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/***************************************************************************
* Copyright (C) 2015-2023 by Hans-Peter Deifel *
* hpd@hpdeifel.de *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, *
* Boston, MA 02110-1301 USA. *
***************************************************************************/
#ifndef REGENGINE_H
#define REGENGINE_H
#include "config.h"
#include <stdlib.h>
#include <sys/types.h>
#include <regex.h>
#ifdef HAVE_LIBPCRE
#define PCRE2_CODE_UNIT_WIDTH 8
#include <pcre2.h>
#endif
#include <vector>
#include <string>
#include <memory>
struct match;
class Regengine
{
public:
// writes the match data to m. Returns true on success and false on failure
virtual bool exec(const std::string &str, size_t offset, struct match &m) const = 0;
virtual ~Regengine() {}
};
// This matches the union of a set of patterns
//
// It just tries all patterns in turn. This could be more efficient by using
// some engine-specific way of combining patterns, e.g with "|" in the posix
// case.
class PatternList : public Regengine
{
public:
PatternList() {}
~PatternList() {}
bool exec(const std::string &str, size_t offset, struct match &m) const override;
void add_pattern(std::unique_ptr<Regengine> pattern);
private:
std::vector<std::unique_ptr<Regengine>> patterns;
};
class PosixRegex : public Regengine
{
public:
PosixRegex(const std::string &pattern, bool case_insensitive);
~PosixRegex();
bool exec(const std::string &str, size_t offset, struct match &m) const override;
private:
regex_t regex;
};
#ifdef HAVE_LIBPCRE
class PCRERegex : public Regengine
{
public:
PCRERegex(const std::string &pattern, bool case_insensitive);
~PCRERegex();
bool exec(const std::string &str, size_t offset, struct match &m) const override;
private:
pcre2_code *regex;
};
#endif
class FixedString : public Regengine
{
public:
FixedString(const std::string &pattern, bool case_insensitive);
bool exec(const std::string &str, size_t offset, struct match &m) const override;
private:
std::vector<std::string> patterns;
bool case_insensitive;
};
#endif /* REGENGINE_H */
/* Local Variables: */
/* mode: c++ */
/* End: */
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