#![allow(unused_variables)]
use serde::{ser, Serialize, Serializer};
use thiserror::*;
use std::fmt;
struct KVString {
output: String,
}
#[derive(Copy, Clone, PartialEq, Eq, Debug, Error)]
enum Error {
#[error("unsupported")]
Unsupported,
}
impl ser::Error for Error {
#[cold]
fn custom<T: fmt::Display>(msg: T) -> Error {
Error::Unsupported
}
}
pub fn to_string<T>(value: &T) -> Result<String, ()>
where
T: Serialize,
{
let mut serializer = KVString { output: String::new() };
value.serialize(&mut serializer).map_err(|_| ())?;
Ok(serializer.output)
}
impl Serializer for &mut KVString {
type Ok = ();
type Error = Error;
type SerializeSeq = ser::Impossible<(), Self::Error>;
type SerializeTuple = ser::Impossible<(), Self::Error>;
type SerializeTupleStruct = ser::Impossible<(), Self::Error>;
type SerializeTupleVariant = ser::Impossible<(), Self::Error>;
type SerializeMap = ser::Impossible<(), Self::Error>;
type SerializeStruct = Self;
type SerializeStructVariant = ser::Impossible<(), Self::Error>;
fn serialize_bool(self, v: bool) -> Result<Self::Ok, Self::Error> {
self.output += if v { "true" } else { "false" };
Ok(())
}
fn serialize_i8(self, v: i8) -> Result<(), Self::Error> {
self.serialize_i64(i64::from(v))
}
fn serialize_i16(self, v: i16) -> Result<(), Self::Error> {
self.serialize_i64(i64::from(v))
}
fn serialize_i32(self, v: i32) -> Result<(), Self::Error> {
self.serialize_i64(i64::from(v))
}
fn serialize_i64(self, v: i64) -> Result<(), Self::Error> {
self.output += &v.to_string();
Ok(())
}
fn serialize_u8(self, v: u8) -> Result<(), Self::Error> {
self.serialize_u64(u64::from(v))
}
fn serialize_u16(self, v: u16) -> Result<(), Self::Error> {
self.serialize_u64(u64::from(v))
}
fn serialize_u32(self, v: u32) -> Result<(), Self::Error> {
self.serialize_u64(u64::from(v))
}
fn serialize_u64(self, v: u64) -> Result<(), Self::Error> {
self.output += &v.to_string();
Ok(())
}
fn serialize_f32(self, v: f32) -> Result<(), Self::Error> {
self.serialize_f64(f64::from(v))
}
fn serialize_f64(self, v: f64) -> Result<(), Self::Error> {
self.output += &v.to_string();
Ok(())
}
fn serialize_char(self, v: char) -> Result<Self::Ok, Self::Error> {
unimplemented!()
}
fn serialize_str(self, v: &str) -> Result<Self::Ok, Self::Error> {
self.output += v;
Ok(())
}
fn serialize_bytes(self, v: &[u8]) -> Result<Self::Ok, Self::Error> {
unimplemented!()
}
fn serialize_none(self) -> Result<Self::Ok, Self::Error> {
self.output += "None";
Ok(())
}
fn serialize_some<T: ?Sized>(
self, value: &T,
) -> Result<Self::Ok, Self::Error>
where
T: Serialize,
{
value.serialize(self)
}
fn serialize_unit(self) -> Result<Self::Ok, Self::Error> {
self.output += "";
Ok(())
}
fn serialize_unit_struct(
self, name: &'static str,
) -> Result<Self::Ok, Self::Error> {
self.serialize_unit()
}
fn serialize_unit_variant(
self, name: &'static str, variant_index: u32, variant: &'static str,
) -> Result<Self::Ok, Self::Error> {
self.serialize_str(variant)
}
fn serialize_newtype_struct<T: ?Sized>(
self, name: &'static str, value: &T,
) -> Result<Self::Ok, Self::Error>
where
T: Serialize,
{
unimplemented!()
}
fn serialize_newtype_variant<T: ?Sized>(
self, name: &'static str, variant_index: u32, variant: &'static str,
value: &T,
) -> Result<Self::Ok, Self::Error>
where
T: Serialize,
{
unimplemented!()
}
fn serialize_seq(
self, len: Option<usize>,
) -> Result<Self::SerializeSeq, Self::Error> {
unimplemented!()
}
fn serialize_tuple(
self, len: usize,
) -> Result<Self::SerializeTuple, Self::Error> {
unimplemented!()
}
fn serialize_tuple_struct(
self, name: &'static str, len: usize,
) -> Result<Self::SerializeTupleStruct, Self::Error> {
unimplemented!()
}
fn serialize_tuple_variant(
self, name: &'static str, variant_index: u32, variant: &'static str,
len: usize,
) -> Result<Self::SerializeTupleVariant, Self::Error> {
unimplemented!()
}
fn serialize_map(
self, len: Option<usize>,
) -> Result<Self::SerializeMap, Self::Error> {
unimplemented!()
}
fn serialize_struct(
self, name: &'static str, len: usize,
) -> Result<Self::SerializeStruct, Self::Error> {
Ok(self)
}
fn serialize_struct_variant(
self, name: &'static str, variant_index: u32, variant: &'static str,
len: usize,
) -> Result<Self::SerializeStructVariant, Self::Error> {
unimplemented!()
}
}
impl<'a> ser::SerializeStruct for &mut KVString {
type Ok = ();
type Error = Error;
fn serialize_field<T>(
&mut self, key: &'static str, value: &T,
) -> Result<(), Self::Error>
where
T: ?Sized + Serialize,
{
if !self.output.is_empty() {
self.output += ", "
}
self.output += key;
self.output += " = ";
value.serialize(&mut **self)
}
fn end(self) -> Result<(), Self::Error> {
Ok(())
}
}
#[cfg(test)]
mod test {
use rav1e::prelude::SpeedSettings;
#[test]
fn serialize_speed_settings() {
for preset in 0..=10 {
let s = SpeedSettings::from_preset(preset);
let out = super::to_string(&s).unwrap();
println!("preset {}: {}", preset, out);
}
}
}