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dasharray_parser.cpp
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82 lines (74 loc) · 2.43 KB
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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2025 Artem Pavlenko
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
// mapnik
#include <mapnik/util/dasharray_parser.hpp>
#include <mapnik/warning.hpp>
MAPNIK_DISABLE_WARNING_PUSH
#include <mapnik/warning_ignore.hpp>
#include <boost/spirit/home/x3.hpp>
MAPNIK_DISABLE_WARNING_POP
namespace mapnik {
namespace util {
namespace {
inline bool setup_dashes(std::vector<double>& buf, dash_array& dash)
{
if (buf.empty())
return false;
size_t size = buf.size();
if (size % 2 == 1)
{
buf.insert(buf.end(), buf.begin(), buf.end());
}
std::vector<double>::const_iterator pos = buf.begin();
while (pos != buf.end())
{
if (*pos > 0.0 || *(pos + 1) > 0.0) // avoid both dash and gap eq 0.0
{
dash.emplace_back(*pos, *(pos + 1));
}
pos += 2;
}
return !buf.empty();
}
} // namespace
bool parse_dasharray(std::string const& value, dash_array& dash)
{
using namespace boost::spirit;
using x3::char_;
using x3::double_;
boost::spirit::x3::ascii::space_type space;
// SVG
// dasharray ::= (length | percentage) (comma-wsp dasharray)?
// no support for 'percentage' as viewport is unknown at load_map
//
std::vector<double> buf;
auto first = value.begin();
auto last = value.end();
bool r = x3::phrase_parse(first, last, (double_ % -char_(',') | "none"), space, buf);
if (r && first == last)
{
return setup_dashes(buf, dash);
}
return false;
}
} // end namespace util
} // end namespace mapnik