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use super::super::ser::key::KeySink; use super::super::ser::part::PartSerializer; use super::super::ser::value::ValueSink; use super::super::ser::Error; use serde::ser; use std::borrow::Cow; use std::mem; use url::form_urlencoded::Serializer as UrlEncodedSerializer; use url::form_urlencoded::Target as UrlEncodedTarget; pub struct PairSerializer<'target, Target: 'target + UrlEncodedTarget> { urlencoder: &'target mut UrlEncodedSerializer<Target>, state: PairState, } impl<'target, Target> PairSerializer<'target, Target> where Target: 'target + UrlEncodedTarget, { pub fn new(urlencoder: &'target mut UrlEncodedSerializer<Target>) -> Self { PairSerializer { urlencoder, state: PairState::WaitingForKey, } } } impl<'target, Target> ser::Serializer for PairSerializer<'target, Target> where Target: 'target + UrlEncodedTarget, { type Ok = (); type Error = Error; type SerializeSeq = ser::Impossible<(), Error>; type SerializeTuple = Self; type SerializeTupleStruct = ser::Impossible<(), Error>; type SerializeTupleVariant = ser::Impossible<(), Error>; type SerializeMap = ser::Impossible<(), Error>; type SerializeStruct = ser::Impossible<(), Error>; type SerializeStructVariant = ser::Impossible<(), Error>; fn serialize_bool(self, _v: bool) -> Result<(), Error> { Err(Error::unsupported_pair()) } fn serialize_i8(self, _v: i8) -> Result<(), Error> { Err(Error::unsupported_pair()) } fn serialize_i16(self, _v: i16) -> Result<(), Error> { Err(Error::unsupported_pair()) } fn serialize_i32(self, _v: i32) -> Result<(), Error> { Err(Error::unsupported_pair()) } fn serialize_i64(self, _v: i64) -> Result<(), Error> { Err(Error::unsupported_pair()) } fn serialize_u8(self, _v: u8) -> Result<(), Error> { Err(Error::unsupported_pair()) } fn serialize_u16(self, _v: u16) -> Result<(), Error> { Err(Error::unsupported_pair()) } fn serialize_u32(self, _v: u32) -> Result<(), Error> { Err(Error::unsupported_pair()) } fn serialize_u64(self, _v: u64) -> Result<(), Error> { Err(Error::unsupported_pair()) } fn serialize_f32(self, _v: f32) -> Result<(), Error> { Err(Error::unsupported_pair()) } fn serialize_f64(self, _v: f64) -> Result<(), Error> { Err(Error::unsupported_pair()) } fn serialize_char(self, _v: char) -> Result<(), Error> { Err(Error::unsupported_pair()) } fn serialize_str(self, _value: &str) -> Result<(), Error> { Err(Error::unsupported_pair()) } fn serialize_bytes(self, _value: &[u8]) -> Result<(), Error> { Err(Error::unsupported_pair()) } fn serialize_unit(self) -> Result<(), Error> { Err(Error::unsupported_pair()) } fn serialize_unit_struct(self, _name: &'static str) -> Result<(), Error> { Err(Error::unsupported_pair()) } fn serialize_unit_variant( self, _name: &'static str, _variant_index: u32, _variant: &'static str, ) -> Result<(), Error> { Err(Error::unsupported_pair()) } fn serialize_newtype_struct<T: ?Sized + ser::Serialize>( self, _name: &'static str, value: &T, ) -> Result<(), Error> { value.serialize(self) } fn serialize_newtype_variant<T: ?Sized + ser::Serialize>( self, _name: &'static str, _variant_index: u32, _variant: &'static str, _value: &T, ) -> Result<(), Error> { Err(Error::unsupported_pair()) } fn serialize_none(self) -> Result<(), Error> { Ok(()) } fn serialize_some<T: ?Sized + ser::Serialize>(self, value: &T) -> Result<(), Error> { value.serialize(self) } fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq, Error> { Err(Error::unsupported_pair()) } fn serialize_tuple(self, len: usize) -> Result<Self, Error> { if len == 2 { Ok(self) } else { Err(Error::unsupported_pair()) } } fn serialize_tuple_struct( self, _name: &'static str, _len: usize, ) -> Result<Self::SerializeTupleStruct, Error> { Err(Error::unsupported_pair()) } fn serialize_tuple_variant( self, _name: &'static str, _variant_index: u32, _variant: &'static str, _len: usize, ) -> Result<Self::SerializeTupleVariant, Error> { Err(Error::unsupported_pair()) } fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap, Error> { Err(Error::unsupported_pair()) } fn serialize_struct( self, _name: &'static str, _len: usize, ) -> Result<Self::SerializeStruct, Error> { Err(Error::unsupported_pair()) } fn serialize_struct_variant( self, _name: &'static str, _variant_index: u32, _variant: &'static str, _len: usize, ) -> Result<Self::SerializeStructVariant, Error> { Err(Error::unsupported_pair()) } } impl<'target, Target> ser::SerializeTuple for PairSerializer<'target, Target> where Target: 'target + UrlEncodedTarget, { type Ok = (); type Error = Error; fn serialize_element<T: ?Sized + ser::Serialize>( &mut self, value: &T, ) -> Result<(), Error> { match mem::replace(&mut self.state, PairState::Done) { PairState::WaitingForKey => { let key_sink = KeySink::new(|key| Ok(key.into())); let key_serializer = PartSerializer::new(key_sink); self.state = PairState::WaitingForValue { key: value.serialize(key_serializer)?, }; Ok(()) } PairState::WaitingForValue { key } => { let result = { let value_sink = ValueSink::new(self.urlencoder, &key); let value_serializer = PartSerializer::new(value_sink); value.serialize(value_serializer) }; if result.is_ok() { self.state = PairState::Done; } else { self.state = PairState::WaitingForValue { key }; } result } PairState::Done => Err(Error::done()), } } fn end(self) -> Result<(), Error> { if let PairState::Done = self.state { Ok(()) } else { Err(Error::not_done()) } } } enum PairState { WaitingForKey, WaitingForValue { key: Cow<'static, str> }, Done, } impl Error { fn done() -> Self { Error::Custom("this pair has already been serialized".into()) } fn not_done() -> Self { Error::Custom("this pair has not yet been serialized".into()) } fn unsupported_pair() -> Self { Error::Custom("unsupported pair".into()) } }