84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2015 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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// mapnik
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#include <mapnik/util/dasharray_parser.hpp>
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#pragma GCC diagnostic push
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#include <mapnik/warning_ignore.hpp>
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#include <boost/spirit/home/x3.hpp>
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#pragma GCC diagnostic pop
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namespace mapnik {
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namespace util {
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namespace {
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inline bool setup_dashes(std::vector<double> & buf, dash_array & dash)
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{
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if (buf.empty()) return false;
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size_t size = buf.size();
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if (size % 2 == 1)
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{
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buf.insert(buf.end(),buf.begin(),buf.end());
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}
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std::vector<double>::const_iterator pos = buf.begin();
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while (pos != buf.end())
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{
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if (*pos > 0.0 || *(pos+1) > 0.0) // avoid both dash and gap eq 0.0
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{
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dash.emplace_back(*pos,*(pos + 1));
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}
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pos +=2;
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}
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return !buf.empty();
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}
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}
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bool parse_dasharray(std::string const& value, dash_array & dash)
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{
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using namespace boost::spirit;
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using x3::no_skip;
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using x3::double_;
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using x3::char_;
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boost::spirit::x3::ascii::space_type space;
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// SVG
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// dasharray ::= (length | percentage) (comma-wsp dasharray)?
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// no support for 'percentage' as viewport is unknown at load_map
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//
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std::vector<double> buf;
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auto first = value.begin();
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auto last = value.end();
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bool r = x3::phrase_parse(first, last,
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(double_ % no_skip[char_(", ")] | "none"),
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space, buf);
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if (r && first == last)
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{
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return setup_dashes(buf, dash);
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}
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return false;
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}
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} // end namespace util
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} // end namespace mapnik
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