/
var.rs
305 lines (270 loc) · 7.86 KB
/
var.rs
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use crate::{
errors::{serialize::DeError, Error},
events::{BytesEnd, BytesStart, Event},
se::Serializer,
writer::Writer,
};
use de::{INNER_VALUE, UNFLATTEN_PREFIX};
use serde::ser::{self, Serialize, SerializeMap};
use serde::Serializer as _;
use std::io::Write;
/// An implementation of `SerializeMap` for serializing to XML.
pub struct Map<'r, 'w, W>
where
W: 'w + Write,
{
parent: &'w mut Serializer<'r, W>,
}
impl<'r, 'w, W> Map<'r, 'w, W>
where
W: 'w + Write,
{
/// Create a new Map
pub fn new(parent: &'w mut Serializer<'r, W>) -> Self {
Map { parent }
}
}
impl<'r, 'w, W> ser::SerializeMap for Map<'r, 'w, W>
where
W: 'w + Write,
{
type Ok = ();
type Error = DeError;
fn serialize_key<T: ?Sized + Serialize>(&mut self, _: &T) -> Result<(), DeError> {
Err(DeError::Unsupported(
"impossible to serialize the key on its own, please use serialize_entry()",
))
}
fn serialize_value<T: ?Sized + Serialize>(&mut self, value: &T) -> Result<(), DeError> {
value.serialize(&mut *self.parent)
}
fn end(self) -> Result<Self::Ok, DeError> {
if let Some(tag) = self.parent.root_tag {
self.parent
.writer
.write_event(Event::End(BytesEnd::borrowed(tag.as_bytes())))?;
}
Ok(())
}
fn serialize_entry<K: ?Sized + Serialize, V: ?Sized + Serialize>(
&mut self,
key: &K,
value: &V,
) -> Result<(), DeError> {
// 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.inner(), "<").map_err(Error::Io)?;
key.serialize(&mut *self.parent)?;
write!(self.parent.writer.inner(), ">").map_err(Error::Io)?;
value.serialize(&mut *self.parent)?;
write!(self.parent.writer.inner(), "</").map_err(Error::Io)?;
key.serialize(&mut *self.parent)?;
write!(self.parent.writer.inner(), ">").map_err(Error::Io)?;
Ok(())
}
}
/// An implementation of `SerializeStruct` for serializing to XML.
pub struct Struct<'r, 'w, W>
where
W: 'w + Write,
{
parent: &'w mut Serializer<'r, W>,
/// Buffer for holding fields, serialized as attributes. Doesn't allocate
/// if there are no fields represented as attributes
attrs: BytesStart<'w>,
/// Buffer for holding fields, serialized as elements
children: Vec<u8>,
/// Buffer for serializing one field. Cleared after serialize each field
buffer: Vec<u8>,
}
impl<'r, 'w, W> Struct<'r, 'w, W>
where
W: 'w + Write,
{
/// Create a new `Struct`
pub fn new(parent: &'w mut Serializer<'r, W>, name: &'r str) -> Self {
let name = name.as_bytes();
Struct {
parent,
attrs: BytesStart::borrowed_name(name),
children: Vec::new(),
buffer: Vec::new(),
}
}
}
impl<'r, 'w, W> ser::SerializeStruct for Struct<'r, 'w, W>
where
W: 'w + Write,
{
type Ok = ();
type Error = DeError;
fn serialize_field<T: ?Sized + Serialize>(
&mut self,
key: &'static str,
value: &T,
) -> Result<(), DeError> {
// TODO: Inherit indentation state from self.parent.writer
let writer = Writer::new(&mut self.buffer);
if key.starts_with(UNFLATTEN_PREFIX) {
let key = key.split_at(UNFLATTEN_PREFIX.len()).1;
let mut serializer = Serializer::with_root(writer, Some(key));
serializer.serialize_newtype_struct(key, value);
self.children.append(&mut self.buffer);
} else {
let mut serializer = Serializer::with_root(writer, Some(key));
value.serialize(&mut serializer)?;
if !self.buffer.is_empty() {
