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use std::fmt;
use std::str::FromStr;
use serde::{Deserialize, Deserializer, Serialize, Serializer};
use serde::de::{Error, Visitor, Unexpected};
use ethereum_types::U256;
#[derive(Default, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Copy)]
pub struct Uint(pub U256);
impl Into<U256> for Uint {
fn into(self) -> U256 {
self.0
}
}
impl Into<u64> for Uint {
fn into(self) -> u64 {
u64::from(self.0)
}
}
impl Into<usize> for Uint {
fn into(self) -> usize {
u64::from(self.0) as usize
}
}
impl Into<u8> for Uint {
fn into(self) -> u8 {
u64::from(self.0) as u8
}
}
impl Serialize for Uint {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where S: Serializer {
self.0.to_string().serialize(serializer)
}
}
impl<'a> Deserialize<'a> for Uint {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where D: Deserializer<'a> {
deserializer.deserialize_any(UintVisitor)
}
}
struct UintVisitor;
impl<'a> Visitor<'a> for UintVisitor {
type Value = Uint;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
write!(formatter, "a hex encoded or decimal uint")
}
fn visit_u64<E>(self, value: u64) -> Result<Self::Value, E> where E: Error {
Ok(Uint(U256::from(value)))
}
fn visit_str<E>(self, value: &str) -> Result<Self::Value, E> where E: Error {
let value = match value.len() {
0 => U256::from(0),
2 if value.starts_with("0x") => U256::from(0),
_ if value.starts_with("0x") => U256::from_str(&value[2..]).map_err(|e| {
Error::custom(format!("Invalid hex value {}: {}", value, e).as_str())
})?,
_ => U256::from_dec_str(value).map_err(|e| {
Error::custom(format!("Invalid decimal value {}: {:?}", value, e).as_str())
})?
};
Ok(Uint(value))
}
fn visit_string<E>(self, value: String) -> Result<Self::Value, E> where E: Error {
self.visit_str(value.as_ref())
}
}
pub fn validate_non_zero<'de, D>(d: D) -> Result<Uint, D::Error> where D: Deserializer<'de> {
let value = Uint::deserialize(d)?;
if value == Uint(U256::from(0)) {
return Err(Error::invalid_value(Unexpected::Unsigned(value.into()), &"a non-zero value"))
}
Ok(value)
}
pub fn validate_optional_non_zero<'de, D>(d: D) -> Result<Option<Uint>, D::Error> where D: Deserializer<'de> {
let value: Option<Uint> = Option::deserialize(d)?;
if let Some(value) = value {
if value == Uint(U256::from(0)) {
return Err(Error::invalid_value(Unexpected::Unsigned(value.into()), &"a non-zero value"))
}
}
Ok(value)
}
#[cfg(test)]
mod test {
use serde_json;
use ethereum_types::U256;
use uint::Uint;
#[test]
fn uint_deserialization() {
let s = r#"["0xa", "10", "", "0x", 0]"#;
let deserialized: Vec<Uint> = serde_json::from_str(s).unwrap();
assert_eq!(deserialized, vec![
Uint(U256::from(10)),
Uint(U256::from(10)),
Uint(U256::from(0)),
Uint(U256::from(0)),
Uint(U256::from(0))
]);
}
#[test]
fn uint_into() {
assert_eq!(U256::from(10), Uint(U256::from(10)).into());
}
}