//

// Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com)

// Copyright (c) 2020 Paul Dreik (github@pauldreik.se)

//

// Distributed under the Boost Software License, Version 1.0. (See accompanying

// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

//

// Official repository: https://github.com/boostorg/json

//

// This file must be manually included when

// using basic_parser to implement a parser.

#include <boost/json/basic_parser_impl.hpp>

#include <iomanip>

#include <iostream>

using namespace boost::json;

class null_parser

{

    struct handler

    {

        constexpr static std::size_t max_object_size = std::size_t(-1);

        constexpr static std::size_t max_array_size = std::size_t(-1);

        constexpr static std::size_t max_key_size = std::size_t(-1);

        constexpr static std::size_t max_string_size = std::size_t(-1);

        bool on_document_begin( boost::system::error_code& ) { return true; }

        bool on_document_end( boost::system::error_code& ) { return true; }

        bool on_object_begin( boost::system::error_code& ) { return true; }

        bool on_object_end( std::size_t, boost::system::error_code& ) { return true; }

        bool on_array_begin( boost::system::error_code& ) { return true; }

        bool on_array_end( std::size_t, boost::system::error_code& ) { return true; }

        bool on_key_part( string_view, std::size_t, boost::system::error_code& ) { return true; }

        bool on_key( string_view, std::size_t, boost::system::error_code& ) { return true; }

        bool on_string_part( string_view, std::size_t, boost::system::error_code& ) { return true; }

        bool on_string( string_view, std::size_t, boost::system::error_code& ) { return true; }

        bool on_number_part( string_view, boost::system::error_code& ) { return true; }

        bool on_int64( std::int64_t, string_view, boost::system::error_code& ) { return true; }

        bool on_uint64( std::uint64_t, string_view, boost::system::error_code& ) { return true; }

        bool on_double( double, string_view, boost::system::error_code& ) { return true; }

        bool on_bool( bool, boost::system::error_code& ) { return true; }

        bool on_null( boost::system::error_code& ) { return true; }

        bool on_comment_part(string_view, boost::system::error_code&) { return true; }

        bool on_comment(string_view, boost::system::error_code&) { return true; }

    };

    basic_parser<handler> p_;

public:

    null_parser()

        : p_(parse_options())

    {

    }

    ~null_parser()

    {

    }

    std::size_t

    write(

        char const* data,

        std::size_t size,

        boost::system::error_code& ec)

    {

        auto const n = p_.write_some( false, data, size, ec );

        if(! ec && n < size)

            ec = error::extra_data;

        return n;

    }

};

bool

validate( string_view s )

{

    // Parse with the null parser and return false on error

    null_parser p;

    boost::system::error_code ec;

    p.write( s.data(), s.size(), ec );

    if( ec )

        return false;

    // The string is valid JSON.

    return true;

}

extern "C"

int

LLVMFuzzerTestOneInput(

    const uint8_t* data, size_t size)

{

    try

    {

        validate(string_view{

            reinterpret_cast<const char*

                >(data), size});

    }

    catch(...)

    {

    }

    return 0;

}