// The Construct
//
// Copyright (C) The Construct Developers, Authors & Contributors
// Copyright (C) 2016-2020 Jason Volk <jason@zemos.net>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice is present in all copies. The
// full license for this software is available in the LICENSE file.

#pragma once
#define HAVE_IRCD_SPIRIT_EXPECTATION_FAILURE_H

namespace ircd {
namespace spirit
__attribute__((visibility("default")))
{
	template<class parent_error> struct expectation_failure;

	// parse.cc
	extern thread_local char rule_buffer[64];
}}

template<class parent_error>
struct __attribute__((visibility("default")))
ircd::spirit::expectation_failure
:parent_error
{
	template<class it = const char *>
	expectation_failure(const qi::expectation_failure<it> &e,
	                    const ssize_t &show_max = 64);

	template<class it = const char *>
	expectation_failure(const qi::expectation_failure<it> &e,
	                    const it &start,
	                    const ssize_t &show_max = 64);
};

template<class parent>
template<class it>
ircd::spirit::expectation_failure<parent>::expectation_failure(const qi::expectation_failure<it> &e,
		                                                       const ssize_t &show_max)
:parent
{
	"Expected %s. You input %zd invalid characters :%s",
	ircd::string(rule_buffer, e.what_),
	std::distance(e.first, e.last),
	string_view{e.first, e.first + std::min(std::distance(e.first, e.last), show_max)}
}
{}

template<class parent>
template<class it>
ircd::spirit::expectation_failure<parent>::expectation_failure(const qi::expectation_failure<it> &e,
                                                               const it &start,
		                                                       const ssize_t &show_max)
:parent
{
	"Expected %s. You input %zd invalid characters somewhere between position %zd and %zd :%s",
	ircd::string(rule_buffer, e.what_),
	std::distance(e.first, e.last),
	std::distance(start, e.first),
	std::distance(start, e.last),
	string_view{e.first, e.first + std::min(std::distance(e.first, e.last), show_max)}
}
{}