73 lines
2.0 KiB
Rust
73 lines
2.0 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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use std::fmt;
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use serde::{Deserialize, Deserializer};
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use serde::de::{Error, Visitor};
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/// Represents usize.
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#[derive(Debug, PartialEq)]
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pub struct Index(usize);
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impl Index {
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/// Convert to usize
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pub fn value(&self) -> usize {
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self.0
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}
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}
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impl Deserialize for Index {
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fn deserialize<D>(deserializer: D) -> Result<Index, D::Error>
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where D: Deserializer {
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deserializer.deserialize(IndexVisitor)
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}
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}
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struct IndexVisitor;
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impl Visitor for IndexVisitor {
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type Value = Index;
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fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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write!(formatter, "a hex-encoded or decimal index")
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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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match value {
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_ if value.starts_with("0x") => usize::from_str_radix(&value[2..], 16).map(Index).map_err(|_| Error::custom("invalid index")),
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_ => value.parse::<usize>().map(Index).map_err(|_| Error::custom("invalid index")),
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}
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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 tests {
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use super::*;
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use serde_json;
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#[test]
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fn block_number_deserialization() {
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let s = r#"["0xa", "10"]"#;
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let deserialized: Vec<Index> = serde_json::from_str(s).unwrap();
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assert_eq!(deserialized, vec![Index(10), Index(10)]);
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}
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}
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