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 <string>
#include "FixedHash.h"
#include "CommonData.h"
#include "CommonIO.h"

namespace dev
{

template <unsigned S> std::string toJS(FixedHash<S> const& _h)
{
        return "0x" + toHex(_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)
{
        bytes n = _n;
        n.resize(std::max<unsigned>(n.size(), _padding));
        return "0x" + toHex(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));
}

}