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| | /* regex-fields.h - xapian glue for semi-bruteforce regexp search
*
* This file is part of notmuch.
*
* Copyright © 2015 Austin Clements
* Copyright © 2016 David Bremner
*
* 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 3 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, see https://www.gnu.org/licenses/ .
*
* Author: Austin Clements <aclements@csail.mit.edu>
* David Bremner <david@tethera.net>
*/
#ifndef NOTMUCH_REGEXP_FIELDS_H
#define NOTMUCH_REGEXP_FIELDS_H
#if HAVE_XAPIAN_FIELD_PROCESSOR
#include <sys/types.h>
#include <regex.h>
#include <xapian.h>
#include "notmuch-private.h"
/* A posting source that returns documents where a value matches a
* regexp.
*/
class RegexpPostingSource : public Xapian::PostingSource
{
protected:
const Xapian::valueno slot_;
regex_t regexp_;
Xapian::Database db_;
bool started_;
Xapian::ValueIterator it_, end_;
/* No copying */
RegexpPostingSource (const RegexpPostingSource &);
RegexpPostingSource &operator= (const RegexpPostingSource &);
public:
RegexpPostingSource (Xapian::valueno slot, const std::string ®exp);
~RegexpPostingSource ();
void init (const Xapian::Database &db);
Xapian::doccount get_termfreq_min () const;
Xapian::doccount get_termfreq_est () const;
Xapian::doccount get_termfreq_max () const;
Xapian::docid get_docid () const;
bool at_end () const;
void next (unused (double min_wt));
};
class RegexpFieldProcessor : public Xapian::FieldProcessor {
protected:
Xapian::QueryParser &parser;
notmuch_database_t *notmuch;
RegexpPostingSource *postings = NULL;
public:
RegexpFieldProcessor (Xapian::QueryParser &parser_, notmuch_database_t *notmuch_)
: parser(parser_), notmuch(notmuch_) { };
~RegexpFieldProcessor () { delete postings; };
Xapian::Query operator()(const std::string & str);
};
#endif
#endif /* NOTMUCH_REGEXP_FIELDS_H */
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