openethereum/json/src/uint.rs

112 lines
2.8 KiB
Rust

// Copyright 2015, 2016 Ethcore (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
//! Lenient uint json deserialization for test json files.
use std::str::FromStr;
use serde::{Deserialize, Deserializer, Error};
use serde::de::Visitor;
use util::{U256, Uint as U};
/// Lenient uint json deserialization for test json files.
#[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 {
// TODO: clean it after util conversions refactored.
u64::from(self.0) as usize
}
}
impl Into<u8> for Uint {
fn into(self) -> u8 {
u64::from(self.0) as u8
}
}
impl Deserialize for Uint {
fn deserialize<D>(deserializer: &mut D) -> Result<Self, D::Error>
where D: Deserializer {
deserializer.deserialize(UintVisitor)
}
}
struct UintVisitor;
impl Visitor for UintVisitor {
type Value = Uint;
fn visit_u64<E>(&mut self, value: u64) -> Result<Self::Value, E> where E: Error {
Ok(Uint(U256::from(value)))
}
fn visit_str<E>(&mut 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") => try!(U256::from_str(&value[2..]).map_err(|_| {
Error::custom(format!("Invalid hex value {}.", value).as_str())
})),
_ => try!(U256::from_dec_str(value).map_err(|_| {
Error::custom(format!("Invalid decimal value {}.", value).as_str())
}))
};
Ok(Uint(value))
}
fn visit_string<E>(&mut self, value: String) -> Result<Self::Value, E> where E: Error {
self.visit_str(value.as_ref())
}
}
#[cfg(test)]
mod test {
use serde_json;
use util::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());
}
}