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// This file is part of ICU4X. For terms of use, please see the file
// called LICENSE at the top level of the ICU4X source tree
// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
use crate::TinyAsciiStr;
use alloc::borrow::Cow;
use alloc::string::ToString;
use core::fmt;
use core::marker::PhantomData;
use core::ops::Deref;
use serde::de::{Error, SeqAccess, Visitor};
use serde::ser::SerializeTuple;
use serde::{Deserialize, Deserializer, Serialize, Serializer};
impl<const N: usize> Serialize for TinyAsciiStr<N> {
#[inline]
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
if serializer.is_human_readable() {
self.deref().serialize(serializer)
} else {
let mut seq = serializer.serialize_tuple(N)?;
for byte in self.all_bytes() {
seq.serialize_element(byte)?;
}
seq.end()
}
}
}
struct TinyAsciiStrVisitor<const N: usize> {
marker: PhantomData<TinyAsciiStr<N>>,
}
impl<const N: usize> TinyAsciiStrVisitor<N> {
fn new() -> Self {
TinyAsciiStrVisitor {
marker: PhantomData,
}
}
}
impl<'de, const N: usize> Visitor<'de> for TinyAsciiStrVisitor<N> {
type Value = TinyAsciiStr<N>;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
write!(formatter, "a TinyAsciiStr<{N}>")
}
#[inline]
fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
where
A: SeqAccess<'de>,
{
let mut bytes = [0u8; N];
let mut zeroes = false;
for out in &mut bytes.iter_mut().take(N) {
let byte = seq
.next_element()?
.ok_or_else(|| Error::invalid_length(N, &self))?;
if byte == 0 {
zeroes = true;
} else if zeroes {
return Err(Error::custom("TinyAsciiStr cannot contain null bytes"));
}
if byte >= 0x80 {
return Err(Error::custom("TinyAsciiStr cannot contain non-ascii bytes"));
}
*out = byte;
}
Ok(unsafe { TinyAsciiStr::from_bytes_unchecked(bytes) })
}
}
impl<'de, const N: usize> Deserialize<'de> for TinyAsciiStr<N> {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
if deserializer.is_human_readable() {
let x: Cow<'de, str> = Deserialize::deserialize(deserializer)?;
TinyAsciiStr::from_str(&x).map_err(|e| Error::custom(e.to_string()))
} else {
deserializer.deserialize_tuple(N, TinyAsciiStrVisitor::<N>::new())
}
}
}
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