117 lines
2.9 KiB
Rust
117 lines
2.9 KiB
Rust
// Copyright 2015-2017 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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//! Lenient uint json deserialization for test json files.
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use std::fmt;
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use std::str::FromStr;
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use serde::{Deserialize, Deserializer};
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use serde::de::{Error, Visitor};
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use util::{U256, Uint as U};
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/// Lenient uint json deserialization for test json files.
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#[derive(Default, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Copy)]
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pub struct Uint(pub U256);
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impl Into<U256> for Uint {
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fn into(self) -> U256 {
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self.0
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}
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}
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impl Into<u64> for Uint {
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fn into(self) -> u64 {
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u64::from(self.0)
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}
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}
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impl Into<usize> for Uint {
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fn into(self) -> usize {
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// TODO: clean it after util conversions refactored.
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u64::from(self.0) as usize
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}
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}
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impl Into<u8> for Uint {
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fn into(self) -> u8 {
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u64::from(self.0) as u8
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}
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}
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impl Deserialize for Uint {
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fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
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where D: Deserializer {
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deserializer.deserialize(UintVisitor)
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}
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}
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struct UintVisitor;
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impl Visitor for UintVisitor {
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type Value = Uint;
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fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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write!(formatter, "a hex encoded uint")
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}
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fn visit_u64<E>(self, value: u64) -> Result<Self::Value, E> where E: Error {
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Ok(Uint(U256::from(value)))
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}
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fn visit_str<E>(self, value: &str) -> Result<Self::Value, E> where E: Error {
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let value = match value.len() {
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0 => U256::from(0),
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2 if value.starts_with("0x") => U256::from(0),
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_ if value.starts_with("0x") => U256::from_str(&value[2..]).map_err(|_| {
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Error::custom(format!("Invalid hex value {}.", value).as_str())
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})?,
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_ => U256::from_dec_str(value).map_err(|_| {
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Error::custom(format!("Invalid decimal value {}.", value).as_str())
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})?
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};
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Ok(Uint(value))
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}
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fn visit_string<E>(self, value: String) -> Result<Self::Value, E> where E: Error {
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self.visit_str(value.as_ref())
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}
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}
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#[cfg(test)]
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mod test {
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use serde_json;
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use util::U256;
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use uint::Uint;
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#[test]
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fn uint_deserialization() {
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let s = r#"["0xa", "10", "", "0x", 0]"#;
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let deserialized: Vec<Uint> = serde_json::from_str(s).unwrap();
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assert_eq!(deserialized, vec![
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Uint(U256::from(10)),
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Uint(U256::from(10)),
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Uint(U256::from(0)),
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Uint(U256::from(0)),
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Uint(U256::from(0))
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]);
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}
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#[test]
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fn uint_into() {
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assert_eq!(U256::from(10), Uint(U256::from(10)).into());
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}
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}
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