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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Parse a string containing number ranges.
*
* Copyright (C) 2022 Martin Owens
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#ifndef INKSCAPE_UTIL_PARSE_INT_RANGE_H
#define INKSCAPE_UTIL_PARSE_INT_RANGE_H
#include <regex>
#include <string>
#include <set>
namespace Inkscape {
/**
* Parse integer ranges out of a string using regex.
*
* @param input - A string containing number ranges that can either be comma
* separated or dash separated for non and continuous ranges.
* @param start - Optional first number in the acceptable range.
* @param end - The last number in the acceptable range.
*
* @returns a sorted set of unique numbers.
*/
inline std::set<unsigned int> parseIntRange(const std::string &input, unsigned int start=1, unsigned int end=0)
{
// Special word based translations go here:
if (input == "all") {
return parseIntRange("-", start, end);
}
std::set<unsigned int> out;
auto add = [=](std::set<unsigned int> &to, unsigned int val) {
if (start <= val && (!end || val <= end))
to.insert(val);
};
std::regex re("((\\d+|)\\s?(-)\\s?(\\d+|)|,?(\\d+)([^-]|$))");
std::string::const_iterator sit = input.cbegin(), fit = input.cend();
for (std::smatch match; std::regex_search(sit, fit, match, re); sit = match[0].second)
{
if (match.str(3) == "") {
add(out, std::stoul(match.str(5)));
} else {
auto r1 = match.str(2).empty() ? start : std::stoul(match.str(2));
auto r2 = match.str(4).empty() ? (end ? end : r1) : std::stoul(match.str(4));
for (auto i = std::min(r1, r2); i <= std::max(r1, r2); i++) {
add(out, i);
}
}
}
return out;
}
} // namespace Inkscape
#endif
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
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