline]
|
|
fn read_enum<T, F>(&mut self, _name: &str, f: F) -> Result<T, Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<T, Self::Error>,
|
|
{
|
|
f(self)
|
|
}
|
|
|
|
#[inline]
|
|
fn read_enum_variant<T, F>(&mut self, _names: &[&str], mut f: F) -> Result<T, Self::Error>
|
|
where
|
|
F: FnMut(&mut Self, usize) -> Result<T, Self::Error>,
|
|
{
|
|
let disr = self.read_usize()?;
|
|
f(self, disr)
|
|
}
|
|
|
|
#[inline]
|
|
fn read_enum_variant_arg<T, F>(&mut self, _a_idx: usize, f: F) -> Result<T, Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<T, Self::Error>,
|
|
{
|
|
f(self)
|
|
}
|
|
|
|
fn read_enum_struct_variant<T, F>(&mut self, names: &[&str], f: F) -> Result<T, Self::Error>
|
|
where
|
|
F: FnMut(&mut Self, usize) -> Result<T, Self::Error>,
|
|
{
|
|
self.read_enum_variant(names, f)
|
|
}
|
|
|
|
fn read_enum_struct_variant_field<T, F>(
|
|
&mut self,
|
|
_f_name: &str,
|
|
f_idx: usize,
|
|
f: F,
|
|
) -> Result<T, Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<T, Self::Error>,
|
|
{
|
|
self.read_enum_variant_arg(f_idx, f)
|
|
}
|
|
|
|
#[inline]
|
|
fn read_struct<T, F>(&mut self, _s_name: &str, _len: usize, f: F) -> Result<T, Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<T, Self::Error>,
|
|
{
|
|
f(self)
|
|
}
|
|
|
|
#[inline]
|
|
fn read_struct_field<T, F>(
|
|
&mut self,
|
|
_f_name: &str,
|
|
_f_idx: usize,
|
|
f: F,
|
|
) -> Result<T, Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<T, Self::Error>,
|
|
{
|
|
f(self)
|
|
}
|
|
|
|
#[inline]
|
|
fn read_tuple<T, F>(&mut self, _len: usize, f: F) -> Result<T, Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<T, Self::Error>,
|
|
{
|
|
f(self)
|
|
}
|
|
|
|
#[inline]
|
|
fn read_tuple_arg<T, F>(&mut self, _a_idx: usize, f: F) -> Result<T, Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<T, Self::Error>,
|
|
{
|
|
f(self)
|
|
}
|
|
|
|
fn read_tuple_struct<T, F>(&mut self, _s_name: &str, len: usize, f: F) -> Result<T, Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<T, Self::Error>,
|
|
{
|
|
self.read_tuple(len, f)
|
|
}
|
|
|
|
fn read_tuple_struct_arg<T, F>(&mut self, a_idx: usize, f: F) -> Result<T, Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<T, Self::Error>,
|
|
{
|
|
self.read_tuple_arg(a_idx, f)
|
|
}
|
|
|
|
// Specialized types:
|
|
fn read_option<T, F>(&mut self, mut f: F) -> Result<T, Self::Error>
|
|
where
|
|
F: FnMut(&mut Self, bool) -> Result<T, Self::Error>,
|
|
{
|
|
self.read_enum("Option", move |this| {
|
|
this.read_enum_variant(&["None", "Some"], move |this, idx| match idx {
|
|
0 => f(this, false),
|
|
1 => f(this, true),
|
|
_ => Err(this.error("read_option: expected 0 for None or 1 for Some")),
|
|
})
|
|
})
|
|
}
|
|
|
|
fn read_seq<T, F>(&mut self, f: F) -> Result<T, Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self, usize) -> Result<T, Self::Error>,
|
|
{
|
|
let len = self.read_usize()?;
|
|
f(self, len)
|
|
}
|
|
|
|
#[inline]
|
|
fn read_seq_elt<T, F>(&mut self, _idx: usize, f: F) -> Result<T, Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<T, Self::Error>,
|
|
{
|
|
f(self)
|
|
}
|
|
|
|
fn read_map<T, F>(&mut self, f: F) -> Result<T, Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self, usize) -> Result<T, Self::Error>,
|
|
{
|
|
let len = self.read_usize()?;
|
|
f(self, len)
|
|
}
|
|
|
|
#[inline]
|
|
fn read_map_elt_key<T, F>(&mut self, _idx: usize, f: F) -> Result<T, Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<T, Self::Error>,
|
|
{
|
|
f(self)
|
|
}
|
|
|
|
#[inline]
|
|
fn read_map_elt_val<T, F>(&mut self, _idx: usize, f: F) -> Result<T, Self::Error>
|
|
where
|
|
F: FnOnce(&mut Self) -> Result<T, Self::Error>,
|
|
{
|
|
f(self)
|
|
}
|
|
|
|
// Failure
|
|
fn error(&mut self, err: &str) -> Self::Error;
|
|
}
|
|
|
|
pub trait Encodable<S: Encoder> {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error>;
|
|
}
|
|
|
|
pub trait Decodable<D: Decoder>: Sized {
|
|
fn decode(d: &mut D) -> Result<Self, D::Error>;
|
|
}
|
|
|
|
impl<S: Encoder> Encodable<S> for usize {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_usize(*self)
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder> Decodable<D> for usize {
