CommonJS.h

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/*
    This file is part of cpp-ethereum.
 
    cpp-ethereum 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.
 
    cpp-ethereum 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 cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
*/
 
#pragma once
 
#include "CommonData.h"
#include "CommonIO.h"
#include "FixedHash.h"
 
#include <string>
 
namespace dev
{
inline std::string toJS(byte _b)
{
    return "0x" + std::to_string(_b);
}
 
template <unsigned S> std::string toJS(FixedHash<S> const& _h)
{
    return toHexPrefixed(_h.ref());
}
 
template <unsigned N> std::string toJS(boost::multiprecision::number<boost::multiprecision::cpp_int_backend<N, N, boost::multiprecision::unsigned_magnitude, boost::multiprecision::unchecked, void>> const& _n)
{
    std::string h = toHex(toCompactBigEndian(_n, 1));
    // remove first 0, if it is necessary;
    std::string res = h[0] != '0' ? h : h.substr(1);
    return "0x" + res;
}
 
inline std::string toJS(bytes const& _n, std::size_t _padding = 0)
{
    if (_n.empty())
        return {};
 
    bytes n = _n;
    n.resize(std::max<unsigned>(n.size(), _padding));
    return toHexPrefixed(n);
}
 
template<unsigned T> std::string toJS(SecureFixedHash<T> const& _i)
{
    std::stringstream stream;
    stream << "0x" << _i.makeInsecure().hex();
    return stream.str();
}
 
template<typename T> std::string toJS(T const& _i)
{
    std::stringstream stream;
    stream << "0x" << std::hex << _i;
    return stream.str();
}
 
enum class OnFailed { InterpretRaw, Empty, Throw };
 
bytes jsToBytes(std::string const& _s, OnFailed _f = OnFailed::Empty);
bytes padded(bytes _b, unsigned _l);
bytes paddedRight(bytes _b, unsigned _l);
bytes unpadded(bytes _s);
bytes unpadLeft(bytes _s);
std::string fromRaw(h256 _n);
 
template <unsigned N> FixedHash<N> jsToFixed(std::string const& _s)
{
    if (_s.substr(0, 2) == "0x")
        // Hex
        return FixedHash<N>(_s.substr(2 + std::max<unsigned>(N * 2, _s.size() - 2) - N * 2));
    else if (_s.find_first_not_of("0123456789") == std::string::npos)
        // Decimal
        return (typename FixedHash<N>::Arith)(_s);
    else
        // Binary
        return FixedHash<N>();  // FAIL
}
 
template <unsigned N> boost::multiprecision::number<boost::multiprecision::cpp_int_backend<N * 8, N * 8, boost::multiprecision::unsigned_magnitude, boost::multiprecision::unchecked, void>> jsToInt(std::string const& _s)
{
    if (_s.substr(0, 2) == "0x")
        // Hex
        return fromBigEndian<boost::multiprecision::number<boost::multiprecision::cpp_int_backend<N * 8, N * 8, boost::multiprecision::unsigned_magnitude, boost::multiprecision::unchecked, void>>>(fromHex(_s.substr(2)));
    else if (_s.find_first_not_of("0123456789") == std::string::npos)
        // Decimal
        return boost::multiprecision::number<boost::multiprecision::cpp_int_backend<N * 8, N * 8, boost::multiprecision::unsigned_magnitude, boost::multiprecision::unchecked, void>>(_s);
    else
        // Binary
        return 0;           // FAIL
}
 
inline u256 jsToU256(std::string const& _s) { return jsToInt<32>(_s); }
 
inline int jsToInt(std::string const& _s)
{
    int ret = 0;
    DEV_IGNORE_EXCEPTIONS(ret = std::stoi(_s, nullptr, 0));
    return ret;
}
 
inline std::string jsToDecimal(std::string const& _s)
{
    return toString(jsToU256(_s));
}
 
}