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use crate::fixed_uint::UintConstructor;
use quote::quote;
impl UintConstructor {
pub fn with_serde(&self) {
self.with_serde_defun_pub();
}
fn with_serde_defun_pub(&self) {
let name = &self.ts.name;
let bytes_size = &self.ts.bytes_size;
let part = quote!(
#[cfg(feature = "support_serde")]
impl serde::Serialize for #name {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::Serializer,
{
fn hex_to(src: &[u8], dst: &mut [u8]) -> usize {
fn hex(byte: u8) -> u8 {
static TABLE: &[u8] = b"0123456789abcdef";
TABLE[byte as usize]
}
let mut len = src.len() * 2;
let mut idx = 0;
let first_nibble = src[0] >> 4;
if first_nibble != 0 {
dst[idx] = hex(src[0] >> 4);
idx += 1;
} else {
len -= 1;
}
dst[idx] = hex(src[0] & 0xf);
idx += 1;
for (byte, slots) in src.iter().skip(1).zip(dst[idx..].chunks_mut(2)) {
slots[0] = hex(*byte >> 4);
slots[1] = hex(*byte & 0xf);
}
len
}
let mut bytes = [0u8; #bytes_size];
let mut dst = [0u8; #bytes_size * 2 + 2];
dst[0] = b'0';
dst[1] = b'x';
self.into_big_endian(&mut bytes)
.map_err(|e| serde::ser::Error::custom(&format!("{}", e)))?;
let non_zero = bytes.iter().position(|&b| b != 0);
if let Some(non_zero_idx) = non_zero {
let bytes = &bytes[non_zero_idx..];
let len = hex_to(bytes, &mut dst[2..]);
serializer.serialize_str(unsafe {
::std::str::from_utf8_unchecked(&dst[..(len + 2)])
})
} else {
serializer.serialize_str("0x0")
}
}
}
#[cfg(feature = "support_serde")]
impl<'de> serde::Deserialize<'de> for #name {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: serde::Deserializer<'de>,
{
struct Visitor;
impl<'b> serde::de::Visitor<'b> for Visitor {
type Value = #name;
fn expecting(
&self,
formatter: &mut ::std::fmt::Formatter,
) -> ::std::fmt::Result {
write!(
formatter,
"a 0x-prefixed, no leading zeroes allowed hex string with at most {} digits",
#bytes_size * 2
)
}
fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
where
E: serde::de::Error,
{
if v.len() <= 2 || &v[0..2] != "0x" || (v.len() > 3 && &v[2..3] == "0")
{
return Err(E::custom(format_args!(
"invalid format, expected {}",
&self as &serde::de::Expected
)));
}
if v.len() > #bytes_size * 2 + 2 {
return Err(E::invalid_length(v.len() - 2, &self));
}
#name::from_hex_str(&v[2..]).map_err(|e| {
E::custom(format_args!(
"invalid hex bytes: {:?}, expected {}",
e, &self as &serde::de::Expected
))
})
}
fn visit_string<E>(self, v: String) -> Result<Self::Value, E>
where
E: serde::de::Error,
{
self.visit_str(&v)
}
}
deserializer.deserialize_str(Visitor)
}
}
);
self.implt(part);
}
}