|
|
fn decode(d: &mut D) -> Result<usize, D::Error> {
|
|
d.read_usize()
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder> Encodable<S> for u8 {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_u8(*self)
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder> Decodable<D> for u8 {
|
|
fn decode(d: &mut D) -> Result<u8, D::Error> {
|
|
d.read_u8()
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder> Encodable<S> for u16 {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_u16(*self)
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder> Decodable<D> for u16 {
|
|
fn decode(d: &mut D) -> Result<u16, D::Error> {
|
|
d.read_u16()
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder> Encodable<S> for u32 {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_u32(*self)
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder> Decodable<D> for u32 {
|
|
fn decode(d: &mut D) -> Result<u32, D::Error> {
|
|
d.read_u32()
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder> Encodable<S> for ::std::num::NonZeroU32 {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_u32(self.get())
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder> Decodable<D> for ::std::num::NonZeroU32 {
|
|
fn decode(d: &mut D) -> Result<Self, D::Error> {
|
|
d.read_u32().map(|d| ::std::num::NonZeroU32::new(d).unwrap())
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder> Encodable<S> for u64 {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_u64(*self)
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder> Decodable<D> for u64 {
|
|
fn decode(d: &mut D) -> Result<u64, D::Error> {
|
|
d.read_u64()
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder> Encodable<S> for u128 {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_u128(*self)
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder> Decodable<D> for u128 {
|
|
fn decode(d: &mut D) -> Result<u128, D::Error> {
|
|
d.read_u128()
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder> Encodable<S> for isize {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_isize(*self)
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder> Decodable<D> for isize {
|
|
fn decode(d: &mut D) -> Result<isize, D::Error> {
|
|
d.read_isize()
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder> Encodable<S> for i8 {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_i8(*self)
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder> Decodable<D> for i8 {
|
|
fn decode(d: &mut D) -> Result<i8, D::Error> {
|
|
d.read_i8()
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder> Encodable<S> for i16 {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_i16(*self)
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder> Decodable<D> for i16 {
|
|
fn decode(d: &mut D) -> Result<i16, D::Error> {
|
|
d.read_i16()
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder> Encodable<S> for i32 {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_i32(*self)
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder> Decodable<D> for i32 {
|
|
fn decode(d: &mut D) -> Result<i32, D::Error> {
|
|
d.read_i32()
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder> Encodable<S> for i64 {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_i64(*self)
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder> Decodable<D> for i64 {
|
|
fn decode(d: &mut D) -> Result<i64, D::Error> {
|
|
d.read_i64()
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder> Encodable<S> for i128 {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_i128(*self)
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder> Decodable<D> for i128 {
|
|
fn decode(d: &mut D) -> Result<i128, D::Error> {
|
|
d.read_i128()
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder> Encodable<S> for str {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_str(self)
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder> Encodable<S> for &str {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_str(self)
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder> Encodable<S> for String {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_str(&self[..])
