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/***************************************************************************
* Copyright (C) 2017-2018 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 INTERVALS_H
#define INTERVALS_H
#include <vector>
#include <string>
/* This file implements a interval container that supports insertion and
* inclusion tests for integer intervals.
*
* Used for the --page-range feature
*/
struct Interval {
/* from and to are inclusive. */
Interval(int from, int to) {
this->from = from;
this->to = to;
}
int from;
int to;
inline bool contains(int element) const {
return element >= from && element <= to;
}
};
class IntervalContainer {
public:
IntervalContainer() {}
/** Parses a string into intervals.
*
* This accepts the format used for the --page-range option: A comma
* separated list of intervals, which can be either a single integer or
* two integers separated by a minus character. Whitespace is not
* allowed.
*
* More precisely, the following grammar is implemented:
*
* INTERVALS ::= 𝝴 | INTERVAL ',' INTERVALS
* INTERVAL ::= int | int '-' int
*
*/
static IntervalContainer fromString(const std::string str);
void addInterval(Interval i);
/** Returns true if either the element is contained in any interval or
* this container is empty.
*
* The latter case is there to simplify --page-range. If no intervals
* are specified, we want to search every page.
*/
bool contains(int element) const;
private:
std::vector<Interval> intervals;
};
#endif /* INTERVALS_H */
/* Local Variables: */
/* mode: c++ */
/* End: */
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