51 lines
1.4 KiB
Rust
51 lines
1.4 KiB
Rust
// Copyright 2015, 2016 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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//! Coversion from json.
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use standard::*;
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use bigint::prelude::*;
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#[macro_export]
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macro_rules! xjson {
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( $x:expr ) => {
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FromJson::from_json($x)
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}
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}
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/// Trait allowing conversion from a JSON value.
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pub trait FromJson {
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/// Convert a JSON value to an instance of this type.
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fn from_json(json: &Json) -> Self;
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}
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impl FromJson for U256 {
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fn from_json(json: &Json) -> Self {
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match *json {
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Json::String(ref s) => {
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if s.len() >= 2 && &s[0..2] == "0x" {
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FromStr::from_str(&s[2..]).unwrap_or_else(|_| Default::default())
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} else {
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Uint::from_dec_str(s).unwrap_or_else(|_| Default::default())
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}
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},
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Json::U64(u) => From::from(u),
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Json::I64(i) => From::from(i as u64),
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_ => Uint::zero(),
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}
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}
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}
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