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/// Copyright 2013 Daniel Parker
// Distributed under the Boost license, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
// See https://github.com/danielaparker/jsoncons for latest version
#ifndef JSONCONS_PARSE_ERROR_HANDLER_HPP
#define JSONCONS_PARSE_ERROR_HANDLER_HPP
#include "jsoncons/jsoncons.hpp"
#include <system_error>
namespace jsoncons {
class parse_exception : public std::exception, public virtual json_exception
{
public:
parse_exception(std::error_code ec,
size_t line,
size_t column)
: error_code_(ec),
line_number_(line),
column_number_(column)
{
}
parse_exception(const parse_exception& other)
: error_code_(other.error_code_),
line_number_(other.line_number_),
column_number_(other.column_number_)
{
}
const char* what() const JSONCONS_NOEXCEPT
{
std::ostringstream os;
os << error_code_.message() << " at line " << line_number_ << " and column " << column_number_;
const_cast<std::string&>(buffer_) = os.str();
return buffer_.c_str();
}
const std::error_code code() const
{
return error_code_;
}
size_t line_number() const
{
return line_number_;
}
size_t column_number() const
{
return column_number_;
}
private:
std::error_code error_code_;
std::string buffer_;
size_t line_number_;
size_t column_number_;
};
typedef parse_exception json_parse_exception;
template<typename CharT>
class basic_parsing_context
{
public:
virtual ~basic_parsing_context() {}
size_t line_number() const
{
return do_line_number();
}
size_t column_number() const
{
return do_column_number();
}
CharT current_char() const
{
return do_current_char();
}
#if !defined(JSONCONS_NO_DEPRECATED)
CharT last_char() const
{
return do_current_char();
}
#endif
private:
virtual size_t do_line_number() const = 0;
virtual size_t do_column_number() const = 0;
virtual CharT do_current_char() const = 0;
};
typedef basic_parsing_context<char> parsing_context;
typedef basic_parsing_context<wchar_t> wparsing_context;
template <typename CharT>
class basic_parse_error_handler
{
public:
virtual ~basic_parse_error_handler()
{
}
void warning(std::error_code ec,
const basic_parsing_context<CharT>& context) throw (parse_exception)
{
do_warning(ec,context);
}
void error(std::error_code ec,
const basic_parsing_context<CharT>& context) throw (parse_exception)
{
do_error(ec,context);
}
void fatal_error(std::error_code ec,
const basic_parsing_context<CharT>& context) throw (parse_exception)
{
do_fatal_error(ec,context);
throw parse_exception(ec,context.line_number(),context.column_number());
}
private:
virtual void do_warning(std::error_code,
const basic_parsing_context<CharT>& context) throw (parse_exception) = 0;
virtual void do_error(std::error_code,
const basic_parsing_context<CharT>& context) throw (parse_exception) = 0;
virtual void do_fatal_error(std::error_code,
const basic_parsing_context<CharT>& context) throw (parse_exception)
{
(void)context;
}
};
template <typename CharT>
class basic_default_parse_error_handler : public basic_parse_error_handler<CharT>
{
public:
static basic_parse_error_handler<CharT>& instance()
{
static basic_default_parse_error_handler<CharT> instance;
return instance;
}
private:
virtual void do_warning(std::error_code,
const basic_parsing_context<CharT>& context) throw (parse_exception)
{
(void)context;
}
virtual void do_error(std::error_code ec,
const basic_parsing_context<CharT>& context) throw (parse_exception)
{
throw parse_exception(ec,context.line_number(),context.column_number());
}
};
typedef basic_parse_error_handler<char> parse_error_handler;
typedef basic_parse_error_handler<wchar_t> wparse_error_handler;
typedef basic_default_parse_error_handler<char> default_parse_error_handler;
typedef basic_default_parse_error_handler<wchar_t> wdefault_parse_error_handler;
typedef basic_parsing_context<char> parsing_context;
typedef basic_parsing_context<wchar_t> wparsing_context;
}
#endif
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