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array_serde.rs
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291 lines (256 loc) · 7.77 KB
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// Copyright 2014-2016 bluss and ndarray developers.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use serde::de::{self, MapAccess, SeqAccess, Visitor};
use serde::ser::{SerializeSeq, SerializeStruct};
use serde::{Deserialize, Deserializer, Serialize, Serializer};
use alloc::format;
#[cfg(not(feature = "std"))]
use alloc::vec::Vec;
use std::fmt;
use std::marker::PhantomData;
use crate::imp_prelude::*;
use super::arraytraits::ARRAY_FORMAT_VERSION;
use super::Iter;
use crate::IntoDimension;
/// Verifies that the version of the deserialized array matches the current
/// `ARRAY_FORMAT_VERSION`.
pub fn verify_version<E>(v: u8) -> Result<(), E>
where E: de::Error
{
if v != ARRAY_FORMAT_VERSION {
let err_msg = format!("unknown array version: {}", v);
Err(de::Error::custom(err_msg))
} else {
Ok(())
}
}
/// **Requires crate feature `"serde"`**
impl<I> Serialize for Dim<I>
where I: Serialize
{
fn serialize<Se>(&self, serializer: Se) -> Result<Se::Ok, Se::Error>
where Se: Serializer
{
self.ix().serialize(serializer)
}
}
/// **Requires crate feature `"serde"`**
impl<'de, I> Deserialize<'de> for Dim<I>
where I: Deserialize<'de>
{
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where D: Deserializer<'de>
{
I::deserialize(deserializer).map(Dim::new)
}
}
/// **Requires crate feature `"serde"`**
impl Serialize for IxDyn
{
fn serialize<Se>(&self, serializer: Se) -> Result<Se::Ok, Se::Error>
where Se: Serializer
{
self.ix().serialize(serializer)
}
}
/// **Requires crate feature `"serde"`**
impl<'de> Deserialize<'de> for IxDyn
{
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where D: Deserializer<'de>
{
let v = Vec::<Ix>::deserialize(deserializer)?;
Ok(v.into_dimension())
}
}
/// **Requires crate feature `"serde"`**
impl<A, D, S> Serialize for ArrayBase<S, D>
where
A: Serialize,
D: Dimension + Serialize,
S: Data<Elem = A>,
{
fn serialize<Se>(&self, serializer: Se) -> Result<Se::Ok, Se::Error>
where Se: Serializer
{
let mut state = serializer.serialize_struct("Array", 3)?;
state.serialize_field("v", &ARRAY_FORMAT_VERSION)?;
state.serialize_field("dim", &self.raw_dim())?;
state.serialize_field("data", &Sequence(self.iter()))?;
state.end()
}
}
// private iterator wrapper
struct Sequence<'a, A, D>(Iter<'a, A, D>);
impl<A, D> Serialize for Sequence<'_, A, D>
where
A: Serialize,
D: Dimension + Serialize,
{
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where S: Serializer
{
let iter = &self.0;
let mut seq = serializer.serialize_seq(Some(iter.len()))?;
for elt in iter.clone() {
seq.serialize_element(elt)?;
}
seq.end()
}
}
struct ArrayVisitor<S, Di>
{
_marker_a: PhantomData<S>,
_marker_b: PhantomData<Di>,
}
enum ArrayField
{
Version,
Dim,
Data,
}
impl<S, Di> ArrayVisitor<S, Di>
{
pub fn new() -> Self
{
ArrayVisitor {
_marker_a: PhantomData,
_marker_b: PhantomData,
}
}
}
static ARRAY_FIELDS: &[&str] = &["v", "dim", "data"];
/// **Requires crate feature `"serde"`**
impl<'de, A, Di, S> Deserialize<'de> for ArrayBase<S, Di>
where
A: Deserialize<'de>,
Di: Deserialize<'de> + Dimension,
S: DataOwned<Elem = A>,
{
fn deserialize<D>(deserializer: D) -> Result<ArrayBase<S, Di>, D::Error>
where D: Deserializer<'de>
{
deserializer.deserialize_struct("Array", ARRAY_FIELDS, ArrayVisitor::new())
}
}
impl<'de> Deserialize<'de> for ArrayField
{
fn deserialize<D>(deserializer: D) -> Result<ArrayField, D::Error>
where D: Deserializer<'de>
{
struct ArrayFieldVisitor;
impl Visitor<'_> for ArrayFieldVisitor
{
type Value = ArrayField;
fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result
{
formatter.write_str(r#""v", "dim", or "data""#)
}
fn visit_str<E>(self, value: &str) -> Result<ArrayField, E>
where E: de::Error
{
match value {
"v" => Ok(ArrayField::Version),
"dim" => Ok(ArrayField::Dim),
"data" => Ok(ArrayField::Data),
other => Err(de::Error::unknown_field(other, ARRAY_FIELDS)),
}
}
fn visit_bytes<E>(self, value: &[u8]) -> Result<ArrayField, E>
where E: de::Error
{
match value {
b"v" => Ok(ArrayField::Version),
b"dim" => Ok(ArrayField::Dim),
b"data" => Ok(ArrayField::Data),
other => Err(de::Error::unknown_field(&format!("{:?}", other), ARRAY_FIELDS)),
}
}
}
deserializer.deserialize_identifier(ArrayFieldVisitor)
}
}
impl<'de, A, Di, S> Visitor<'de> for ArrayVisitor<S, Di>
where
A: Deserialize<'de>,
Di: Deserialize<'de> + Dimension,
S: DataOwned<Elem = A>,
{
type Value = ArrayBase<S, Di>;
fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result
{
formatter.write_str("ndarray representation")
}
fn visit_seq<V>(self, mut visitor: V) -> Result<ArrayBase<S, Di>, V::Error>
where V: SeqAccess<'de>
{
let v: u8 = match visitor.next_element()? {
Some(value) => value,
None => {
return Err(de::Error::invalid_length(0, &self));
}
};
verify_version(v)?;
let dim: Di = match visitor.next_element()? {
Some(value) => value,
None => {
return Err(de::Error::invalid_length(1, &self));
}
};
let data: Vec<A> = match visitor.next_element()? {
Some(value) => value,
None => {
return Err(de::Error::invalid_length(2, &self));
}
};
if let Ok(array) = ArrayBase::from_shape_vec(dim, data) {
Ok(array)
} else {
Err(de::Error::custom("data and dimension must match in size"))
}
}
fn visit_map<V>(self, mut visitor: V) -> Result<ArrayBase<S, Di>, V::Error>
where V: MapAccess<'de>
{
let mut v: Option<u8> = None;
let mut data: Option<Vec<A>> = None;
let mut dim: Option<Di> = None;
while let Some(key) = visitor.next_key()? {
match key {
ArrayField::Version => {
let val = visitor.next_value()?;
verify_version(val)?;
v = Some(val);
}
ArrayField::Data => {
data = Some(visitor.next_value()?);
}
ArrayField::Dim => {
dim = Some(visitor.next_value()?);
}
}
}
let _v = match v {
Some(v) => v,
None => return Err(de::Error::missing_field("v")),
};
let data = match data {
Some(data) => data,
None => return Err(de::Error::missing_field("data")),
};
let dim = match dim {
Some(dim) => dim,
None => return Err(de::Error::missing_field("dim")),
};
if let Ok(array) = ArrayBase::from_shape_vec(dim, data) {
Ok(array)
} else {
Err(de::Error::custom("data and dimension must match in size"))
}
}
}