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Allow using IgnoredAny as a visitor

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This commit is contained in:
David Tolnay 2017-04-13 16:53:27 -07:00
parent dfea7ec939
commit dd092dce95
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GPG Key ID: F9BA143B95FF6D82
1 changed files with 99 additions and 95 deletions
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194
serde/src/de/ignored_any.rs
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@ -7,106 +7,110 @@ use de::{Deserialize, Deserializer, Visitor, SeqVisitor, MapVisitor, Error};
#[derive(Copy, Clone, Debug, Default)]
pub struct IgnoredAny;
impl<'de> Visitor<'de> for IgnoredAny {
type Value = IgnoredAny;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("anything at all")
}
#[inline]
fn visit_bool<E>(self, x: bool) -> Result<Self::Value, E> {
let _ = x;
Ok(IgnoredAny)
}
#[inline]
fn visit_i64<E>(self, x: i64) -> Result<Self::Value, E> {
let _ = x;
Ok(IgnoredAny)
}
#[inline]
fn visit_u64<E>(self, x: u64) -> Result<Self::Value, E> {
let _ = x;
Ok(IgnoredAny)
}
#[inline]
fn visit_f64<E>(self, x: f64) -> Result<Self::Value, E> {
let _ = x;
Ok(IgnoredAny)
}
#[inline]
fn visit_str<E>(self, s: &str) -> Result<Self::Value, E>
where
E: Error,
{
let _ = s;
Ok(IgnoredAny)
}
#[inline]
fn visit_none<E>(self) -> Result<Self::Value, E> {
Ok(IgnoredAny)
}
#[inline]
fn visit_some<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
where
D: Deserializer<'de>,
{
IgnoredAny::deserialize(deserializer)
}
#[inline]
fn visit_newtype_struct<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
where
D: Deserializer<'de>,
{
IgnoredAny::deserialize(deserializer)
}
#[inline]
fn visit_unit<E>(self) -> Result<Self::Value, E> {
Ok(IgnoredAny)
}
#[inline]
fn visit_seq<V>(self, mut visitor: V) -> Result<Self::Value, V::Error>
where
V: SeqVisitor<'de>,
{
while let Some(IgnoredAny) = try!(visitor.visit()) {
// Gobble
}
Ok(IgnoredAny)
}
#[inline]
fn visit_map<V>(self, mut visitor: V) -> Result<Self::Value, V::Error>
where
V: MapVisitor<'de>,
{
while let Some((IgnoredAny, IgnoredAny)) = try!(visitor.visit()) {
// Gobble
}
Ok(IgnoredAny)
}
#[inline]
fn visit_bytes<E>(self, bytes: &[u8]) -> Result<Self::Value, E>
where
E: Error,
{
let _ = bytes;
Ok(IgnoredAny)
}
}
impl<'de> Deserialize<'de> for IgnoredAny {
#[inline]
fn deserialize<D>(deserializer: D) -> Result<IgnoredAny, D::Error>
where
D: Deserializer<'de>,
{
struct IgnoredAnyVisitor;
impl<'de> Visitor<'de> for IgnoredAnyVisitor {
type Value = IgnoredAny;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("anything at all")
}
#[inline]
fn visit_bool<E>(self, _: bool) -> Result<IgnoredAny, E> {
Ok(IgnoredAny)
}
#[inline]
fn visit_i64<E>(self, _: i64) -> Result<IgnoredAny, E> {
Ok(IgnoredAny)
}
#[inline]
fn visit_u64<E>(self, _: u64) -> Result<IgnoredAny, E> {
Ok(IgnoredAny)
}
#[inline]
fn visit_f64<E>(self, _: f64) -> Result<IgnoredAny, E> {
Ok(IgnoredAny)
}
#[inline]
fn visit_str<E>(self, _: &str) -> Result<IgnoredAny, E>
where
E: Error,
{
Ok(IgnoredAny)
}
#[inline]
fn visit_none<E>(self) -> Result<IgnoredAny, E> {
Ok(IgnoredAny)
}
#[inline]
fn visit_some<D>(self, deserializer: D) -> Result<IgnoredAny, D::Error>
where
D: Deserializer<'de>,
{
IgnoredAny::deserialize(deserializer)
}
#[inline]
fn visit_newtype_struct<D>(self, deserializer: D) -> Result<IgnoredAny, D::Error>
where
D: Deserializer<'de>,
{
IgnoredAny::deserialize(deserializer)
}
#[inline]
fn visit_unit<E>(self) -> Result<IgnoredAny, E> {
Ok(IgnoredAny)
}
#[inline]
fn visit_seq<V>(self, mut visitor: V) -> Result<IgnoredAny, V::Error>
where
V: SeqVisitor<'de>,
{
while let Some(_) = try!(visitor.visit::<IgnoredAny>()) {
// Gobble
}
Ok(IgnoredAny)
}
#[inline]
fn visit_map<V>(self, mut visitor: V) -> Result<IgnoredAny, V::Error>
where
V: MapVisitor<'de>,
{
while let Some((_, _)) = try!(visitor.visit::<IgnoredAny, IgnoredAny>()) {
// Gobble
}
Ok(IgnoredAny)
}
#[inline]
fn visit_bytes<E>(self, _: &[u8]) -> Result<IgnoredAny, E>
where
E: Error,
{
Ok(IgnoredAny)
}
}
deserializer.deserialize_ignored_any(IgnoredAnyVisitor)
deserializer.deserialize_ignored_any(IgnoredAny)
}
}