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder> Decodable<D> for String {
|
|
fn decode(d: &mut D) -> Result<String, D::Error> {
|
|
Ok(d.read_str()?.into_owned())
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder> Encodable<S> for f32 {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_f32(*self)
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder> Decodable<D> for f32 {
|
|
fn decode(d: &mut D) -> Result<f32, D::Error> {
|
|
d.read_f32()
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder> Encodable<S> for f64 {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_f64(*self)
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder> Decodable<D> for f64 {
|
|
fn decode(d: &mut D) -> Result<f64, D::Error> {
|
|
d.read_f64()
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder> Encodable<S> for bool {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_bool(*self)
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder> Decodable<D> for bool {
|
|
fn decode(d: &mut D) -> Result<bool, D::Error> {
|
|
d.read_bool()
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder> Encodable<S> for char {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_char(*self)
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder> Decodable<D> for char {
|
|
fn decode(d: &mut D) -> Result<char, D::Error> {
|
|
d.read_char()
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder> Encodable<S> for () {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_unit()
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder> Decodable<D> for () {
|
|
fn decode(d: &mut D) -> Result<(), D::Error> {
|
|
d.read_nil()
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder, T> Encodable<S> for PhantomData<T> {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_unit()
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder, T> Decodable<D> for PhantomData<T> {
|
|
fn decode(d: &mut D) -> Result<PhantomData<T>, D::Error> {
|
|
d.read_nil()?;
|
|
Ok(PhantomData)
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder, T: Decodable<D>> Decodable<D> for Box<[T]> {
|
|
fn decode(d: &mut D) -> Result<Box<[T]>, D::Error> {
|
|
let v: Vec<T> = Decodable::decode(d)?;
|
|
Ok(v.into_boxed_slice())
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder, T: Encodable<S>> Encodable<S> for Rc<T> {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
(**self).encode(s)
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder, T: Decodable<D>> Decodable<D> for Rc<T> {
|
|
fn decode(d: &mut D) -> Result<Rc<T>, D::Error> {
|
|
Ok(Rc::new(Decodable::decode(d)?))
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder, T: Encodable<S>> Encodable<S> for [T] {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_seq(self.len(), |s| {
|
|
for (i, e) in self.iter().enumerate() {
|
|
s.emit_seq_elt(i, |s| e.encode(s))?
|
|
}
|
|
Ok(())
|
|
})
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder, T: Encodable<S>> Encodable<S> for Vec<T> {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_seq(self.len(), |s| {
|
|
for (i, e) in self.iter().enumerate() {
|
|
s.emit_seq_elt(i, |s| e.encode(s))?
|
|
}
|
|
Ok(())
|
|
})
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder, T: Decodable<D>> Decodable<D> for Vec<T> {
|
|
fn decode(d: &mut D) -> Result<Vec<T>, D::Error> {
|
|
d.read_seq(|d, len| {
|
|
let mut v = Vec::with_capacity(len);
|
|
for i in 0..len {
|
|
v.push(d.read_seq_elt(i, |d| Decodable::decode(d))?);
|
|
}
|
|
Ok(v)
|
|
})
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder> Encodable<S> for [u8; 20] {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_seq(self.len(), |s| {
|
|
for (i, e) in self.iter().enumerate() {
|
|
s.emit_seq_elt(i, |s| e.encode(s))?
