// Charlemagne Package Manager
//
// Douglas Thrift
//
// $Id$

/* Menes - C++ High-Level Utility Library
 * Copyright (C) 2003-2005  Jay Freeman (saurik)
*/

/*
 *        Redistribution and use in source and binary
 * forms, with or without modification, are permitted
 * provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the
 *    above copyright notice, this list of conditions
 *    and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the
 *    above copyright notice, this list of conditions
 *    and the following disclaimer in the documentation
 *    and/or other materials provided with the
 *    distribution.
 * 3. The name of the author may not be used to endorse
 *    or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <cassert>
#include <sstream>

#include "regex.hpp"

#undef _assert
#define _assert(b) assert(b)

namespace Pcre
{

Error::Error(int code)
{
	std::ostringstream message;

	message << "Pcre[#" << code << "] ";

	switch (code)
	{
	case PCRE_ERROR_NOMATCH:
		message << "PCRE_ERROR_NOMATCH";

		break;

	case PCRE_ERROR_NULL:
		message << "PCRE_ERROR_NULL";

		break;

	case PCRE_ERROR_BADOPTION:
		message << "PCRE_ERROR_BADOPTION";

		break;

	case PCRE_ERROR_BADMAGIC:
		message << "PCRE_ERROR_BADMAGIC";

		break;

	case PCRE_ERROR_UNKNOWN_NODE:
		message << "PCRE_ERROR_UNKNOWN_NODE";

		break;

	case PCRE_ERROR_NOMEMORY:
		message << "PCRE_ERROR_NOMEMORY";

		break;

	case PCRE_ERROR_NOSUBSTRING:
		message << "PCRE_ERROR_NOSUBSTRING";

		break;

	case PCRE_ERROR_MATCHLIMIT:
		message << "PCRE_ERROR_MATCHLIMIT";

		break;

	case PCRE_ERROR_CALLOUT:
		message << "PCRE_ERROR_CALLOUT";

		break;
	case PCRE_ERROR_BADUTF8:
		message << "PCRE_ERROR_BADUTF8";

		break;

	case PCRE_ERROR_BADUTF8_OFFSET:
		message << "PCRE_ERROR_BADUTF8_OFFSET";

		break;

	default:
		message << "Unknown Error";
	}

	this->message = message.str();
}

RegEx::Match::Match(const std::string &data, std::vector<int> &substrings) : data(data)
{
	std::swap(this->substrings, substrings);
}

RegEx::Match::Match() {}

RegEx::Match::operator bool() const
{
	return !substrings.empty();
}

std::string RegEx::Match::operator [](size_t substring) const
{
	size_t index(substring * 2);

	if (index >= substrings.size())
		return std::string();

	return std::string(data.begin() + substrings[index], data.begin() + substrings[index + 1]);
}

RegEx::RegEx(const std::string &pattern) : code(NULL), study(NULL), capture(-1)
{
	const char *error;
	int offset;

	code = ::pcre_compile(pattern.c_str(), PCRE_DOTALL | PCRE_DOLLAR_ENDONLY, &error, &offset, NULL);

	int err(::pcre_fullinfo(code, study, PCRE_INFO_CAPTURECOUNT, &capture));

	if (err != 0)
	{
		_assert(err < 0);

		throw Error(err);
	}

	_assert(capture >= 0);
}

RegEx::~RegEx()
{
	::pcre_free(code);
}

RegEx::Match RegEx::operator ()(const std::string &data) const
{
	std::vector<int> substrings((capture + 1) * 3);
	int err(::pcre_exec(code, study, data.c_str(), data.size(), 0, 0, &substrings.front(), substrings.size()));

	_assert(err != 0);

	if (err == PCRE_ERROR_NOMATCH)
		err = 0;

	if (err < 0)
		throw Error(err);

	substrings.resize(err * 2);

	return Match(data, substrings);
}

}