if self.buffer[0] == b'<' || key == INNER_VALUE {
// Drains buffer, moves it to children
self.children.append(&mut self.buffer);
} else {
self.attrs
.push_attribute((key.as_bytes(), self.buffer.as_ref()));
self.buffer.clear();
}
}
}
Ok(())
}
fn end(self) -> Result<Self::Ok, DeError> {
if self.children.is_empty() {
self.parent.writer.write_event(Event::Empty(self.attrs))?;
} else {
self.parent
.writer
.write_event(Event::Start(self.attrs.to_borrowed()))?;
self.parent.writer.write(&self.children)?;
self.parent
.writer
.write_event(Event::End(self.attrs.to_end()))?;
}
Ok(())
}
}
impl<'r, 'w, W> ser::SerializeStructVariant for Struct<'r, 'w, W>
where
W: 'w + Write,
{
type Ok = ();
type Error = DeError;
#[inline]
fn serialize_field<T: ?Sized + Serialize>(
&mut self,
key: &'static str,
value: &T,
) -> Result<(), Self::Error> {
<Self as ser::SerializeStruct>::serialize_field(self, key, value)
}
#[inline]
fn end(self) -> Result<Self::Ok, Self::Error> {
<Self as ser::SerializeStruct>::end(self)
}
}
/// An implementation of `SerializeSeq' for serializing to XML.
pub struct Seq<'r, 'w, W>
where
W: 'w + Write,
{
parent: &'w mut Serializer<'r, W>,
}
impl<'r, 'w, W> Seq<'r, 'w, W>
where
W: 'w + Write,
{
/// Create a new `Seq`
pub fn new(parent: &'w mut Serializer<'r, W>) -> Self {
Seq { parent }
}
}
impl<'r, 'w, W> ser::SerializeSeq for Seq<'r, 'w, W>
where
W: 'w + Write,
{
type Ok = ();
type Error = DeError;
fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
where
T: Serialize,
{
value.serialize(&mut *self.parent)?;
Ok(())
}
fn end(self) -> Result<Self::Ok, Self::Error> {
Ok(())
}
}
/// An implementation of `SerializeTuple`, `SerializeTupleStruct` and
/// `SerializeTupleVariant` for serializing to XML.
pub struct Tuple<'r, 'w, W>
where
W: 'w + Write,
{
parent: &'w mut Serializer<'r, W>,
/// Possible qualified name of XML tag surrounding each element
name: &'r str,
}
impl<'r, 'w, W> Tuple<'r, 'w, W>
where
W: 'w + Write,
{
/// Create a new `Tuple`
pub fn new(parent: &'w mut Serializer<'r, W>, name: &'r str) -> Self {
Tuple { parent, name }
}
}
impl<'r, 'w, W> ser::SerializeTuple for Tuple<'r, 'w, W>
where
W: 'w + Write,
{
type Ok = ();
type Error = DeError;
fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
where
T: Serialize,
{
write!(self.parent.writer.inner(), "<{}>", self.name).map_err(Error::Io)?;
value.serialize(&mut *self.parent)?;
write!(self.parent.writer.inner(), "</{}>", self.name).map_err(Error::Io)?;
Ok(())
}
#[inline]
fn end(self) -> Result<Self::Ok, Self::Error> {
Ok(())
}
}
impl<'r, 'w, W> ser::SerializeTupleStruct for Tuple<'r, 'w, W>
where
W: 'w + Write,
{
type Ok = ();
type Error = DeError;
#[inline]
fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
where
T: Serialize,
{
<Self as ser::SerializeTuple>::serialize_element(self, value)
}
#[inline]
fn end(self) -> Result<Self::Ok, Self::Error> {
<Self as ser::SerializeTuple>::end(self)
}
}
impl<'r, 'w, W> ser::SerializeTupleVariant for Tuple<'r, 'w, W>
where
W: 'w + Write,
{
type Ok = ();
type Error = DeError;
#[inline]
fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
where
T: Serialize,
{
<Self as ser::SerializeTuple>::serialize_element(self, value)
}
#[inline]
fn end(self) -> Result<Self::Ok, Self::Error> {
<Self as ser::SerializeTuple>::end(self)
}
}