/*
 * Copyright 2007-2018 Content Management AG
 * All rights reserved.
 *
 * author: Max Kellermann <mk@cm4all.com>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * - 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``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
 * FOUNDATION OR CONTRIBUTORS 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.
 */

#ifndef REGEX_POINTER_HXX
#define REGEX_POINTER_HXX

#include "util/StringView.hxx"
#include "util/Compiler.h"

#include <pcre.h>

#include <array>

#if GCC_CHECK_VERSION(11,0)
#pragma GCC diagnostic push
/* bogus GCC 11 warning "ovector may be used uninitialized" in the
   ovector.size() call */
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif

class RegexPointer {
protected:
	pcre *re = nullptr;
	pcre_extra *extra = nullptr;

	unsigned n_capture = 0;

public:
	constexpr bool IsDefined() const noexcept {
		return re != nullptr;
	}

	[[gnu::pure]]
	bool Match(StringView s) const noexcept {
		/* we don't need the data written to ovector, but PCRE can
		   omit internal allocations if we pass a buffer to
		   pcre_exec() */
		std::array<int, 16> ovector;
		return pcre_exec(re, extra, s.data, s.size,
				 0, 0, &ovector.front(), ovector.size()) >= 0;
	}
};

#if GCC_CHECK_VERSION(11,0)
#pragma GCC diagnostic pop
#endif

#endif
