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    // Copyright 2015-2017 Parity Technologies (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/>.

    //! Coversion from json.

    use standard::*;
    use bigint::prelude::*;

    #[macro_export]
    macro_rules! xjson {
    	( $x:expr ) => {
    		FromJson::from_json($x)
    	}
    }

    /// Trait allowing conversion from a JSON value.
    pub trait FromJson {
    	/// Convert a JSON value to an instance of this type.
    	fn from_json(json: &Json) -> Self;
    }

    impl FromJson for U256 {
    	fn from_json(json: &Json) -> Self {
    		match *json {
    			Json::String(ref s) => {
    				if s.len() >= 2 && &s[0..2] == "0x" {
    					FromStr::from_str(&s[2..]).unwrap_or_else(|_| Default::default())
    				} else {
    					Uint::from_dec_str(s).unwrap_or_else(|_| Default::default())
    				}
    			},
    			Json::U64(u) => From::from(u),
    			Json::I64(i) => From::from(i as u64),
    			_ => Uint::zero(),
    		}
    	}
    }

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