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use std::io::Write;
use serde::ser::{self, Serialize};
use crate::error::{Error, Result};
use crate::ser::Serializer;
/// An implementation of `SerializeMap` for serializing to XML.
pub struct Map<'w, W>
where
W: Write,
{
parent: &'w mut Serializer<W>,
}
impl<'w, W> Map<'w, W>
where
W: 'w + Write,
{
pub fn new(parent: &'w mut Serializer<W>) -> Map<'w, W> {
Map { parent }
}
}
impl<'w, W> ser::SerializeMap for Map<'w, W>
where
W: 'w + Write,
{
type Ok = ();
type Error = Error;
fn serialize_key<T: ?Sized + Serialize>(&mut self, _: &T) -> Result<()> {
panic!("impossible to serialize the key on its own, please use serialize_entry()")
}
fn serialize_value<T: ?Sized + Serialize>(&mut self, value: &T) -> Result<()> {
value.serialize(&mut *self.parent)
}
fn end(self) -> Result<Self::Ok> {
Ok(())
}
fn serialize_entry<K: ?Sized + Serialize, V: ?Sized + Serialize>(
&mut self,
key: &K,
value: &V,
) -> Result<()> {
// TODO: Is it possible to ensure our key is never a composite type?
// Anything which isn't a "primitive" would lead to malformed XML here...
write!(self.parent.writer, "<")?;
key.serialize(&mut *self.parent)?;
write!(self.parent.writer, ">")?;
value.serialize(&mut *self.parent)?;
write!(self.parent.writer, "</")?;
key.serialize(&mut *self.parent)?;
write!(self.parent.writer, ">")?;
Ok(())
}
}
/// An implementation of `SerializeStruct` for serializing to XML.
pub struct Struct<'w, W>
where
W: Write,
{
parent: &'w mut Serializer<W>,
name: &'w str,
}
impl<'w, W> Struct<'w, W>
where
W: 'w + Write,
{
pub fn new(parent: &'w mut Serializer<W>, name: &'w str) -> Struct<'w, W> {
Struct { parent, name }
}
}
impl<'w, W> ser::SerializeStruct for Struct<'w, W>
where
W: 'w + Write,
{
type Ok = ();
type Error = Error;
fn serialize_field<T: ?Sized + Serialize>(
&mut self,
key: &'static str,
value: &T,
) -> Result<()> {
write!(self.parent.writer, "<{}>", key)?;
value.serialize(&mut *self.parent)?;
write!(self.parent.writer, "</{}>", key)?;
Ok(())
}
fn end(self) -> Result<Self::Ok> {
write!(self.parent.writer, "</{}>", self.name).map_err(|e| e.into())
}
}
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