forked from tafia/quick-xml
/
escape.rs
223 lines (196 loc) · 5.87 KB
/
escape.rs
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//! Serde `Deserializer` module
use crate::de::deserialize_bool;
use crate::encoding::Decoder;
use crate::errors::serialize::DeError;
use crate::escape::unescape;
use serde::de::{DeserializeSeed, EnumAccess, VariantAccess, Visitor};
use serde::{self, forward_to_deserialize_any, serde_if_integer128};
use std::borrow::Cow;
/// A deserializer for a xml escaped and encoded value
///
/// # Note
///
/// Escaping the value is actually not always necessary, for instance
/// when converting to float, we don't expect any escapable character
/// anyway
#[derive(Clone, Debug)]
pub struct EscapedDeserializer<'a> {
decoder: Decoder,
/// Possible escaped value of text/CDATA or attribute value
escaped_value: Cow<'a, [u8]>,
/// If `true`, value requires unescaping before using
escaped: bool,
}
impl<'a> EscapedDeserializer<'a> {
pub fn new(escaped_value: Cow<'a, [u8]>, decoder: Decoder, escaped: bool) -> Self {
EscapedDeserializer {
decoder,
escaped_value,
escaped,
}
}
}
macro_rules! deserialize_num {
($method:ident, $visit:ident) => {
fn $method<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
let value = self.decoder.decode(self.escaped_value.as_ref())?.parse()?;
visitor.$visit(value)
}
};
}
impl<'de, 'a> serde::Deserializer<'de> for EscapedDeserializer<'a> {
type Error = DeError;
fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
self.deserialize_str(visitor)
}
fn deserialize_str<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
let decoded = self.decoder.decode(&self.escaped_value)?;
if self.escaped {
match unescape(&decoded)? {
Cow::Borrowed(s) => visitor.visit_str(s),
Cow::Owned(s) => visitor.visit_string(s),
}
} else {
match decoded {
Cow::Borrowed(s) => visitor.visit_str(s),
Cow::Owned(s) => visitor.visit_string(s),
}
}
}
/// Returns [`DeError::Unsupported`]
fn deserialize_bytes<V>(self, _visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
Err(DeError::Unsupported(
"binary data content is not supported by XML format".into(),
))
}
/// Forwards deserialization to the [`deserialize_bytes`](#method.deserialize_bytes)
fn deserialize_byte_buf<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
self.deserialize_bytes(visitor)
}
fn deserialize_string<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
self.deserialize_str(visitor)
}
fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
deserialize_bool(self.escaped_value.as_ref(), self.decoder, visitor)
}
fn deserialize_char<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
self.deserialize_str(visitor)
}
fn deserialize_unit<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
visitor.visit_unit()
}
fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
if self.escaped_value.as_ref().is_empty() {
visitor.visit_none()
} else {
visitor.visit_some(self)
}
}
fn deserialize_enum<V>(
self,
_name: &str,
_variants: &'static [&'static str],
visitor: V,
) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
visitor.visit_enum(self)
}
fn deserialize_newtype_struct<V>(
self,
_name: &'static str,
visitor: V,
) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
visitor.visit_newtype_struct(self)
}
deserialize_num!(deserialize_i64, visit_i64);
deserialize_num!(deserialize_i32, visit_i32);
deserialize_num!(deserialize_i16, visit_i16);
deserialize_num!(deserialize_i8, visit_i8);
deserialize_num!(deserialize_u64, visit_u64);
deserialize_num!(deserialize_u32, visit_u32);
deserialize_num!(deserialize_u16, visit_u16);
deserialize_num!(deserialize_u8, visit_u8);
deserialize_num!(deserialize_f64, visit_f64);
deserialize_num!(deserialize_f32, visit_f32);
serde_if_integer128! {
deserialize_num!(deserialize_i128, visit_i128);
deserialize_num!(deserialize_u128, visit_u128);
}
forward_to_deserialize_any! {
unit_struct seq tuple tuple_struct map struct identifier ignored_any
}
}
impl<'de, 'a> EnumAccess<'de> for EscapedDeserializer<'a> {
type Error = DeError;
type Variant = Self;
fn variant_seed<V>(self, seed: V) -> Result<(V::Value, Self), Self::Error>
where
V: DeserializeSeed<'de>,
{
let name = seed.deserialize(self.clone())?;
Ok((name, self))
}
}
impl<'de, 'a> VariantAccess<'de> for EscapedDeserializer<'a> {
type Error = DeError;
fn unit_variant(self) -> Result<(), Self::Error> {
Ok(())
}
fn newtype_variant_seed<T>(self, seed: T) -> Result<T::Value, Self::Error>
where
T: DeserializeSeed<'de>,
{
seed.deserialize(self)
}
fn tuple_variant<V>(self, _len: usize, _visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
unimplemented!()
}
fn struct_variant<V>(
self,
_fields: &'static [&'static str],
_visitor: V,
) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
unimplemented!()
}
}