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// Copyright 2017 rust-ipfs-api Developers
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://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::{Deserialize, Deserializer, MapAccess, SeqAccess, Visitor};
use std::collections::HashMap;
use std::error::Error;
use std::fmt;
use std::marker::PhantomData;
pub struct IntegerVisitor;
impl<'de> Visitor<'de> for IntegerVisitor {
type Value = i64;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("integer")
}
fn visit_i8<E>(self, num: i8) -> Result<Self::Value, E>
where
E: Error,
{
Ok(num.into())
}
fn visit_i32<E>(self, num: i32) -> Result<Self::Value, E>
where
E: Error,
{
Ok(num.into())
}
fn visit_i64<E>(self, num: i64) -> Result<Self::Value, E>
where
E: Error,
{
Ok(num)
}
fn visit_u8<E>(self, num: u8) -> Result<Self::Value, E>
where
E: Error,
{
Ok(num.into())
}
fn visit_u32<E>(self, num: u32) -> Result<Self::Value, E>
where
E: Error,
{
Ok(num.into())
}
fn visit_u64<E>(self, num: u64) -> Result<Self::Value, E>
where
E: Error,
{
Ok(num as i64)
}
}
/// Deserializes a sequence or null values as a vec.
///
pub fn deserialize_vec<'de, T, D>(deserializer: D) -> Result<Vec<T>, D::Error>
where
D: Deserializer<'de>,
T: Deserialize<'de>,
{
// Visits a sequence or null type, returning either the sequence
// or an empty vector.
//
struct VecVisitor<T>(PhantomData<T>);
impl<'de, T> Visitor<'de> for VecVisitor<T>
where
T: Deserialize<'de>,
{
type Value = Vec<T>;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("sequence or unit")
}
fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
where
A: SeqAccess<'de>,
{
let mut vec = Vec::new();
while let Some(item) = seq.next_element()? {
vec.push(item);
}
Ok(vec)
}
fn visit_none<E>(self) -> Result<Self::Value, E>
where
E: Error,
{
Ok(Default::default())
}
fn visit_some<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
where
D: Deserializer<'de>,
{
deserializer.deserialize_seq(VecVisitor(PhantomData))
}
}
deserializer.deserialize_option(VecVisitor(PhantomData))
}
/// Deserializes a map or null values as a HashMap.
///
pub fn deserialize_hashmap<'de, T, D>(deserializer: D) -> Result<HashMap<String, T>, D::Error>
where
D: Deserializer<'de>,
T: Deserialize<'de>,
{
// Visits a map or null type, returning either the mapping
// or an empty HashMap.
//
struct MapVisitor<T>(PhantomData<T>);
impl<'de, T> Visitor<'de> for MapVisitor<T>
where
T: Deserialize<'de>,
{
type Value = HashMap<String, T>;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("map or unit")
}
fn visit_map<A>(self, mut map: A) -> Result<Self::Value, A::Error>
where
A: MapAccess<'de>,
{
let mut hashmap = HashMap::new();
while let Some((key, value)) = map.next_entry()? {
hashmap.insert(key, value);
}
Ok(hashmap)
}
fn visit_none<E>(self) -> Result<Self::Value, E>
where
E: Error,
{
Ok(Default::default())
}
fn visit_some<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
where
D: Deserializer<'de>,
{
deserializer.deserialize_map(MapVisitor(PhantomData))
}
}
deserializer.deserialize_option(MapVisitor(PhantomData))
}
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