|
|
}
|
|
Ok(())
|
|
})
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder> Decodable<D> for [u8; 20] {
|
|
fn decode(d: &mut D) -> Result<[u8; 20], D::Error> {
|
|
d.read_seq(|d, len| {
|
|
assert!(len == 20);
|
|
let mut v = [0u8; 20];
|
|
for i in 0..len {
|
|
v[i] = d.read_seq_elt(i, |d| Decodable::decode(d))?;
|
|
}
|
|
Ok(v)
|
|
})
|
|
}
|
|
}
|
|
|
|
impl<'a, S: Encoder, T: Encodable<S>> Encodable<S> for Cow<'a, [T]>
|
|
where
|
|
[T]: ToOwned<Owned = Vec<T>>,
|
|
{
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_seq(self.len(), |s| {
|
|
for (i, e) in self.iter().enumerate() {
|
|
s.emit_seq_elt(i, |s| e.encode(s))?
|
|
}
|
|
Ok(())
|
|
})
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder, T: Decodable<D> + ToOwned> Decodable<D> for Cow<'static, [T]>
|
|
where
|
|
[T]: ToOwned<Owned = Vec<T>>,
|
|
{
|
|
fn decode(d: &mut D) -> Result<Cow<'static, [T]>, D::Error> {
|
|
d.read_seq(|d, len| {
|
|
let mut v = Vec::with_capacity(len);
|
|
for i in 0..len {
|
|
v.push(d.read_seq_elt(i, |d| Decodable::decode(d))?);
|
|
}
|
|
Ok(Cow::Owned(v))
|
|
})
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder, T: Encodable<S>> Encodable<S> for Option<T> {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_option(|s| match *self {
|
|
None => s.emit_option_none(),
|
|
Some(ref v) => s.emit_option_some(|s| v.encode(s)),
|
|
})
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder, T: Decodable<D>> Decodable<D> for Option<T> {
|
|
fn decode(d: &mut D) -> Result<Option<T>, D::Error> {
|
|
d.read_option(|d, b| if b { Ok(Some(Decodable::decode(d)?)) } else { Ok(None) })
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder, T1: Encodable<S>, T2: Encodable<S>> Encodable<S> for Result<T1, T2> {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
s.emit_enum("Result", |s| match *self {
|
|
Ok(ref v) => {
|
|
s.emit_enum_variant("Ok", 0, 1, |s| s.emit_enum_variant_arg(0, |s| v.encode(s)))
|
|
}
|
|
Err(ref v) => {
|
|
s.emit_enum_variant("Err", 1, 1, |s| s.emit_enum_variant_arg(0, |s| v.encode(s)))
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder, T1: Decodable<D>, T2: Decodable<D>> Decodable<D> for Result<T1, T2> {
|
|
fn decode(d: &mut D) -> Result<Result<T1, T2>, D::Error> {
|
|
d.read_enum("Result", |d| {
|
|
d.read_enum_variant(&["Ok", "Err"], |d, disr| match disr {
|
|
0 => Ok(Ok(d.read_enum_variant_arg(0, |d| T1::decode(d))?)),
|
|
1 => Ok(Err(d.read_enum_variant_arg(0, |d| T2::decode(d))?)),
|
|
_ => {
|
|
panic!(
|
|
"Encountered invalid discriminant while \
|
|
decoding `Result`."
|
|
);
|
|
}
|
|
})
|
|
})
|
|
}
|
|
}
|
|
|
|
macro_rules! peel {
|
|
($name:ident, $($other:ident,)*) => (tuple! { $($other,)* })
|
|
}
|
|
|
|
/// Evaluates to the number of tokens passed to it.
|
|
///
|
|
/// Logarithmic counting: every one or two recursive expansions, the number of
|
|
/// tokens to count is divided by two, instead of being reduced by one.
|
|
/// Therefore, the recursion depth is the binary logarithm of the number of
|
|
/// tokens to count, and the expanded tree is likewise very small.
