use super::{
map::{MapSerializer, StructSerializer},
seq::SequenceSerializer,
tuple::TupleSerializer,
writer::Writer,
};
use crate::error::{Error, Result};
use serde::Serialize;
use std::io::Write;
pub struct ChildSerializer<'a, W> {
writer: &'a mut Writer<W>,
element_name: Option<String>,
newtype_struct: bool,
}
impl<'a, W: 'a + Write> ChildSerializer<'a, W> {
pub fn new(writer: &'a mut Writer<W>, element_name: Option<String>) -> Self {
Self {
writer,
element_name,
newtype_struct: false,
}
}
pub fn for_newtype_struct(writer: &'a mut Writer<W>, element_name: String) -> Self {
Self {
writer,
element_name: Some(element_name),
newtype_struct: true,
}
}
fn maybe_start_element(&mut self) -> Result<bool> {
if let Some(element_name) = &self.element_name {
self.writer.start_element(element_name)?;
Ok(true)
} else {
Ok(false)
}
}
fn maybe_end_element(&mut self) -> Result<()> {
if self.element_name.is_some() {
self.writer.end_element()?;
}
Ok(())
}
}
impl<'a, W: Write> serde::ser::Serializer for ChildSerializer<'a, W> {
type Ok = ();
type Error = Error;
type SerializeSeq = SequenceSerializer<'a, W>;
type SerializeTuple = TupleSerializer<'a, W>;
type SerializeTupleStruct = TupleSerializer<'a, W>;
type SerializeTupleVariant = TupleSerializer<'a, W>;
type SerializeMap = MapSerializer<'a, W>;
type SerializeStruct = StructSerializer<'a, W>;
type SerializeStructVariant = StructSerializer<'a, W>;
fn serialize_bool(self, v: bool) -> Result<Self::Ok> {
self.serialize_str(&v.to_string())
}
fn serialize_i8(self, v: i8) -> Result<Self::Ok> {
self.serialize_str(&v.to_string())
}
fn serialize_i16(self, v: i16) -> Result<Self::Ok> {
self.serialize_str(&v.to_string())
}
fn serialize_i32(self, v: i32) -> Result<Self::Ok> {
self.serialize_str(&v.to_string())
}
fn serialize_i64(self, v: i64) -> Result<Self::Ok> {
self.serialize_str(&v.to_string())
}
fn serialize_u8(self, v: u8) -> Result<Self::Ok> {
self.serialize_str(&v.to_string())
}
fn serialize_u16(self, v: u16) -> Result<Self::Ok> {
self.serialize_str(&v.to_string())
}
fn serialize_u32(self, v: u32) -> Result<Self::Ok> {
self.serialize_str(&v.to_string())
}
fn serialize_u64(self, v: u64) -> Result<Self::Ok> {
self.serialize_str(&v.to_string())
}
fn serialize_f32(self, v: f32) -> Result<Self::Ok> {
self.serialize_str(&v.to_string())
}
fn serialize_f64(self, v: f64) -> Result<Self::Ok> {
self.serialize_str(&v.to_string())
}
fn serialize_char(self, v: char) -> Result<Self::Ok> {
self.serialize_str(&v.to_string())
}
fn serialize_str(mut self, v: &str) -> Result<Self::Ok> {
self.maybe_start_element()?;
self.writer.characters(v)?;
self.maybe_end_element()?;
Ok(())
}
fn serialize_bytes(mut self, v: &[u8]) -> Result<Self::Ok> {
self.maybe_start_element()?;
self.writer.characters(String::from_utf8(v.to_vec())?)?;
self.maybe_end_element()?;
Ok(())
}
fn serialize_none(self) -> Result<Self::Ok> {
if self.newtype_struct {
self.serialize_unit()
} else {
Ok(())
}
}
fn serialize_some<T>(self, value: &T) -> Result<Self::Ok>
where
T: ?Sized + Serialize,
{
value.serialize(self)
}
fn serialize_unit(mut self) -> Result<Self::Ok> {
self.maybe_start_element()?;
self.maybe_end_element()?;
Ok(())
}
fn serialize_unit_struct(self, _name: &'static str) -> Result<Self::Ok> {
self.serialize_unit()
}
fn serialize_unit_variant(
mut self,
_name: &'static str,
_variant_index: u32,
variant: &'static str,
) -> Result<Self::Ok> {
self.maybe_start_element()?;
self.writer.start_element(variant)?;
self.writer.end_element()?;
self.maybe_end_element()?;
Ok(())
}
fn serialize_newtype_struct<T>(mut self, _name: &'static str, value: &T) -> Result<Self::Ok>
where
T: ?Sized + Serialize,
{
self.newtype_struct = true;
value.serialize(self)?;
Ok(())
}
fn serialize_newtype_variant<T>(
mut self,
_name: &'static str,
_variant_index: u32,
variant: &'static str,
value: &T,
) -> Result<Self::Ok>
where
T: ?Sized + Serialize,
{
self.maybe_start_element()?;
value.serialize(ChildSerializer::new(self.writer, Some(variant.to_string())))?;
self.maybe_end_element()?;
Ok(())
}
fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq> {
if self.newtype_struct {
Ok(SequenceSerializer::new(self.writer, None))
} else {
Ok(SequenceSerializer::new(self.writer, self.element_name))
}
}
fn serialize_tuple(mut self, _len: usize) -> Result<Self::SerializeTuple> {
let should_end_element = self.maybe_start_element()?;
Ok(TupleSerializer::new(self.writer, should_end_element))
}
fn serialize_tuple_struct(
self,
_name: &'static str,
len: usize,
) -> Result<Self::SerializeTupleStruct> {
self.serialize_tuple(len)
}
fn serialize_tuple_variant(
mut self,
_name: &'static str,
_variant_index: u32,
variant: &'static str,
_len: usize,
) -> Result<Self::SerializeTupleVariant> {
let should_end_element = self.maybe_start_element()?;
self.writer.start_element(variant)?;
Ok(TupleSerializer::new(self.writer, should_end_element))
}
fn serialize_map(mut self, _len: Option<usize>) -> Result<Self::SerializeMap> {
let should_end_element = self.maybe_start_element()?;
Ok(MapSerializer::new(self.writer, should_end_element))
}
fn serialize_struct(self, name: &'static str, _len: usize) -> Result<Self::SerializeStruct> {
Ok(StructSerializer::new(
self.writer,
self.element_name.clone().unwrap_or(name.to_string()),
))
}
fn serialize_struct_variant(
self,
_name: &'static str,
_variant_index: u32,
variant: &'static str,
_len: usize,
) -> Result<Self::SerializeStructVariant> {
Ok(StructSerializer::new_variant(
self.writer,
self.element_name.clone(),
variant.to_string(),
))
}
}