|
|
macro_rules! count {
|
|
() => (0usize);
|
|
($one:tt) => (1usize);
|
|
($($pairs:tt $_p:tt)*) => (count!($($pairs)*) << 1usize);
|
|
($odd:tt $($rest:tt)*) => (count!($($rest)*) | 1usize);
|
|
}
|
|
|
|
macro_rules! tuple {
|
|
() => ();
|
|
( $($name:ident,)+ ) => (
|
|
impl<D: Decoder, $($name: Decodable<D>),+> Decodable<D> for ($($name,)+) {
|
|
#[allow(non_snake_case)]
|
|
fn decode(d: &mut D) -> Result<($($name,)+), D::Error> {
|
|
let len: usize = count!($($name)+);
|
|
d.read_tuple(len, |d| {
|
|
let mut i = 0;
|
|
let ret = ($(d.read_tuple_arg({ i+=1; i-1 }, |d| -> Result<$name, D::Error> {
|
|
Decodable::decode(d)
|
|
})?,)+);
|
|
Ok(ret)
|
|
})
|
|
}
|
|
}
|
|
impl<S: Encoder, $($name: Encodable<S>),+> Encodable<S> for ($($name,)+) {
|
|
#[allow(non_snake_case)]
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
let ($(ref $name,)+) = *self;
|
|
let mut n = 0;
|
|
$(let $name = $name; n += 1;)+
|
|
s.emit_tuple(n, |s| {
|
|
let mut i = 0;
|
|
$(s.emit_tuple_arg({ i+=1; i-1 }, |s| $name.encode(s))?;)+
|
|
Ok(())
|
|
})
|
|
}
|
|
}
|
|
peel! { $($name,)+ }
|
|
)
|
|
}
|
|
|
|
tuple! { T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, }
|
|
|
|
impl<S: Encoder> Encodable<S> for path::Path {
|
|
fn encode(&self, e: &mut S) -> Result<(), S::Error> {
|
|
self.to_str().unwrap().encode(e)
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder> Encodable<S> for path::PathBuf {
|
|
fn encode(&self, e: &mut S) -> Result<(), S::Error> {
|
|
path::Path::encode(self, e)
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder> Decodable<D> for path::PathBuf {
|
|
fn decode(d: &mut D) -> Result<path::PathBuf, D::Error> {
|
|
let bytes: String = Decodable::decode(d)?;
|
|
Ok(path::PathBuf::from(bytes))
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder, T: Encodable<S> + Copy> Encodable<S> for Cell<T> {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
self.get().encode(s)
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder, T: Decodable<D> + Copy> Decodable<D> for Cell<T> {
|
|
fn decode(d: &mut D) -> Result<Cell<T>, D::Error> {
|
|
Ok(Cell::new(Decodable::decode(d)?))
|
|
}
|
|
}
|
|
|
|
// FIXME: #15036
|
|
// Should use `try_borrow`, returning a
|
|
// `encoder.error("attempting to Encode borrowed RefCell")`
|
|
// from `encode` when `try_borrow` returns `None`.
|
|
|
|
impl<S: Encoder, T: Encodable<S>> Encodable<S> for RefCell<T> {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
self.borrow().encode(s)
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder, T: Decodable<D>> Decodable<D> for RefCell<T> {
|
|
fn decode(d: &mut D) -> Result<RefCell<T>, D::Error> {
|
|
Ok(RefCell::new(Decodable::decode(d)?))
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder, T: Encodable<S>> Encodable<S> for Arc<T> {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
(**self).encode(s)
|
|
}
|
|
}
|
|
|
|
impl<D: Decoder, T: Decodable<D>> Decodable<D> for Arc<T> {
|
|
fn decode(d: &mut D) -> Result<Arc<T>, D::Error> {
|
|
Ok(Arc::new(Decodable::decode(d)?))
|
|
}
|
|
}
|
|
|
|
impl<S: Encoder, T: ?Sized + Encodable<S>> Encodable<S> for Box<T> {
|
|
fn encode(&self, s: &mut S) -> Result<(), S::Error> {
|
|
(**self).encode(s)
|
|
}
|
|
}
|
|
impl<D: Decoder, T: Decodable<D>> Decodable<D> for Box<T> {
|
|
fn decode(d: &mut D) -> Result<Box<T>, D::Error> {
|
|
Ok(box Decodable::decode(d)?)
|
|
}
|
|
}
|